CN113090208A

CN113090208A - Horizontal well sand removal pipe column device and sand removal method

Info

Publication number: CN113090208A
Application number: CN201911336849.5A
Authority: CN
Inventors: 陈伟东; 杨波; 边荣军; 贾海舰; 何远哲; 王冠贺; 袁勇; 程斌; 李贺龙; 张朋娟
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2021-07-09
Anticipated expiration: 2039-12-23
Also published as: CN113090208B

Abstract

The invention relates to a horizontal well sand removal pipe column device and a sand removal method, wherein the horizontal well sand removal pipe column device comprises a sand-liquid mixing assembly, a screw pump assembly, a sand filtering assembly and a driving motor, wherein the sand-liquid mixing assembly extends into a horizontal production section, and the sand-liquid mixing assembly, the screw pump assembly, the sand filtering assembly and the driving motor are sequentially connected; a stirring shaft and stirring blades are arranged in the sand-liquid mixing assembly, a screw pump rotor is arranged in the screw pump assembly, a connecting long shaft is arranged in the sand filtering assembly, one end of the stirring shaft is connected with one end of the screw pump rotor, the other end of the screw pump rotor is connected with one end of the connecting long shaft through a first universal coupling, the other end of the connecting long shaft is connected with a motor shaft of a driving motor through a second universal coupling, and the motor shaft is connected with an oil pipe; and infusion passages communicated with each other are formed inside the sand-liquid mixing assembly, the screw pump assembly and the sand filtering assembly. The invention solves the technical problems of high sand removal cost, long time consumption and poor effect in the horizontal production section.

Description

Horizontal well sand removal pipe column device and sand removal method

Technical Field

The invention relates to the technical field of petroleum engineering, in particular to a horizontal well sand removal pipe column device and a sand removal method.

Background

The horizontal oil well technology is applied in oil field development on a large scale, with the prolonging of the production time of a horizontal well, formation sand flows out along with crude oil and enters a shaft of the horizontal well, part of the formation sand can be deposited at the bottom of a horizontal production section of the horizontal well, so that the bottom of the horizontal production section is blocked, the seepage flow of the oil in an oil layer at the lower part of the horizontal production section into the shaft is blocked, the development effect of the horizontal well is seriously influenced, and meanwhile, the pump clamping fault of an oil well can be caused, so that the oil well can not normally produce.

At present, the method for treating the sand surface is to carry out 'hydraulic sand washing' operation workover construction, wherein the 'hydraulic sand washing' workover construction is to put an oil well sand washing construction pipe column into a shaft, the pipe column is formed by putting an oil pipe with a pen point according to the position of the sand surface, and the ground part is formed by an operating machine, a hose line for connecting the oil pipe, a sand setting water tank and a cement truck. During sand washing construction, a cement truck pumps water into the pipe column, the water flows to the pen point position through the oil pipe and is shot to the sand surface, and after the upward lifting pressure is held down at the bottom of the well through continuously pumping water to the bottom of the well, sand liquid is lifted to the ground through the annular space of the oil well casing and flows back to the sand setting water tank. The sand surface descends, the operating machine lowers the oil pipes to follow the sand surface, when one oil pipe is placed to the bottom, the cement truck stops pumping, sand washing is suspended, a hose line connected to the oil pipe is detached, sand washing construction is continued after the other oil pipe is connected, and sand is cleaned to the ground through circulation.

However, the sand removing device and the sand removing method have the following defects:

firstly, a large amount of water needs to be pumped into the well when the pressure of the upward lifting is suppressed at the bottom of the well, and most of water leaks into an oil layer due to the serious shortage of an oil production stratum, so that the oil layer is polluted and the oil layer is further damaged, and the development effect of the oil well is influenced;

secondly, because sand exists at the lower part of the horizontal production section under the action of gravity, the states of lower half sand setting and upper half fluid flow can be presented in the horizontal production section, and the sand setting in the horizontal production section cannot be thoroughly removed by the conventional hydraulic sand washing device and the conventional sand washing process;

thirdly, the hydraulic sand washing consumes long time, and the labor and cost are high;

fourthly, water resources are wasted;

and fifthly, because the sand washing liquid leaks to the oil layer, a part of sand flows back to the stratum, and the sand washing effect is poor.

Aiming at the problems of high sand removal cost, long time consumption and poor effect in the horizontal production section in the related technology, no effective solution is provided at present.

Therefore, the inventor provides a horizontal well sand removal pipe column device and a sand removal method by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.

Disclosure of Invention

The invention aims to provide a horizontal well sand removal pipe column device and a sand removal method, which can thoroughly change the pollution and damage of the traditional hydraulic sand washing liquid to the stratum, shorten the oil well occupation time of an oil well due to hydraulic sand washing construction, reduce the construction workload, improve the efficiency, reduce the labor intensity of workers, ensure the smooth development of a horizontal oil well, and solve the problem that the settled sand in the horizontal production section of the horizontal well cannot be thoroughly removed.

The purpose of the invention can be realized by adopting the following technical scheme:

the invention provides a horizontal well sand removal pipe column device which is connected to the bottom of an oil pipe and extends into an oil well casing of a horizontal well along with the oil pipe, wherein the horizontal well sand removal pipe column device comprises a sand-liquid mixing assembly for stirring and mixing sand liquid, a screw pump assembly for driving the sand-liquid mixing assembly to rotate and providing suction force for the mixed sand liquid, a sand filtering assembly for filtering sand liquid and a driving motor for providing power for the rotation of the screw pump assembly, wherein:

the sand-liquid mixing assembly extends into a horizontal production section in the horizontal well, and the sand-liquid mixing assembly, the screw pump assembly, the sand filtering assembly and the driving motor are sequentially connected from the horizontal production section to a wellhead direction;

a stirring shaft and a stirring blade arranged on the stirring shaft are arranged inside the sand-liquid mixing assembly, a screw pump rotor is arranged inside the screw pump assembly, a connecting long shaft penetrating through the sand filtering assembly is arranged inside the sand filtering assembly, one end of the stirring shaft is connected with one end of the screw pump rotor, the other end of the screw pump rotor is connected with one end of the connecting long shaft through a first universal coupling, the other end of the connecting long shaft is connected with a motor shaft of the driving motor through a second universal coupling, and the motor is connected with the oil pipe;

and infusion passages communicated with each other are formed in the sand-liquid mixing assembly, the screw pump assembly and the sand filtering assembly, so that the sand liquid mixed by the sand-liquid mixing assembly flows into the sand filtering assembly through the infusion passages.

In a preferred embodiment of the present invention, the sand-liquid mixing assembly further includes a first accommodating cylinder, the first accommodating cylinder has a cylindrical structure with two open ends, the paddle shaft is disposed in the first accommodating cylinder along a length direction of the first accommodating cylinder, the paddle blade is disposed on an outer wall of the paddle shaft, a plurality of circulation holes are uniformly disposed on an outer wall of the first accommodating cylinder opposite to the paddle blade along a circumferential direction of the first accommodating cylinder, and the first accommodating cylinder away from one end of each circulation hole is connected to the screw pump assembly.

In a preferred embodiment of the present invention, a first receiving groove is formed in an end surface of the paddle shaft away from the paddle blade, a first buffer block is embedded in the first receiving groove, a nut for stabilizing the paddle blade is screwed to an end of the paddle shaft close to the paddle blade, and the nut abuts against the paddle blade.

In a preferred embodiment of the present invention, a first boss is disposed on one end of the paddle shaft away from the paddle blades along a circumferential direction of the paddle shaft, a first fixing ring is sleeved on an outer side of the paddle shaft between the first boss and the paddle blades, the first fixing ring is fixedly connected to the first accommodating cylinder, a plurality of first liquid passing holes are reserved between an outer wall of the first fixing ring and an inner wall of the first accommodating cylinder, and a first bearing is disposed between the inner wall of the first fixing ring and the outer wall of the paddle shaft.

In a preferred embodiment of the present invention, the sand-liquid mixing assembly further includes a first centralizer disposed outside the first accommodating cylinder.

In a preferred embodiment of the present invention, the screw pump assembly includes a first connection section, a screw pump accommodating section and a second connection section sequentially connected from a position close to the sand-liquid mixing assembly to a position far away from the sand-liquid mixing assembly, wherein:

the screw pump accommodating section comprises a third accommodating cylinder and a fourth accommodating cylinder, the third accommodating cylinder and the fourth accommodating cylinder are both of cylindrical structures with openings at two ends, one end of the third accommodating cylinder is connected with one end of the fourth accommodating cylinder, the other end of the third accommodating cylinder is connected with the first connecting section, the other end of the fourth accommodating cylinder is connected with the second connecting section, the screw pump rotor is arranged in the third accommodating cylinder, the inner wall of the third containing cylinder is provided with a screw pump stator matched with the screw pump rotor, a gap for liquid to pass through is reserved between the screw pump stator and the screw pump rotor, one end of the screw pump rotor passes through the first connecting section and is connected with the stirring shaft, and the other end of the screw pump rotor penetrates through the fourth accommodating cylinder and extends into the second connecting section.

In a preferred embodiment of the present invention, a first pair of wheels is sleeved outside the screw pump rotor, the first pair of wheels is connected to an end of the paddle shaft, a first positioning key is disposed between an outer wall of the screw pump rotor and an inner wall of the first pair of wheels, and the end of the screw pump rotor abuts against the first buffer block.

In a preferred embodiment of the present invention, a second boss is disposed on the screw pump rotor in the fourth accommodating cylinder along a circumferential direction of the screw pump rotor, the screw pump rotor is sleeved with a first fastening nut, a second fixing ring is sleeved on an outer side of the screw pump rotor between the second boss and the first fastening nut, the second fixing ring is fixedly connected to the fourth accommodating cylinder, a plurality of third liquid passing holes for passing liquid through are reserved between an outer wall of the second fixing ring and an inner wall of the fourth accommodating cylinder, and a second bearing is disposed between an inner wall of the second fixing ring and the outer wall of the screw pump rotor.

In a preferred embodiment of the present invention, the screw pump assembly further includes a second centralizer disposed outside the fourth accommodation cylinder.

In a preferred embodiment of the present invention, the first connecting section includes a second accommodating cylinder, the second accommodating cylinder is a cylindrical structure with two open ends, one end of the second containing cylinder is connected with the third containing cylinder, the other end of the second containing cylinder is connected with the first containing cylinder, a third boss is arranged on the screw pump rotor in the second accommodating cylinder along the circumferential direction of the screw pump rotor, a second fastening nut is sleeved on the screw pump rotor, a third fixing ring is sleeved on the outer side of the screw pump rotor between the third boss and the second fastening nut and fixedly connected with the second accommodating cylinder, and a plurality of second liquid passing holes for liquid to pass through are reserved between the outer wall of the third fixing ring and the inner wall of the second containing cylinder, and a third bearing is arranged between the inner wall of the third fixing ring and the outer wall of the screw pump rotor.

In a preferred embodiment of the present invention, the second connecting section includes a fifth receiving cylinder and a rotor shaft disposed in the fifth receiving cylinder, the fifth receiving cylinder is a cylindrical structure with two open ends, one end of the fifth receiving cylinder is connected to the fourth receiving cylinder, the rotor shaft is connected to a second pair of wheels sleeved outside the screw pump rotor, a second positioning key is disposed between an inner wall of the second pair of wheels and an outer wall of the screw pump rotor, a second receiving groove is disposed on an end surface of the rotor shaft connected to the screw pump rotor, a second buffer block is disposed in the second receiving groove, and an end of the screw pump rotor abuts against the second buffer block.

In a preferred embodiment of the present invention, a fourth boss is disposed on the rotor shaft along a circumferential direction of the rotor shaft, a third fastening nut is sleeved on the rotor shaft, a fourth fixing ring is sleeved on an outer side of the rotor shaft between the fourth boss and the third fastening nut, the fourth fixing ring is fixedly connected to the fifth accommodating cylinder, a plurality of fourth liquid passing holes for passing liquid through are reserved between an outer wall of the fourth fixing ring and an inner wall of the fifth accommodating cylinder, and a fourth bearing is disposed between the inner wall of the fourth fixing ring and the outer wall of the rotor shaft.

