CN114183076A

CN114183076A - Hydraulic jet drilling pipe column and hydraulic jet drilling method

Info

Publication number: CN114183076A
Application number: CN202010964943.1A
Authority: CN
Inventors: 孔凡楠; 于广刚; 胡胜勇; 张曦宇; 王文钢; 张洪志; 苗春旭; 张升峰; 温海波; 杨雨潇; 韩菁华; 高依然; 贾纯真; 卢潇; 赵云峰
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2022-03-15
Anticipated expiration: 2040-09-15
Also published as: CN114183076B

Abstract

The invention provides a hydraulic jet drilling string and a hydraulic jet drilling method, wherein the hydraulic jet drilling string comprises an outer string and an inner string arranged in the outer string; the outer pipe column comprises an outer pipe body and a guider, and a first step and a second step which are distributed from bottom to top are arranged on the inner wall of the outer pipe body; the inner tubular string includes: the oil pipe comprises a nozzle, an injection rubber pipe, a motion conversion mechanism, a first butt joint pipe, a second butt joint pipe and an inner pipe column descending oil pipe, wherein the motion conversion mechanism comprises a pin shaft spring, a conversion pipe body connected to the upper end of the injection rubber pipe and a positioning limit pin shaft arranged on the conversion pipe body; the first butt joint pipe is connected to the upper end of the conversion pipe body, the second butt joint pipe can be spliced with the first butt joint pipe and communicated, and the inner pipe column lower oil inlet pipe is connected to the upper end of the second butt joint pipe and fixedly connected through the shearing pin. The invention solves the technical problems of high running difficulty of the drilling pipe column, more operation links and high operation cost in the hydraulic jet drilling operation.

Description

Hydraulic jet drilling pipe column and hydraulic jet drilling method

Technical Field

The invention relates to the field of oil extraction in oil fields, in particular to a hydraulic jet drilling pipe column and a hydraulic jet drilling method.

Background

The hydraulic jet drilling technology is a production increasing process, and is characterized by that firstly, the underground specified layer position sleeve pipe is windowed, then the drilling pipe column can be used for forming long-distance radial hole on the stratum through said window, so that it can directly and effectively communicate with far-end crack of reservoir stratum or near-wellbore zone of wellbore to implement unblocking, and can raise permeability of production layer so as to make residual oil between wells obtain use to implement production increasing and efficiency increasing. The hydraulic jet drilling technology can be applied to the field of low-permeability oilfield development, such as geological exploration, oil well production increase, steam injection and water injection effect improvement and the like.

The hydraulic jet drilling mainly comprises casing windowing and stratum drilling, underground drilling can be carried out in a pure water jet mode, and the problem that the rock breaking effect of various underground reservoir lithological characters is difficult to meet due to the limited rock breaking capacity of pure water exists; meanwhile, the windowing mode can adopt a mode of mechanically drilling and milling the casing, and the technical problem of low windowing success rate exists. As an improvement on the hydraulic jet drilling technology, the abrasive hydraulic jet drilling technology is provided, namely, the abrasive is added into high-pressure water jet fluid, so that the rock breaking capacity of the water jet fluid under unit pressure is improved.

The abrasive hydraulic jet drilling technology mainly comprises casing windowing and stratum drilling, wherein the casing windowing and the stratum drilling are usually implemented step by step, and a drilling pipe column is put into the casing windowing and the stratum drilling after the casing windowing is finished. The lower end of the lowered drilling pipe column comprises a high-pressure rubber pipe with the thickness of 15 m-100 m, the high-pressure rubber pipe is weak in rigidity, the lowering difficulty of the drilling pipe column is high for the oil well pipe column with the thickness of 2000 m-3000 m, and the drilling pipe column cannot be lowered due to blocking in the oil well pipe column. In addition, casing windowing and stratum drilling are performed step by step, and the technical problems of high operation cost, multiple operation links, long construction period, poor stability of a process pipe column and the like exist.

Disclosure of Invention

The invention aims to provide a hydraulic jet drilling pipe column and a hydraulic jet drilling method, which are used for relieving the technical problems of high running difficulty of the drilling pipe column, more operation links and high operation cost in hydraulic jet drilling operation.

The above object of the present invention can be achieved by the following technical solutions:

the invention provides a hydraulic jet drilling string, comprising: the outer pipe column and the inner pipe column are arranged in the outer pipe column;

the outer tubing string comprises:

the inner wall of the outer pipe body is provided with a first step and a second step which are distributed from bottom to top;

the guider is connected to the lower end of the outer pipe body and is provided with a rubber pipe advancing channel;

the inner tubular string includes:

a nozzle;

the spraying rubber tube can move in the rubber tube advancing channel, and the nozzle is connected to the lower end of the spraying rubber tube;

the motion conversion mechanism comprises a pin shaft spring, a conversion pipe body connected to the upper end of the injection rubber pipe and a positioning limit pin shaft arranged on the conversion pipe body, the conversion pipe body is arranged between the first step and the second step, and the conversion pipe body can cross the first step and can be blocked by the second step; the pin spring is connected with the positioning and limiting pin shaft, so that the positioning and limiting pin shaft has the tendency of extending outwards to prevent the motion conversion mechanism from crossing the first step; the positioning and limiting pin shaft can contract inwards under the condition that sand slurry is introduced into the conversion pipe body;

the first butt joint pipe is connected to the upper end of the conversion pipe body;

the second pair of connecting pipes can be spliced with the first pair of connecting pipes and are communicated with each other;

and an inner pipe column is arranged in the oil inlet pipe, and the inner pipe column is connected to the upper end of the second butt joint pipe and fixedly connected through a shearing pin.

