CN113931598B

CN113931598B - Sand prevention filling device and using method thereof

Info

Publication number: CN113931598B
Application number: CN202111541588.8A
Authority: CN
Inventors: 李联中; 李晓明; 江正清; 高居刚; 徐洪涛; 徐建辉; 李振华
Original assignee: Weida Petroleum Equipment Co ltd
Current assignee: Weida Petroleum Equipment Co ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-02-25
Anticipated expiration: 2041-12-16
Also published as: CN113931598A

Abstract

The invention relates to the technical field of sand control filling of oil fields, in particular to a sand control filling device and a using method thereof, wherein the sand control filling device is set in a sleeve through a slip hanger, and the sleeve and the sand control filling device sequentially form a first annular cavity, a second annular cavity and a third annular cavity which are isolated from each other from top to bottom; the first oil pipe assembly and the second oil pipe assembly form an annular flow cavity and a middle through cavity with a closed bottom end together; one end of the circulation cavity is communicated with the first annular cavity, and the other end of the circulation cavity is communicated with the third annular cavity; the upper end of the sieve tube is communicated with the circulation cavity, the lower end of the sieve tube is connected with the guide shoe, the bottom of the guide shoe is closed, and the sleeve is provided with a perforation at the third annular cavity. The sand control filling device provided by the invention can protect a non-filling area while performing sand control filling, and when cleaning the pipe string, the cleaning liquid cannot be discharged into a well hole, so that the damage to the geology is reduced, and the sand control filling effect is improved.

Description

Sand prevention filling device and using method thereof

Technical Field

The invention relates to the technical field of sand prevention filling of oil fields, in particular to a sand prevention filling device and a using method thereof.

Background

The sand production of an oil well is a common problem in the process of exploiting a loose sandstone oil reservoir, and refers to a process or a phenomenon that part of dropped formation sand flows into a shaft along with oil reservoir fluid due to the fact that the structure of a rock stratum of a zone near the bottom of the well is damaged by comprehensive factors such as exploitation and operation of the oil well, so that a series of adverse effects are caused on normal production of the oil well, sand production causes a series of hazards such as sand burying of an oil reservoir, shaft sand blocking, equipment abrasion sand blocking, shaft wall collapse, casing damage and the like, the production cost of crude oil is increased, the difficulty of oil field management is increased, continuous sand production of the oil well can finally cause the production stop of the oil well or even abandonment, and therefore the sand production well needs to take sand prevention measures.

Because the different of oil deposit geological conditions and exploitation degree can arouse the circumstances that has high-pressure zone and low-pressure zone simultaneously in the same well, especially in the oil well of loose sandstone oil deposit, the low-pressure zone appears easily on upper portion, and the high-pressure zone (need the filling layer) is in the condition of lower part, how under the prerequisite of the low-pressure zone in protection upper portion, accomplish the sand control filling construction to high-pressure zone, is the problem that needs the solution at present badly. In addition, after filling, cleaning fluid is pumped from the casing pipe, enters the annular space between the outer cylinder and the central pipe through the well washing hole, and residual redundant mortar in the oil pipe is sucked into the well through annular filling, so that excessive cleaning fluid is absorbed by the mortar filled in the well and geological layers, the geology in the well hole becomes soft due to excessive water, and the gap between the outer cylinder of the well washing hole and the annular space of the central pipe is narrow, so that the well washing hole is blocked easily by the mortar.

Disclosure of Invention

In order to solve at least one of the technical problems, the invention provides a sand control filling device, which is set in a casing through a slip hanger and comprises a first oil pipe component, a second oil pipe component, a sieve pipe and a guide shoe which are sequentially connected from top to bottom; the casing and the sand control filling device form a first annular cavity, a second annular cavity and a third annular cavity which are mutually isolated from top to bottom in sequence; the first oil pipe assembly and the second oil pipe assembly form an annular flow cavity and a middle through cavity with a closed bottom end together; one end of the circulation cavity is communicated with the first annular cavity, and the other end of the circulation cavity is communicated with the third annular cavity; the upper end of the sieve tube is communicated with the circulation cavity, the lower end of the sieve tube is connected with the guide shoe, the bottom of the guide shoe is closed, and the sleeve is provided with a perforation at the third annular cavity.

Preferably, a rotating assembly is arranged in the second oil pipe assembly, and the rotating assembly is in rotating communication with or closes a passage between the third annular cavity and the middle through cavity; the central tube with the closed bottom is fixedly arranged at the center of the bottom of the second oil tube assembly, an air tube is radially arranged on the central tube, and the air tube is communicated with the rotating assembly.

Preferably, the first tubing assembly comprises a first joint, a first tubing, a first connecting ring, a packer and a second connecting ring which are coaxially arranged; the outer diameter of the first oil pipe is smaller than the inner diameters of the first connecting ring and the packer, and the first connecting ring, the packer and the packer form an upper section of the annular flow cavity together; the lower end of the first joint is in threaded connection with the first connecting ring and the packer respectively, and the upper end of the circulation cavity is blocked; the first connecting ring is provided with a first through hole communicated with the first annular cavity; the upper end of the second connecting ring is in threaded connection with the first oil pipe and the packer respectively, the lower end of the second connecting ring is connected with the second oil pipe assembly, and a second through hole communicated with the circulation cavity is axially formed in the second connecting ring.

