WO2017197608A1

WO2017197608A1 - Tailpipe hanger assembly

Info

Publication number: WO2017197608A1
Application number: PCT/CN2016/082533
Authority: WO
Inventors: 田炳周; 易会安; 陈善饮; 李伯仁; 陈光礼; 易齐尊
Original assignee: 思达斯易能源技术(集团)有限公司
Priority date: 2016-05-18
Filing date: 2016-05-18
Publication date: 2017-11-23

Abstract

Provided is a tailpipe hanger assembly, comprising a hydraulic tailpipe hanger and a service delivery tool mounted therein. The hydraulic tailpipe hanger comprises a sand prevention cap, a tie-back barrel, a left-hand threaded joint, a cone, slips, a body, a push rod, a piston and a hydraulic cylinder which are coaxially arranged, the sand prevention cap and the left-hand threaded joint being mounted at the upper and lower ends of the tie-back barrel respectively, the slips being arranged on the cone, the body being arranged in the cone and connected to the left-hand threaded joint, the push rod being fixed on the body of the hydraulic cylinder, and the piston being mounted inside the hydraulic cylinder. The service delivery tool comprises a releasing device, a shield mechanism, a lifting sub, a central tube and a ball seat module which are coaxially arranged, the top end of the central tube being connected to the lifting sub, both the releasing device and the shield mechanism being mounted on the central tube, the ball seat module being connected to the lower end of the central tube and comprising a ball seat body and a hollow rubber plug mounted at a lower portion of the ball seat body, and the inner diameter of a cavity in the ball seat body being equal to that of the central tube.

Description

Tail pipe hanger assembly

Technical field

The invention relates to a cementing tool in the field of petroleum, in particular to a hydraulic tail pipe hanger assembly.

Background technique

In the tailing pipe suspension cementing operation of oil and gas wells, directional wells, horizontal wells, etc., in order to save a large amount of casing and cement, the cementing operation mostly adopts the tail pipe cementing method. When the tail pipe is suspended and cemented, the tail pipe is suspended. The downhole of the well must meet the requirements of “hanging, smashing, opening, and getting out”. At present, the tail pipe hanger used at home and abroad often encounters the following problems during the operation, resulting in unsuccessful operation:

(1) When the hanger is lost, the sand is fed into the cylinder, and the hanger service tool is stuck, resulting in failure to work properly;

(2) After the tail pipe hanger is lowered into the setting position, it is difficult to lose the hand;

(3) During the process of inserting the hanger, it is easy to damage the slip and affect the suspension due to bumping or improper operation;

(4) When the large displacement cycle occurs, it may lead to setting up in advance and affecting the production operation;

(5) The ball seat is located at the bottom of the tail pipe string, and the waiting time for the pitching ball is long; for the horizontal well, the ball cannot advance on its own in the horizontal section, and the ball feeder is needed.

Invention disclosure

The technical problem to be solved by the present invention is to provide a tail pipe hanger assembly to overcome the above-mentioned drawbacks which are prone to occur when the tail pipe hanger of the prior art is operated in different well conditions.

In order to achieve the above object, the present invention provides a tail pipe hanger assembly for use in cementing operations in oil drilling engineering, including:

Hydraulic tail pipe hanger, which is a hollow pipe column structure, including a coaxial sand shield, a return cylinder, a reverse joint, a cone, a slip, a body, a push rod, a piston and a hydraulic cylinder, and the sand cap is installed At an upper end of the return sleeve, an upper end of the buckle joint is connected to a lower end of the return sleeve, the slip is disposed in a slip groove on the cone, and the body is disposed at the The upper end of the body is connected to the lower end of the buckle joint, and the push rod is located below the cone and fixed to the hydraulic cylinder a cylinder mounted in the hydraulic cylinder; and

a service tool is installed in the hydraulic tail pipe hanger and disposed coaxially with the hydraulic tail pipe hanger, including a coaxially disposed hand throwing device, a shielding mechanism, a lifting short, a center pipe and a ball a seat module, a top end of the center tube is connected to the lifting short connection, and the handle device and the shielding mechanism are both mounted on the center tube, and the shielding mechanism corresponds to a liquid inlet hole of the hydraulic cylinder Provided that the ball seat module is coupled to a lower end of the center tube and located at a bottom of the tubular tail of the hydraulic tail pipe hanger, the ball seat module including a ball seat body and an air core rubber installed at a lower portion of the ball seat body a plug, the cavity of the ball seat body is provided with an elastic claw, the inner diameter of the cavity of the ball seat body is the same as the inner diameter of the center tube, so as to directly push the ball in the column of the center tube After the elastic claws are described, the drill plugs pass smoothly.