In a preferred embodiment, the conversion pipe body is provided with a pipe body channel and a pin shaft piston cavity, the upper end of the pipe body channel is communicated with the first butt joint pipe, and the lower end of the pipe body channel is communicated with the injection rubber pipe; the pin shaft piston cavity is communicated with the pipe body channel, and the positioning and limiting pin shaft is arranged in the pin shaft piston cavity.

In a preferred embodiment, a filter screen is arranged between the pin piston cavity and the pipe channel.

In a preferred embodiment, the first butt joint pipe is provided with a first inserting hole and a second inserting hole which are distributed from top to bottom, and the inner diameter of the first inserting hole is smaller than that of the second inserting hole; the second butt joint pipe is provided with a plug connector, the plug connector can contract inwards to cross the first plug hole, and the plug connector can be clamped in the second plug hole.

In a preferred embodiment, the first butt joint pipe is provided with a sealing hole located above the first plug hole, the second butt joint pipe is provided with a sealing column located above the plug, and the side wall of the sealing column is provided with a sealing ring capable of being matched with the inner wall of the sealing hole.

In a preferred embodiment, a first centralizer is connected between the first adapter tube and the switching tube body.

In a preferred embodiment, the first centralizer comprises a centralizing pipe body, a centralizing spring and a plurality of centralizing blocks, and two ends of the centralizing pipe body are respectively connected with the first butt joint pipe and the conversion pipe body; the centralizing block is connected to the centralizing pipe body and can move along the radial direction of the centralizing pipe body, and a plurality of centralizing pipe bodies are distributed around the periphery of the centralizing pipe body; the centering spring is connected with the centering block and can drive the centering block to move outwards to be abutted against the outer tubular column.

In a preferred embodiment, a second centralizer is arranged between the second butt joint pipe and the inner pipe column lower oil inlet pipe.

In a preferred embodiment, the lower end of the inner tubular column running oil pipe is connected with a running oil pipe lower joint, the upper end of the second butt joint pipe is connected with a disconnecting joint, and the running oil pipe lower joint can be inserted into the disconnecting joint; the shearing pin is arranged along the radial direction of the disconnecting joint and is connected with the lower joint of the lower oil pipe and the disconnecting joint.

In a preferred embodiment, the outer pipe body comprises a butt joint outer pipe, an ascending limit coupling, a tool positioning coupling and a rubber pipe outer pipe which are sequentially distributed from top to bottom, and the guider is connected to the lower end of the rubber pipe outer pipe; the first step is arranged between the tool positioning coupling and the rubber tube outer tube, and the second step is arranged between the ascending limiting coupling and the tool positioning coupling.

In a preferred embodiment, the outer tubular string comprises a guide housing connected to the lower end of the outer tubular body, the guide housing being provided with a radially penetrating through slot, the guide being fixedly arranged in the through slot.

The invention provides a hydraulic jet drilling method, which adopts the hydraulic jet drilling pipe column and comprises the following steps:

a step S10 of attaching the nozzle, the jet hose, the motion conversion mechanism, and the first adapter tube to the outer string;

step S20, lowering the outer pipe column to a specified stratum;

step S30, sequentially lowering the second butt joint pipe and the inner tubular column lowering oil pipe to enable the second butt joint pipe to be spliced and communicated with the first butt joint pipe;

step S40, introducing sand slurry into the inner pipe column, enabling the positioning limiting pin shaft to contract inwards by the sand slurry entering the conversion pipe body, and meanwhile, ejecting the sand slurry outwards through the nozzle to window the sleeve;

and step S50, pushing the inner pipe column to move downwards, and enabling the nozzle to enter the stratum through the window for drilling.

In a preferred embodiment, the hydrajet drilling method comprises: step S60, lifting the inner pipe column to keep the inner pipe column in a stretching state; step S60 is provided between step S30 and step S40.

The invention has the characteristics and advantages that:

by using the hydraulic jet drilling string, the outer string and the inner string can be put into a specified stratum, then casing windowing is carried out, and then stratum drilling is carried out.

When the pipe column is lowered, the first butt joint pipe, the motion conversion mechanism, the nozzle and the jet rubber pipe in the inner pipe column can be arranged in the outer pipe column and lowered into a specified stratum along with the outer pipe column; then, an inner pipe column in the inner pipe column is lowered into the oil pipe, a second butt joint pipe is lowered into the outer pipe column, and the inner pipe column is in butt joint with the first butt joint pipe to complete assembly of the inner pipe column; and then, introducing sand slurry into the inner pipe column, windowing the casing pipe, and then drilling the stratum.

The length of an inner pipe column running oil pipe in the inner pipe column is longer, and in the hydraulic jet drilling pipe column, the inner pipe column running oil pipe and an outer pipe column can be separately run; in the process of putting the inner pipe column into the oil pipe and putting the inner pipe column into the oil pipe, the inner pipe column can be in butt joint with the first butt joint pipe, the motion conversion mechanism, the nozzle and the injection rubber pipe which are put into the inner pipe column, so that the inner pipe column and the outer pipe column can be conveniently and smoothly put into a specified stratum.

The jet rubber pipe is weak in rigidity, and in the hydraulic jet drilling pipe column, the jet rubber pipe and the nozzle are put into the outer pipe column together, so that the situation that the jet rubber pipe cannot be put into the outer pipe column due to blockage can be reduced.

In the process of butt joint of the second butt joint pipe and the first butt joint pipe, the positioning limit pin shaft in the motion conversion mechanism is in an extending state, the motion conversion mechanism can be prevented from passing through the first step, the first step provides upward supporting force for the motion conversion mechanism and the first butt joint pipe, impact force generated by butt joint acts on the positioning limit pin shaft and the first step, and butt joint of the second butt joint pipe and the first butt joint pipe can be guaranteed to be completed smoothly.

