CN114293928B - Underground stable joint for plugging operation - Google Patents
Underground stable joint for plugging operation Download PDFInfo
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- CN114293928B CN114293928B CN202111630692.4A CN202111630692A CN114293928B CN 114293928 B CN114293928 B CN 114293928B CN 202111630692 A CN202111630692 A CN 202111630692A CN 114293928 B CN114293928 B CN 114293928B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention relates to the technical field of oil pipe connection in oil extraction engineering, in particular to an underground stable joint for plugging operation, wherein a high-elasticity rubber ring is sleeved in the middle of a middle working pipe column, the edges of the two side ends of the high-elasticity rubber ring are in sealing connection with the middle working pipe column, the middle working pipe column corresponds to a through hole at the position of the high-elasticity rubber ring, the outer wall of the middle working pipe column is respectively provided with a T-shaped channel close to the two ends, a T-shaped component is clamped in the T-shaped channel, a second spring is arranged in the T-shaped channel, the two ends of the second spring are respectively abutted to the tail end of the T-shaped channel and the T-shaped component, the T-shaped components on the two sides of the high-elasticity rubber ring are respectively connected through steel rings, a plurality of elastic steel sheets are in a long shape, and the two ends of the elastic steel sheets are respectively connected with the steel rings through first springs. The joint structure can solve the problem that the oil pipe collides with the inner wall of the casing when the plugging agent flows at a high speed.
Description
Technical Field
The invention relates to the technical field of oil pipe connection in oil extraction engineering, in particular to an underground stable joint for plugging operation.
Background
In recent years, as oil gas development is continued to be in depth, each large oil field gradually enters a middle-late stage of development, the technical condition of a shaft and the production contradiction are increasingly prominent, the exploitation difficulty is increased, and the problems of the underground operation technology are increased.
During the plugging operation, the high-speed flow and high pumping pressure of plugging agent fluid can cause vibration of the bottom of the tubing string during the process of pumping the plugging agent into the well bottom. The additional dynamic load generated by the vibration at the bottom of the oil pipe column can change the stress distribution of the oil pipe column, and the oil pipe impacts the inner wall of the sleeve under the action of the stress, so that the service lives of the oil pipe and the sleeve are shortened or other engineering accidents occur. For the above reasons, there is a need for a downhole tool that enables stable operation of the tubing during transportation of lost circulation.
Disclosure of Invention
In order to solve the problems, the invention provides a downhole stable joint for plugging operation, which can solve the problem that an oil pipe collides with the inner wall of a casing when plugging agent flows at a high speed.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a stable joint in pit for leaking stoppage operation, includes top connection, middle work tubular column, lower clutch, steel ring, high elastic rubber circle, elastic steel sheet, T type component, first spring and second spring, wherein top connection and lower clutch connect respectively at the both ends and inside intercommunication of middle work tubular column, high elastic rubber circle is the annular structure that has certain width, and high elastic rubber snare dress is in the middle part of middle work tubular column, and high elastic rubber circle's both sides tip edge and middle work tubular column sealing connection, and middle work tubular column corresponds high elastic rubber circle department and is equipped with the through-hole as leaking stoppage agent flow channel, the outer wall of middle work tubular column is close to both ends and is equipped with T type channel respectively, and the extending direction of this T type channel is the axial of middle work tubular column, and the end of T type channel extends to the middle part of middle work tubular column, T type component block dress is in T type channel, and T type component can be in T type channel along the axial direction slip of middle work tubular column, in the T type channel, and the both ends of second spring butt respectively on T type channel and the steel ring, the second spring is the long-shaped component is kept away from to the steel sheet through the both ends of a plurality of elastic steel sheet respectively to implement the long-shaped spring to the middle part through the steel sheet, and the long-shaped spring is connected to the both sides of T type tubular column respectively.
Preferably, a part of the T-shaped member protrudes out of the outer annular surface of the middle working string, and the steel ring penetrates through the part of the T-shaped member protruding out of the outer annular surface of the middle working string; the T-shaped component is provided with a through hole used for the steel ring to pass through, and the diameter of the through hole of the T-shaped component is consistent with that of the opening steel ring, so that the T-shaped component can not slide around the steel ring.