Preferably, the second oil pipe assembly comprises a second inner oil pipe and a second outer oil pipe which are coaxially arranged, the lower end of the second inner oil pipe is hermetically and rotatably connected with the rotating assembly, the outer diameters of the second inner oil pipe and the rotating assembly are smaller than the inner diameter of the second outer oil pipe, and the second inner oil pipe and the rotating assembly together form the lower section of the circulation cavity; a third through hole communicated with the circulation cavity is formed in the side wall of the second outer oil pipe, a communicating pipe is arranged on the side wall of the rotating assembly, one end of the communicating pipe is communicated with the middle through cavity, the other end of the communicating pipe is in sealing butt joint with the inner wall of the second outer oil pipe, and the communicating pipe can be rotatably communicated with or staggered with the third through hole; the lower end face of the second outer oil pipe is fixedly connected with a filter screen, the rotating assembly is rotatably connected with the filter screen, the central pipe is fixedly connected with the filter screen, the lower end of the filter screen is connected with the sieve pipe, and the filter screen is provided with filter holes communicated with the circulation cavity and the sieve pipe.

Preferably, the upper end surface of the second inner oil pipe is in threaded connection with the first oil pipe assembly, the lower end surface of the second inner oil pipe is provided with an annular chute, and the inner side wall of the second inner oil pipe is provided with an L-shaped flow passage communicated with the rotating assembly; the central tube comprises a central tube body, a liquid phase flow channel and a gas phase flow channel are arranged inside the central tube body, a fifth through hole is formed in the outer side wall of the liquid phase flow channel, a sixth through hole is formed in the outer side wall of the gas phase flow channel, an annular sleeve is fixedly arranged on the outer circumference of the central tube body, a fourth annular cavity is arranged in the annular sleeve, the fourth annular cavity is communicated with the gas phase flow channel through the sixth through hole, the gas tube is arranged on the outer annular wall of the annular sleeve, one end of the gas tube is communicated with the fourth annular cavity, and the other end of the gas tube is communicated with the L-shaped flow channel.

Preferably, the rotating assembly comprises a sleeve and a rotation driving mechanism, the sleeve comprises an outer cylinder and an inner cylinder which are coaxially arranged at intervals and an annular base for connecting the outer cylinder and the inner cylinder, an annular sliding block and a mounting groove are arranged on the upper end surface of the outer cylinder, the annular sliding block is inserted into an annular sliding groove of the second inner oil pipe, the rotation driving mechanism is arranged in the mounting groove, the upper end surface of the rotation driving mechanism is fixedly connected with the lower end surface of the second inner oil pipe, the lower end surface of the rotation driving mechanism is rotatably connected with the mounting groove, and the communicating pipe is arranged on the side wall of the outer cylinder; the inner cylinder is rotatably sleeved outside the central tube in a sealing manner, and a fourth through hole is radially formed in the side wall of the inner cylinder; and in an initial state, the communicating pipe on the second inner oil pipe is communicated with the third through hole on the second outer oil pipe.

Preferably, the rotary driving mechanism comprises a fan-shaped sealing cylinder, the upper end surface of the sealing cylinder is fixedly connected to the lower end surface of the second inner oil pipe, an air hole is arranged on the sealing cylinder, the air hole is communicated with the L-shaped flow passage on the second inner oil pipe, a sealing plug is slidably arranged in the sealing cylinder, a limiting block is arranged on the sealing plug, and divides the inner cavity of the sealing cylinder into a first sealing cavity and a second sealing cavity, the first sealing cavity is communicated with the air hole, the two side walls of the sealing plug are respectively provided with a first annular rod and a second annular rod which can seal and pass through the two side walls of the sealing cylinder in a sliding way, and are respectively and fixedly connected with two side walls of the mounting groove of the outer cylinder, a spring is sleeved outside the first annular rod, one end of the spring is connected with the side wall of the sealing cylinder, and the other end of the spring is connected with the side wall of the mounting groove.

Preferably, the circumference of the outer side wall of the communicating pipe is provided with a spline, the spline is coated with a first elastic sealing layer, a second elastic sealing layer is sleeved on the first elastic sealing layer, and the inner ring surface of the second elastic sealing layer is provided with a spline groove corresponding to the spline; one end of the second elastic sealing layer is fixed on the outer barrel, and the other end of the second elastic sealing layer is in sealing and abutting joint with the inner wall of the second outer oil pipe.

Preferably, the outer surface of the first elastic sealing layer at the joint of two adjacent splines is provided with an inwards concave arc surface, the side wall of the first elastic sealing layer is tightly attached to the side wall of the spline groove, a first gap is formed between the top of the first elastic sealing layer and the spline groove, and a second gap is formed between the arc surface of the first elastic sealing layer and the spline groove.