After the casing is windowed, the inner tubular column needs to move downwards, so that the nozzle enters the stratum through the windowed window to drill. When the hydraulic jet drilling string is used for casing windowing and stratum drilling, sand slurry is introduced into the inner string, flows through the motion conversion mechanism, and enables the positioning limiting pin to contract inwards in the axial direction.

In the process of windowing, the positioning and limiting pin shaft is in a contraction state under the action of the sand slurry, but the switching pipe body can be blocked by the second step, so that the motion switching mechanism can be blocked from moving upwards, the motion switching mechanism is limited on the second step, pre-tightening force required by windowing is provided for the inner pipe column, and the position of the nozzle is kept stable.

After drilling is finished, stopping introducing the sand slurry, enabling the positioning limiting pin shaft to extend outwards, and limiting the motion conversion mechanism, the nozzle and the injection rubber pipe below a second step as the conversion pipe body can be blocked by the second step; lifting the inner pipe column, shearing a shearing pin between the lower oil inlet pipe of the inner pipe column and the second butt joint pipe, separating the lower oil inlet pipe of the inner pipe column from the second butt joint pipe, and continuously lifting to lift the lower oil inlet pipe of the inner pipe column out; and lifting the outer pipe column and taking out the hydraulic jet drilling pipe column. By adopting the pulling-out mode, the pulling-out operation of the tubular column can be conveniently and smoothly completed.

The hydraulic jet drilling string avoids the operation mode that the drilling string is put in after the casing windowing is finished, but the operation of putting the string in is finished firstly, then the casing windowing and the stratum drilling are carried out, the operation of putting the string in and the operation of pulling the string out can be finished smoothly, and the technical problems of large putting difficulty of the drilling string in the hydraulic jet drilling operation, more operation links and high operation cost are solved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a first embodiment of a hydrajet drilling string provided in accordance with the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a partial enlarged view of fig. 1 at B;

FIG. 4 is an enlarged view of a portion of FIG. 1 at C;

FIG. 5 is a schematic diagram of the configuration of a motion conversion mechanism in the hydrajet drillstring shown in FIG. 1;

FIG. 6 is a schematic, partly schematic structural view of an inner tubular string in a second embodiment of a hydrajet drilling string provided in accordance with the present invention;

FIG. 7 is a schematic structural view of the upper half of the hydrajet drilling string of FIG. 1 in a run-in condition;

FIG. 8 is a schematic diagram of the lower half of the hydrajet drilling string of FIG. 1 in a run-in condition;

FIG. 9 is a schematic structural view of the upper half of the hydrajet drilling string of FIG. 1 in an abutting configuration;

FIG. 10 is a schematic diagram of the lower half of the hydrajet drilling string of FIG. 1 in an abutting configuration;

FIG. 11 is a schematic structural view of the upper half of the hydrajet drilling string of FIG. 1 in a windowed state;

FIG. 12 is a schematic structural view of the lower half of the hydrajet drilling string of FIG. 1 in a windowed state;

FIG. 13 is a schematic structural view of the upper half of the hydrajet drilling string of FIG. 1 in a drilling configuration;

FIG. 14 is a schematic diagram of the lower half of the hydrajet drilling string of FIG. 1 in a drilling configuration;

FIG. 15 is a schematic structural view of the upper half of the hydrajet drilling string of FIG. 1 in a disengaged condition;

FIG. 16 is a schematic diagram of the lower half of the hydrajet drilling string of FIG. 1 in a disengaged state;

FIG. 17 is a cross-sectional view of a guide housing in the hydrajet drilling string shown in FIG. 1;

FIG. 18 is a cross-sectional view taken along line D-D of FIG. 17;

fig. 19 is a schematic diagram of a hydrajet drilling method provided by the present invention.

The reference numbers illustrate:

1. an outer tubing string; 3. from bottom to top;

10. an outer tubular body; 11. a first step; 12. a second step;

20. butting an outer pipe; 21. an upward limit coupling; 22. positioning a coupling by a tool; 23. a hose outer tube;

30. a guide; 302. a snap-in guide; 301. a hose advancing passage;

31. a guide housing; 311. a through groove;

32. the guider upper joint; 33. a rubber tube guide ring; 34. a guide limiting ring; 35. the guider positions the centralizing joint;

2. an inner tubular column;

40. a nozzle; 41. spraying a rubber tube;

50. a motion conversion mechanism;

51. converting the tube body; 511. a tube body passage; 512. a pin piston cavity;

52. positioning a limiting pin shaft; 521. a small diameter part; 522. a large diameter portion;

53. a pin spring; 54. a pin shaft fixing ring; 55. a filter screen;

61. a first docking pipe; 611. a first plug hole; 612. a second plug hole; 613. sealing the hole;

62. a second pair of adapter tubes; 621. a plug-in connector; 622. sealing the column; 623. a seal ring;

70. the inner pipe column is put into an oil pipe; 71. shearing the pin; 72. a lower joint of the oil pipe is put in; 73. disconnecting the joint;

81. a first centralizer; 811. righting the pipe body; 812. a righting block; 813. a centering spring; 814. righting the upper ring; 815. righting the lower ring;

82. a second centralizer; 83. and butting the transition pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