Preferably, the main body of the lower joint is of a conical structure, the maximum outer diameter of the lower joint is larger than the diameter of the middle working string, and the conical surface of the lower joint is provided with an external thread structure protruding out of the conical surface.
Preferably, the main body of the upper joint is of a tubular structure, and the inner annular surface of the upper joint is provided with internal threads.
Preferably, the through holes are a plurality of and evenly distributed at equal intervals around the circumference of the middle working string.
Preferably, the outer ring surface of the middle working string is provided with two inverted triangle grooves formed in the circumferential direction, two side end parts of the high-elasticity rubber ring are respectively embedded into the two inverted triangle grooves, and an annular sealing ring is arranged at the contact part of the high-elasticity rubber and the inverted triangle grooves.
Preferably, the inverted triangle groove is provided at a quarter length position and a three-quarter length position in the axial direction of the intermediate work string, respectively.
Preferably, the number of the elastic steel sheets is several, and the number of the elastic steel sheets is distributed at equal intervals; the T-shaped channels and the T-shaped members have a number of sets, and the number of elastic steel sheets is greater than the number of T-shaped members.
Preferably, the upper joint, the middle working string and the lower joint are integrally welded.
Preferably, the length of the T-channel is no more than one third of the length of the intermediate workstring.
The beneficial effects of using the invention are as follows:
according to the invention, the middle part of the working string is provided with the through hole, the through hole is wrapped by the high-elasticity rubber, the elastic steel sheet and the limiting device are additionally arranged outside the high-elasticity rubber to form the ball cage, and during the plugging operation, the plugging agent enters the high-elasticity rubber ring under the action of pressure difference, so that the high-elasticity rubber ring uniformly expands in the ball cage, fills the gap between a part of oil pipe and the sleeve, increases the stability of the oil pipe during the plugging operation, prevents the vibration of the oil pipe from colliding with the sleeve, thereby protecting the sleeve, prolonging the service life of the joint and the oil pipe, increasing the safety of the operation, and improving the conveying efficiency of the plugging agent.
Drawings
FIG. 1 is a schematic view of the structure of a downhole stabilizer joint for lost circulation operations of the present invention.
FIG. 2 is a schematic longitudinal cross-section of a downhole stabilizer joint for lost circulation operations according to the present invention.
Figure 3 is a schematic longitudinal cross-sectional view of the invention in an operational state of a stable downhole joint for lost circulation operations.
FIG. 4 is a schematic top view of an intermediate work string for a lost circulation sub-well stabilization joint according to the present invention.
The reference numerals include:
the device comprises a 1-upper joint, a 2-steel ring, a 3-T-shaped channel, a 4-inverted triangle groove, a 5-high elastic rubber ring, a 6-elastic steel sheet, a 7-middle working string, an 8-T-shaped component, a 9-first spring, a 10-through hole, a 11-annular sealing ring, a 12-second spring, a 13-lower joint, a 14-external thread and a 15-plugging agent.
Detailed Description
In order to make the objects, technical solutions and advantages of the present technical solution more apparent, the present technical solution is further described in detail below in conjunction with the specific embodiments. It should be understood that the description is only illustrative and is not intended to limit the scope of the present technical solution.
As shown in fig. 1-4, the present embodiment proposes a downhole stabilizing joint for plugging operation, comprising an upper joint 1, a middle working string 7, a lower joint 13, a steel ring 2, a high elastic rubber ring 5, an elastic steel sheet 6, a T-shaped member 8, a first spring 9 and a second spring 12, wherein the upper joint 1 and the lower joint 13 are respectively connected at two ends of the middle working string 7 and are mutually communicated, the high elastic rubber ring 5 is of an annular structure with a certain width, the high elastic rubber ring 5 is sleeved at the middle part of the middle working string 7, the edges of two side ends of the high elastic rubber ring 5 are in sealing connection with the middle working string 7, a through hole 10 serving as a flow channel of a plugging agent 15 is arranged at the position of the middle working string 7 corresponding to the high elastic rubber ring 5, a T-shaped channel 3 is respectively arranged at the two ends of the outer wall of the middle working string 7 near, the extending direction of the T-shaped channel 3 is the axial direction of the middle working string 7, the tail end of the T-shaped channel 3 extends towards the middle part of the middle working string 7, the T-shaped member 8 is clamped in the T-shaped channel 3, the T-shaped member 8 can slide in the T-shaped channel 3 along the axial direction of the middle working string 7, the second spring 12 is arranged in the T-shaped channel 3, the two ends of the second spring 12 are respectively abutted to the tail end of the T-shaped channel 3 and the T-shaped member 8, the second spring 12 is used for pushing the T-shaped member 8 away from the middle part of the middle working string 7, the T-shaped members 8 at the two sides of the high-elasticity rubber ring 5 are respectively connected through the steel rings 2, the elastic steel sheets 6 are in a plurality, the two ends of the elastic steel sheets 6 are respectively connected with the steel rings 2 through the first springs 9.