The invention provides a using method of a sand control filling device, which comprises the following steps:

s100, placing a casing 7 and a slip hanger 6 in a well hole, and simultaneously forming a perforation 71 in an area to be filled with gravel mortar;

s200, lowering the sand-prevention filling device to be sealed on the slip hanger 6 in a setting mode, enabling the second annular cavity 20 to be located in an oil layer to be protected, and enabling the third annular cavity 30 to be located in the oil layer to be filled;

step S300, pressing to radially expand the packer 14, and sealing the second annular cavity 20 together with the slip hanger 6;

step S400, the rotating assembly 23 is in an initial state, and is communicated with a passage between the middle through cavity 50 and the third annular cavity 30, and simultaneously, a passage between the middle through cavity 50 and the liquid phase flow channel 52 in the central tube 5 is sealed;

s500, pumping gravel mortar into the middle through cavity 50 for filling;

step S600, after gravel mortar filling is finished, introducing high-pressure gas into the gas-phase flow channel 53 in the central pipe 5, rotating the rotating assembly 23 to enter a final state, sealing a passage between the middle through cavity 50 and the third annular cavity 30, and simultaneously communicating the passage between the middle through cavity 50 and the liquid-phase flow channel 52 in the central pipe 5;

step S700, pumping cleaning liquid into the liquid phase flow channel 52 of the central tube 5 to clean the middle through cavity 50;

and S800, taking out the sand prevention filling device after cleaning.

Compared with the prior art, the invention has the following beneficial technical effects:

1. the sand-proof packing device can form a first annular cavity, a second annular cavity and a third annular cavity which are mutually isolated with a casing, the third annular cavity is positioned in an area needing sand-proof packing, the second annular cavity is positioned in an area needing protection, sand-proof packing is realized through fluid circulation between the first annular cavity and the third annular cavity, and a non-packing area is protected through the second annular cavity;

2. the bottom of the sieve tube is connected with a guide shoe, on one hand, the guide shoe can play a role in protection and guide in the process of putting the sand control filling device into the casing, and on the other hand, the guide shoe and the sieve tube form a filtering structure for gravel mortar together;

3. the communication and the closing of the passage between the third annular cavity and the middle cavity are realized through the rotation of the rotating assembly; in the sand prevention filling process, a passage between the third annular cavity and the middle passage cavity is opened, and gravel is filled; when the filling is finished and the cleaning is carried out, a passage between the third annular cavity and the middle through cavity is closed, the pipe string is cleaned, the cleaning liquid directly flows back to the well head from the middle through cavity and cannot flow into the well hole, and the geology in the well hole is protected; meanwhile, the gravel mortar is directly reflowed from the through cavity during cleaning, so that the reflow efficiency is improved;

4. the double functions of driving the rotating assembly and completing cleaning can be realized by arranging the central pipe with double flow channels;

5. the communicating pipe is provided with a double-sealing structure consisting of a first elastic sealing layer and a second elastic sealing layer, so that the sealing property between the communicating pipe and the second outer oil pipe is further improved; the first gap and the second gap are arranged between the first elastic sealing layer and the second elastic sealing layer, so that the friction resistance of the communicating pipe during rotation can be reduced, and a buffer structure can be formed to reduce the impact force of gravel mortar on the communicating pipe;

in conclusion, the sand control filling device provided by the invention can protect the non-filling area while performing sand control filling, and when cleaning the pipe string, the cleaning liquid cannot be discharged into the well hole, so that the damage to the geology is reduced, and the sand control filling effect is improved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention after casing running;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is an exploded view of the first tubing assembly of FIG. 2;

FIG. 4 is an exploded view of the second tubing assembly of FIG. 2;

FIG. 5 is an enlarged view of a portion of A in FIG. 4;

FIG. 6 is a schematic view of the rotary assembly of FIG. 4;

FIG. 7 is a schematic view of the sleeve of FIG. 6;

FIG. 8 is a schematic structural view of the rotating mechanism of FIG. 6;

FIG. 9 is a schematic structural view of the filter screen of FIG. 4;

FIG. 10 is a schematic structural view of the center tube of FIG. 2;

fig. 11 is a side view of the communication pipe;

fig. 12 is a front view of the communication pipe.

Description of reference numerals:

1. a first oil pipe component, 2, a second oil pipe component, 3, a sieve pipe, 4, a guide shoe, 5, a central pipe, 6, a slip hanger, 7 and a sleeve,

10. a first annular cavity, 20, a second annular cavity, 30, a third annular cavity, 40, an annular flow cavity, 50, a central through cavity,

11. a first joint, 12, a first oil pipe, 13, a first connecting ring, 131, a first through hole, 14, a packer, 15, a second connecting ring, 151, a second through hole,

21. a second inner oil pipe 211, an annular sliding groove 212, an L-shaped flow passage 22, a second outer oil pipe 221, a third through hole 23, a rotating component 231, a sleeve 2311, an outer cylinder 2312, an inner cylinder 2313, an annular base 2314, an annular slider 2315, a mounting groove 2316, a communicating pipe 2317, a fourth through hole 232, a rotating driving mechanism 2321, a sealing cylinder 2322, an air hole 2323, a sealing plug, 2324, a first annular rod, 2325, a second annular rod, 2326, a limiting block, 2327, a spring, 2328, a first sealing cavity, 2329, a second sealing cavity, a

spline

233, 234, a first elastic sealing layer, 2341, a cambered surface, 2342, a first elastic sealing layer side wall, 235, a second elastic sealing layer, a spline groove 2351, a spline

groove side wall

2352, 236, a first gap 237, a second gap 24, a filter screen 241, a filter hole,

51. a central tube body 52, a liquid phase flow passage 53, a gas phase flow passage 54, a fifth through hole 55, a sixth through hole 56, an annular sleeve 57, a fourth annular cavity 58 and a gas tube,

71. and (6) perforating.

