CN111946271A - Non-rotary joint for continuous pipe - Google Patents
Non-rotary joint for continuous pipe Download PDFInfo
- Publication number
- CN111946271A CN111946271A CN201910398258.4A CN201910398258A CN111946271A CN 111946271 A CN111946271 A CN 111946271A CN 201910398258 A CN201910398258 A CN 201910398258A CN 111946271 A CN111946271 A CN 111946271A
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- CN
- China
- Prior art keywords
- joint
- guide
- coiled tubing
- connector
- lower joint
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
Abstract
The invention provides a non-rotary joint for a coiled tubing, which comprises a lower joint, an upper joint and a lower joint, wherein the upper end of the lower joint is hermetically penetrated with the upper joint, and the upper joint is provided with a guide head capable of stretching into the lower joint in a centering manner; the compressing sleeve is sleeved on the lower connector and provided with a limiting step capable of abutting against the upper connector, and the compressing sleeve can compress the upper connector on the lower connector through the limiting step. The upper connector is directly pressed on the lower connector through the pressing sleeve, the risk that the tool string in the well is accidentally turned over due to the fact that the tool string placed in the well is turned over is avoided, and when the coiled tubing is connected through the non-rotary connector, auxiliary screwing-up equipment such as hydraulic tongs is not needed, the connection process is simplified, the connection time is shortened, the working time of workers below the injection head is reduced, and the operation safety is improved.
Description
Technical Field
The invention relates to well drilling, in particular to a non-rotary joint for a coiled tubing.
Background
At present, the coiled tubing drilling completion technology is widely applied to sidetrack drilling abroad, research on the coiled tubing drilling completion technology and tools is continuously developed in recent years at home, in the traditional drilling operation, a drill rod is connected with a lower well through threads, in the connection process, a lower string seat well is locked by slips, an elevator lifts an upper drilling tool needing to be connected, and hydraulic tongs are used for rotating the upper drilling tool to complete the upper buckling connection.
In the coiled tubing operation, a connector is fixed at the tail end of the coiled tubing, the upper end of the connector is connected with the coiled tubing through rivets, the lower end of the connector is provided with a threaded buckle, and the coiled tubing cannot rotate due to the fact that the coiled tubing cannot rotate, and the connector and the coiled tubing cannot rotate due to the fact that the coiled tubing is connected through the rivets. In the traditional connection method, a rivet for connecting the connector and the continuous pipe is firstly detached, so that the connector can rotate freely, the connector is connected with a lower tool string by using hydraulic pliers, after the connection is finished, the connector and the whole tool string connected in a well are rotated, so that a rivet hole of the connector is aligned with a counter bore preset in the continuous pipe, and the rivet is screwed in to finish the connection;
however, the conventional continuous pipe connection method has several disadvantages:
1. the number of rivets for connecting the continuous pipe and the connector is large, and the disassembly and assembly time is long;
2. when the continuous pipe connector is connected with the lower tool string, the centering is difficult;
3. the lower tool string needs to be reversed in the connection process, the tool string is very heavy in self weight and difficult to rotate because the whole tool string is placed in the well, and the tool string is reversed, so that the risk of accidental reversing of the tool string in the well exists;
4. the volume of the hydraulic clamp is large, and meanwhile, the coiled tubing injection head occupies a large space of a well head, so that the operation of the hydraulic clamp is inconvenient;
5. workers need to work below the coiled tubing injection head for a long time, and potential safety hazards are large.
Disclosure of Invention
The invention aims to provide a non-rotary joint for a coiled tubing, which solves the problem that the coiled tubing is inconvenient to disassemble and assemble with a lower tool.
The above object of the present invention can be achieved by the following technical solutions:
the invention provides a non-rotary joint for a coiled tubing, comprising,
the upper end of the lower joint is hermetically penetrated with an upper joint, and the upper joint is provided with a guide head which can be inserted into the lower joint in a centering way;
the compressing sleeve is sleeved on the lower connector and provided with a limiting step capable of being abutted to the upper connector, and the compressing sleeve can compress the upper connector on the lower connector through the limiting step.
Furthermore, a plurality of upper guide keys are arranged at intervals along the circumferential direction of the guide head;
the inner wall of the lower joint is provided with a plurality of lower guide keys at intervals along the circumferential direction, guide grooves are formed between every two adjacent lower guide keys, and each upper guide key can be inserted into the corresponding guide groove.
Furthermore, a V-shaped guide shoe chamfer part is formed at the lower end of the upper guide key, a V-shaped positioning chamfer part is formed at the upper end of the guide groove, and the V-shaped guide shoe chamfer part can be inserted into the V-shaped positioning chamfer part.