Part of the T-shaped member 8 protrudes out of the outer annular surface of the middle working string 7, and the steel ring 2 penetrates through the part of the T-shaped member 8 protruding out of the outer annular surface of the middle working string 7; the T-shaped member 8 is provided with a through hole 10 for the steel ring 2 to pass through, and the diameter of the through hole 10 of the T-shaped member 8 is consistent with that of the opening steel ring 2, so that the T-shaped member 8 cannot slide around the steel ring 2.
The main body of the lower joint 13 is of a conical structure, the maximum outer diameter of the lower joint 13 is larger than the diameter of the middle working string 7, and an external thread 14 protruding from the conical surface is arranged on the conical surface of the lower joint 13. The main body of the upper joint 1 is of a tubular structure, and the inner annular surface of the upper joint 1 is provided with internal threads.
The through holes 10 are a plurality of and evenly distributed at equal intervals around the circumference of the intermediate work string 7. The outer ring surface of the middle working string 7 is provided with two reverse triangular grooves 4 which are circumferentially arranged, the two side ends of the high-elasticity rubber ring 5 are respectively embedded into the two reverse triangular grooves 4, and the contact part of the high-elasticity rubber ring 5 and the reverse triangular grooves 4 is provided with an annular sealing ring 11.
The inverted triangle groove 4 is provided at a quarter length position and a three-quarter length position in the axial direction of the intermediate work string 7, respectively. The elastic steel sheets 6 are a plurality of, and the elastic steel sheets 6 are distributed at equal intervals; the T-shaped channels 3 and T-shaped members 8 have several groups and the number of elastic steel sheets 6 is greater than the number of T-shaped members 8.
The upper joint 1, the intermediate work string 7 and the lower joint 13 are welded integrally. The length of the T-channel 3 does not exceed one third of the length of the intermediate work string 7.
The specific structure and operation of the present joint structure will be described in detail below with reference to example 1.
Example 1
Referring to fig. 1 and 2, in the embodiment, an underground stable joint for plugging operation is provided, an upper joint 1 for connecting an oil pipe is a concave joint, an inner annulus is provided with threads inside the upper joint, the upper joint is used for connecting with the oil pipe joint, and the outer wall size of the upper joint 1 is larger than the outer wall size of an intermediate work string 7.
As shown in fig. 1, through holes 10 are formed in the middle position of the middle working string 7, the sizes of the through holes 10 are kept consistent, the through holes 10 are uniformly distributed around the circumference of the middle working string 7 at equal intervals, the purpose is to ensure that the flow velocity of the plugging agent 15 flowing through the through holes 10 is equal when the plugging agent 15 passes through the through holes 10 under the action of pressure difference, and the plugging agent 15 can enter the high-elasticity rubber ring 5 to uniformly expand under the action of the pressure difference, so that the gap between a joint and a sleeve is further filled.
Two annular closed inverted triangle grooves 4 surrounding the middle working string 7 are formed at the quarter length position and the three-quarter length position in the axial direction of the middle working string 7.
The high elastic rubber ring 5 is embedded into the inverted triangle groove 4, the high elastic rubber ring 5 is made of vinyl silicone resin serving as a main material, has high elasticity, and an annular sealing ring 11 is additionally arranged at the contact part of the high elastic rubber ring 5 and the inverted triangle groove 4 to prevent leakage blocking agent 15 from flowing out, the high elastic rubber ring 5 tightly wraps the middle working string 7 and completely covers the through hole 10 to wrap the leakage blocking agent 15 flowing out of the through hole 10, the high elastic rubber ring 5 expands under the filling of the leakage blocking agent 15, and the expanded size is larger than the diameter of a joint and is contacted with a sleeve, so that the fixing effect is achieved.