Detailed Description

The following description of the embodiments of the present invention refers to the accompanying drawings and examples:

it should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined by the following claims, and all modifications of the structures, changes in the proportions and adjustments of the sizes and other dimensions which are within the scope of the disclosure should be understood and encompassed by the present disclosure without affecting the efficacy and attainment of the same.

In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

With reference to the attached drawing 1, the sand control filling device is set in a casing 7 through a slip hanger 6 and comprises a first oil pipe assembly 1, a second oil pipe assembly 2, a sieve pipe 3 and a guide shoe 4 which are sequentially connected from top to bottom; the casing 7 and the sand-prevention filling device form a first annular cavity 10, a second annular cavity 20 and a third annular cavity 30 which are mutually isolated from top to bottom in sequence; the first oil pipe assembly 1 and the second oil pipe assembly 2 form an annular flow cavity 40 and a middle through cavity 50 with a closed bottom end together; one end of the circulation cavity 40 is communicated with the first annular cavity 10, and the other end is communicated with the third annular cavity 30; the upper end of the sieve tube 3 is communicated with the circulation cavity 40, the lower end of the sieve tube is connected with the guide shoe 4, the bottom of the guide shoe 4 is closed, and the sleeve 7 is provided with a perforation 71 at the third annular cavity 30.

In the technical scheme, gravel slurry is pumped into the sand control packing device through a slurry pump, the third annular cavity 30 is positioned in an area needing sand control packing, such as a lower high-pressure layer needing packing, the second annular cavity 20 is positioned in an area needing protection, such as an upper low-pressure layer needing no packing, the third annular cavity 30 receives gravel slurry injected from the middle through cavity 50, gravel in the gravel slurry is blocked in the third annular cavity 30 by the sieve tube 3 and is filled into a well hole through the perforation 71, slurry in the gravel slurry enters the sieve tube 3, flows back into the first annular cavity 10 through the circulation cavity 40, and finally flows back to a well head through the first annular cavity 10. The guide shoe 4 plays a role in protecting and guiding in the process of running the casing 7 into the sand control filling device, and forms a filtering structure for gravel mortar together with the sieve tube 3. After the filling is finished, the sand control filling tool is taken out and then enters the oil extraction process, and at the moment, the multilayer exploitation can be carried out only by opening a hole on the side wall of the casing 7 in the area of the second annular cavity 20.

In a specific embodiment, the second oil pipe assembly 2 is configured as follows, as shown in fig. 2 and 4, a rotating assembly 23 is arranged in the second oil pipe assembly 2, and the rotating assembly 23 is in rotating communication with or closes a passage between the third annular cavity 30 and the central cavity 50; the central pipe 5 with the closed bottom is fixedly arranged at the center of the bottom of the second oil pipe assembly 2, an air pipe 58 is radially arranged on the central pipe 5, and the air pipe 58 is communicated with the rotating assembly 23.

In the above technical solution, high-pressure gas is introduced into the rotating assembly 23 through the gas pipe 58 on the central pipe 5, the rotating assembly 23 is driven to rotate, and the communication and closing of the passage between the third annular cavity 30 and the central cavity 50 are realized through the rotation of the rotating assembly 23. During the sand control packing process, the rotating assembly 23 is located at the initial position, the passage between the third annular cavity 30 and the through cavity 50 is opened, and gravel slurry enters the third annular cavity 30 from the through cavity 50 to pack gravel; after filling is finished, the rotating assembly 23 rotates to the end position, at the moment, a passage between the third annular cavity 30 and the middle through cavity 50 is closed, the middle through cavity 50 becomes an independent cavity with a closed lower end, at the moment, cleaning liquid is pumped into the middle through cavity 50, gravel remained in the middle through cavity 50 flows back to a wellhead along with the cleaning liquid, and cleaning of the pipe string is completed, the cleaning liquid cannot enter the third annular cavity 30 in the process, and the problem that geology in a well hole becomes soft due to excessive water content caused by discharging of the cleaning liquid into the well hole is avoided; in addition, the gravel slurry directly flows back from the through cavity 50 during cleaning, and the backflow efficiency is improved.

In a specific embodiment, the technical solution of the first tubing assembly 1 is as follows, as shown in fig. 2 and 3, the first tubing assembly 1 comprises a first joint 11, a first tubing 12, a first connection ring 13, a packer 14 and a second connection ring 15 which are coaxially arranged; the outer diameter of the first oil pipe 12 is smaller than the inner diameters of the first connecting ring 13 and the packer 14, and the first connecting ring 13 and the packer 14 form an upper section of the annular flow cavity 40; the lower end of the first joint 11 is respectively in threaded connection with the first connecting ring 13 and the packer 14, and the upper end of the circulation cavity 40 is blocked; the first connecting ring 13 is provided with a first through hole 131 communicated with the first annular cavity 10; the upper end of the second connecting ring 15 is respectively connected with the first oil pipe 12 and the packer 14 in a threaded manner, the lower end of the second connecting ring is connected with the second oil pipe assembly 2, and the second connecting ring 15 is axially provided with a second through hole 151 communicated with the circulation cavity 40.