The present invention provides a hydraulic jet drilling string, as shown in fig. 1 to 4, comprising: the outer pipe column 1 and the inner pipe column 2 arranged in the outer pipe column 1; the outer tubing string 1 comprises: the inner wall of the outer tube body 10 is provided with a first step 11 and a second step 12 which are distributed along the direction 3 from bottom to top; the guider 30 is connected to the lower end of the outer tube body 10 and is provided with a rubber tube advancing channel 301; the inner tubular string includes: the nozzle 40, the injection rubber pipe 41, the motion conversion mechanism 50, the first connecting pipe 61, the second connecting pipe 62 and the inner tubular column descending oil pipe 70; the injection rubber tube 41 is arranged in the rubber tube advancing channel 301 and can move in the rubber tube advancing channel 301, and the nozzle 40 is connected to the lower end of the injection rubber tube 41; the motion conversion mechanism 50 comprises a pin spring 53, a conversion pipe body 51 connected to the upper end of the injection rubber pipe 41 and a positioning limit pin 52 arranged on the conversion pipe body 51, wherein the conversion pipe body 51 is arranged between the first step 11 and the second step 12, and the conversion pipe body 51 can cross the first step 11 and can be blocked by the second step 12; the pin spring 53 is connected with the positioning limit pin 52, so that the positioning limit pin 52 has a tendency of extending outwards to block the motion conversion mechanism 50 from passing through the first step 11; the positioning limit pin shaft 52 can contract inwards under the condition that sand slurry is introduced into the conversion pipe body 51; the first butt pipe 61 is connected to the upper end of the switching pipe body 51; the second connecting pipe pair 62 can be spliced with and communicated with the first connecting pipe pair 61; an inner string running oil pipe 70 is connected to the upper end of the second docking pipe 62 and is secured by shear pins 71.

By using the hydraulic jet drilling string, the outer string 1 and the inner string can be put into a specified stratum, then casing windowing is carried out, and then stratum drilling is carried out.

As shown in fig. 7 and 8, when the string is lowered, the first joint pipe 61, the motion conversion mechanism 50, the nozzle 40, and the injection rubber hose 41 in the inner string may be first installed in the outer string 1 and lowered into a specified formation together with the outer string 1; then, as shown in fig. 9 and 10, an inner tubular string of the inner tubular string is lowered into the oil pipe 70 and the second butt pipe 62 into the outer tubular string 1, and is butted with the first butt pipe 61, completing the assembly of the inner tubular string; as shown in fig. 11 and 12, sand slurry is then pumped into the inner string 2, casing windowing is performed, and formation drilling is then performed as shown in fig. 13 and 14.

The length of the inner pipe column running oil pipe 70 in the inner pipe column 2 is determined according to the well depth to be operated, and is usually longer, in the hydraulic jet drilling pipe column, the inner pipe column running oil pipe 70 and the outer pipe column 1 can be separately run; in the process of running the inner pipe column into the oil pipe 70, the inner pipe column can be butted with the first butting pipe 61, the motion conversion mechanism 50, the nozzle 40 and the injection rubber pipe 41 which are already run, so that the inner pipe column and the outer pipe column 1 can be conveniently and smoothly run into a specified stratum.

The rigidity of the injection rubber pipe 41 is weak, and in the hydraulic injection drilling string, the injection rubber pipe 41 and the nozzle 40 are put into the outer string 1 together, so that the situation that the injection rubber pipe cannot be put into the outer string due to blockage can be reduced.

In the process of butting the second butting pipe 62 and the first butting pipe 61, the positioning limit pin 52 in the motion conversion mechanism 50 is in an extending state, so that the motion conversion mechanism 50 can be prevented from passing through the first step 11, the first step 11 provides upward supporting force for the motion conversion mechanism 50 and the first butting pipe 61, and impact force generated by butting acts on the positioning limit pin 52 and the first step 11, so that the second butting pipe 62 and the first butting pipe 61 can be ensured to be butted smoothly.

After the casing is windowed, the inner string needs to be moved downward so that the nozzle 40 enters the formation through the windowed window for drilling. When the hydraulic jet drilling string is used for casing windowing and stratum drilling, sand slurry is introduced into the inner string, the sand slurry flows through the motion conversion mechanism 50, the positioning limit pin shaft 52 is enabled to contract inwards, the conversion pipe body 51 in the motion conversion mechanism 50 can cross the first step 11, so that the motion conversion mechanism 50 can downwards cross the first step 11, at the moment, the descending state of the inner string 2 is opened, and the inner string can downwards move to enable the nozzle 40 to enter the stratum through the windowed window, so that stratum drilling can be smoothly carried out.

In the process of windowing, the positioning and limiting pin shaft 52 is in a contracted state under the action of the sand slurry, but the switching tube body 51 can be blocked by the second step 12, so that the motion switching mechanism 50 can be blocked from moving upwards, the motion switching mechanism 50 is limited on the second step 12, pre-tightening force required by windowing is provided for the inner tubular column 2, and the position of the nozzle 40 is kept stable.

After the drilling is finished, the nozzle 40 and the injection rubber tube 41 retract to a running-in state; stopping introducing the sand slurry, enabling the positioning and limiting pin shaft 52 to extend outwards, and limiting the motion conversion mechanism 50, the nozzle 40 and the injection rubber pipe 41 below the second step 12 because the conversion pipe body 51 can be blocked by the second step 12; lifting the inner pipe column, shearing the shearing pin 71 between the inner pipe column lowering oil pipe 70 and the second butt joint pipe 62, separating the inner pipe column lowering oil pipe 70 from the second butt joint pipe 62, and continuously lifting to lift the inner pipe column lowering oil pipe 70; and lifting the outer pipe column 1 and pulling out the hydraulic jet drilling pipe column. By adopting the pulling-out mode, the pulling-out operation of the tubular column can be conveniently and smoothly completed.