Furthermore, be equipped with spacing bulge loop on the outer wall of top connection the direction head stretches into under the state in the lower clutch, spacing bulge loop butt is in the upper end of lower clutch, just spacing step butt is in the upper end of spacing bulge loop, it connects to compress tightly the cover on the lower clutch.
Further, the pressing sleeve is connected to the lower connector through threads.
Furthermore, a conical guide shoe is formed at the lower end of the guide head, a conical positioning step is formed on the inner wall of the lower connector, and the conical guide shoe can abut against the conical positioning step.
Further, at least one first sealing ring is arranged between the conical positioning step and the conical guide shoe in a sealing mode.
Furthermore, at least one second sealing ring is arranged between the lower connector and the guide head in a sealing mode.
Further, the lower end of the lower joint is provided with an external thread part.
Further, an internal thread part is arranged at the upper end of the upper joint.
The non-rotary joint for the continuous pipe has the characteristics and advantages that:
the upper joint is directly pressed on the lower joint through the pressing sleeve, the risk that the tool string in the well is accidentally turned over due to the fact that the tool string in the well is turned over is avoided, and when the coiled tubing is connected through the non-rotary joint, auxiliary screwing equipment such as hydraulic tongs does not need to be used, the connection steps are simplified, the connection time is shortened, the working time of workers below the injection head is shortened, and the operation safety is improved.
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 view of a non-rotating joint for a coiled tubing according to the present invention;
FIG. 2 is a schematic view showing the structure of a lower joint in a non-rotating joint for a coiled tubing according to the present invention;
FIG. 3 is a schematic view of the structure of the upper joint of the non-rotatable joint for coiled tubing according to the present invention;
fig. 4 is a schematic view showing the structure of a compression sleeve in a non-rotating joint for a coiled tubing according to the present invention.
The reference numbers illustrate:
1. a lower joint; 11. a lower guide key; 111. a guide groove; 1111. a V-shaped positioning chamfered part; 12. a conical positioning step; 121. an O-shaped sealing groove; 13. an external threaded portion; 14. an external threaded portion; 2. an upper joint; 21. a guide head; 211. an upper guide key; 2111. a V-shaped guide shoe chamfer; 212. a tapered guide shoe; 22. a limit convex ring; 23. an internal thread portion; 24. an O-shaped sealing groove; 3. a compression sleeve; 31. a limiting step; 32. an internal thread portion; 4. a first seal ring; 5. and a second seal ring.
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.
As shown in fig. 1 to 4, the present invention provides a non-rotating joint for a coiled tubing, comprising a lower joint 1, an upper joint 2 hermetically penetrated at the upper end thereof, the upper joint 2 having a guide head 21 capable of centering into the lower joint 1; compressing tightly cover 3, it cup joints on lower clutch 1, is equipped with the spacing step 31 that can the butt on the top connection 2 on compressing tightly cover 3, compresses tightly cover 3 and can compress tightly top connection 2 on lower clutch 1 through spacing step 31.
The upper connector 2 is directly pressed on the lower connector 1 through the pressing sleeve 3, the risk of accidental back-off of a tool string in a well due to the fact that the tool string placed in the well is reversed is avoided, and when the coiled tubing is connected through the non-rotary connector, auxiliary top-off equipment such as hydraulic tongs is not needed, the connection process is simplified, the connection time is shortened, the working time of workers below an injection head is reduced, and the operation safety is improved.
Specifically, as shown in fig. 2, in the present invention, the lower end of the lower joint 1 is provided with a male screw portion 13, and the lower tool string is connected to the lower joint 1 through the male screw portion 13. The upper end of the lower joint 1 is provided with an external thread part 14, the inner wall of the upper end of the lower joint 1 is provided with a plurality of lower guide keys 11 at intervals along the circumferential direction, a guide groove 111 is formed between every two adjacent lower guide keys 11, in the embodiment, the upper end of the guide groove 111 is provided with a V-shaped positioning chamfer part 1111, and the V-shaped positioning chamfer part 1111 is in a generally triangular shape; in this embodiment, a tapered positioning step 12 is further formed on the inner wall of the lower joint 1, the tapered positioning step 12 is located below the plurality of lower guide keys 11, and the surface of the tapered positioning step 12 is tapered radially inward in the direction toward the lower end of the lower joint 1.