The tail pipe hanger assembly, wherein the hand loss device comprises an expansion stopper, an inverted bearing, a reverse spring and a rectangular buckle which are coaxially arranged from top to bottom, and two of the reverse springs The ends are respectively abutted between the inverted bearing and the rectangular buckle, and the inverted bearing abuts the expansion stopper.

In the above-mentioned tail pipe hanger assembly, wherein the surface of the rectangular toothed buckle is uniformly folded with 14 rectangular teeth, and when the hand is lost, the reverse bearing and the reverse spring are pressed, and the forward rotation is performed to make the sending The service tool is disengaged from the hydraulic tail pipe hanger.

In the above described tail pipe hanger assembly, wherein the expansion seal block is provided with a plurality of expansion springs, the axis of the expansion spring being perpendicular to the axis of the center tube.

The tail pipe hanger assembly, wherein the shielding mechanism comprises a shielding sleeve, a connecting sleeve and a reverse buckle joint, and the side wall of the central tube is provided with a sidewall through hole for liquid to pass through, the connecting sleeve set Fixing on the center tube and through the back button joint, the connecting sleeve is provided with a connecting sleeve through hole corresponding to the side wall through hole, and the shielding sleeve is sleeved on the connecting sleeve and passes through a shear pin The shielding sleeve has a shielding position and an opening position with respect to the liquid inlet holes of the hydraulic cylinder.

The tail pipe hanger assembly described above, wherein the thread on the buckle joint is a 45 degree sawtooth thread.

In the above-mentioned tail pipe hanger assembly, a plurality of star sand control holes are uniformly arranged on the cylinder of the sand control cap, and a sand control filter is screwed into the star sand control hole.

The above-mentioned tail pipe hanger assembly, wherein a plurality of strip-shaped grooves for mounting the slips are uniformly distributed on an outer circumference of the cone, and the ends of the slips are tapered structures, and the slips are Each of the cones has an open position and a buried position with respect to the cone, and the outer surface of the slip is radially lower than the outer circumferential surface of the cone when the buried position is located.

The tail pipe hanger assembly described above, wherein the feeding service tool further comprises an anti-lock device, the anti-lock device being fitted on the center pipe and connected to the shielding mechanism.

The tail pipe hanger assembly described above, wherein the anti-lock device includes a bump and a support sleeve, the bump being mounted in the support sleeve, the support sleeve being coupled to the shielding mechanism.

The invention is described in detail below with reference to the accompanying drawings and specific embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic structural view of a tail pipe hanger assembly according to an embodiment of the present invention;

2 is a schematic structural view of a hydraulic tail pipe hanger according to an embodiment of the present invention;

3 is a schematic structural diagram of a feeding service tool according to an embodiment of the present invention;

4 is a schematic structural view of a ball seat module according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a shielding mechanism according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a hand lost device according to an embodiment of the present invention.

Where the reference number

1 Hydraulic tail pipe hanger

11 sand control cap

111 star sand control hole

12 reticle

13 buckle joint

14 cone

15 kava

16 ontology

17 putter

18 hydraulic cylinder

19 righting block

2 feeding service tools

21 hand throwing device

211 expansion stop block

212 reverse bearing

213 reverse spring

214 rectangular tooth buckle

215 expansion spring

22 shielding mechanism

221 shielding sleeve

222 connection sleeve

223 buckle joint

23 Lift Short

24 center tube

241 sidewall through hole

25 ball seat module

251 ball seat

252 hollow core rubber stopper

253 elastic claw

26 anti-lock device

261 bump

262 support sleeve

The best way to implement the invention

The structural principle and working principle of the present invention will be specifically described below with reference to the accompanying drawings:

1 to FIG. 3, FIG. 1 is a schematic structural view of a tail pipe hanger assembly according to an embodiment of the present invention, and FIG. 2 is a schematic structural view of a hydraulic tail pipe hanger 1 according to an embodiment of the present invention; A schematic diagram of the structure of the feed service tool 2 of an embodiment. The tail pipe hanger assembly of the present invention is used for cementing operations in oil drilling engineering, including a hydraulic tail pipe hanger 1 and a feeding service tool 2, wherein the hydraulic tail pipe hanger 1 is a hollow pipe column The structure, including the coaxially disposed sand control cap 11, the return cylinder 12, the buckle joint 13, the cone 14, the slip 15, the body 16, the push rod 17, the piston (not shown), and the hydraulic cylinder 18, may also include a plurality of right-fitting blocks 19, the sand-proof caps 11 are screw-fitted to the upper end of the return-fitting tube 12, and a plurality of star-shaped sand-proof holes 111 are uniformly arranged on the cylinder of the sand-proof cap 11 A sand control filter is screwed into the sand control hole 111 to prevent the solid phase particles from entering the return cylinder 12, thereby preventing the sand card from being affected, and the subsequent construction work is not affected. The upper end of the buckle joint 13 and the return cylinder 12 are Connected to the lower end, The slips 15 are disposed in the slots 15 of the cones 14, and a plurality of strip-shaped grooves for mounting the slips 15 are uniformly distributed on the outer circumference of the cones 14, the slips 15 has a tapered structure at both ends, and the slips 15 respectively have an open position and a buried position with respect to the cone 14, and the outer surface of the slip 15 is lower in the radial direction when the buried position is located The outer circumferential surface of the cone 14, preferably six slips 15, is uniformly immersed in the annular groove of the cone 14, does not scratch the slip 15 when passing through the wellhead, and the double tapered slip 15 is suspended. The tonnage is larger than the ordinary slips 15 , the body 16 is disposed in the cone 14 and the upper end of the body 16 is coupled to the lower end of the buckle joint 13 , and the push rod 17 is located at the cone 14 The cylinder is fixed to the cylinder of the hydraulic cylinder 18 by a screw connection, and the piston is mounted in the hydraulic cylinder 18.

The service tool 2 is installed in the hydraulic tail pipe hanger 1 and disposed coaxially with the hydraulic tail pipe hanger 1, including a coaxially disposed hand throwing device 21, a shielding mechanism 22, and a lifting short 23, a central tube 24 and a ball seat module 25, the top end of the central tube 24 is connected to the lifting short 23, the hand-discharging device 21 is disposed on the outer circumference of the lifting short 23, and the shielding mechanism 22 is mounted at the On the outer circumference of the central tube 24, the shielding mechanism 22 is disposed corresponding to the liquid inlet hole of the hydraulic cylinder 18, and the ball seat module 25 is connected to the lower end of the center tube 24 and located at the hydraulic tail pipe hanger 1 at the bottom of the column.

Referring to FIG. 4, FIG. 4 is a schematic structural diagram of a ball seat module according to an embodiment of the present invention. In the embodiment, the ball seat module 25 includes a ball seat body 251 and a hollow core rubber plug installed on a lower portion of the ball seat body 251. 252. The cavity of the ball seat body 251 is provided with a resilient claw 253. The inner diameter of the cavity of the ball seat body 251 is the same as the inner diameter of the central tube 24, so as to directly pitch the ball in the column of the central tube 24. After the elastic claw 253 is pressed off, the drill plug is smoothly passed, which effectively ensures that other service tools can smoothly enter the well from the central tube 24, and the hollow rubber plug 252 can scrape the inner body of the hanger. Ensure that the impact is accurate. The feed service tool 2 can also include an anti-lock device 26 that fits over the center tube 24 and is coupled to the shield mechanism 22. The anti-lock device 26 includes a bump 261 and a support sleeve 262. The bump 261 is mounted in the support sleeve 262, and the support sleeve 262 is coupled to the shielding mechanism 22.

Referring to FIG. 5, FIG. 5 is a schematic structural view of a shielding mechanism according to an embodiment of the present invention. In this embodiment, the shielding mechanism 22 includes a shielding sleeve 221, a connecting sleeve 222 and a reverse fastening joint 223. The side wall of the central tube 24 is provided with a sidewall through hole 241 for liquid passage, and the connecting sleeve 222 The sleeve 222 is fixed on the central tube 24 and is fixed by the reverse joint 223. The connecting sleeve 222 is provided with a connecting sleeve 222 through hole corresponding to the sidewall through hole 241, and the shielding sleeve 221 is set in the connection. The sleeve 222 is fixed by a shear pin, and the shield sleeve 221 has a liquid inlet hole with respect to the hydraulic cylinder 18, respectively. A shielding position and an opening position. Wherein, the thread on the buckle joint 223 is preferably a 45-degree sawtooth thread, like a cone clutch, the tail pipe does not fall under the weight of the tail pipe during the well entering process, and if the tail pipe enters the well, the large row is blocked. The amount of circulating mud or the large-scale moving tail pipe release card will not cause the slip 15 to extend, preventing the slip 15 from hanging in advance.