As shown in fig. 1 and 4, the lower end of the hose advancing passage 301 may extend laterally, and the injection hose 41 may move in the hose advancing passage 301. The lower end of the rubber tube advancing channel 301 is provided with a third step, the nozzle 40 is provided with a fourth step matched with the third step, and the fourth step is clamped on the third step, so that the nozzle 40 can be prevented from moving into the rubber tube advancing channel 301 to position the nozzle 40. The injection rubber pipe 41 is respectively connected and sealed with the conversion pipe body 51 and the nozzle 40 by adopting a sealing pipe thread, and the length of the injection rubber pipe 41 can be designed according to the drilling length; preferably, the sealed pipe thread is a 60 ° sealed pipe thread.

In an embodiment of the invention, the outer pipe body 10 comprises a butt joint outer pipe 20, an ascending limit coupling 21, a tool positioning coupling 22 and a rubber pipe outer pipe 23 which are sequentially distributed from top to bottom, and the guider 30 is connected to the lower end of the rubber pipe outer pipe 23; the first step 11 is arranged between the tool positioning coupling 22 and the rubber pipe outer pipe 23, and the second step 12 is arranged between the ascending limit coupling 21 and the tool positioning coupling 22. As shown in fig. 3, in the initial state, the switching pipe body 51 is installed between the ascending limit coupling 21 and the hose outer pipe 23, and by setting the valve inner wall sizes of the ascending limit coupling 21, the tool positioning coupling 22 and the hose outer pipe 23, and the outer diameter size of the switching pipe body 51, it is possible to realize that the switching pipe body 51 can pass over the first step 11 and can be blocked by the second step 12. By providing the second step 12, the inner string can be prevented from moving upwards; the first step 11 is provided to control the degree of freedom of downward movement of the inner string 2 by the sand slurry in the inner string 2.

Specifically, two ends of the butt joint outer pipe 20 are provided with oil pipe buckles, the upper end of the butt joint outer pipe 20 is used for being connected with an anchor, and the lower end of the butt joint outer pipe 20 is connected with an uplink limit coupling 21; the ascending limit coupling 21 and the tool positioning coupling 22 are connected with the rubber tube outer tube 23 by adopting an oil tube buckle, the butt joint outer tube 20 can be the same as the inner drift diameter of the rubber tube outer tube 23, and the inner drift diameter of the ascending limit coupling 21 is smaller than the inner drift diameter of the rubber tube outer tube 23; two ends of the tool positioning coupling 22 are provided with couplings; the two ends of the rubber tube outer tube 23 are oil tube buckles, and the length of the rubber tube outer tube 23 is related to the drilling length index. The butt joint outer pipe 20, the ascending limit coupling 21, the tool positioning coupling 22, the rubber pipe outer pipe 23 and the guider upper joint 32 can be connected through a tubing fastener. The anchor can be fixed by adopting a one-way slip, and the slip is anchored and released by lifting and lowering.

In one embodiment of the present invention, as shown in fig. 3, the switching tube 51 is provided with a tube passage 511 and a pin piston cavity 512, the upper end of the tube passage 511 is communicated with the first adapter 61, and the lower end of the tube passage 511 is communicated with the injection rubber tube 41; the pin piston cavity 512 is communicated with the pipe body channel 511, the positioning and limiting pin 52 is arranged in the pin piston cavity 512, and the sand slurry in the pin piston cavity 512 can generate an outward driving force for the positioning and limiting pin 52.

The pin piston cavity 512 is arranged along the radial direction of the switching tube body 51, and the positioning limit pin 52 is in sliding fit with the side wall of the pin piston cavity 512 and can move along the radial direction of the switching tube body 51 in the pin piston cavity 512. Further, the motion conversion mechanism 50 includes a pin fixing ring 54, the bottom of the positioning limit pin 52 is provided with a mounting hole for mounting a pin spring 53, and the pin spring 53 is arranged in the mounting hole along the radial direction of the conversion tube body 51; as shown in fig. 3 and 5, the positioning and restricting pin 52 is designed with a step to form a small diameter portion 521 and a large diameter portion 522, the side wall of the large diameter portion 522 is designed with an O-ring groove for matching with the side wall of the pin piston cavity 512, and an O-ring for sealing is arranged in the O-ring groove; the pin fixing ring 54 is in threaded connection with the opening of the pin piston cavity 512 and is sealed by an O ring, the small-diameter part 521 of the positioning and limiting pin 52 penetrates out of the pin fixing ring 54, the O ring is sealed between the pin piston cavity and the pin fixing ring, the large-diameter part 522 of the positioning and limiting pin 52 divides the pin piston cavity 512 into a first cavity and a second cavity which are separated from each other, the first cavity is located on the inner side of the large-diameter part 522, the second cavity is located on the outer side of the large-diameter part 522, the pipe body channel 511 is communicated with the second cavity, mortar flows into the second cavity, and the positioning and limiting pin 52 can be pushed to move inwards. Preferably, the positioning and limiting pin 52 is designed with a small hole communicating with the first cavity, which is used as a breathing hole. More preferably, the two end surfaces of the large diameter portion 522 are respectively designed with bosses for preventing hydraulic locking. As shown in fig. 5, the pipe body passage 511 is formed eccentrically for passing through the abrasive-laden slurry.

Further, a filter screen 55 is disposed between the pin piston cavity 512 and the tube passage 511. The sand slurry enters the second cavity of the pin piston cavity 512 through the filter screen 55, so as to achieve the purpose of driving the positioning limiting pin 52 to retract during operation.