In a preferred embodiment of the present invention, the sand filtering assembly includes a plurality of sand-containing tiles connected in sequence, the sand-containing tiles are of a cylindrical structure with openings at two ends, sand filtering chambers are formed in the sand-containing tiles, a plurality of sand-containing liquid outlet holes are formed in the side walls of the sand-containing tiles, the sand filtering chambers of the sand-containing tiles are communicated with each other through the openings at two ends of the sand-containing tiles, a string pipe penetrates through the sand filtering chambers of the sand-containing tiles, the connecting long shaft is rotatably disposed in the string pipe, two ends of the connecting long shaft respectively extend out from two ends of the string pipe and are pivoted with the corresponding first universal coupling and the second universal coupling, string pipe liquid outlet holes communicated with the sand filtering chambers are correspondingly formed in the string pipe, and a check valve unidirectionally communicated with the sand filtering chambers from the inside of the string pipe is disposed at each string pipe liquid outlet hole, the sand filtration device is characterized in that a sieve plate is arranged on the inner wall of the sand filtration cavity, a plurality of sand filtration holes are formed in the sieve plate, a filter layer is clamped between the sieve plate and the inner wall of the sand filtration cavity, and the sand filtration cavity is communicated with the outside through the sand filtration holes, the filter layer and the sand containing tile liquid outlet holes in sequence.

In a preferred embodiment of the present invention, the outer wall of the sand-containing tile is provided with a plurality of supporting ribs, and each supporting rib abuts against the inner wall of the oil well casing.

In a preferred embodiment of the present invention, the outer walls of the openings at both ends of the sand-containing tiles are provided with annular flanges, and the multi-piece slips tightly clamp the flanges at the openings connected to the adjacent sand-containing tiles, and connect two adjacent slips through a plurality of screws.

In a preferred embodiment of the present invention, the check valve includes a valve cover and a valve seat, the valve cover is a cylindrical structure with one end sealed and the other end open, the valve seat is disposed at the open end of the valve cover, a valve body accommodating chamber is formed between the valve cover and the valve seat, a check valve liquid inlet hole communicated with the string pipe liquid outlet hole and a plurality of check valve liquid outlet holes communicated with the sand filtration chamber are respectively formed in the valve seat, a valve rod and a valve cap connected with the valve rod are disposed in the valve body accommodating chamber, a pressure spring is sleeved on the valve rod, one end of the pressure spring abuts against an inner wall of the valve body accommodating chamber, and the other end of the pressure spring abuts against the valve cap, so that the valve cap seals the check valve liquid inlet hole.

In a preferred embodiment of the present invention, a sixth accommodating cylinder and a first reducing cylinder are sleeved outside the first universal coupling, the sixth accommodating cylinder and the first reducing cylinder are both of a cylindrical structure with two open ends, one end of the sixth accommodating cylinder is connected to the fifth accommodating cylinder, the other end of the sixth accommodating cylinder is connected to one end of the first reducing cylinder, and the other end of the first reducing cylinder is connected to an open end of the sand-containing tile.

In a preferred embodiment of the present invention, the inner diameter of the first diameter-changing cylinder is gradually reduced from the sixth receiving cylinder to the sand-containing tile, the outer wall of the end portion of the first diameter-changing cylinder and the outer wall of the opening of the sand-containing tile are both provided with annular flanges, and the end portion of the first diameter-changing cylinder and the flange of the opening of the sand-containing tile are tightly clamped by multi-disc slips, and two adjacent slips are connected by a plurality of screws.

In a preferred embodiment of the present invention, one end of the second universal coupling is pivotally connected to the end of the connecting long shaft, a second diameter-changing cylinder is sleeved outside the second universal coupling, the second diameter-changing cylinder is a cylindrical structure with two open ends, and the second diameter-changing cylinder is connected to the open end of the sand-containing tile.

In a preferred embodiment of the present invention, the inner diameter of the second reducing cylinder is gradually reduced from the sixth receiving cylinder to the sand-containing tile, the outer wall of the end portion of the second reducing cylinder and the outer wall of the opening of the sand-containing tile are both provided with annular flanges, and the end portion of the second reducing cylinder and the flange of the opening of the sand-containing tile are tightly clamped by multi-disc slips, and two adjacent slips are connected by a plurality of screws.

In a preferred embodiment of the invention, the horizontal well sand removal string device further comprises a sealing transmission assembly, the sealing transmission assembly comprises a sealing cylinder, a bearing cylinder and a sealing shaft, the sealing cylinder and the bearing cylinder are both of tubular structures with openings at two ends, one end of the sealing cylinder is connected with the second reducing cylinder, the other end of the sealing cylinder is connected with one end of the bearing cylinder, the other end of the bearing cylinder is connected with the outer wall of the driving motor, the sealing shaft penetrates through the sealing cylinder and can be rotatably arranged in the sealing cylinder and the bearing cylinder, the outer wall of the sealing shaft is hermetically connected with the inner wall of the sealing cylinder, a fifth bearing is arranged between the outer wall of the sealing shaft and the inner wall of the bearing cylinder, one end of the sealing shaft is pivoted with the end part of the second universal coupling, and the other end of the sealing shaft is connected with the motor shaft of the driving motor.

In a preferred embodiment of the present invention, the sealing shaft is connected to a third pair of wheels sleeved outside the motor shaft, a third positioning key is disposed between an inner wall of the third pair of wheels and an outer wall of the motor shaft, a third accommodating groove is disposed on an end surface of the sealing shaft connected to the motor shaft, a third buffer block is embedded in the third accommodating groove, and an end of the motor shaft abuts against the third buffer block.

In a preferred embodiment of the present invention, a fourth fastening nut is disposed on an outer wall of the sealing shaft, a shaft sleeve is sleeved on an outer side of the sealing shaft, a fourth positioning key is disposed between an inner wall of the shaft sleeve and the outer wall of the sealing shaft, two ends of the shaft sleeve are respectively abutted against the fourth fastening nut and the fifth bearing, a sealing ring is disposed between the inner wall of the shaft sleeve and the outer wall of the sealing shaft, a fifth boss is disposed on the inner wall of the sealing cylinder along a circumferential direction of the sealing cylinder, and a sealing sleeve is disposed between the outer wall of the shaft sleeve and the fifth boss.

In a preferred embodiment of the present invention, a sixth boss is disposed on an inner wall of the bearing cylinder along a circumferential direction of the bearing cylinder, the fifth bearing is disposed between an outer wall of the seal shaft and the sixth boss, bearing fixing rings are respectively disposed at a top and a bottom of the sixth boss, an annular top sleeve is sleeved on the seal shaft at a position opposite to the sixth boss, bearing bodies are respectively disposed above and below the top sleeve, and two ends of each bearing body are respectively abutted to the corresponding bearing fixing ring and the corresponding top sleeve.

In a preferred embodiment of the present invention, a third centralizer is disposed outside the sealing cylinder.

In a preferred embodiment of the present invention, an elevator hanger matched with an external elevator is disposed on an outer wall of the bearing cylinder, and the elevator hanger is an annular boss-shaped structure disposed along a circumferential direction of the bearing cylinder.

In a preferred embodiment of the present invention, a connecting seat is disposed between the driving motor and the oil pipe, the connecting seat is a cylindrical structure with two open ends, one end of the connecting seat is connected to an outer wall of the driving motor, the other end of the connecting seat is connected to a bottom end of the oil pipe, a cable is disposed in the oil pipe, one end of the cable is connected to a ground power supply device, and the other end of the cable passes through the connecting seat and is connected to a power supply end of the driving motor.

In a preferred embodiment of the present invention, a fourth centralizer is disposed on an outer side of the connecting seat.

The invention provides a sand removing method, which comprises the following steps:

step S1: introducing clean water into an oil pipe to replace crude oil in the oil pipe, and then taking out an operation pipe column positioned in an oil well casing of a horizontal well;

step S2: connecting and assembling the sand-liquid mixing assembly, the screw pump assembly and the sand filtering assembly, sleeving a flange cover and a wellhead sealing element on the outer side of the oil pipe at the wellhead of the horizontal well, wherein the flange cover and the wellhead sealing element are positioned above a wellhead large four-way;

step S3: the assembled sand-liquid mixing assembly, the screw pump assembly and the sand filtering assembly penetrate through the large four-way joint of the wellhead and are lowered into an oil well casing, and the sand-liquid mixing assembly, the screw pump assembly and the sand filtering assembly are fixed at the wellhead of a horizontal well, so that a pipe column above the sand filtering assembly is sealed;

step S4: connecting and assembling a driving motor with the sand-liquid mixing assembly, the screw pump assembly and the sand filtering assembly at the wellhead of the horizontal well, connecting the flange cover with the wellhead large four-way joint, arranging a wellhead sealing element between the flange cover and the wellhead large four-way joint, and lowering the sand-liquid mixing assembly, the screw pump assembly, the sand filtering assembly and the driving motor to a horizontal production section;

step S5: starting a driving motor, wherein a motor shaft of the driving motor sequentially passes through a second universal coupling, a connecting long shaft, a first universal coupling and a screw pump rotor to transmit power to a stirring shaft, and the stirring blade fully mixes the formation sand and the liquid in the horizontal production section through the rotation of the stirring shaft;

step S6: the screw pump rotor generates suction force in the rotating process, formation sand is mixed in liquid and sequentially enters the sand filtering component through the inside of the sand-liquid mixing component, the inside of the screw pump component and a liquid conveying channel formed in the sand filtering component, the formation sand mixed in the liquid is filtered by the sand filtering component and is retained in the sand filtering component, and the filtered liquid is discharged by the sand filtering component and flows back to a horizontal production section to finish the sand cleaning work of the horizontal well.

In a preferred embodiment of the present invention, the step S6 further includes,

step S7: when the driving motor does work suddenly, the driving motor needs to be stopped and the stratum sand filtered in the sand filtering assembly needs to be cleaned for the sand filtering assembly to reach the maximum sand containing value.

In a preferred embodiment of the present invention, the cleaning of the formation sand in the sand filter assembly in step S7 includes the following steps:

step S701: lifting the horizontal well sand removal pipe column device to the position of the wellhead big four-way, stopping lifting, removing the flange cover and the wellhead sealing element, continuously lifting the horizontal well sand removal pipe column device until the driving motor is positioned above the wellhead big four-way, and removing the driving motor;

step S702: continuously lifting the sand-liquid mixing assembly, the screw pump assembly and the sand filtering assembly to the position above the wellhead big four-way;

step S703: horizontally placing the sand-liquid mixing assembly, the screw pump assembly and the sand filtering assembly, and cleaning the formation sand filtered in the sand filtering assembly;

step S704: after the formation sand in the sand filtering assembly is cleaned, the horizontal well sand removal pipe column device is assembled according to the steps S1 to S4 and then is lowered to a horizontal production section again;

step S705: repeating steps S5-S6 until the formation sand in the horizontal productive interval is cleaned.

In a preferred embodiment of the present invention, the sealing process performed on the tubular column above the sand-filtering assembly in step S3 is: the sand filtering component and the driving motor are sequentially connected with a sealing cylinder and a bearing cylinder, an annular sealing gasket is arranged at the connecting position of the top of the bearing cylinder and the driving motor, and a third buffer block is arranged at the end part of the sealing shaft, so that the end part of a motor shaft of the driving motor is abutted to the third buffer block.

From the above, the horizontal well sand removal pipe column device and the sand removal method have the characteristics and advantages that: the sand-liquid mixing component, the screw pump component, the sand filtering component and the driving motor are sequentially connected to the bottom of the oil pipe from the horizontal production section to the well mouth direction, the sand-liquid mixing component extends into the horizontal production section in the horizontal well along with the oil pipe, wherein a stirring shaft and a stirring blade arranged on the stirring shaft are arranged in the sand-liquid mixing component, liquid in the horizontal production section can be stirred through the rotation of the stirring shaft and the stirring blade, the aim of fully mixing formation sand and the liquid is achieved, a screw pump rotor is arranged in the screw pump component, a connecting long shaft penetrating through the sand filtering component is arranged in the sand filtering component, one end of the stirring shaft is connected with one end of the screw pump rotor, the other end of the screw pump rotor is connected with one end of the connecting long shaft through a first universal coupling, and the other end of the connecting long shaft is connected with a motor shaft of the driving motor through a second universal coupling, the driving motor can drive the connecting long shaft, the screw pump rotor and the stirring shaft to synchronously rotate, and the first universal coupling and the second universal coupling are arranged to realize power transmission in a non-concentric state, so that the transmission requirement in a horizontal production section is met, and the normal work of the horizontal well sand cleaning pipe column device is ensured. In addition, the inside of sand liquid mixing assembly, the inside of screw pump subassembly and the inside of sand filtering component are formed with the infusion passageway that is linked together to make the liquid that has mixed the stratum sand flow to the sand filtering component in through the infusion passageway, thereby realized the stratum sand filtering in the liquid, and with the liquid discharge that does not contain the stratum sand to the outside requirement of sand filtering component, thereby can carry out the loop filter to the liquid in the horizontal production section, guarantee to carry out the effect of thoroughly cleaing away to the stratum sand in the horizontal production section.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.