As shown in fig. 3, in the present invention, the upper end of the upper joint 2 is provided with a female screw 23, and the continuous pipe connector is connected to the upper joint 2 by the female screw 23. The guide head 21 is arranged at the lower end of the upper connector 2, a plurality of upper guide keys 211 are arranged on the guide head 21 at intervals along the circumferential direction of the guide head, after the guide head 21 of the upper connector 2 is inserted into the upper end of the lower connector 1, each upper guide key 211 can be inserted into the corresponding guide groove 111, and the guide head 21 cannot rotate in the lower connector 1 through the mutual matching between the plurality of lower guide keys 11 and the plurality of lower guide keys 11. In the present embodiment, the lower end of the upper guide key 211 is formed with a V-shaped guide chamfer portion 2111, the V-shaped guide chamfer portion 2111 has a substantially inverted triangular shape, the V-shaped guide chamfer portion 2111 can be inserted into the V-shaped positioning chamfer portion 1111, and the V-shaped guide chamfer portion 2111 and the V-shaped positioning chamfer portion 1111 are engaged with each other, so that the guide head 21 can be easily inserted into the lower joint 1 without aligning the key when the guide head 21 is inserted into the lower joint 1.
In this embodiment, a limit protruding ring 22 is provided on the outer wall of the upper joint 2, and in a state where the guide head 21 is inserted into the lower joint 1, the limit protruding ring 22 abuts against the upper end of the lower joint 1, and the limit protruding ring 22 can limit the depth of insertion of the upper joint 2 into the lower joint 1.
In the present embodiment, a tapered guide 212 is formed at the lower end of the guide head 21, and the tapered guide 212 can abut against the tapered positioning step 12 after the guide head 21 is inserted into the lower joint 1. The tapered guide 212 has the effect of guiding the upper connector 2 and the lower connector 1 to be centered when the guide head 21 is inserted into the lower connector 1.
As shown in fig. 4, in the present invention, the pressing sleeve 3 has a substantially cylindrical shape, and an internal thread portion 32 is provided on an inner wall of a lower end thereof, and a stopper step 31 is formed radially inward of an upper end thereof, and an inner diameter of the stopper step 31 is smaller than an inner diameter of the internal thread portion 32 of the lower end of the pressing sleeve 3. The compressing sleeve 3 can be sleeved on the external thread part 14 of the lower joint 1 through the internal thread part 32, and the limit step 31 of the compressing sleeve 3 can be pressed against the limit convex ring 22 of the upper joint 2 until the compressing sleeve 3 is screwed with the lower joint 1, at this time, the upper joint 2 is connected on the lower joint 1 by the compressing sleeve 3 in a pressing mode. Of course, in other embodiments, the pressing sleeve 3 and the lower joint 1 may also be connected by a press-and-buckle connection, which is not limited herein.
In a possible embodiment of the present invention, as shown in fig. 1 and fig. 2, at least one first sealing ring 4 is disposed between the tapered positioning step 12 and the tapered guide shoe 212 in a sealing manner, in this embodiment, the number of the first sealing rings 4 is two, but in other embodiments, the number of the first sealing rings 4 may also be three or four, which is not limited herein, in this embodiment, the first sealing ring 4 is an O-shaped sealing ring, and two O-shaped sealing grooves 121 are disposed on the tapered positioning step 12, and the two O-shaped sealing rings are disposed in the two O-shaped sealing grooves 121, respectively.
In another possible embodiment of the invention, as shown in fig. 1 and 3, at least one second sealing ring 5 is sealingly arranged between the lower joint 1 and the guide head 21. In this embodiment, the number of the second seal rings 5 is two, and the two second seal rings 5 are both located above the two first seal rings 4, but certainly, in other embodiments, the number of the second seal rings 5 may also be three or four, which is not limited herein, in this embodiment, the second seal rings 5 also adopt O-shaped seal rings, and two O-shaped seal grooves 24 are formed on the guide head 21, and the two second seal rings 5 are respectively disposed in the two O-shaped seal grooves 24.