In an embodiment of the present invention, as shown in fig. 2, the lower end of the inner tubular string lower oil inlet pipe 70 is connected with a lower oil inlet pipe joint 72, the upper end of the second butt joint pipe 62 is connected with a disconnecting joint 73, and the lower oil inlet pipe joint 72 can be plugged into the disconnecting joint 73; the shear pins 71 are disposed radially of the disconnect joint 73 and are connected to the lower tubing joint 72 and the disconnect joint 73.

Specifically, the inner tubular string lower oil inlet pipe 70 is in threaded connection with the lower oil inlet pipe joint 72 and is sealed by an O-ring; the lower joint 72 of the lower oil inlet pipe and the disconnecting joint 73 are connected by a disconnecting nail and sealed by an O ring; the disconnect 73 is threaded with the second pair of nipples 62 and sealed with O-rings.

In an embodiment of the present invention, as shown in fig. 2, the first docking pipe 61 is provided with a first insertion hole 611 and a second insertion hole 612 which are distributed from top to bottom, and an inner diameter of the first insertion hole 611 is smaller than an inner diameter of the second insertion hole 612; the second connection pipe 62 is provided with a plug 621, the plug 621 can contract inward to pass through the first insertion hole 611, and the plug 621 can be clamped in the second insertion hole 612. Specifically, the plug 621 may include a plurality of circumferentially distributed docking claws, the docking claws have elasticity, the plug 621 is inserted into the first plugging hole 611, the docking claws can be retracted inward to pass through the first plugging hole 611 and enter the second plugging hole 612, and the docking claws are prevented from moving toward the first plugging hole 611, and the plug 621 is snapped into the second plugging hole 612 to realize the docking of the first docking pipe 61 and the second docking pipe 62.

Further, the first adapter tube 61 is provided with a sealing hole 613 located above the first insertion hole 611, the second adapter tube 62 is provided with a sealing column 622 located above the insertion head 621, and the side wall of the sealing column 622 is provided with a sealing ring 623 capable of matching with the inner wall of the sealing hole 613. Specifically, the sidewall of the sealing post 622 is designed with a sealing groove for mounting the sealing ring 623. Preferably, the upper end of the sealing hole 613 is designed with a bell mouth to facilitate the butt joint of the second butt joint pipe 62.

In one embodiment of the present invention, a first centralizer 81 is connected between the first docking pipe 61 and the switching pipe body 51. By providing the first centralizer 81, the position of the first butt pipe 61 can be kept stable, the first butt pipe 61 is reduced from deflecting in the outer pipe column 1, and the second butt pipe 62 is conveniently butted against the first butt pipe 61. As shown in fig. 3, the switching tube body 51 is connected with the first centralizer 81 through a butt transition pipe 83; the butt transition pipe 83 is connected with the conversion pipe body 51 in a threaded manner and sealed at the end face.

Further, the first centralizer 81 includes a centralizing pipe 811, a centralizing spring 813 and a plurality of centralizing blocks 812, and two ends of the centralizing pipe 811 are respectively connected with the first butt-joint pipe 61 and the conversion pipe 51; the centralizing block 812 is connected to the centralizing pipe 811 and can move along the radial direction of the centralizing pipe 811, and a plurality of centralizing pipes 811 are circumferentially distributed around the centralizing pipe 811; the centralizing spring 813 is connected to the centralizing block 812 and can drive the centralizing block 812 to move outwards to abut against the outer tubular string 1 to reduce deflection of the inner tubular string. Specifically, the centering tube body 811 is in threaded connection with the butt transition tube 83 and sealed at the end face, and the first butt joint tube 61 is in threaded connection with the centering tube body 811 and sealed by O-rings.

As shown in fig. 3, a centering tube 811 has a groove for placing a centering block 812 in the circumferential direction, and a centering spring 813 is installed inside the inner tube centering block 812. Preferably, four sets of centering blocks 812 are evenly arranged around the circumference to provide centering action after expansion. The first centralizer 81 further includes a centralizing upper ring 814 and a centralizing lower ring 815, the centralizing upper ring 814 and the centralizing lower ring 815 are respectively in threaded connection with the centralizing pipe 811, and the centralizing upper ring 814 and the centralizing lower ring 815 radially limit the centralizing block 812.

Furthermore, as shown in fig. 6, a second centralizer 82 is disposed between the second butt joint pipe 62 and the inner string lowering oil pipe 70, and the second centralizer 82 has a function of centralizing the second butt joint pipe 62, so as to reduce deflection of the second butt joint pipe 62 during lowering, and facilitate butt joint of the second butt joint pipe 62 and the first butt joint pipe 61.

In an embodiment of the present invention, the outer string 1 includes a guide housing 31 connected to the lower end of the outer body 10, as shown in fig. 17 and 18, the guide housing 31 is provided with a through groove 311 radially penetrating therethrough, and the guide 30 is fixedly disposed in the through groove 311. With this structure, the assembly between the guide 30 and the guide housing 31 can be facilitated. In some cases, fixation between the guide 30 and the guide housing 31 may be achieved by a connection nail; preferably, the connection nail is perpendicular to the axial direction of the guide housing 31 and perpendicular to the penetrating direction of the through groove 311.