Wherein:

FIG. 1: is a front sectional view of the horizontal well sand removal pipe column device.

FIG. 2: is a front sectional view of the sand-liquid mixing component in the horizontal well sand cleaning pipe column device.

FIG. 3: is a front sectional view of the screw pump assembly in the horizontal well sand cleaning pipe column device.

FIG. 4: is a front sectional view of the sand filtering component in the horizontal well sand cleaning pipe column device.

FIG. 5: is a schematic structural diagram of a single flow valve in the horizontal well sand removal pipe column device.

FIG. 6: the invention relates to a front cross-sectional view of a sealing transmission assembly and a driving motor in a horizontal well sand cleaning pipe column device.

FIG. 7: a partial enlarged view of the position a in fig. 6.

FIG. 8: is a schematic cross-sectional view of a first containing cylinder in the horizontal well sand cleaning pipe column device.

FIG. 9: is a schematic cross-sectional view of the upper part of the paddle blade in the horizontal well sand removal pipe column device.

FIG. 10: is a schematic cross-sectional view of the lower part of the stirring blade in the horizontal well sand cleaning tubular column device.

FIG. 11: is a schematic cross-sectional view of a second containing cylinder in the horizontal well sand cleaning pipe column device.

FIG. 12: is a cross section schematic diagram of a fourth containing cylinder in the horizontal well sand cleaning pipe column device.

FIG. 13: is a schematic cross-sectional view of a fifth containing cylinder in the horizontal well sand cleaning pipe column device.

FIG. 14: is a cross section schematic diagram of a sand containing tile in the horizontal well sand cleaning pipe column device.

FIG. 15: is a schematic view of the front structure of the first universal coupler in the horizontal well sand cleaning tubular column device.

FIG. 16: is a schematic side view structure diagram of a first universal coupler in the horizontal well sand cleaning tubular column device.

FIG. 17: is a schematic view of the front structure of the second universal coupling in the horizontal well sand cleaning tubular column device.

FIG. 18: is a schematic side view structure diagram of a second universal coupling in the horizontal well sand cleaning tubular column device.

FIG. 19: is a cross section schematic diagram of a sealing cylinder in the horizontal well sand cleaning pipe column device.

FIG. 20: is a schematic cross-sectional view of a bearing cylinder in the horizontal well sand removal pipe column device.

FIG. 21: is a schematic connection diagram of each device in the process of replacing crude oil in an oil pipe in the sand removal method.

FIG. 22: the invention is a schematic connection diagram of each device in the process of removing the formation sand in the horizontal production section in the sand removing method.

The invention has the following reference numerals:

1. a sand-liquid mixing assembly; 101. A first housing cylinder;

1011. a circulation hole; 102. A paddle shaft;

1021. a first boss; 103. A paddle blade;

104. a nut; 105. A first centralizer;

106. a first retaining ring; 107. A first liquid passing hole;

108. a first buffer block; 2. A screw pump assembly;

201. a first connection section; 2011. A second accommodating cylinder;

2012. a first pair of wheels; 2013. A third fixing ring;

2014. a second liquid passing hole; 2015. A first positioning key;

2016. a second fastening nut; 202. A screw pump accommodating section;

2021. a third accommodating cylinder; 2022. A screw pump stator;

2023. a screw pump rotor; 20231, a second boss;

20232. a third boss; 2024. A third liquid passing hole;

2025. a second centralizer; 2026. A second retaining ring;

2027. a first fastening nut; 2028. A second positioning key;

2029. a fourth accommodating cylinder; 203. A second connection section;

2031. a fifth accommodating cylinder; 2032. A rotor shaft;

2033. a third fastening nut; 2034. A fourth liquid passing hole;

2035. a second buffer block; 2036. A second pair of wheels;

2037. a fourth boss; 2038. A fourth retaining ring;

3. a first universal coupling; 301. A sixth accommodating cylinder;

302. a first reducing cylinder; 303. A third through hole;

304. a fourth via hole; 4. A sand filtration assembly;

401. sand containing tiles; 4011. A liquid outlet hole of the sand containing tile;

402. a support edge; 403. Slips;

404. stringing pipes; 4041. A liquid outlet hole of the string pipe;

405. connecting the long shaft; 406. A sieve plate;

407. buckling; 408. A check valve;

4081. a valve housing; 4082. A valve seat;

40821. a check valve liquid inlet hole; 40822, making liquid outlet of check valve;

4083. a valve body accommodating chamber; 4084. A pressure spring;

4085. a bonnet; 4086. A valve stem;

409. a filter layer; 5. A second universal coupling;

501. a second reducing cylinder; 502. A first through hole;

503. a second through hole; 6. A sealed transmission assembly;

601. sealing the cylinder; 6011. A fifth boss;

602. a bearing cylinder; 6021. A sixth boss;

6022. hanging by an elevator; 603. A seal shaft;

604. a third bump stop 605, a bushing;

606. a fourth fastening nut; 607. A fifth bearing;

6071. jacking and sleeving; 6072. A bearing body;

6073. a bearing fixing ring; 608. A fourth positioning key;

609. a seal ring; 610. Sealing sleeves;

611. a third centralizer; 7. A drive motor;

701. a motor shaft; 702. A cable;

703. a connecting seat; 704. A fourth centralizer;

705. a third pair of wheels; 706. A third positioning key;

8. an oil pipe; 9. A first bearing;

901. a first oilless bearing rotating ring; 902. A first oilless bearing stationary ring;

903. a second oilless bearing stationary ring; 904. A second oilless bearing rotating ring;

10. a second bearing; 11. A third bearing;

12. a fourth bearing; 13. An oil well casing;

14. a flange cover; 15. A wellhead seal;

16. an elevator; 17. A water supply vehicle;

18. hoisting a crane; 19. Lifting a lifting hook;

20. a hoisting ring; 21. A big four-way of a wellhead;

22. provided is a machineshop truck.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

Example one

As shown in fig. 1 to 7, the invention provides a horizontal well cleaning pipe column device which is connected to the bottom of an oil pipe 8 and extends into an oil well casing 13 of a horizontal well along with the oil pipe 8. This horizontal well sand removal tubular column device includes sand liquid mixing component 1, screw pump subassembly 2, sand filtering component 4 and driving motor 7, sand liquid mixing component 1 is used for stirring the sand liquid and mixes, screw pump subassembly 2 is used for carrying out the transmission in order to drive sand liquid mixing component 1 and rotate and provide the suction to the sand liquid after mixing, sand filtering component 4 is used for carrying out the sand filtering to the sand liquid and handles, and discharge the liquid after filtering to the horizontal well in, driving motor 7 is used for providing power for screw pump subassembly 2's rotation, wherein: the sand-liquid mixing component 1 extends into a horizontal production section in the horizontal well, and the sand-liquid mixing component 1, the screw pump component 2, the sand filtering component 4 and the driving motor 7 are sequentially connected from the horizontal production section to the well head. The inside of the sand-liquid mixing component 1 is provided with a stirring shaft 102 and stirring blades 103 arranged on the stirring shaft 102, the inside of the screw pump component 2 is provided with a screw pump rotor 2023, the inside of the sand filtering component 4 is provided with a connecting long shaft 405 penetrating through the sand filtering component 4, one end of the stirring shaft 102 is connected with one end of the screw pump rotor 2023, the other end of the screw pump rotor 2023 is connected with one end of the connecting long shaft 405 through a first universal coupling 3, the other end of the connecting long shaft 405 is connected with a motor shaft 701 of a driving motor 7 through a second universal coupling 5, the motor 7 is connected with an oil pipe 8, a liquid conveying channel communicated with the inside of the sand-liquid mixing component 1, the inside of the screw pump component 2 and the inside of the sand filtering component 4 is formed, so that the sand liquid mixed by the sand liquid mixing component 1 flows into the sand filtering component 4 through the liquid conveying channel, and the formation sand mixed in the sand liquid is filtered by the sand filtering component 4.

In the invention, a sand-liquid mixing component 1, a screw pump component 2, a sand filtering component 4 and a driving motor 7 are sequentially connected to the bottom of an oil pipe 8 from a horizontal production section to a wellhead direction, the sand-liquid mixing component 1 extends into the horizontal production section in a horizontal well along with the oil pipe 8, wherein a stirring shaft 102 and stirring blades 103 are arranged inside the sand-liquid mixing component 1, liquid in the horizontal production section can be stirred through the rotation of the stirring shaft 102 and the stirring blades 103, the aim of fully mixing formation sand and the liquid is achieved, a screw pump rotor 2023 is arranged inside the screw pump component 2, a connecting long shaft 405 penetrating through the sand filtering component 4 is arranged inside the sand filtering component 4, one end of the stirring shaft 102 is connected with one end of the screw pump rotor 2023, the other end of the screw pump rotor 2023 is connected with one end of the connecting long shaft 405 through a first universal coupling 3, the other end of the connecting long shaft 405 is connected with a motor shaft 701 of the driving motor 7 through a second universal coupling 5, the connecting long shaft 405, the screw pump rotor 2023 and the stirring shaft 102 can be driven to synchronously rotate by the driving motor 7, and the first universal coupling 3 and the second universal coupling 5 are arranged to realize power transmission in a non-concentric state, so that the transmission requirement in a horizontal production section is met, and the normal work of the horizontal well sand removal pipe column device is ensured. In addition, the inside of sand liquid mixing assembly 1, the inside of screw pump subassembly 2 and the inside of sand filtering component 4 are formed with the infusion passageway that is linked together to make the liquid that has mixed the formation sand can flow to sand filtering component 4 in through the infusion passageway, thereby realized the formation sand filtering in the liquid, and with the liquid discharge that does not contain the formation sand to the outside requirement of sand filtering component 4, thereby can carry out the loop filter to the liquid in the horizontal production section, guarantee to carry out the effect of thoroughly cleaing away to the formation sand in the horizontal production section.

In an alternative embodiment of the present invention, as shown in fig. 1, 2, and 8, the sand-liquid mixing assembly 1 further includes a first accommodating cylinder 101, the first accommodating cylinder 101 is a cylindrical structure with openings at both ends, the paddle shaft 102 is disposed in the first accommodating cylinder 101 along a length direction of the first accommodating cylinder 101, as shown in fig. 9 and 10, the paddle blades 103 are disposed on the paddle shaft 102, one end of the paddle blade 103 is fixedly connected to an outer wall of the paddle shaft 102, the other end of the paddle blade 103 extends in a direction away from the paddle shaft 102, a plurality of circulation holes 1011 are uniformly formed on an outer wall of the first accommodating cylinder 101 opposite to the paddle blade 103 along a circumferential direction of the first accommodating cylinder 101, and the first accommodating cylinder 101 at an end away from each circulation hole 1011 is connected to the screw pump assembly 2. When the paddle shaft 102 drives the paddle blades 103 to rotate, liquid in the horizontal production section can be stirred, the liquid and formation sand can be fully mixed, the liquid and the formation sand can be discharged to the outside of the first accommodating cylinder 101 through the circulating holes 1011, and circulating flow of the liquid and the formation sand inside and outside the first accommodating cylinder 101 is realized.

Further, as shown in fig. 1 and fig. 2, a first receiving groove is formed in an end surface of the paddle shaft 102, which is far away from the paddle blade 103, a first buffer block 108 is embedded in the first receiving groove, one end of the paddle shaft 102, which is close to the paddle blade 103, is connected to a hemispherical nut 104, which stabilizes the paddle blade 103, through a screw thread, and the nut 104 abuts against the paddle blade 103.

Further, as shown in fig. 1 and 2, an annular first boss 1021 is arranged at one end of the paddle shaft 102, which is far away from the paddle blades 103, along the circumferential direction of the paddle shaft 102, a first fixing ring 106 is sleeved on the outer side of the paddle shaft 102 between the first boss 1021 and the paddle blades 103, the first fixing ring 106 is fixedly connected with the first accommodating cylinder 101, a plurality of first liquid passing holes 107 are reserved between the outer wall of the first fixing ring 106 and the inner wall of the first accommodating cylinder 101 for liquid to pass through, the first liquid passing holes 107 are uniformly distributed along the circumferential direction of the first accommodating cylinder 101, and the upper portion and the lower portion of the first accommodating cylinder 101 are communicated through the first liquid passing holes 107, so that liquid can smoothly pass through the first accommodating cylinder 101. A first bearing 9 is arranged between the inner wall of the first fixing ring 106 and the outer wall of the paddle stirring shaft 102, and the paddle stirring shaft 102 can stably and smoothly rotate through the first bearing 9.