Referring to FIG. 6, FIG. 6 is a schematic structural diagram of a hand lost device according to an embodiment of the present invention. The throwing device 21 includes an expansion stop 211, an inverted bearing 212, a reverse spring 213 and a rectangular tooth 214 which are coaxially arranged from top to bottom. The two ends of the reverse spring 213 are respectively abutted Between the inverted bearing 212 and the rectangular buckle 214, the inverted bearing 212 abuts the expansion stop 211. Wherein, the surface of the rectangular toothed buckle 214 is evenly folded by 14 rectangular teeth, and when the hand is lost, the reverse bearing 212 and the reverse spring 213 are pressed down, and the feeding service tool 2 is placed. The hydraulic tail pipe hanger 1 is disengaged. The expansion seal block 211 is provided with a plurality of expansion springs 215 whose axes are perpendicular to the axis of the central tube 24. Under the action of the inverted bearing 212 and the reverse spring 213 when the hand is lost, the feeding service tool 2 unit can be separated from the hanger main unit by pressing down, and there is no need to find a neutral point, and the pressure can be reversed. The service tool 2 is detached from the hanger.

After the pressure is applied, the piston in the hydraulic cylinder 18 pushes the push rod 17 to press the cone 14, and the slip 15 in the groove of the slip 15 of the cone 14 projects outwardly on the outer circumference under the action of the cone 14. Sit and hang on the wall of the casing to complete the hanging of the tool. During the whole process, the righting block 19 keeps the tool in a vertical state to prevent the main unit of the hydraulic tail pipe hanger 1 from being bent. The feeding service tool 2 is placed in the hydraulic tail pipe hanger 1, and is pushed down to the design depth, the ball is thrown, the ball is pressed after reaching the ball seat, the shielding sleeve 221 is opened, the pressure pushes the piston to cut the hydraulic cylinder 18 pin, and then pushes The push rod 17, the push rod 17 drives the slip 15 up, and the slip 15 rises and hangs along the cone surface of the cone 14. After the suspension and inspection are completed, continue to suppress the shearing ball seat, and turn the buckle to release the hand. After the successful hand release, the pipe string is lowered and the cementing and cementing operation is carried out. After the cementing operation is completed, the service tool is submitted and completed. The entire process.

In the invention, since the sand control cap is provided, the solid tail pipe hanger does not enter the feeding service tool during the process of entering, preventing the back pipe from being sanded; the slip is a double-cone long-buried structure. When passing through the wellhead, it will not be scratched by burrs, mud and sand in the well, and avoid the damage of the hydraulic tail pipe hanger during the process of entering the hole; during the process of inserting, the shielding sleeve can make the hanger tail pipe encounter the resistance card, Large-displacement circulating mud or large-scale moving tail pipe to unlock the card, will not lead to hanging in advance; due to the protection of the shielding mechanism, the slip will not stick out, and prevent the phenomenon of sitting in advance; During the pitching operation, since the tee is not placed at the lower end of the tail pipe of the hydraulic tail pipe hanger, it is fed with the service tool. Placed in the hydraulic tail pipe hanger together, reducing the waiting time for pitching, and even if working in a horizontal well, there is no need for a ball thrower. The hollow rubber plug at the tail of the ball seat cleans the inner wall of the tail pipe hanger to ensure that the wall is cleaned and scraped. The impact is accurate.

The invention may, of course, be embodied in a variety of other embodiments without departing from the spirit and scope of the invention. Changes and modifications are intended to be included within the scope of the appended claims.

Industrial applicability

The invention has the following characteristics:

(1) The slip of the hydraulic tail pipe hanger is double-tapered and buried, and the slip is not scratched when passing through the wellhead, and the weight of the suspension is larger than that of the ordinary slip;

(2) The hydraulic tail pipe hanger has a shielding mechanism. Because of its unique shielding structure, when the tail pipe enters the well, it can be discharged with large displacement circulating mud or large and vertical moving tail pipe, which will not make the card. The tile is extended to avoid the phenomenon of sitting in advance;

(3) The hydraulic tail pipe hanger has a sand control cap with sand control and sand filter function, which avoids the problem that the hanger is lost in the back pipe and the sanding card is sent into the service tool.