The depth of the annular inverted triangle groove 4 on the middle working string 7 is moderate, and the stability of the middle working string 7 is ensured; secondly, the high-elasticity rubber ring 5 is ensured not to fall off.
The middle working string 7 is provided with a plurality of T-shaped channels 3 communicated with the outside, and the T-shaped channels 3 are distributed at equal intervals around the circumference of the axis of the middle working string 7; each T-channel 3 starts from both ends of the intermediate work string 7 and extends in the axial direction of the intermediate work string 7, and the length of the T-channel 3 does not exceed one third of the length of the intermediate work string 7.
The bottom end of the T-shaped component 8 is provided with a through hole 10, and then the T-shaped component 8 is connected in series by using the opening steel ring 2, the T-shaped component 8 is distributed around the circumference of the steel ring 2 at intervals, and the interval angle is consistent with the angle of the T-shaped channel 3.
As shown in fig. 4, the opening steel ring 2 is welded to form a closed steel ring 2; the T-shaped member 8 is placed in the corresponding T-shaped channel 3, the first spring 9 is placed in the T-shaped channel 3 and positioned at the top of the T-shaped channel 3 and the middle of the T-shaped member 8, and two ends of the T-shaped member 8 are welded respectively; the upper steel ring 2 and the lower steel ring 2 are welded with the second springs 12 at equal intervals, the second springs 12 are distributed around the circumference of the steel ring 2 at intervals, the number of the second springs 12 is larger than that of the T-shaped components 8, and the elastic steel sheets 6 are welded between every two corresponding second springs 12.
In this embodiment, the upper joint 1, the intermediate work string 7, and the lower joint 13 are integrally welded.
As shown in fig. 3, the pressure difference is generated by the non-uniform flow velocity of the plugging agent 15 in the oil pipe, the plugging agent 15 is forced to flow out through the through hole 10, the high elastic rubber ring 5 expands due to the filling of the plugging agent 15, the elastic steel sheet 6 deforms along with the expansion of the high elastic rubber ring 5, the second spring 12 stretches to drive the T-shaped member 8 to slide along the axial direction of the T-shaped channel 3, and the first spring 9 is compressed to form an annular ball cage.
The ball cage can protect the high-elasticity rubber ring 5 and the sleeve from being damaged; the further ball cage can play a limiting role, so that the sliding between the high-elasticity rubber ring 5 and the sleeve is prevented; further strengthen the stability of joint, reduce oil pipe's vibration.
The sleeve has the problem of crack, and the high elastic rubber ring 5 can irregularly expand into the crack under the pressure of plugging agent 15, and the existence of the ball cage limits the irregular expansion of the high elastic rubber ring 5, further improves the stability of the joint.
When the flow rate in the oil pipe is gradually uniform and the pressure is gradually reduced, the first spring 9 stretches, the T-shaped member 8 slides to the original position under the action of the second spring 12, and the elastic steel sheet 6 is driven to reset; until no pressure difference exists, the first spring 9 and the second spring 12 are restored to the original states, and the plugging agent 15 in the high-elasticity rubber ring 5 is removed under the action of the second spring 12.
The foregoing is merely exemplary of the present invention, and those skilled in the art can make many variations in the specific embodiments and application scope according to the spirit of the present invention, as long as the variations do not depart from the spirit of the invention.
Claims (10)
1. The utility model provides a stable joint in pit for leaking stoppage operation which characterized in that: the high-elasticity rubber ring is of an annular structure with a certain width, the high-elasticity rubber ring is sleeved in the middle of the middle working pipe column, the edges of the two sides of the high-elasticity rubber ring are in sealing connection with the middle working pipe column, through holes serving as leaking stoppage agent flow channels are formed in the positions, corresponding to the high-elasticity rubber ring, of the middle working pipe column, T-shaped channels are formed in the positions, close to the two ends, of the outer wall of the middle working pipe column respectively, the extending direction of the T-shaped channels is the axial direction of the middle working pipe column, the tail ends of the T-shaped channels extend towards the middle of the middle working pipe column, the T-shaped components are clamped in the T-shaped channels, the T-shaped components can slide in the T-shaped channels along the axial direction of the middle working pipe column, the second springs are arranged in the T-shaped channels, the two ends of the second springs are respectively abutted to the tail ends of the T-shaped channels and the T-shaped components, the second springs are used for being connected with the two sides of the steel disc through the long steel rings, and the two sides of the second springs are respectively connected with the long steel rings.