Specifically, as shown in fig. 2, first bearing 9 establishes first oilless bearing rotating ring 901 and second oilless bearing rotating ring 904 in stirring oar axle 102 outside including rotating ground, second oilless bearing rotating ring 904 is located the below of first oilless bearing rotating ring 901, and the top of second oilless bearing rotating ring 904 and the bottom butt of first oilless bearing rotating ring 901, the outside of second oilless bearing rotating ring 904 and first oilless bearing rotating ring 901 corresponds the cover and is equipped with second oilless bearing stationary ring 903 and first oilless bearing stationary ring 902, the top of second oilless bearing stationary ring 903 and the bottom butt of first oilless bearing stationary ring 902, and the bottom edge of second oilless bearing stationary ring 903 and the top edge of first oilless bearing stationary ring 902 all through many hexagon socket head cap bolts and first solid fixed ring 106 fixed connection. Through the arrangement of the first bearing 9, the concentric rotation of the stirring shaft 102 and the screw pump rotor 2023 is realized, the problem that an oil bearing needs to be sealed is solved, and the effect that the bearing can still normally rotate in a high-pressure liquid environment under the condition that lubricating oil is not needed is achieved.

Further, the first oilless bearing dynamic ring 901, the first oilless bearing static ring 902, the second oilless bearing static ring 903 and the second oilless bearing dynamic ring 904 can be made of, but not limited to, steel.

Further, as shown in fig. 1, 2, and 8, the sand-liquid mixing assembly 1 further includes a first centralizer 105, the first centralizer 105 is disposed outside the first accommodating cylinder 101, and the first centralizer 105 is fixed on an outer wall of the first accommodating cylinder 101 by a plurality of hexagon socket head bolts, and an outer wall of the first centralizer 105 abuts against an inner wall of the oil well casing 13. The first centralizer 105 ensures that the sand-liquid mixing component 1 can stably move in the oil well casing 13 in the horizontal production section, and the stability of the whole device after the driving motor 7 is started can be improved.

In an alternative embodiment of the present invention, as shown in fig. 1, fig. 3, fig. 11 to fig. 13, the screw pump assembly 2 includes a first connection section 201, a screw pump housing section 202 and a second connection section 203 which are sequentially connected from a position close to the sand-liquid mixing assembly 1 to a position far away from the sand-liquid mixing assembly 1, wherein: the screw pump accommodating section 202 includes a third accommodating cylinder 2021 and a fourth accommodating cylinder 2029, both the third accommodating cylinder 2021 and the fourth accommodating cylinder 2029 are cylindrical structures with openings at both ends, one end of the third accommodating cylinder 2021 is fixedly connected with one end of the fourth accommodating cylinder 2029 by a plurality of hexagon socket head bolts, the other end of the third accommodating cylinder 2021 is connected with the first connecting section 201, the other end of the fourth accommodating cylinder 2029 is connected with the second connecting section 203, a screw pump rotor 2023 is arranged in the third accommodating cylinder 2021 along the length direction of the third accommodating cylinder 2021, a screw pump stator 2022 matched with the screw pump rotor 2023 is arranged on the inner wall of the third accommodating cylinder 2021, a gap for liquid to pass is left between the screw pump stator 2022 and the screw pump rotor 2023, one end of the screw pump rotor 2023 passes through the first connecting section 201 and is connected with the paddle shaft 102, and the other end of the screw pump rotor 2023 passes through the fourth accommodating cylinder 2029 and extends into the second connecting section 203. The screw pump rotor 2023 can not only drive the paddle shaft 102 to rotate, but also can apply suction force to liquid when the screw pump rotor 2023 rotates, so that the liquid mixed with formation sand can be sucked into the horizontal well sand cleaning pipe column device. After entering the third accommodating cylinder 2021, the liquid may flow into the fourth accommodating cylinder 2029 through a gap between the screw pump stator 2022 and the screw pump rotor 2023.

Further, the screw pump stator 2022 may be made of, but not limited to, rubber.

Further, as shown in fig. 1 and 3, a first pair of wheels 2012 is sleeved outside the screw pump rotor 2023, the first pair of wheels 2012 is connected to an end portion of the paddle shaft 102, a first positioning key 2015 is disposed between an outer wall of the screw pump rotor 2023 and an inner wall of the first pair of wheels 2012, and the end portion of the screw pump rotor 2023 abuts against the first buffer block 108. Through the setting of first pair of wheel 2012, first locating key 2015 and first buffer block 108, can guarantee that screw pump rotor 2023 and the firm connection of stirring oar axle 102, simple structure, simple to operate.

Further, as shown in fig. 3, an annular second boss 20231 is disposed on the screw pump rotor 2023 in the fourth accommodating cylinder 2029 along the circumferential direction of the screw pump rotor 2023, the first fastening nut 2027 is fixedly sleeved on the screw pump rotor 2023 by screws, a second fixing ring 2026 is sleeved on the outer side of the screw pump rotor 2023 between the second boss 20231 and the first fastening nut 2027, the second fixing ring 2026 is connected to the fourth accommodating cylinder 2029, a plurality of third liquid passing holes 2024 are reserved between the outer wall of the second fixing ring 2026 and the inner wall of the fourth accommodating cylinder 2029 for passing the liquid therethrough, and the third liquid passing holes 2024 are uniformly arranged along the circumferential direction of the fourth accommodating cylinder 2029, and the upper portion and the lower portion of the fourth accommodating cylinder 2029 are communicated through the third liquid passing holes 2024, so that the liquid can smoothly pass through the fourth accommodating cylinder 2029. A second bearing 10 is arranged between the inner wall of the second fixing ring 2026 and the outer wall of the screw pump rotor 2023, the structure of the second bearing 10 is the same as that of the first bearing 9, and the second bearing 10 ensures that the screw pump rotor 2023 can stably and smoothly rotate.

Further, as shown in fig. 3, the screw pump assembly 2 further includes a second centralizer 2025, the second centralizer 2025 is disposed outside the fourth containing cylinder 2029, and the second centralizer 2025 is fixed on the outer wall of the fourth containing cylinder 2029 by a plurality of hexagon socket head bolts, and the outer wall of the second centralizer 2025 abuts against the inner wall of the well casing 13. The second centralizer 2025 ensures that the screw pump assembly 2 can stably move in the oil well casing 13 in the horizontal production section, and the stability of the whole device after the driving motor 7 is started can be improved.

In this embodiment, as shown in fig. 3, the first connecting section 201 includes a second receiving cylinder 2011, the second receiving cylinder 2011 is a cylindrical structure with two open ends, one end of the second receiving cylinder 2011 is connected to the third receiving cylinder 2021 through a plurality of hexagon socket head bolts, the other end of the second receiving cylinder 2011 is connected to the first receiving cylinder 101 through a plurality of hexagon socket head bolts, an annular third boss 20232 is provided on the screw pump rotor 2023 in the second receiving cylinder 2011 along the circumference of the screw pump rotor 2023, the second fastening nut 2016 is fixedly sleeved on the screw pump rotor 2023 through a screw thread, a third fixing ring 2013 is sleeved on the outer side of the screw pump rotor 2023 between the third boss 32 and the second fastening nut 2016, the third fixing ring 2013 is fixedly sleeved on the second receiving cylinder 2011 through a screw thread, and a plurality of second liquid passing holes 2014 are reserved between the outer wall of the third fixing ring 2013 and the inner wall of the second receiving cylinder 2011, the second liquid passing holes 2014 are uniformly distributed along the circumferential direction of the second containing cylinder 2011, and the upper part and the lower part of the second containing cylinder 2011 are communicated through the second liquid passing holes 2014, so that liquid can smoothly pass through the second containing cylinder 2011. A third bearing 11 is arranged between the inner wall of the third fixing ring 2013 and the outer wall of the screw pump rotor 2023, the structure of the third bearing 11 is the same as that of the first bearing 9, and the screw pump rotor 2023 can stably and smoothly rotate through the third bearing 11.

In this embodiment, as shown in fig. 3, the second connection section 203 includes a fifth receiving cylinder 2031 and a rotor shaft 2032, the fifth receiving cylinder 2031 is a cylindrical structure with two open ends, the rotor shaft 2032 is disposed in the fifth receiving cylinder 2031 along the length direction of the fifth receiving cylinder 2031, one end of the fifth receiving cylinder 2031 is connected to the fourth receiving cylinder 2029 through a plurality of hexagon socket head bolts, one end of the rotor shaft 2032 is connected to a second pair of wheels 2036 fixedly secured to the outer side of the screw pump rotor 2023, a second positioning key 2028 is disposed between the inner wall of the second pair of wheels 2036 and the outer wall of the screw pump rotor 2023, a second receiving groove is disposed on the end surface of the rotor shaft 2032 connected to the screw pump rotor 2023, a second buffer block 2035 is disposed in the second receiving groove, and the end of the screw pump rotor 2023 abuts against the second buffer block 2035. Through the setting of second pair wheel 2036, second navigation key 2028 and second buffer block 2035, can guarantee that screw pump rotor 2023 is connected with rotor shaft 2032 is firm, simple structure, simple to operate.

Further, as shown in fig. 3, a circular fourth boss 2037 is disposed on the rotor shaft 2032 along the circumferential direction of the rotor shaft 2032, the third fastening nut 2033 is fixedly sleeved on the rotor shaft 2032 through a screw thread, a fourth fixing ring 2038 is sleeved on the outer side of the rotor shaft 2032 between the fourth boss 2037 and the third fastening nut 2033, the fourth fixing ring 2038 is connected to the fifth accommodating cylinder 2031, a plurality of fourth liquid passing holes 2034 are reserved between the outer wall of the fourth fixing ring 2038 and the inner wall of the fifth accommodating cylinder 2031 for passing the liquid therethrough, the fourth liquid passing holes 2034 are uniformly arranged along the circumferential direction of the fifth accommodating cylinder 2031, and the upper portion and the lower portion of the fifth accommodating cylinder 2031 are communicated through the fourth liquid passing holes 2034, so that the liquid can pass through the fifth accommodating cylinder 2031 smoothly. A fourth bearing 12 is disposed between the inner wall of the fourth fixing ring 2038 and the outer wall of the rotor shaft 2032, the structure of the fourth bearing 12 is the same as that of the first bearing 9, and the rotor shaft 2032 can be stably and smoothly rotated by the fourth bearing 12.

In an optional embodiment of the present invention, as shown in fig. 1, 4, and 14, the sand filtering assembly 4 includes a plurality of sand holding tiles 401 connected in sequence, the sand holding tiles 401 are cylindrical structures with openings at both ends, a sand filtering chamber is formed inside the sand holding tiles 401, a plurality of sand holding tile liquid outlet holes 4011 are formed on a side wall of the sand holding tiles 401, the sand filtering chambers of the sand holding tiles 401 are communicated with each other through the openings at both ends of the sand holding tiles 401, a string pipe 404 is disposed between the sand filtering chambers of the sand holding tiles 401, a connecting long shaft 405 is rotatably disposed in the string pipe 404 along a length direction of the string pipe 404, one end of the connecting long shaft 405 extends from one end of the string pipe 404 and is pivotally connected to the first universal coupling 3, and the other end of the connecting long shaft 405 extends from the other end of the string pipe 404 and is pivotally connected to the second universal coupling 5. String pipe liquid outlet holes 4041 communicated with the sand filtering cavities are correspondingly formed in the string pipe 404, check valves 408 which are communicated with the sand filtering cavities in a one-way mode from the interior of the string pipe 404 are arranged at the positions of the string pipe liquid outlet holes 4041, sieve plates 406 are arranged on the inner walls of the sand filtering cavities, a plurality of sand filtering holes are formed in the sieve plates 406, filter layers 409 are arranged between the sieve plates 406 and the inner walls of the sand filtering cavities in a clamping mode, and the sand filtering cavities are communicated with the outside through the sand filtering holes, the filter layers 409 and the sand containing tile liquid outlet holes 4011 in sequence. The liquid mixed with the formation sand enters the sand filtering cavity through the string pipe liquid outlet hole 4041 and the check valve 408 on the string pipe 404, the liquid is discharged outwards through each sand filtering hole, the filtering layer 409 and each sand containing tile liquid outlet hole 4011 in sequence, the liquid flows back to the horizontal production section, and the formation sand in the liquid is filtered and retained in the sand filtering cavity.