As shown in fig. 4, the outer tubing string 1 comprises a guide upper joint 32, a rubber tube guide ring 33, a guide limit ring 34 and a guide positioning and centralizing joint 35. The two ends of the guider shell 31 are provided with common threads and are respectively connected with the guider upper joint 32 and the guider positioning and centering joint 35, the guider upper joint 32 is connected with the guider shell 31 through the common threads, the guider positioning and centering joint 35 is connected with the guider shell 31 through the threads, and the rubber hose outer pipe 23 and the guider upper joint 32 are connected through a tubing fastener; the upper end of the guider positioning and centering joint 35 is designed with a solid step, the solid step is embedded into a positioning hole at the lower end of the guider 30, and the lower side of the guider positioning and centering joint 35 is designed with centering. The guide limiting ring 34 is sleeved outside the guide shell 31, the guide limiting ring 34 surrounds the guide 30, and the guide 30 can be radially limited; the hose guide ring 33 is inserted into the guide housing 31 and abuts against the guide 30, thereby positioning the guide 30 in the circumferential direction.

In one embodiment of the present invention, the guide 30 is a snap-in guide 302 and the nozzle 40 is a snap-in nozzle. The hydraulic jet drilling string can be applied to the condition with a casing pipe, and can also be applied to an open hole for directly drilling.

Example two

The invention provides a hydraulic jet drilling method, which adopts the hydraulic jet drilling pipe column, and as shown in fig. 19, the hydraulic jet drilling method comprises the following steps: step S10, mounting the nozzle 40, the jet rubber tube 41, the motion conversion mechanism 50, and the first adapter tube 61 in the outer string 1; step S20, lowering the outer pipe column 1 to a specified stratum; step S30, sequentially lowering the second butt joint pipe 62 and the inner tubular column lowering oil pipe 70, so that the second butt joint pipe 62 is spliced and communicated with the first butt joint pipe 61; step S40, introducing sand slurry into the inner pipe column, enabling the positioning limiting pin shaft 52 to contract inwards by the sand slurry entering the conversion pipe body 51, and meanwhile, ejecting the sand slurry outwards through the nozzle 40 to window the sleeve; and step S50, pushing the inner tubular column to move downwards, so that the nozzle 40 enters the stratum through the window to drill a hole, and continuously moves forwards to realize long-distance drilling of the stratum.

By using the hydraulic jet drilling string, the outer string 1 and the inner string 2 can be put into a specified stratum firstly, then casing windowing is carried out, and stratum drilling is carried out. In the running process of the pipe column, the first connecting pipe 61, the motion conversion mechanism 50, the nozzle 40 and the injection rubber pipe 41 in the inner pipe column 2 can be installed in the outer pipe column 1 and can be run into a specified stratum along with the outer pipe column 1; then, the inner pipe column in the inner pipe column 2 is lowered into the oil pipe 70 and the second butt joint pipe 62 into the outer pipe column 1, and is butted with the first butt joint pipe 61, so that the assembly of the inner pipe column 2 is completed; then sand slurry is pumped into the inner pipe column 2, casing windowing is carried out, and then stratum drilling is carried out.

In one embodiment of the present invention, the hydrajet drilling method comprises: step S60, lifting the inner pipe column to keep the inner pipe column in a stretching state; step S60 is provided between step S30 and step S40. By adopting the hydraulic jet drilling string, the outer diameter of the conversion pipe body 51 is larger than the inner diameter of the ascending limit coupling 21, so the ascending limit coupling 21 bears the ascending force without bearing the force of the jet rubber pipe 41, and the jet rubber pipe 41 and the nozzle 40 are effectively protected.

The hydrajetting drilling method may employ the hydrajetting drilling apparatus shown in fig. 1, and for the sake of understanding, the hydrajetting drilling method will be described in detail by way of example.

In step S10, before running downhole, as shown in fig. 7 and 8, the main components of the drill string include the entire outer string 1 and a portion of the inner string, wherein the inner string includes the first adapter 61, the first centralizer 81, the docking transition pipe 83, the motion conversion mechanism 50, the injection hose 41 and the nozzle 40, and the portion of the inner string is embedded in the outer string 1 during assembly.

In a non-pressure environment, the positioning limit pin 52 is in an extending state and is clamped at the first step 11 formed by the tool positioning coupling 22 and the rubber tube outer tube 23. The positioning limit pin 52 can resist 10-15t of pressure.

The centering block 812 is always in an expanded state due to the action of the centering spring 813, so that the centering function is achieved, and the first butt joint pipe 61 is ensured to be in a central position.

Step S20 includes: the upper end of the butt joint outer pipe 20 in the outer pipe column 1 is connected with an anchor, and the outer pipe column 1 is anchored after common oil pipes are put into a specified stratum. As shown in fig. 7 and 8, the hydrajet drilling string is in a run in condition.

Step S30 includes: and sequentially descending the second butt joint pipe 62, the disconnecting joint 73, the descending oil pipe lower joint 72 and the small-diameter oil pipe from the oil pipe, wherein the butt joint claw at the front end of the second butt joint pipe 62 passes through the first splicing hole 611 and enters the second splicing hole 612, and then the inner pipe column is lifted up without being disconnected, namely, the butt joint is realized. In the butt joint process, the positioning and limiting pin shaft 52 is always in an extending state, and impact force generated by butt joint of the inner pipe columns is completely acted on the positioning and limiting pin shaft. After the butt joint is completed, the inner pipe column is lifted up, and the inner pipe column is kept in a stretching state. As shown in fig. 9 and 10, the hydrajet drilling string is in an docked state.

Step S40 includes: after the butt joint is completed, radial drilling operation can be performed on the stratum. When the casing needs to be windowed, high-pressure sand slurry is injected into the inner pipe column, the sand slurry flows downwards through the inner pipe column, when the sand slurry passes through the motion conversion mechanism 50, a part of the sand slurry enters the pin shaft piston cavity 512 through the filter screen 55, and the positioning limiting pin shaft 52 is pushed to retract, so that the downward space of the inner pipe column is opened; the other part of the sand slurry passes through the pipe body channel 511 with the action conversion and then passes through the injection rubber pipe 41 and the nozzle 40 to realize the windowing action of the sleeve. As shown in fig. 11 and 12, the hydrajet drilling string is in a windowed state.