As shown in fig. 1 to 4, the actual construction process of the non-rotary joint for a continuous pipe according to the present invention is as follows:
the lower end of the lower joint 1 is connected with a lower tool string through an external thread part 13, the lower joint is placed in a well mouth after the connection is finished, a pressing sleeve 3 is sleeved in the outer circle of the upper part of an upper joint 2, at the moment, an internal thread part 23 at the upper end of the upper joint 2 is connected with a continuous pipe connector through a thread, an injection head is lifted by a hook or a crane, the upper joint 2 and the pressing sleeve 3 connected with the continuous pipe connector are aligned with a lower joint 1 placed in the well mouth, the continuous pipe is slowly placed, the upper joint 2 is continuously close to the lower joint 1 placed in the well mouth, when a conical guide shoe 212 of the upper joint 2 enters an inner hole at the upper end of the lower joint 1, the conical guide shoe 212 can force the upper joint 2 and the lower joint 1 to be centered, the upper joint 2 continuously moves downwards, when an upper guide key 211 of a guide head 21 contacts a lower guide key 11 of the lower joint 1, the guide head 21 can be easily inserted into the lower joint 1 through the matching, and a torque bearing mechanism is formed, after the upper joint 2 is completely inserted, the continuous pipe is stopped to be placed, the pressing sleeve 3 is screwed downwards, when the limiting convex ring 22 of the upper joint 2 is clamped between the limiting step 31 of the pressing sleeve 3 and the upper end face of the lower joint 1, the limiting step 31 of the pressing sleeve 3 bears the weight of all pipe strings on the lower portion, a bearing structure is formed, a flow passage of an inner hole of the tool and a flow passage of an outer annular space of the tool are sealed and divided by the first sealing ring 4 and the second sealing ring 5, a sealing mechanism is formed, and therefore the connection of the lower tool string and the continuous pipe connector is completed.
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 (10)
1. A non-rotating joint for coiled tubing, comprising,
the upper end of the lower joint is hermetically penetrated with an upper joint, and the upper joint is provided with a guide head which can be inserted into the lower joint in a centering way;
the compressing sleeve is sleeved on the lower connector and provided with a limiting step capable of being abutted to the upper connector, and the compressing sleeve can compress the upper connector on the lower connector through the limiting step.
2. A non-rotating joint for a coiled tubing according to claim 1, wherein the guide head is provided with a plurality of upper guide keys at intervals along a circumferential direction thereof;
the inner wall of the lower joint is provided with a plurality of lower guide keys at intervals along the circumferential direction, guide grooves are formed between every two adjacent lower guide keys, and each upper guide key can be inserted into the corresponding guide groove.
3. The non-rotating joint for a continuous pipe according to claim 2, wherein the lower end of the upper guide key is formed with a V-shaped guide chamfer, and the upper end of the guide groove is formed with a V-shaped positioning chamfer, the V-shaped guide chamfer being insertable into the V-shaped positioning chamfer.
4. The non-rotating joint for the coiled tubing according to claim 1, wherein a limiting convex ring is provided on an outer wall of the upper joint, the limiting convex ring abuts against an upper end of the lower joint in a state where the guide head is inserted into the lower joint, the limiting step abuts against an upper end of the limiting convex ring, and the compression sleeve is connected to the lower joint.
5. A non-rotating joint for a coiled tubing according to claim 1 or 4, wherein the compression sleeve is screwed onto the lower joint.
6. The non-rotating joint for a coiled tubing according to claim 1, wherein the lower end of the guide head is formed with a tapered guide shoe, and the inner wall of the lower joint is formed with a tapered positioning step, and the tapered guide shoe can abut on the tapered positioning step.
7. The non-rotating coupling for coiled tubing of claim 6, wherein at least one first sealing ring is sealingly disposed between the tapered positioning step and the tapered guide.
8. The non-rotating joint for a coiled tubing of claim 1, wherein at least one second sealing ring is sealingly disposed between the lower joint and the guide head.
9. The non-rotating joint for a coiled tubing according to claim 1, wherein the lower end of the lower joint is provided with an external thread part.
10. The non-rotating joint for a coiled tubing according to claim 1, wherein an upper end of the upper joint is provided with an internal thread portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910398258.4A CN111946271A (en) | 2019-05-14 | 2019-05-14 | Non-rotary joint for continuous pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910398258.4A CN111946271A (en) | 2019-05-14 | 2019-05-14 | Non-rotary joint for continuous pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111946271A true CN111946271A (en) | 2020-11-17 |
Family
ID=73335896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910398258.4A Pending CN111946271A (en) | 2019-05-14 | 2019-05-14 | Non-rotary joint for continuous pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111946271A (en) |
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2019
- 2019-05-14 CN CN201910398258.4A patent/CN111946271A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20221222 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC ENGINEERING TECHNOLOGY R & D Co.,Ltd. Applicant after: BEIJING PETROLEUM MACHINERY Co.,Ltd. Address before: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Applicant before: CHINA NATIONAL PETROLEUM Corp. Applicant before: CNPC ENGINEERING TECHNOLOGY R & D Co.,Ltd. |
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| TA01 | Transfer of patent application right |