Further, the sand containing tile 401 is formed by splicing two semi-cylindrical bodies with semicircular cross sections, the edges of the two cylindrical bodies are clamped through a buckle 407, the cross section of the sieve plate 406 is arc-shaped and matched with the inner wall of the sand filtering chamber, and the sieve plate 406 is fixed on the inner wall of the sand filtering chamber through a plurality of screws. The buckle 407 comprises a male buckle and a female buckle respectively connected to the edges of the two cylinders, and the male buckle and the female buckle are in matched clamping connection.

Further, the filtering layer 409 may be made of, but not limited to, chemical fiber.

Further, as shown in fig. 4, a plurality of elongated support ribs 402 are provided on the top and bottom outer walls of the sand containing tile 401 at intervals in the circumferential direction of the sand containing tile 401, and each support rib 402 abuts against the inner wall of the well casing 13 in the horizontal production section. The arrangement of the supporting ribs 402 ensures that when the sand containing tile 401 is close to the oil well casing 13, a gap can still be reserved between the outer wall of the sand containing tile 401 and the inner wall of the oil well casing 13, and the situation that liquid cannot be normally circulated due to blockage of the sand containing tile liquid outlet hole 4011 is avoided.

Further, as shown in fig. 4, the outer walls of the openings at both ends of the sand containing tile 401 are provided with annular flanges along the circumferential direction of the sand containing tile 401, and the multi-piece slips 403 tightly clamp the flanges at the connecting openings of the adjacent sand containing tiles 401 and connect two adjacent slips 403 through a plurality of screws. Cooperate through slips 403 and each flange that holds on the sand tile 401 to connect adjacent sand tile 401, connection structure is stable, and has certain deformation allowance, when the horizontal well sand removal tubular column device that drains to the inclined shaft section down, can satisfy certain deformation demand between the adjacent sand tile 401 of holding to guarantee that horizontal well sand removal tubular column device can transfer smoothly to the horizontal production section.

Specifically, as shown in fig. 4 and 5, the check valve 408 includes a valve housing 4081 and a valve seat 4082, the valve housing 4081 is a tubular structure with one end sealed and the other end open, one end of the valve seat 4082 is fixedly sleeved at the open end of the valve housing 4081, the valve seat 4082 is connected with the valve housing 4081 through a screw thread, the other end of the valve seat 4082 is welded on the outer wall of the string tube 404, a valve body accommodating chamber 4083 is formed between the valve housing 4081 and the valve seat 4082, a check valve inlet hole 40821 communicated with the sand-containing tile outlet hole 4011 is formed on one end of the valve seat 4082 near the string tube 404, a plurality of valve outlet holes 40822 communicated with the sand-filtering chamber are formed on the valve seat 4082 along the circumferential direction of the valve seat 4082, a valve rod 4086 is disposed in the valve body accommodating chamber 4083 along the length direction of the valve body accommodating chamber 4083, one end of the valve rod 4086 facing the check valve inlet hole 40821 is connected with a valve cap 85, a compression spring 4084 is sleeved on the valve rod 4086, the other end of the pressure spring 4084 abuts against the valve cap 4085 so that the valve cap 4085 blocks the check valve inlet port 40821.

The working principle of the check valve 408 is as follows: the liquid mixed with the formation sand in the string pipe 404 sequentially passes through the string pipe liquid outlet hole 4041 and the check valve liquid inlet hole 40821 to contact with the valve cap 4085, the pressure applied to the valve cap 4085 by the increase of the liquid is continuously increased until the pressure is larger than the elastic force of the pressure spring 4084, the valve cap 4085 and the valve rod 4086 are extruded to move towards the inside of the valve body accommodating cavity 4083, the check valve liquid inlet hole 40821 is opened, the liquid mixed with the formation sand sequentially passes through the check valve liquid inlet hole 40821 and the check valve liquid outlet holes 40822 to flow to the sand filtering cavity, when the sand filtering cavity is filled with the liquid, the sum of the pressure of the liquid in the sand filtering cavity and the elastic force of the pressure spring 4084 is larger than the pressure of the liquid in the string pipe 404, the valve cap 4085 and the valve rod 4086 are reset, the valve cap 4085 continuously seals the check valve liquid inlet hole 40821 to prevent the liquid from flowing back from the check valve liquid inlet hole 40.

Further, as shown in fig. 4, a sixth accommodating cylinder 301 and a first reducing cylinder 302 are sleeved outside the first universal coupling 3, the sixth accommodating cylinder 301 and the first reducing cylinder 302 are both of a cylindrical structure with openings at two ends, the inner diameter of the first reducing cylinder 302 is gradually reduced from the sixth accommodating cylinder 301 to the direction of the sand-containing tile 401, one end of the sixth accommodating cylinder 301 is connected with the fifth accommodating cylinder 2031 through a plurality of hexagon socket head bolts, the other end of the sixth accommodating cylinder 301 is connected with one end of the first reducing cylinder 302 through a plurality of hexagon socket head bolts, annular flanges are arranged on the outer wall of the other end of the first reducing cylinder 302 and the outer wall of the opening of the sand-containing tile 401 along respective circumferential directions, and the end of the first reducing cylinder 302 and the flange of the opening of the sand-containing tile 401 are tightly clamped by multi-disc slips 403, and are connected with two adjacent slips 403 through a plurality of screws. Connect first reducing cylinder 302 and hold sand tile 401 through slips 403, connection structure is stable, and has certain deformation allowance, when the horizontal well sand removal tubular column device that drains to the inclined shaft section down, can satisfy certain deformation demand between first reducing cylinder 302 and the hold sand tile 401 to guarantee that horizontal well sand removal tubular column device can transfer smoothly to the horizontal production section.

Further, as shown in fig. 4, one end of the second universal coupling 5 is pivotally connected to the end of the long shaft 405, a second reducing cylinder 501 is sleeved outside the second universal coupling 5, the second reducing cylinder 501 is a cylindrical structure with two open ends, the inner diameter of the second reducing cylinder 501 is gradually reduced from the sixth accommodating cylinder 301 to the sand containing tile 401, annular flanges are respectively arranged on the outer wall of the end of the second reducing cylinder 501 and the outer wall of the opening of the sand containing tile 401 along the respective circumferential directions, and the multi-disc slips 403 tightly clamp the end of the second reducing cylinder 501 and the flange of the opening of the sand containing tile 401 and are connected to two adjacent slips 403 through a plurality of screws. Connect second reducing cylinder 501 and hold sand tile 401 through slips 403, connection structure is stable, and has certain deformation allowance, when the horizontal well sand removal tubular column device that drains to the inclined shaft section down, certain deformation demand can be satisfied between second reducing cylinder 501 and the holding sand tile 401 to guarantee that horizontal well sand removal tubular column device can transfer smoothly to the horizontal production section.

Further, one end of the string pipe 404 extends out from one end of the sand filtering chamber and is connected with the first reducing cylinder 302 through a screw thread, and the other end of the string pipe 404 extends out from the other end of the sand filtering chamber and is connected with the second reducing cylinder 501 through a screw thread, so that stable connection of the string pipe 404 is guaranteed.

In an alternative embodiment of the present invention, as shown in fig. 1, 6, 19, and 20, the horizontal well sand cleaning pipe column device further includes a sealing transmission assembly 6, the sealing transmission assembly 6 includes a sealing cylinder 601, a bearing cylinder 602, and a sealing shaft 603, both the sealing cylinder 601 and the bearing cylinder 602 are cylindrical structures with two open ends, one end of the sealing cylinder 601 is connected with the second reducing cylinder 501 through a plurality of hexagon socket head bolts, the other end of the sealing cylinder 601 is connected with one end of the bearing cylinder 602 through a plurality of hexagon socket head bolts, the other end of the bearing cylinder 602 is connected with an outer wall of the driving motor 7 through a plurality of hexagon socket head bolts, the sealing shaft 603 penetrates through the sealing cylinder 601 and the bearing cylinder 602 along the length direction thereof and is rotatably disposed inside the sealing cylinder 601 and the bearing cylinder 602, the outer wall of the sealing shaft 603 is sealingly connected with an inner wall of the sealing cylinder 601, a fifth bearing 607 is disposed between the outer wall of the sealing shaft 603 and the inner wall, one end of the sealing shaft 603 is pivotally connected to the end of the second universal coupling 5, and the other end of the sealing shaft 603 is connected to the motor shaft 701 of the driving motor 7. Through the setting of sealed axle 603, guarantee that driving motor 7's power can be fast, stable transmission to connecting major axis 405 to through the cooperation of sealed jar 601 and sealed axle 603, guarantee good sealed effect, avoid liquid and driving motor 7 contact back damage driving motor 7, ensure long-term, stable work of driving motor 7.

Further, as shown in fig. 15 to 18, the top and the bottom of the first universal coupling 3 are both provided with a "U" -shaped connecting plate, the connecting plate at the top of the first universal coupling 3 is perpendicular to the connecting plate at the bottom of the first universal coupling 3, the connecting plate at the top of the first universal coupling 3 is provided with two opposite first through holes 502, and the connecting plate at the bottom of the first universal coupling 3 is provided with two opposite second through holes 503. The top and the bottom of the second universal coupling 5 are both provided with a U-shaped connecting plate, the connecting plate at the top of the second universal coupling 5 is vertical to the connecting plate at the bottom of the second universal coupling 5, the connecting plate at the top of the second universal coupling 5 is provided with two opposite third through holes 303, and the connecting plate at the bottom of the second universal coupling 5 is provided with two opposite fourth through holes 304.

Further, as shown in fig. 6, the sealing shaft 603 is connected to a third pair of wheels 705 fixedly sleeved outside the motor shaft 701, a third positioning key 706 is disposed between an inner wall of the third pair of wheels 705 and an outer wall of the motor shaft 701, a third accommodating groove is disposed on an end surface of the sealing shaft 603 connected to the motor shaft 701, a third buffer block 604 is embedded in the third accommodating groove, and an end portion of the motor shaft 701 abuts against the third buffer block 604. Through the arrangement of the third pair of wheels 705, the third positioning key 706 and the third buffer block 604, the motor shaft 701 and the seal shaft 603 can be stably connected, and the structure is simple and the installation is convenient.

Further, as shown in fig. 6, a fourth fastening nut 606 is fixedly sleeved on the outer wall of the sealing shaft 603 through a screw thread, a shaft sleeve 605 is sleeved on the outer side of the sealing shaft 603, a fourth positioning key 608 is arranged between the inner wall of the shaft sleeve 605 and the outer wall of the sealing shaft 603, two ends of the shaft sleeve 605 are respectively abutted to the fourth fastening nut 606 and a fifth bearing 607, a sealing ring 609 is fixedly sleeved on the sealing shaft 603, the sealing ring 609 is tightly pressed between the inner wall of the shaft sleeve 605 and the outer wall of the sealing shaft 603, an annular fifth boss 6011 is arranged on the inner wall of the sealing cylinder 601 along the circumferential direction of the sealing cylinder 601, a sealing sleeve 610 is fixedly sleeved on the shaft sleeve 605, and the sealing sleeve 610 is tightly pressed between the outer wall of the shaft sleeve 605 and the fifth. Through the cooperation of sealing shaft 603, sealing washer 609 and seal cover 610, guarantee good sealed effect.

Further, the sealing ring 609 and the sealing sleeve 610 may be made of, but not limited to, rubber.

Further, as shown in fig. 6, an annular sixth boss 6021 is disposed on the inner wall of the bearing cylinder 602 along the circumferential direction of the bearing cylinder 602, the fifth bearing 607 is disposed between the outer wall of the seal shaft 603 and the sixth boss 6021, bearing fixing rings 6073 are respectively disposed at the top and the bottom of the sixth boss 6021, an annular top sleeve 6071 is sleeved at a position on the seal shaft 603 opposite to the sixth boss 6021, bearing bodies 6072 are respectively disposed above and below the top sleeve 6071, and two ends of each bearing body 6072 are respectively abutted to the corresponding bearing fixing ring 6073 and the top sleeve 6071. Through the setting of fifth bearing 607, guarantee that sealed axle 603 can be stable, smooth and easy rotation.

Further, as shown in fig. 6 and 19, a third centralizer 611 is fitted around the outside of the seal cylinder 601, the third centralizer 611 is fixed to the outer wall of the seal cylinder 601 by a plurality of hexagon socket head bolts, and the outer wall of the third centralizer 611 abuts against the inner wall of the well casing 13.