In the technical scheme, the first joint 11 plays a bearing role, the upper end of the first joint can be connected with an oil pipe, the middle through cavity 50 extends to a wellhead, the upper end of the circulation cavity 40 is simultaneously plugged, and slurry flowing back in the circulation cavity 40 enters the first annular cavity 10 through the first connecting ring 13 connected with the lower end of the circulation cavity; the first through holes 131 on the first connecting ring 13 can be arranged in a plurality of circles at equal intervals to improve the backflow efficiency; after the packer 14 is radially expanded, the annular space at the upper end and the lower end of the packer 14 can be sufficiently sealed and isolated, so that mud in the first annular cavity 10 does not enter the second annular cavity 20; the second connection ring 15 serves to receive and communicate the first oil pipe assembly 1 and the second oil pipe assembly 2 with each other and to communicate the upper section of the circulation chamber 40 located in the first oil pipe assembly 1 with the lower section of the circulation chamber 40 located in the second oil pipe assembly 2.

In a specific embodiment, the second oil pipe assembly 2 is implemented as follows, as shown in fig. 2 and 4, the second oil pipe assembly 2 includes a second inner oil pipe 21 and a second outer oil pipe 22 which are coaxially arranged, the lower end of the second inner oil pipe 21 is rotatably connected with the rotating assembly 23 in a sealing manner, the outer diameter of the second inner oil pipe 21 and the outer diameter of the rotating assembly 23 are smaller than the inner diameter of the second outer oil pipe 22, and the three together form the lower section of the circulation chamber 40; a third through hole 221 communicated with the circulation chamber 40 is formed in the side wall of the second outer oil pipe 22, a communicating pipe 2316 is formed in the side wall of the rotating assembly 23, one end of the communicating pipe 2316 is communicated with the middle through chamber 50, the other end of the communicating pipe 2316 is in sealing butt joint with the inner wall of the second outer oil pipe 22, and the communicating pipe is rotatably communicated with or staggered with the third through hole 221; the lower end face of the second outer oil pipe 22 is fixedly connected with a filter screen 24, the rotating assembly 23 is rotatably connected with the filter screen 24, the central pipe 5 is fixedly connected with the filter screen 24, the lower end of the filter screen 24 is connected with the sieve pipe 3, and the filter screen 24 is provided with filter holes 241 for communicating the circulation cavity 40 with the sieve pipe 3.

In the above technical solution, the rotating assembly 23 is arranged below the second inner oil pipe 21, and the preferable structure is that the outer diameter of the rotating assembly 23 is equal to the outer diameter of the second inner oil pipe 23, so that the flow passing gap of the second circulation cavity 40 is kept uniform and consistent, which is beneficial to reducing the backflow resistance; the screen 24 serves as a receiving and holding means for receiving the second tubing assembly 2 and the screen 3 on the one hand and for providing support for the installation of the base pipe 5 and the swivel assembly 23 on the other hand.

In order to further improve the sealing performance of the second annular cavity 20, a leather cup (not shown) may be disposed on the outer side wall of the second outer oil pipe 22, and the leather cup cooperates with the slip hanger 6 to sufficiently isolate the second annular cavity 20 from the third annular cavity 30, so as to prevent gravel slurry in the third annular cavity 30 from permeating into the second annular cavity 20.

In a specific embodiment, the second inner oil pipe 21 and the central pipe 5 together form an airflow path to provide a driving force for the rotating assembly 23, and as shown in fig. 5 and 10, an upper end surface of the second inner oil pipe 21 is in threaded connection with the first oil pipe assembly 1, a lower end surface is provided with an annular sliding chute 211, and an inner side wall of the second inner oil pipe 21 is provided with an L-shaped flow passage 212 communicated with the rotating assembly 23; the central tube 5 comprises the central tube body 51, a liquid phase flow passage 52 and a gas phase flow passage 53 are arranged in the central tube body 51, a fifth through hole 54 is formed in the outer side wall of the liquid phase flow passage 52, a sixth through hole 55 is formed in the outer side wall of the gas phase flow passage 53, an annular sleeve 56 is fixedly arranged on the outer circumference of the central tube body 51, a fourth annular cavity 57 is arranged in the annular sleeve 56, the fourth annular cavity 57 is communicated with the gas phase flow passage 53 through the sixth through hole 55, a gas pipe 58 is arranged on the outer annular wall of the annular sleeve 56, one end of the gas pipe 58 is communicated with the fourth annular cavity 57, and the other end of the gas pipe is communicated with the L-shaped flow passage 212.

In the above technical solution, the high-pressure gas is introduced from the gas phase flow channel 53 of the central tube body 51, enters the gas tube 58 through the fourth annular cavity 57 of the annular sleeve 56, and finally enters the rotating assembly 23 through the L-shaped flow channel 212 communicated with the gas tube 58 to drive the rotating assembly 23 to rotate. When cleaning is needed, high-pressure gas is introduced into the gas-phase flow passage 53 to drive the rotating assembly 23 to close the passage between the hollow cavity 50 and the circulating cavity 40, then cleaning liquid is pumped into the liquid-phase flow passage 52 on the central tube body 51, and the cleaning liquid enters the hollow cavity 50 through the fifth through hole 54 on the liquid-phase flow passage 52 to clean the hollow cavity 50. By providing the central tube 5 with a double flow path, the dual function of driving the rotating assembly 23 and performing the cleaning can be achieved.