Step S50 includes: after the windowing is finished, the inner pipe column is opened in a descending state, the ground pushes the inner pipe column to descend, the nozzle 40 enters the stratum through the windowed window to drill, and effective holes for communicating the energy of the stratum are formed. As shown in fig. 13 and 14, the hydrajet drilling string is in a drilling state.

After the drilling is finished, the inner pipe column is lifted, the nozzle 40 and the injection rubber pipe 41 are retracted to a running-in state, and resetting is carried out; as shown in fig. 15 and 16, the motion conversion mechanism 50 moves up to the upper limit coupling 21 due to the pressure loss in the inner string 2; the positioning limit pin shaft 52 extends out, and the inner tubular column 2 is clamped at the upper limit coupling 21 due to the inner diameter difference. At this point, the lifting tonnage of the inner pipe string is continuously increased, the shear pin 71 is sheared, and the upper part of the inner pipe string is lifted out, so that the inner pipe string is separated, and then the upper part of the inner pipe string 2 can be lifted out. After the inner pipe column 2 is disconnected, the outer pipe column 1 can be lifted upwards. As shown in fig. 15 and 16, the hydrajet drilling string is in a disconnected and tripped condition.

After the working string is taken out, the continuous windowing and drilling actions can be carried out on different stratums according to the procedures of running-in, butt joint, windowing, drilling, releasing and taking-out.

The hydraulic jet drilling string and the method thereof can realize the hydraulic radial drilling operation of the abrasive on different stratums without ball throwing and displacement compensation and step-by-step implementation of two procedures of a windowing string and a drilling string, simplify the process flow, have simple operation, novel design, convenience and practicability and meet the requirements of field construction processes.

The dimensions shown are schematic, and the actual length of the pipe string is matched according to the length requirement of the drilled hole. The above description is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.

Claims

1. A hydrajetting drilling string, comprising: the outer pipe column and the inner pipe column are arranged in the outer pipe column;

the outer tubing string comprises:

the inner tubular string includes:

a nozzle;

2. The hydrajetting drilling string according to claim 1, wherein the switching tube body is provided with a tube body passage and a pin piston cavity, an upper end of the tube body passage is communicated with the first butt joint pipe, and a lower end of the tube body passage is communicated with the jetting rubber pipe; the pin shaft piston cavity is communicated with the pipe body channel, and the positioning and limiting pin shaft is arranged in the pin shaft piston cavity.

3. The hydrajetting drilling string of claim 2, wherein a filter screen is disposed between the pin piston cavity and the tube channel.

4. The hydrajetting drilling string as claimed in claim 1, wherein the first docking pipe is provided with a first plugging hole and a second plugging hole which are distributed from top to bottom, and the inner diameter of the first plugging hole is smaller than that of the second plugging hole;

the second butt joint pipe is provided with a plug connector, the plug connector can contract inwards to cross the first plug hole, and the plug connector can be clamped in the second plug hole.

5. The hydrajetting drilling string as claimed in claim 4, wherein the first pair of nipples has a sealing hole above the first insertion hole, the second pair of nipples has a sealing post above the insertion head, and the side wall of the sealing post has a sealing ring capable of engaging with the inner wall of the sealing hole.

6. The hydrajetting drilling string of claim 1, wherein a first centralizer is coupled between the first riser and the transition pipe body.

7. The hydrajetting drilling string of claim 6, wherein the first centralizer comprises a centralizing tubular body, a centralizing spring, and a plurality of centralizing blocks, wherein two ends of the centralizing tubular body are connected to the first nipple and the switching tubular body, respectively; the centralizing block is connected to the centralizing pipe body and can move along the radial direction of the centralizing pipe body, and a plurality of centralizing pipe bodies are distributed around the periphery of the centralizing pipe body; the centering spring is connected with the centering block and can drive the centering block to move outwards to be abutted against the outer tubular column.

8. The hydrajetting drilling string of claim 6, wherein a second centralizer is disposed between the second riser and the inner string lower tubing.

9. The hydrajetting drilling string according to claim 1, wherein a lower end of the inner string running oil pipe is connected with a running oil pipe lower joint, an upper end of the second butt joint pipe is connected with a disconnecting joint, and the running oil pipe lower joint can be plugged into the disconnecting joint; the shearing pin is arranged along the radial direction of the disconnecting joint and is connected with the lower joint of the lower oil pipe and the disconnecting joint.

10. The hydraulic jet drilling string as recited in claim 1, wherein the outer body comprises a butt joint outer tube, an ascending limit coupling, a tool positioning coupling and a rubber tube outer tube which are sequentially distributed from top to bottom, and the guider is connected to the lower end of the rubber tube outer tube; the first step is arranged between the tool positioning coupling and the rubber tube outer tube, and the second step is arranged between the ascending limiting coupling and the tool positioning coupling.

11. The hydrajetting drilling string of claim 1, wherein the outer string comprises a guide housing connected to a lower end of the outer body, the guide housing having a radially extending channel, the guide being secured within the channel.

12. A hydrajet drilling method, characterized in that the hydrajet drilling string according to any one of claims 1 to 11 is used, the hydrajet drilling method comprising:

step S20, lowering the outer pipe column to a specified stratum;

13. The hydrajet drilling method of claim 12, comprising: step S60, lifting the inner pipe column to keep the inner pipe column in a stretching state;

step S60 is provided between step S30 and step S40.