Further, as shown in fig. 6, an elevator hanger 6022 is provided on the outer wall of the bearing cylinder 602 to be engaged with the external elevator 16, and the elevator hanger 6022 is an annular boss-like structure provided along the circumferential direction of the bearing cylinder 602. In the process of descending the horizontal well sand cleaning pipe column device, the elevator hanging 6022 can be clamped and connected in a matched mode through the external elevator 16, so that the horizontal well sand cleaning pipe column device is integrally lifted and then placed in the oil well casing 13.

In an alternative embodiment of the present invention, as shown in fig. 6, the driving motor 7 is connected to the oil pipe 8 through a connection seat 703, the connection seat 703 is a cylindrical structure with two open ends, one end of the connection seat 703 is connected to the outer wall of the driving motor 7 through a plurality of hexagon socket head bolts, the other end of the connection seat 703 is in threaded connection with the bottom end of the oil pipe 8, a cable 702 is disposed in the oil pipe 8, one end of the cable 702 extends to the ground and is connected to a power supply device, and the other end of the cable 702 passes through the connection seat 703 and is connected to the power supply end of the.

Further, as shown in fig. 6, a fourth centralizer 704 is disposed outside the connection seat 703, the fourth centralizer 704 is fixed to an outer wall of the connection seat 703 by a plurality of hexagon socket head bolts, and an outer wall of the fourth centralizer 704 abuts against an inner wall of the oil well casing 13. The fourth centralizer 704 is matched with the third centralizer 611, so that the driving motor 7 can stably move in the oil well casing 13 in the horizontal production section, and the stability of the whole device after the driving motor 7 is started can be improved.

Specifically, the inside of the first accommodating cylinder 101, the first liquid passing hole 107, the second accommodating cylinder 2011, the second liquid passing hole 2014, the gap between the screw pump rotor 2023 and the screw pump stator 2022, the inside of the fourth accommodating cylinder 2029, the third liquid passing hole 2024, the inside of the fifth accommodating cylinder 2031, the fourth liquid passing hole 2034, the inside of the sixth accommodating cylinder 301, the inside of the first reducing cylinder 302 and the inside of the string pipe 404 are sequentially communicated, a liquid conveying channel for the liquid mixed with the formation sand to pass through is formed, the liquid mixed with the formation sand enters the liquid conveying channel from the sand-liquid mixing assembly 1, flows into the sand filtering assembly 4 for filtering, and then the liquid without the formation sand is discharged into the horizontal production section.

In an alternative embodiment of the present invention, the materials of the first buffer block 108, the second buffer block 2035 and the third buffer block 604 can be, but not limited to, nylon.

In an alternative embodiment of the present invention, the first centralizer 105, the second centralizer 2025, the third centralizer 611, and the fourth centralizer 704 may be made of, but not limited to, rubber.

In an optional embodiment of the present invention, circular ring grooves and circular ring bosses are disposed on the connecting end surface of the first containing cylinder 101 and the second containing cylinder 2011, on the connecting end surface of the second containing cylinder 2011 and the third containing cylinder 2021, on the connecting end surface of the third containing cylinder 2021 and the fourth containing cylinder 2029, on the connecting end surface of the fourth containing cylinder 2029 and the fifth containing cylinder 2031, on the connecting end surface of the fifth containing cylinder 2031 and the sixth containing cylinder 301, on the connecting end surface of the sixth containing cylinder 301 and the first reducing cylinder 302, on the connecting end surface of the second reducing cylinder 501 and the seal cylinder 601, on the connecting end surface of the seal cylinder 601 and the bearing cylinder 602, between the connecting positions of the bearing cylinder 602 and the driving motor 7, and between the connecting positions of the driving motor 7 and the connecting seat 703, circular ring gaskets are disposed between each circular ring groove and the corresponding circular ring boss, and each gasket is embedded in the corresponding circular ring groove, and is pressed and fixed by the circular lug boss.

Further, the material of each sealing gasket can be, but is not limited to, nylon.

The horizontal well sand removal pipe column device has the characteristics and advantages that:

firstly, in the horizontal well sand cleaning pipe column device, a stirring paddle shaft 102 and stirring paddle blades 103 are arranged in a sand-liquid mixing component 1, and liquid in a horizontal production section can be stirred through rotation of the stirring paddle shaft 102 and the stirring paddle blades 103, so that the aim of fully mixing formation sand and the liquid is fulfilled.

Secondly, in the horizontal well sand cleaning pipe column device, a screw pump rotor 2023 is arranged inside a screw pump assembly 2, a connecting long shaft 405 penetrating through a sand filtering assembly 4 is arranged inside the sand filtering assembly 4, one end of a propeller stirring shaft 102 is connected with one end of the screw pump rotor 2023, the other end of the screw pump rotor 2023 is connected with one end of the connecting long shaft 405 through a first universal coupling 3, the other end of the connecting long shaft 405 is connected with a motor shaft 701 of a driving motor 7 through a second universal coupling 5, the connecting long shaft 405, the screw pump rotor 2023 and the propeller stirring shaft 102 can be driven to synchronously rotate through the driving motor 7, power transmission in a non-concentric state is realized through the arrangement of the first universal coupling 3 and the second universal coupling 5, so that the transmission requirement in a horizontal production section is met, and the normal work of the horizontal well sand cleaning pipe column device is ensured.

Thirdly, in this horizontal well sand removal tubular column device in the inside of sand liquid mixing assembly 1, the inside of screw pump subassembly 2 and the inside of sand filtering component 4 are formed with the infusion passageway that is linked together, so that the liquid that has mixed the formation sand can flow to in the sand filtering component 4 through the infusion passageway, thereby realized the formation sand filtering to in the liquid, and the liquid that will not contain the formation sand discharges to the outside requirement of sand filtering component 4, thereby can carry out the loop filter to the liquid in the horizontal production section, guarantee to carry out the effect of thoroughly cleaing away to the formation sand in the horizontal production section.

Example two

As shown in fig. 21 and 22, the present invention provides a sand cleaning method, which includes the following steps:

step S1: introducing clean water into the oil pipe 8 by using a water supply vehicle 17 to replace crude oil in the oil pipe 8 and taking out an operation tubular column in an oil well casing 13 of the horizontal well;

step S2: connecting and assembling the sand-liquid mixing component 1, the screw pump component 2 and the sand filtering component 4, sleeving a flange cover 14 and a wellhead sealing piece 15 on the outer side of an oil pipe 8 at the wellhead of the horizontal well, and positioning the flange cover 14 and the wellhead sealing piece 15 above a wellhead large four-way 21;

specifically, the first accommodating cylinder 101, the second accommodating cylinder 2011, the third accommodating cylinder 2021, the fourth accommodating cylinder 2029, the fifth accommodating cylinder 2031, the sixth accommodating cylinder 301, the first reducing cylinder 302, the sand-containing shoes 401, the second reducing cylinder 501, the sealing cylinder 601 and the bearing cylinder 602 are connected and assembled in sequence, and are placed on the pipe frame and placed in the horizontal direction. The motor shaft 701 of the driving motor 7, the third paired wheel 705 and the third positioning key 706 are assembled, the flange cover 14 and the wellhead sealing member 15 are sleeved on the outer side of the oil pipe 8 at the wellhead of the horizontal well, and the fourth centralizer 704, the driving motor 7, the oil pipe 8, the cable 702 and the connecting seat 703 are assembled.

Step S3: the assembled sand-liquid mixing component 1, the screw pump component 2 and the sand filtering component 4 penetrate through a large four-way joint 21 of a well mouth and are placed into an oil well casing 13, and the sand-liquid mixing component 1, the screw pump component 2 and the sand filtering component 4 are fixed at the well mouth of a horizontal well, so that a pipe column above the sand filtering component 4 is sealed;

specifically, the elevator 16 is clamped with an elevator hanger 6022 on the outer wall of the bearing cylinder 602, the lifting ring 20 is hung on a lifting hook 19 of the crane 18, the lifting ring 20 is connected with the elevator 16, the crane 18 is operated to lift the assembled first containing cylinder 101, second containing cylinder 2011, third containing cylinder 2021, fourth containing cylinder 2029, fifth containing cylinder 2031, sixth containing cylinder 301, first reducing cylinder 302, sand containing shoes 401, second reducing cylinder 501, sealing cylinder 601 and bearing cylinder 602 to be positioned at the central position above the wellhead large cross 21, the crane 18 is operated to lower the assembled first containing cylinder 101, second containing cylinder 501, third containing cylinder 2021, fourth containing cylinder 2029, fifth containing cylinder 401, sixth containing cylinder 203301, first reducing cylinder 302, sand containing shoes 401, second containing cylinder 501, sealing cylinder 601 and bearing cylinder 602 to enter the oil well 2011 13, and the reducer cross 21 is seated on the top of the wellhead large cross 21, then the hoist ring 20 is removed to be separated from the elevator 16, the hoist 18 is operated to move the hoist ring 20 to a position not to interfere with normal construction, a packing between the bearing cylinder 602 and the driving motor 7 is installed, and a third buffer block 604 is installed.

Step S4: connecting and assembling a driving motor 7 with a sand-liquid mixing component 1, a screw pump component 2 and a sand filtering component 4 at the wellhead of the horizontal well, connecting a flange cover 14 with a wellhead large four-way 21, arranging a wellhead sealing element 15 between the flange cover 14 and the wellhead large four-way 21, and lowering the sand-liquid mixing component 1, the screw pump component 2, the sand filtering component 4 and the driving motor 7 to a horizontal production section;

specifically, the operation engineering truck 22 makes the winch hang above the large four-way 21 of the wellhead, and simultaneously makes the driving motor 7 be in the central position above the large four-way 21 of the wellhead, the winch of the operation engineering truck 22 rotates to make the motor shaft 701 of the driving motor 7 butt with the sealing shaft 603, the flange surface on the outer wall of the driving motor 7 butt with the flange surface of the bearing cylinder 602, and the horizontal well sand cleaning pipe column device is lowered to the lower part of the large four-way 21 of the wellhead through fixing of a plurality of inner hexagon bolts, the wellhead sealing element 15 and the flange cover 14 are connected and assembled with the large four-way 21 of the wellhead, and the horizontal well sand cleaning pipe column device is lowered again to the horizontal production section and then is stopped.

Step S5: starting the driving motor 7, transmitting power to the stirring shaft 102 by a motor shaft 701 of the driving motor 7 sequentially through the second universal coupling 5, the connecting long shaft 405, the first universal coupling 3 and the screw pump rotor 2023, and fully mixing the formation sand and the liquid in the horizontal production section by the stirring blade 103 through the rotation of the stirring shaft 102;

step S6: the screw pump rotor 2023 generates suction force in the rotation process, the formation sand is mixed in the liquid and sequentially enters the sand filtering component 4 through a liquid conveying channel formed by the inside of the sand-liquid mixing component 1, the inside of the screw pump component 2 and the inside of the sand filtering component 4, the formation sand mixed in the liquid is filtered by the sand filtering component 4 and is retained in the sand filtering component 4, the filtered liquid is discharged by the sand filtering component 4 and flows back to the horizontal production section, the circulation filtration of the liquid mixed with the formation sand and the filtered liquid without the formation sand in the horizontal production section is formed, and the sand cleaning work of the horizontal well is completed.

In an alternative embodiment of the present invention, step S6 is followed by further comprising,

step S7: while filtering the formation sand in the liquid, operating the engineering truck 22 to rotate the winch, so as to slowly push the horizontal well sand removal pipe column device forward in the horizontal production section to remove the formation sand at different positions in the horizontal production section, when the driving motor 7 performs work shock (namely, the water discharge capacity of the sand containing tile 401 suddenly drops and the water absorption capacity of the screw pump rotor 2023 suddenly drops), the formation sand remained after filtering in the sand filtering cavity is close to the maximum sand containing value, the phenomenon can be displayed through the change of current on an instrument panel connected with the cable 702 on the engineering truck, at the moment, the driving motor 7 needs to stop working, and the formation sand filtered in the sand filtering component 4 needs to be cleaned.