In one embodiment, the rotating assembly 23 is configured as follows, as shown in fig. 6 to 8, the rotating assembly 23 includes a sleeve 231 and a rotating driving mechanism 232, the sleeve 231 includes an outer cylinder 2311 and an inner cylinder 2312 which are coaxially and alternately arranged and an annular base 2313 which connects the outer cylinder 2311 and the inner cylinder 2312, an annular slider 2314 and a mounting groove 2315 are arranged on an upper end surface of the outer cylinder 2311, the annular slider 2314 is inserted into the annular sliding groove 211 of the second inner oil pipe 21, the rotating driving mechanism 232 is arranged in the mounting groove 2315, an upper end surface of the rotating driving mechanism 232 is fixedly connected with a lower end surface of the second inner oil pipe 21, a lower end surface of the rotating driving mechanism 232 is rotatably connected with the mounting groove 2315, and the side wall of the outer cylinder 2311 is provided with the communicating pipe 2316; the inner cylinder 2312 is sleeved outside the central tube 5 in a sealing and rotating manner, and a fourth through hole 2317 is radially arranged on the side wall of the inner cylinder; in the initial state, the connection pipe 2316 on the second inner oil pipe 21 is communicated with the third through hole 221 on the second outer oil pipe 22.

Preferably, the rotation driving mechanism 232 includes a fan-shaped sealing cylinder 2321, an upper end surface of the sealing cylinder 2321 is fixedly connected to a lower end surface of the second inner oil pipe 21, an air hole 2322 is formed in the sealing cylinder 2321, the air hole 2322 communicates with the L-shaped flow passage 212 on the second inner oil pipe 21, a sealing plug 2323 is slidably disposed in the sealing cylinder 2321, a limiting block 2326 is disposed on the sealing plug 2323 and divides an inner cavity of the sealing cylinder 2321 into a first sealing cavity 2328 and a second sealing cavity 2329, the first sealing cavity 2328 communicates with the air hole 2322, two side walls of the sealing plug 2323 are respectively provided with a first annular rod 2324 and a second annular rod 2325, the first annular rod 2324 and the second annular rod 2325 sealingly and slidably penetrate through two side walls of the sealing cylinder 2321 and are respectively fixedly connected to two side walls of the mounting groove 2315 of the outer cylinder 2311, the first annular rod 2324 is externally sleeved with a spring 2327, one end of the spring 2327 is connected to the sidewall of the sealing cylinder 2321, and the other end is connected to the sidewall of the mounting groove 2315.

In the above technical solution, the outer cylinder 2311 of the sleeve 231 is in sealed rotatable connection with the second inner oil pipe 21, and simultaneously supports the rotation driving mechanism 232, the inner cylinder 2312 is in sealed rotatable connection with the center pipe body 51, and the annular base 2313 seals an annular space formed by the outer cylinder 2311 and the inner cylinder 2312.

In an initial state, the stopper 2326 on the piston 2323 abuts against a side wall of the seal cylinder 2321 penetrated by the first annular rod 2324, the spring 2327 is in a naturally extended state, and when high-pressure gas is introduced into the first seal chamber 2328 of the seal cylinder 2321, the piston 2323 slides in the direction of the second seal chamber 2329 by the gas pressure, the first annular rod 2324 contracts into the seal cylinder 2321, the spring 2327 is compressed, the second annular rod 2325 extends out of the seal cylinder 2321, and the sleeve 231 rotates by being pushed by the first annular rod 2324 and the second annular rod 2325.

In the gravel slurry filling process, the communication pipe 2316 on the outer cylinder 2311 is communicated with the third through hole 221 on the second outer oil pipe 22, the gravel slurry enters the third annular cavity 30 through the communication pipe 2316, the fourth through hole 2317 on the inner cylinder 2312 is staggered with the fifth through hole 54 on the liquid phase flow passage 52 of the central pipe 5, and the fifth through hole 54 is blocked by the inner cylinder 2312.

In the cleaning process, the sleeve 231 is driven by the rotation driving mechanism 232 to rotate, the connection pipe 2316 on the outer cylinder 2311 is staggered with the third through hole 221 on the second outer oil pipe 22, the second outer oil pipe 22 plugs the connection pipe 2316, and the fourth through hole 2317 on the inner cylinder 2312 is communicated with the fifth through hole 54 on the liquid phase flow passage 52 of the center pipe 5.

In a specific embodiment, a double sealing structure is provided on the communication pipe 2316, and in a specific technical scheme, as shown in fig. 11 and 12, a spline 233 is provided on the circumference of the outer side wall of the communication pipe 2316, the spline 233 is coated with a first elastic sealing layer 234, a second elastic sealing layer 235 is sleeved on the first elastic sealing layer 234, and a spline groove 2351 corresponding to the spline 233 is provided on the inner ring surface of the second elastic sealing layer 235; one end of the second elastic sealing layer 235 is fixed on the outer cylinder 2311, and the other end of the second elastic sealing layer is in sealing abutting joint with the inner wall of the second outer oil pipe 22.

Preferably, an inner concave arc surface 2341 is arranged on the outer surface of the first elastic sealing layer 234 at the joint of two adjacent splines 233, the first elastic sealing layer side wall 2342 is tightly attached to the spline groove side wall 2352, a first gap 236 is formed between the top of the first elastic sealing layer 234 and the spline groove 2351, and a second gap 237 is formed between the arc surface 2341 of the first elastic sealing layer 234 and the spline groove 2351.