(4) The ball seat of the hydraulic tail pipe hanger is not placed at the bottom of the tail pipe string, but the ball seat is placed in the tail pipe hanger, which reduces the waiting time for the pitching ball, and does not require the use of the ball feeder for the pitching operation, and The defect that the ball must be used in the horizontal well, the large inclined well and the large displacement well to put the ball into position is avoided, so that the tail pipe hanger has better adaptability to the horizontal well and the inclined well.

Claims

A tail pipe hanger assembly for cementing operations in an oil drilling project, comprising:

Hydraulic tail pipe hanger, which is a hollow pipe column structure, including a coaxial sand shield, a return cylinder, a reverse joint, a cone, a slip, a body, a push rod, a piston and a hydraulic cylinder, and the sand cap is installed At an upper end of the return sleeve, an upper end of the buckle joint is connected to a lower end of the return sleeve, the slip is disposed in a slip groove on the cone, and the body is disposed at the The upper end of the body is connected to the lower end of the reverse joint, the push rod is located below the cone and is fixed on the cylinder of the hydraulic cylinder, and the piston is mounted on the hydraulic cylinder Inside;

a service tool is installed in the hydraulic tail pipe hanger and disposed coaxially with the hydraulic tail pipe hanger, including a coaxially disposed hand throwing device, a shielding mechanism, a lifting short, a center pipe and a ball a seat module, a top end of the center tube is connected to the lifting short connection, the hand losing device is disposed on an outer circumference of the lifting shorting, the shielding mechanism is mounted on the center tube, and the shielding mechanism Corresponding to a liquid inlet arrangement of the hydraulic cylinder, the ball seat module is coupled to a lower end of the center tube and located at a bottom of the column of the hydraulic tail pipe hanger, the ball seat module including a ball seat body and mounted on a hollow core rubber plug in a lower portion of the ball seat body, wherein a cavity of the ball seat body is provided with an elastic claw, and an inner diameter of the cavity of the ball seat body is the same as an inner diameter of the center tube so as to directly face the center tube After the ball is pressed and pressed to release the elastic claw, the drill plug passes smoothly.
A tail pipe hanger assembly according to claim 1, wherein said handcuff device comprises an expansion stop, an inverted bearing, a reverse spring and a rectangular buckle which are coaxially arranged from top to bottom. Two ends of the reverse spring respectively abut between the inverted bearing and the rectangular buckle, and the inverted bearing abuts the expansion stopper.
The tail pipe hanger assembly according to claim 2, wherein the surface of the rectangular toothed ring is uniformly folded by 14 rectangular teeth, and the reverse bearing and the reverse spring are passed through when the hand is lost. The positive pressure rotation causes the feed service tool to be disengaged from the hydraulic tail pipe hanger 1.
A tail pipe hanger assembly according to claim 2, wherein said expansion seal is provided with a plurality of expansion springs, the axis of said expansion spring being perpendicular to the axis of said central tube.
The tail pipe hanger assembly according to claim 1, 2, 3 or 4, wherein the shielding mechanism comprises a shielding sleeve, a connecting sleeve and a reverse buckle joint, and the side wall of the central tube is provided with Liquid a through-wall through hole, the connecting sleeve is sleeved on the central tube and fixed by the reverse buckle joint, and the connecting sleeve is provided with a connecting sleeve through hole corresponding to the sidewall through hole, the shielding The sleeve is sleeved on the connecting sleeve and fixed by a shear pin, and the shielding sleeve has a shielding position and an opening position respectively with respect to the liquid inlet hole of the hydraulic cylinder.
The tail pipe hanger assembly of claim 5 wherein the threads on the buckle joint are 45 degree serrated threads.
The tail pipe hanger assembly according to claim 1, 2, 3 or 4, wherein the cylinder of the sand control cap is uniformly provided with a plurality of star sandproof holes, and the star sand control holes are threaded. Screw-proof filter is screwed.
A tail pipe hanger assembly according to claim 1, 2, 3 or 4, wherein a plurality of strip-shaped grooves for mounting the slips are uniformly distributed on an outer circumference of the cone, The ends of the slip are tapered, and the slip has an open position and a buried position with respect to the cone, and the outer surface of the slip is lower than the radial direction when the buried position is The outer circumferential surface of the cone.
A tail pipe hanger assembly according to claim 1, 2, 3 or 4, wherein said feed service tool further comprises an anti-lock device, said anti-lock device being fitted to said center tube And connected to the shielding mechanism.
A tail pipe hanger assembly according to claim 9, wherein said anti-locking device comprises a projection and a support sleeve, said projection being mounted in said support sleeve, said support sleeve and said support sleeve The shielding mechanism is connected.