Further, the cleaning of the formation sand in the sand screen assembly 4 in step S7 includes the following steps:

step S701: lifting the horizontal well sand cleaning pipe column device to the position of a wellhead large four-way 21, then stopping lifting, removing a flange cover 14 and a wellhead sealing member 15, continuously lifting the horizontal well sand cleaning pipe column device until a driving motor 7 is positioned above the wellhead large four-way 21, positioning a bearing cylinder 602 on the top plane of the wellhead large four-way 21, stopping lifting, clamping an elevator 16 with an elevator hanger 6022, operating an engineering truck 22 to enable a winch to rotate, lowering the horizontal well sand cleaning pipe column device until the elevator 16 is clamped on the top plane of the wellhead large four-way 21, removing inner hexagon bolts between the driving motor 7 and the bearing cylinder 602, and enabling the driving motor 7 and devices above the driving motor 7 to leave construction positions through the engineering truck 22;

step S702: operating a crane 18 to lower a lifting ring 20, hanging the lifting ring 20 with an elevator 16, and lifting the sand-liquid mixing component 1, the screw pump component 2 and the sand filtering component 4 above a large four-way 21 of a wellhead;

step S703: placing a sand-liquid mixing component 1, a screw pump component 2 and a sand filtering component 4 which are lifted out of a wellhead on a pipe frame to be horizontally placed, opening a take-down slip 403, opening sand containing tiles 401, cleaning stratum sand in the sand containing tiles 401, and reassembling the sand containing tiles 401 and the slip 403 after cleaning;

step S704: after the formation sand in the sand filtering assembly 4 is cleaned, the horizontal well sand removal pipe column device is assembled according to the steps S1 to S4 and then is lowered to the horizontal production section again;

step S705: and repeating the steps S5-S6 until the formation sand in the horizontal production section is completely removed, recovering the sand removal pipe column device of the horizontal well for maintenance, and putting the production pipe column into the horizontal well for recovering production.

In an alternative embodiment of the present invention, the sealing process performed on the tubular string above the sand filter assembly 4 in step S3 is: a seal cylinder 601 and a bearing cylinder 602 are connected in sequence between the sand filter 4 and the drive motor 7, an annular seal is provided at the connection position between the top of the bearing cylinder 602 and the drive motor 7, and a third buffer block 604 is provided at the end of the seal shaft 603 so that the end of the motor shaft 701 of the drive motor 7 abuts against the third buffer block 604.

The sand removing method has the characteristics and advantages that:

the sand removing method is a brand new oil well sand removing method, has simple construction method and simple and convenient operation, solves the problem that settled sand in a horizontal production section cannot be completely removed, avoids pollution and damage of sand washing liquid to a stratum in the traditional hydraulic sand washing method, shortens the time occupied by the oil well due to hydraulic sand washing construction, reduces the construction workload, improves the working efficiency, reduces the labor intensity of working personnel, and ensures the smooth development of the horizontal oil well.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.

Claims

1. The utility model provides a horizontal well sand removal tubular column device, connects in the bottom of oil pipe (8), and follows oil pipe (8) stretch into in oil well casing (13) to the horizontal well, a serial communication port, horizontal well sand removal tubular column device is including stirring sand liquid mixing assembly (1), the drive that mixes to sand liquid mixing assembly (1) rotates and provides screw pump assembly (2) of suction to the sand liquid after mixing, right sand filtering assembly (4) that sand liquid carries out the sand filtration and handles and do driving motor (7) that the rotation of screw pump assembly (2) provided power, wherein:

the sand-liquid mixing assembly (1) extends into a horizontal production section in the horizontal well, and the sand-liquid mixing assembly (1), the screw pump assembly (2), the sand filtering assembly (4) and the driving motor (7) are sequentially connected from the horizontal production section to a wellhead direction;

a stirring shaft (102) and a stirring blade (103) arranged on the stirring shaft (102) are arranged inside the sand-liquid mixing assembly (1), a screw pump rotor (2023) is arranged inside the screw pump assembly (2), a connection long shaft (405) penetrating through the sand filtering assembly (4) is arranged inside the sand filtering assembly (4), one end of the stirring shaft (102) is connected with one end of the screw pump rotor (2023), the other end of the screw pump rotor (2023) is connected with one end of the connection long shaft (405) through a first universal coupling (3), the other end of the connection long shaft (405) is connected with a motor shaft (701) of the driving motor (7) through a second universal coupling (5), and the motor (7) is connected with the oil pipe (8);

and infusion passages communicated with each other are formed inside the sand-liquid mixing assembly (1), the screw pump assembly (2) and the sand filtering assembly (4), so that the sand liquid mixed by the sand-liquid mixing assembly (1) flows into the sand filtering assembly (4) through the infusion passages.

2. The horizontal well sand removal string device according to claim 1, wherein the sand-liquid mixing assembly (1) further comprises a first accommodating cylinder (101), the first accommodating cylinder (101) is a cylindrical structure with two open ends, the paddle shaft (102) is arranged in the first accommodating cylinder (101) along the length direction of the first accommodating cylinder (101), the paddle blades (103) are arranged on the outer wall of the paddle shaft (102), a plurality of circulation holes (1011) are uniformly formed in the outer wall of the first accommodating cylinder (101) opposite to the paddle blades (103) along the circumferential direction of the first accommodating cylinder (101), and the first accommodating cylinder (101) far away from one end of each circulation hole (1011) is connected with the screw pump assembly (2).

3. The horizontal well sand removal string device according to claim 2, wherein a first accommodating groove is formed in the end face, far away from the paddle blade (103), of the paddle shaft (102), a first buffer block (108) is embedded in the first accommodating groove, a nut (104) for stabilizing the paddle blade (103) is screwed at one end, close to the paddle blade (103), of the paddle shaft (102), and the nut (104) is abutted to the paddle blade (103).

4. The horizontal well sand removal string device according to claim 2, wherein one end of the paddle shaft (102) far away from the paddle blades (103) is provided with a first boss (1021) along the circumferential direction of the paddle shaft (102), a first fixing ring (106) is sleeved on the outer side of the paddle shaft (102) between the first boss (1021) and the paddle blades (103), the first fixing ring (106) is fixedly connected with the first accommodating cylinder (101), a plurality of first liquid passing holes (107) for liquid to pass through are reserved between the outer wall of the first fixing ring (106) and the inner wall of the first accommodating cylinder (101), and a first bearing (9) is arranged between the inner wall of the first fixing ring (106) and the outer wall of the paddle shaft (102).

5. A horizontal well cleaning string device according to claim 3, characterized in that the sand and liquid mixing assembly (1) further comprises a first centralizer (105), said first centralizer (105) being arranged outside said first housing cylinder (101).

6. The horizontal well sand removal string device according to claim 5, wherein the screw pump assembly (2) comprises a first connecting section (201), a screw pump accommodating section (202) and a second connecting section (203) which are sequentially connected from the direction close to the sand-liquid mixing assembly (1) to the direction far away from the sand-liquid mixing assembly (1), wherein:

the screw pump accommodating section (202) comprises a third accommodating cylinder (2021) and a fourth accommodating cylinder (2029), both the third accommodating cylinder (2021) and the fourth accommodating cylinder (2029) are of a cylindrical structure with two open ends, one end of the third accommodating cylinder (2021) is connected with one end of the fourth accommodating cylinder (2029), the other end of the third accommodating cylinder (2021) is connected with the first connecting section (201), the other end of the fourth accommodating cylinder (2029) is connected with the second connecting section (203), the screw pump rotor (2023) is arranged in the third accommodating cylinder (2021), a screw pump stator (2022) matched with the screw pump rotor (2023) is arranged on the inner wall of the third accommodating cylinder (2021), a gap for liquid to pass through is reserved between the screw pump stator (2022) and the screw pump rotor (2023), and one end of the screw pump rotor (2023) passes through the first connecting section (201) and is connected with the stirring paddle shaft (102), the other end of the screw pump rotor (2023) penetrates through the fourth accommodating cylinder (2029) and extends into the second connecting section (203).

7. The horizontal well sand removal string device according to claim 6, characterized in that a first pair of wheels (2012) is sleeved outside the screw pump rotor (2023), the first pair of wheels (2012) is connected with the end part of the paddle shaft (102), a first positioning key (2015) is arranged between the outer wall of the screw pump rotor (2023) and the inner wall of the first pair of wheels (2012), and the end part of the screw pump rotor (2023) is abutted to the first buffer block (108).

8. The horizontal well sand cleaning pipe column device according to claim 6, characterized in that a second boss (20231) is arranged on the screw pump rotor (2023) in the fourth containing cylinder (2029) along the circumference of the screw pump rotor (2023), the screw pump rotor (2023) is sleeved with a first fastening nut (2027), a second fixing ring (2026) is sleeved on the outer side of the screw pump rotor (2023) between the second boss (20231) and the first fastening nut (2027), the second fixing ring (2026) is fixedly connected with the fourth containing cylinder (2029), and a plurality of third liquid passing holes (2024) for liquid to pass through are reserved between the outer wall of the second fixing ring (2026) and the inner wall of the fourth containing cylinder (2029), and a second bearing (10) is arranged between the inner wall of the second fixing ring (2026) and the outer wall of the screw pump rotor (2023).

9. The horizontal well sand removal string device according to claim 6, characterized in that the screw pump assembly (2) further comprises a second centralizer (2025), the second centralizer (2025) being arranged outside the fourth housing cylinder (2029).

10. The horizontal well sand cleaning pipe column device according to claim 6, wherein the first connection section (201) comprises a second containing cylinder (2011), the second containing cylinder (2011) is a cylindrical structure with two open ends, one end of the second containing cylinder (2011) is connected with the third containing cylinder (2021), the other end of the second containing cylinder (2011) is connected with the first containing cylinder (101), a third boss (32) is arranged on the screw pump rotor (2023) in the second containing cylinder (2011) along the circumferential direction of the screw pump rotor (2023), the screw pump rotor (2023) is sleeved with a second fastening nut (2016), a third fixing ring (2013) is sleeved on the outer side of the screw pump rotor (2023) between the third boss (20232) and the second fastening nut (2016), and the third fixing ring (2013) is fixedly connected with the second containing cylinder (2011), and a plurality of second liquid passing holes (2014) for liquid to pass through are reserved between the outer wall of the third fixing ring (2013) and the inner wall of the second containing cylinder (2011), and a third bearing (11) is arranged between the inner wall of the third fixing ring (2013) and the outer wall of the screw pump rotor (2023).

11. Horizontal well sand cleaning string device according to claim 6, characterized in that the second connection section (203) comprises a fifth receiving cylinder (2031) and a rotor shaft (2032) arranged inside the fifth receiving cylinder (2031), the fifth accommodating cylinder (2031) is a cylindrical structure with two open ends, one end of the fifth accommodating cylinder (2031) is connected with the fourth accommodating cylinder (2029), the rotor shaft (2032) is connected with a second pair of wheels (2036) sleeved outside the screw pump rotor (2023), a second positioning key (2028) is arranged between the inner wall of the second pair of wheels (2036) and the outer wall of the screw pump rotor (2023), a second containing groove is arranged on the end surface of the rotor shaft (2032) connected with the screw pump rotor (2023), a second buffer block (2035) is embedded in the second accommodating groove, and the end part of the screw pump rotor (2023) is abutted against the second buffer block (2035).

12. The horizontal well sand removal string device according to claim 11, wherein a fourth boss (2037) is arranged on the rotor shaft (2032) along the circumferential direction of the rotor shaft (2032), a third fastening nut (2033) is sleeved on the rotor shaft (2032), a fourth fixing ring (2038) is sleeved on the outer side of the rotor shaft (2032) between the fourth boss (2037) and the third fastening nut (2033), the fourth fixing ring (2038) is fixedly connected with the wall of the fifth accommodating cylinder (2031), a plurality of fourth liquid passing holes (2034) for liquid to pass through are reserved between the outer wall of the fourth fixing ring (2038) and the inner wall of the fifth accommodating cylinder (2031), and a fourth bearing (12) is arranged between the inner wall of the fourth fixing ring (2038) and the outer wall of the rotor shaft (2032).

13. The horizontal well sand removal string device according to claim 12, wherein the sand filtering component (4) comprises a plurality of sand holding tiles (401) which are connected in sequence, the sand holding tiles (401) are of a cylindrical structure with two open ends, a sand filtering chamber is formed in each sand holding tile (401), a plurality of sand holding tile liquid outlet holes (4011) are formed in the side wall of each sand holding tile (401), the sand filtering chambers of the sand holding tiles (401) are communicated with each other through openings at two ends of each sand holding tile (401), a string pipe (404) penetrates between the sand filtering chambers of the sand holding tiles (401), the connecting long shaft (405) is rotatably arranged in the string pipe (404), two ends of the connecting long shaft (405) respectively extend out from two ends of the string pipe (404) and are pivoted with the corresponding first universal coupling (3) and the second universal coupling (5), the sand filtering device is characterized in that string pipe liquid outlet holes (4041) communicated with the sand filtering chambers are correspondingly formed in the string pipes (404), check valves (408) communicated with the sand filtering chambers in a one-way mode from the interiors of the string pipes 404 are arranged at the string pipe liquid outlet holes (4041), a sieve plate (406) is arranged on the inner wall of each sand filtering chamber, a plurality of sand filtering holes are formed in the sieve plate (406), a filtering layer (409) is clamped between the sieve plate (406) and the inner wall of each sand filtering chamber, and the sand filtering chambers are communicated with the outside sequentially through the sand filtering holes, the filtering layer (409) and the sand containing tile liquid outlet holes (4011).