Among the above-mentioned technical scheme, the leakproofness between communicating pipe 2316 and the second outer oil pipe 22 can further be improved to double seal structure, set up spline 233 on the lateral wall of communicating pipe 2316, can improve the stability of being connected of communicating pipe 2316 and first elastic sealing layer 234 and second elastic sealing layer 235, avoid taking place relative slip between the two and communicating pipe 2316, set up first space 236 and second space 237 between first elastic sealing layer 234 and the second elastic sealing layer 235, on the one hand can reduce the frictional resistance when communicating pipe 2316 rotates, on the other hand can form buffer structure, reduce the impact force of gravel mortar to communicating pipe 2316.

s500, pumping gravel mortar into the middle through cavity 50 for filling;

and S800, taking out the sand prevention filling device after cleaning.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.

Claims

1. A sand control filling device is set in a casing (7) through a slip hanger (6), and is characterized by comprising a first oil pipe component (1), a second oil pipe component (2), a sieve pipe (3) and a guide shoe (4) which are sequentially connected from top to bottom; the casing (7) and the sand-prevention filling device form a first annular cavity (10), a second annular cavity (20) and a third annular cavity (30) which are isolated from each other in sequence from top to bottom; the first oil pipe assembly (1) and the second oil pipe assembly (2) jointly form an annular flow cavity (40) and a middle through cavity (50) with a closed bottom end; one end of the circulation cavity (40) is communicated with the first annular cavity (10), and the other end of the circulation cavity is communicated with the third annular cavity (30); the upper end of the sieve tube (3) is communicated with the circulation cavity (40), the lower end of the sieve tube is connected with the guide shoe (4), the bottom of the guide shoe (4) is closed, and a perforation (71) is formed in the third annular cavity (30) of the sleeve (7); a rotating assembly (23) is arranged in the second oil pipe assembly (2), and the rotating assembly (23) is in rotating communication with or closes a passage between the third annular cavity (30) and the middle through cavity (50); the bottom-closed central pipe (5) is fixedly arranged at the bottom center of the second oil pipe assembly (2), an air pipe (58) is radially arranged on the central pipe (5), and the air pipe (58) is communicated with the rotating assembly (23).

2. The sand control packing device according to claim 1, wherein the first tubing assembly (1) comprises a first joint (11), a first tubing (12), a first connection ring (13), a packer (14) and a second connection ring (15) which are coaxially arranged; the outer diameter of the first oil pipe (12) is smaller than the inner diameters of the first connecting ring (13) and the packer (14), and the first connecting ring, the first connecting ring and the packer form an upper section of the annular flow cavity (40); the lower end of the first joint (11) is respectively in threaded connection with the first connecting ring (13) and the packer (14) and blocks the upper end of the annular flow cavity (40); a first through hole (131) communicated with the first annular cavity (10) is formed in the first connecting ring (13); the upper end of the second connecting ring (15) is respectively in threaded connection with the first oil pipe (12) and the packer (14), the lower end of the second connecting ring is connected with the second oil pipe assembly (2), and a second through hole (151) communicated with the circulation cavity (40) is axially formed in the second connecting ring (15).

3. The sand control packing device according to claim 2, wherein the second tubing assembly (2) comprises a second inner tubing (21) and a second outer tubing (22) which are coaxially arranged, the lower end of the second inner tubing (21) is rotatably connected with the rotating assembly (23) in a sealing way, the outer diameter of the second inner tubing (21) and the outer diameter of the rotating assembly (23) are smaller than the inner diameter of the second outer tubing (22), and the three together form the lower section of the circulation chamber (40); a third through hole (221) communicated with the circulation cavity (40) is formed in the side wall of the second outer oil pipe (22), a communicating pipe (2316) is formed in the side wall of the rotating assembly (23), one end of the communicating pipe (2316) is communicated with the middle through cavity (50), the other end of the communicating pipe (2316) is in sealing butt joint with the inner wall of the second outer oil pipe (22), and the communicating pipe can be rotatably communicated with or staggered from the third through hole (221); the end face fixed connection filter screen (24) under second outer oil pipe (22), rotating assembly (23) with filter screen (24) rotatable coupling, center tube (5) with filter screen (24) fixed connection, the lower extreme of filter screen (24) is connected sieve pipe (3), be equipped with the intercommunication on filter screen (24) circulation chamber (40) with filtration pore (241) of sieve pipe (3).

4. The sand control packing device according to claim 3, characterized in that the upper end surface of the second inner oil pipe (21) is in threaded connection with the first oil pipe assembly (1), the lower end surface is provided with an annular sliding chute (211), and the inner side wall of the second inner oil pipe (21) is provided with an L-shaped flow passage (212) communicated with the rotating assembly (23); the central tube (5) comprises a central tube body (51), a liquid phase flow channel (52) and a gas phase flow channel (53) are arranged inside the central tube body (51), a fifth through hole (54) is formed in the outer side wall of the liquid phase flow channel (52), a sixth through hole (55) is formed in the outer side wall of the gas phase flow channel (53), an annular sleeve (56) is fixedly arranged on the outer circumference of the central tube body (51), a fourth annular cavity (57) is arranged in the annular sleeve (56), the fourth annular cavity (57) is communicated with the gas phase flow channel (53) through the sixth through hole (55), an air tube (58) is arranged on the outer annular wall of the annular sleeve (56), one end of the air tube (58) is communicated with the fourth annular cavity (57), and the other end of the air tube is communicated with the L-shaped flow channel (212).