2. A downhole stabilizing joint for lost circulation according to claim 1, wherein: the part of the T-shaped component protrudes out of the outer ring surface of the middle working string, and the steel ring penetrates through the part of the T-shaped component protruding out of the outer ring surface of the middle working string; the T-shaped component is provided with a through hole used for the steel ring to pass through, and the diameter of the through hole of the T-shaped component is consistent with that of the opening steel ring, so that the T-shaped component can not slide around the steel ring.
3. A downhole stabilizing joint for lost circulation according to claim 1, wherein: the main body of the lower joint is of a conical structure, the maximum outer diameter of the lower joint is larger than the diameter of the middle working string, and an external thread structure protruding out of the conical surface is arranged on the conical surface of the lower joint.
4. A downhole stabilizing joint for lost circulation according to claim 1, wherein: the main body of the upper joint is of a tubular structure, and the inner annular surface of the upper joint is provided with an internal thread.
5. A downhole stabilizing joint for lost circulation according to claim 1, wherein: the through holes are distributed uniformly at equal intervals around the circumference of the middle working string.
6. A downhole stabilizing joint for lost circulation according to claim 1, wherein: the outer ring surface of the middle working string is provided with two reverse triangular grooves formed in the circumferential direction, two side end parts of the high-elasticity rubber ring are respectively embedded into the two reverse triangular grooves, and an annular sealing ring is arranged at the contact part of the high-elasticity rubber and the reverse triangular grooves.
7. The downhole stabilizing joint for lost circulation according to claim 6, wherein: the inverted triangle grooves are respectively arranged at a quarter length position and a three-quarter length position in the axial direction of the middle working string.
8. A downhole stabilizing joint for lost circulation according to claim 1, wherein: the elastic steel sheets are distributed at equal intervals; the T-shaped channels and the T-shaped members have a number of sets, and the number of elastic steel sheets is greater than the number of T-shaped members.
9. A downhole stabilizing joint for lost circulation according to claim 1, wherein: and the upper joint, the middle working string and the lower joint are integrally welded.
10. A downhole stabilizing joint for lost circulation according to claim 1, wherein: the length of the T-shaped channel is not more than one third of the length of the middle working string.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111630692.4A CN114293928B (en) | 2021-12-28 | 2021-12-28 | Underground stable joint for plugging operation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111630692.4A CN114293928B (en) | 2021-12-28 | 2021-12-28 | Underground stable joint for plugging operation |
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| CN114293928A CN114293928A (en) | 2022-04-08 |
| CN114293928B true CN114293928B (en) | 2023-06-27 |
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| GB0409964D0 (en) * | 2004-05-05 | 2004-06-09 | Specialised Petroleum Serv Ltd | Improved packer |
| US20100175888A1 (en) * | 2008-08-15 | 2010-07-15 | Frank's International, Inc. | Downhole Device Actuator and Method |
| US8763688B2 (en) * | 2010-08-05 | 2014-07-01 | John Karl Webb, JR. | High pressure oil pipe bullet plug |
| US9175549B2 (en) * | 2011-06-06 | 2015-11-03 | Sumathi Paturu | Emergency salvage of a crumbled oceanic oil well |
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| CN111791457B (en) * | 2020-09-09 | 2020-11-20 | 东营鑫华莲石油机械有限公司 | External packer for casing |
| CN214221129U (en) * | 2020-10-27 | 2021-09-17 | 中国石油化工股份有限公司 | Hydraulic patching tubular column for underground screen pipe |
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| CN103410468A (en) * | 2013-07-08 | 2013-11-27 | 中国石油天然气股份有限公司 | Motive seal device for expansion pipe |
| CN104100239A (en) * | 2014-06-06 | 2014-10-15 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Atomizing device and foam discharging starting atomization water discharging gas recovery method thereof |
| CN112065322A (en) * | 2020-09-15 | 2020-12-11 | 东营市正能石油科技有限公司 | Wellhead Christmas tree |
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