14. The horizontal well sand removal string device according to claim 13, characterized in that a plurality of support ribs (402) are provided on the outer wall of the sand containment tile (401), each support rib (402) abutting against the inner wall of the well casing (13).

15. The horizontal well sand removal string device according to claim 13, wherein the outer walls of the openings at both ends of the sand containing tiles (401) are provided with annular flanges, and a multi-piece slip (403) clamps the flanges at the connecting openings of the adjacent sand containing tiles (401) and connects two adjacent slips (403) through a plurality of screws.

16. The horizontal well sand removal pipe column device according to claim 13, wherein the check valve (408) comprises a valve cover (4081) and a valve seat (4082), the valve cover (4081) is a tubular structure with one end sealed and the other end open, the valve seat (4082) is arranged at the open end of the valve cover (4081), a valve body accommodating chamber (4083) is formed between the valve cover (4081) and the valve seat (4082), a check valve liquid inlet hole (40821) communicated with the string pipe liquid outlet hole (4041) and a plurality of check valve liquid outlet holes (40822) communicated with the sand filtration chamber are respectively formed in the valve seat (4082), a valve rod (4086) and a valve cap (4085) connected with the valve rod (4086) are arranged in the valve body accommodating chamber (4083), a pressure spring (4084) is sleeved on the valve rod (4086), one end of the pressure spring (4084) is abutted against the inner wall of the valve body accommodating chamber (4083), the other end of the pressure spring (4084) is abutted against the valve cap (4085) so that the valve cap (4085) blocks the check valve liquid inlet hole (40821).

17. The horizontal well sand removal string device according to claim 13, characterized in that a sixth accommodating cylinder (301) and a first reducing cylinder (302) are sleeved outside the first universal coupling (3), the sixth accommodating cylinder (301) and the first reducing cylinder (302) are both of a cylindrical structure with two open ends, one end of the sixth accommodating cylinder (301) is connected with the fifth accommodating cylinder (2031), the other end of the sixth accommodating cylinder (301) is connected with one end of the first reducing cylinder (302), and the other end of the first reducing cylinder (302) is connected with the open end of the sand containing tile (401).

18. The horizontal well sand removal string device according to claim 17, wherein the inner diameter of the first reducing cylinder (302) is gradually reduced from the sixth accommodating cylinder (301) to the sand containing tile (401), annular flanges are arranged on the outer wall of the end part of the first reducing cylinder (302) and the outer wall of the opening of the sand containing tile (401), and a multi-disc slip (403) tightly clamps the end part of the first reducing cylinder (302) and the flange of the opening of the sand containing tile (401), and is connected with two adjacent slips (403) through a plurality of screws.

19. The horizontal well sand removal string device according to claim 17, wherein one end of the second universal coupling (5) is pivoted with the end part of the connecting long shaft (405), a second reducing cylinder (501) is sleeved on the outer side of the second universal coupling (5), the second reducing cylinder (501) is of a cylindrical structure with two open ends, and the second reducing cylinder (501) is connected with the open end of the sand containing tile (401).

20. The horizontal well sand removal string device according to claim 19, wherein the inner diameter of the second reducing cylinder (501) is gradually reduced from the sixth accommodating cylinder (301) to the sand containing tile (401), annular flanges are arranged on the outer wall of the end part of the second reducing cylinder (501) and the outer wall of the opening of the sand containing tile (401), and a multi-disc slip (403) tightly clamps the end part of the second reducing cylinder (501) and the flange of the opening of the sand containing tile (401) and is connected with two adjacent slips (403) through a plurality of screws.

21. The horizontal well sand removal string device according to claim 19, further comprising a sealing transmission assembly (6), wherein the sealing transmission assembly (6) comprises a sealing cylinder (601), a bearing cylinder (602) and a sealing shaft (603), the sealing cylinder (601) and the bearing cylinder (602) are both of a cylindrical structure with two open ends, one end of the sealing cylinder (601) is connected with the second reducing cylinder (501), the other end of the sealing cylinder (601) is connected with one end of the bearing cylinder (602), the other end of the bearing cylinder (602) is connected with the outer wall of the driving motor (7), the sealing shaft (603) penetrates through and is rotatably arranged inside the sealing cylinder (601) and the bearing cylinder (602), and the outer wall of the sealing shaft (603) is connected with the inner wall of the sealing cylinder (601) in a sealing manner, the outer wall of the sealing shaft (603) and the inner wall of the bearing cylinder (602) are provided with a fifth bearing (607), one end of the sealing shaft (603) is pivoted with the end part of the second universal coupling (5), and the other end of the sealing shaft (603) is connected with a motor shaft (701) of the driving motor (7).

22. The horizontal well sand removal string device according to claim 21, wherein the sealing shaft (603) is connected with a third pair of wheels (705) sleeved outside the motor shaft (701), a third positioning key (706) is arranged between the inner wall of the third pair of wheels (705) and the outer wall of the motor shaft (701), a third accommodating groove is formed in the end face of the sealing shaft (603) connected with the motor shaft (701), a third buffer block (604) is embedded in the third accommodating groove, and the end of the motor shaft (701) is abutted against the third buffer block (604).

23. The horizontal well sand cleaning pipe column device according to claim 21, characterized in that a fourth fastening nut (606) is arranged on the outer wall of the sealing shaft (603), a shaft sleeve (605) is sleeved on the outer side of the sealing shaft (603), a fourth positioning key (608) is arranged between the inner wall of the shaft sleeve (605) and the outer wall of the sealing shaft (603), two ends of the shaft sleeve (605) are respectively abutted to the fourth fastening nut (606) and the fifth bearing (607), a sealing ring (609) is arranged between the inner wall of the shaft sleeve (605) and the outer wall of the sealing shaft (603), a fifth boss (6011) is arranged on the inner wall of the sealing cylinder (601) along the circumferential direction of the sealing cylinder (601), and a sealing sleeve (610) is arranged between the outer wall of the shaft sleeve (605) and the fifth boss (6011).

24. The horizontal well sand removal string device according to claim 21, wherein a sixth boss (6021) is arranged on the inner wall of the bearing cylinder (602) along the circumferential direction of the bearing cylinder (602), the fifth bearing (607) is arranged between the outer wall of the sealing shaft (603) and the sixth boss (6021), bearing fixing rings (6073) are respectively arranged at the top and the bottom of the sixth boss (6021), an annular top sleeve (6071) is sleeved at a position on the sealing shaft (603) opposite to the sixth boss (6021), bearing bodies (6072) are respectively arranged above and below the top sleeve (6071), and two ends of each bearing body (6072) are respectively abutted to the corresponding bearing fixing ring (6073) and the top sleeve (6071).

25. Horizontal well sand removal string device according to claim 21, characterized in that a third centralizer (611) is arranged outside the sealing cylinder (601).

26. The horizontal well sand removal string device according to claim 21, characterized in that an elevator hanger (6022) matched with an external elevator (16) is arranged on the outer wall of the bearing cylinder (602), and the elevator hanger (6022) is an annular boss-shaped structure arranged along the circumferential direction of the bearing cylinder (602).

27. The horizontal well sand removal string device according to claim 1, characterized in that a connecting seat (703) is arranged between the driving motor (7) and the oil pipe (8), the connecting seat (703) is a cylindrical structure with two open ends, one end of the connecting seat (703) is connected with the outer wall of the driving motor (7), the other end of the connecting seat (703) is connected with the bottom end of the oil pipe (8), a cable (702) is arranged in the oil pipe (8), one end of the cable (702) is connected with a ground power supply device, and the other end of the cable (702) passes through the connecting seat (703) and is connected with a power supply end of the driving motor (7).

28. Horizontal well sandpipe string device according to claim 27, characterised in that a fourth centralizer (704) is arranged outside the connecting socket (703).

29. A sand removal method is characterized by comprising the following steps:

step S1: introducing clear water into the oil pipe (8) to replace crude oil in the oil pipe (8), and then taking out the operation pipe column positioned in an oil well casing (13) of the horizontal well;

step S2: connecting and assembling the sand-liquid mixing assembly (1), the screw pump assembly (2) and the sand filtering assembly (4), sleeving a flange cover (14) and a wellhead sealing element (15) on the outer side of the oil pipe (8) at the wellhead of the horizontal well, and positioning the flange cover (14) and the wellhead sealing element (15) above a wellhead large four-way joint (21);

step S3: the assembled sand-liquid mixing assembly (1), the screw pump assembly (2) and the sand filtering assembly (4) penetrate through the wellhead large four-way joint (21) and are lowered into an oil well casing (13), and the sand-liquid mixing assembly (1), the screw pump assembly (2) and the sand filtering assembly (4) are fixed at the wellhead of a horizontal well, so that a tubular column above the sand filtering assembly (4) is sealed;

step S4: connecting and assembling a driving motor (7) with the sand-liquid mixing assembly (1), the screw pump assembly (2) and the sand filtering assembly (4) at a wellhead of the horizontal well, connecting the flange cover (14) with the wellhead large four-way (21), arranging a wellhead sealing element (15) between the flange cover (14) and the wellhead large four-way (21), and lowering the sand-liquid mixing assembly (1), the screw pump assembly (2), the sand filtering assembly (4) and the driving motor (7) to a horizontal production section;

step S5: starting a driving motor (7), wherein a motor shaft (701) of the driving motor (7) sequentially passes through a second universal coupling (5), a connecting long shaft (405), a first universal coupling (3) and a screw pump rotor (2023) to transmit power to a stirring shaft (102), and the stirring shaft (102) rotates to enable a stirring blade (103) to fully mix formation sand and liquid in a horizontal production section;

step S6: the screw pump rotor (2023) generates suction force in the rotating process, formation sand is mixed in liquid and sequentially enters the sand filtering component (4) through a liquid conveying channel formed by the inside of the sand-liquid mixing component (1), the inside of the screw pump component (2) and the inside of the sand filtering component (4), the formation sand mixed in the liquid is filtered by the sand filtering component (4) and is retained in the sand filtering component (4), and the filtered liquid is discharged by the sand filtering component (4) and flows back to a horizontal production section to finish the sand removing work of the horizontal well.

30. A method of cleaning sand as claimed in claim 29, further comprising, after said step S6,

step S7: when the stratum sand in the liquid is filtered, the horizontal well sand removal pipe column device is slowly pushed forwards in the horizontal production section so as to remove the stratum sand at different positions in the horizontal production section, and when the driving motor (7) performs work suddenly dropping, the driving motor (7) needs to be stopped and the stratum sand filtered in the sand filtering assembly (4) needs to be removed for the sand filtering assembly (4) to reach the maximum sand containing value.

31. A method of cleaning formation sand in the sand screen assembly (4) as claimed in claim 30, wherein the step S7 includes the steps of:

step S701: lifting the horizontal well sand removal pipe column device to the position of the wellhead big four-way (21), stopping lifting, removing the flange cover (14) and the wellhead sealing element (15), continuously lifting the horizontal well sand removal pipe column device until the driving motor (7) is positioned above the wellhead big four-way (21), and removing the driving motor (7);

step S702: continuously lifting the sand-liquid mixing assembly (1), the screw pump assembly (2) and the sand filtering assembly (4) to the position above the wellhead large four-way (21);

step S703: horizontally placing the sand-liquid mixing assembly (1), the screw pump assembly (2) and the sand filtering assembly (4), and cleaning the formation sand filtered in the sand filtering assembly (4);

step S704: after the formation sand in the sand filtering assembly (4) is cleaned, the horizontal well sand removal pipe column device is assembled according to the steps S1 to S4 and then is lowered to a horizontal production section again;

32. A method for cleaning sand according to claim 29, wherein the step S3 of sealing the pipe column above the sand screen assembly (4) comprises the following steps: a sealing cylinder (601) and a bearing cylinder (602) are sequentially connected between the sand filtering component (4) and the driving motor (7), an annular sealing gasket is arranged at the connecting position of the top of the bearing cylinder (602) and the driving motor (7), and a third buffer block (604) is arranged at the end part of a sealing shaft (603), so that the end part of a motor shaft (701) of the driving motor (7) is abutted to the third buffer block (604).