5. The sand control packing device of claim 4, wherein the rotating assembly (23) comprises a sleeve (231) and a rotary drive mechanism (232), the sleeve (231) comprises an outer cylinder (2311) and an inner cylinder (2312) which are coaxial and arranged at intervals, and an annular base (2313) for connecting the outer cylinder (2311) and the inner cylinder (2312), the upper end surface of the outer cylinder (2311) is provided with an annular slide block (2314) and a mounting groove (2315), the annular slide block (2314) is inserted into the annular slide groove (211) of the second inner oil pipe (21), the rotary driving mechanism (232) is arranged in the mounting groove (2315), the upper end face of the rotary driving mechanism (232) is fixedly connected with the lower end face of the second inner oil pipe (21), the lower end face of the rotary driving mechanism is rotatably connected with the mounting groove (2315), and the communicating pipe (2316) is arranged on the side wall of the outer cylinder (2311); the inner cylinder (2312) is sleeved outside the central pipe (5) in a sealing and rotating mode, and a fourth through hole (2317) is formed in the side wall of the inner cylinder in the radial direction; in an initial state, a communicating pipe (2316) on the second inner oil pipe (21) is communicated with a third through hole (221) on the second outer oil pipe (22).

6. The sand control packing device according to claim 5, wherein the rotary driving mechanism (232) comprises a fan-shaped sealing cylinder (2321), the upper end face of the sealing cylinder (2321) is fixedly connected to the lower end face of the second inner oil pipe (21), an air hole (2322) is formed in the sealing cylinder (2321), the air hole (2322) is communicated with the L-shaped flow passage (212) in the second inner oil pipe (21), a sealing plug (2323) is slidably arranged in the sealing cylinder (2321), a limiting block (2326) is arranged on the sealing plug (2323) and divides the inner cavity of the sealing cylinder (2321) into a first sealing cavity (2328) and a second sealing cavity (2329), the first sealing cavity (2328) is communicated with the air hole (2322), a first annular rod (2324) and a second annular rod (2325) are respectively arranged on two side walls of the sealing plug (2323), and the first annular rod (2324) and the second annular rod (2325) are sealed and slidably passed through the sealing cylinder (2321) ) The first annular rod (2324) is externally sleeved with a spring (2327), one end of the spring (2327) is connected with the side wall of the sealing cylinder (2321), and the other end of the spring (2327) is connected with the side wall of the mounting groove (2315).

7. The sand control filling device according to claim 6, wherein a spline (233) is arranged on the circumference of the outer side wall of the communicating pipe (2316), a first elastic sealing layer (234) is wrapped on the spline (233), a second elastic sealing layer (235) is sleeved on the first elastic sealing layer (234), and a spline groove (2351) corresponding to the spline (233) is arranged on the inner ring surface of the second elastic sealing layer; one end of the second elastic sealing layer (235) is fixed on the outer cylinder (2311), and the other end of the second elastic sealing layer is in sealing abutting joint with the inner wall of the second outer oil pipe (22).

8. The sand control packing device according to claim 7, wherein an inner concave cambered surface (2341) is arranged on the outer surface of the first elastic sealing layer (234) at the joint of two adjacent splines (233), the first elastic sealing layer side wall (2342) is tightly attached to the spline groove side wall (2352), a first gap (236) is formed between the top of the first elastic sealing layer (234) and the spline groove (2351), and a second gap (237) is formed between the cambered surface (2341) of the first elastic sealing layer (234) and the spline groove (2351).

9. The method of using a sand control packing device according to any one of claims 6 to 8, comprising the steps of:

s100, placing a casing (7) and a slip hanger (6) in a well hole, and simultaneously forming a perforation (71) in an area to be filled with gravel slurry;

s200, lowering the sand-prevention filling device to be sealed on the slip hanger (6) in a setting mode, enabling the second annular cavity (20) to be located in an oil layer to be protected, and enabling the third annular cavity (30) to be located in the oil layer to be filled;

s300, pressing to radially expand the packer (14) and seal a second annular cavity (20) together with the slip hanger (6);

s400, the rotating assembly (23) is located in an initial state, a passage between the middle through cavity (50) and the third annular cavity (30) is communicated, and a passage between the middle through cavity (50) and the liquid phase flow channel (52) in the central pipe (5) is closed;

s500, pumping gravel mortar into the middle through cavity (50) and filling;

step S600, after gravel mortar is filled, introducing high-pressure gas into a gas-phase flow channel (53) in the central pipe (5), rotating the rotating assembly (23) to enter a final state, sealing a passage between the middle through cavity (50) and the third annular cavity (30), and simultaneously communicating the passage between the middle through cavity (50) and a liquid-phase flow channel (52) in the central pipe (5);

s700, pumping cleaning liquid into a liquid phase flow channel (52) of a central pipe (5) to clean a middle through cavity (50);

and S800, taking out the sand prevention filling device after cleaning.