CN112855041A - Safety joint for testing lower part of packer and releasing method thereof - Google Patents
Safety joint for testing lower part of packer and releasing method thereof Download PDFInfo
- Publication number
- CN112855041A CN112855041A CN202110263941.4A CN202110263941A CN112855041A CN 112855041 A CN112855041 A CN 112855041A CN 202110263941 A CN202110263941 A CN 202110263941A CN 112855041 A CN112855041 A CN 112855041A
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- CN
- China
- Prior art keywords
- spline
- joint
- packer
- outer cylinder
- testing
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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
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/06—Releasing-joints, e.g. safety joints
-
- 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 discloses a safety joint for testing the lower part of a packer, which comprises: a lower joint, one end of which is connected with the downhole tool; one end of the spline outer cylinder is detachably connected with the other end of the lower joint; one end of the upper joint is fixedly connected with the other end of the spline outer cylinder, and the other end of the upper joint is connected with a test pipe column; the spline mandrel is arranged in the spline outer cylinder in a matching mode, and one end of the spline mandrel is fixedly arranged in the lower joint; the shearing pin sleeve is arranged in the spline outer cylinder and is detachably connected with the spline outer cylinder, the other end of the spline mandrel is fixedly connected with one end of the shearing pin sleeve, and the other end of the shearing pin sleeve is in clearance connection with the upper joint; and the spring stacking mechanism is arranged outside the spline mandrel and can move axially along the spline mandrel. The problem that the underground tool cannot be pulled out in the test operation process can be solved. The invention also provides a method for testing the safety joint at the lower part of the packer by taking off the hand.
Description
Technical Field
The invention relates to a safety joint for testing the lower part of a packer and a releasing method thereof, belonging to the field of downhole operation tools in the petroleum industry.
Background
The safety joint is an indispensable auxiliary tool for underground operation, can reduce the harm of underground accidents, lightens the workload of handling the accidents, and improves the operation efficiency, thereby saving a large amount of labor and material cost.
The conventional safety joint in downhole operation has a Haributton RTTS safety joint, after a pipe column is lifted up to break a pull sleeve, the pipe column is lifted up and placed down and then matched with a right-handed pipe column to complete back-off, the back-off operation is complex, and along with the increase of the depth and the inclination of an operation well, the rigidity of the pipe column is poor, the friction resistance is high, so that the pipe column cannot be opened backwards on site to cause the test pipe column to be lifted out, and great economic loss is caused. According to the invention, by independently developing a novel packer lower part safety joint optimization tubular column hands-off operation method, the underground test tubular column hands-off method is simplified on the premise of guaranteeing the safety of underground test operation, and the reliability of the test tubular column is improved.
Disclosure of Invention
The invention designs and develops a safety joint for testing the lower part of a packer, which can overcome the problem that a downhole tool cannot be lifted out when a pipe column at the lower part of the packer meets a clamp in the testing operation process, ensure that the downhole tool can be smoothly unlocked, and reduce the operation failure risk caused by the fact that the testing tool falls into a well.
The technical scheme provided by the invention is as follows:
a safety joint for testing the lower portion of a packer comprising:
a lower joint, one end of which is connected with the downhole tool;
one end of the spline outer cylinder is detachably connected with the other end of the lower joint;
one end of the upper joint is fixedly connected with the other end of the spline outer cylinder, and the other end of the upper joint is connected with a test pipe column;
the spline mandrel is arranged in the spline outer cylinder in a matching mode, and one end of the spline mandrel is fixedly arranged in the lower joint;
the shearing pin sleeve is arranged in the spline outer cylinder and is detachably connected with the spline outer cylinder, the other end of the spline mandrel is fixedly connected with one end of the shearing pin sleeve, and the other end of the shearing pin sleeve is in clearance connection with the upper joint;
and the spring stacking mechanism is arranged outside the spline mandrel and can move axially along the spline mandrel.
Preferably, the other end of the lower joint is provided with an internal thread, and one end of the spline mandrel is provided with an external thread and is arranged at the internal thread in a matching manner.
Preferably, the method further comprises the following steps:
and the anti-rotating shear pin is inserted into the spline outer cylinder along the radial direction and is used for fixing the spline outer cylinder and the spline.
Preferably, the method further comprises the following steps:
a plurality of shear pins radially inserted into the spline outer barrel and the shear pin sleeves.
Preferably, the method further comprises the following steps:
the spring stacking upper seat is arranged on the spline mandrel along the circumferential direction and is close to the upper joint;
and the lower laminated spring seat is circumferentially arranged on the spline mandrel and is close to the lower joint, and the lower laminated spring seat can axially move along the spline mandrel.
Preferably, the number of shear pins is 9.
A hands-free method for testing a safety joint at a lower portion of a packer using the safety joint for testing a lower portion of a packer, comprising:
firstly, a test pipe column is lowered to a preset depth, and a packer is set to isolate the inside and the outside of the test pipe column;
step two, opening a test valve by annular pressurization and then detonating a perforating gun, and returning formation fluid to a wellhead from a test pipe column to perform well cleaning and production solving operation;
step three, if the perforating gun needs to be subjected to the string releasing operation when being clamped, lifting the string to unlock the safety joint, and keeping a certain lifting force to rotate the string positively to complete the tool releasing operation;
and step four, lifting the test pipe column to unseal the packer after the tool is released from the hand, and pulling out the test pipe column.
The invention has the following beneficial effects:
1. the structure is simple, the processing and the assembly are easy, and the maintenance is relatively easy;
2. the field operation is simple, and the structure is safe and reliable;
3. the method is suitable for various well conditions, particularly for deep wells, ultra-deep wells and wells with large inclination;
4. and the well falling risk of the underground tool is reduced, and the economic loss is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a safety joint for testing the lower portion of a packer according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
As shown in fig. 1, the present invention provides a safety joint for testing a lower portion of a packer, comprising: the upper joint 110, the spline outer cylinder 120, the shear pin sleeve 130, the shear pin 140, the stack spring upper seat 150, the stack spring 160, the stack spring lower seat 170, the spline mandrel 180 and the lower joint 190.
The whole of safety joint is cylindrical structure, and testing tool in the pit is connected to one end, and the operation tubular column is connected to the other end, and spline urceolus 120 sets up in the outside of safety joint, and testing tool in the pit is connected to the one end of lower clutch 190, and the one end of spline urceolus 120 is connected to the other end, and the other end of top connection 110 is connected the other end of spline urceolus 120, and the testing tubular column is linked to the other end of top connection 110. Spline dabber 180 matches the setting in the inside of spline urceolus 120, the fixed inside that sets up at lower clutch 190 of one end of spline dabber 180, the other end of spline dabber 180 and the one end fixed connection of shearing pin cover 130, it sets up the inside at spline urceolus 120 to shear pin cover 130 to can dismantle with spline urceolus 120 and be connected, in the outside of spline dabber 180, be provided with along circumference and fold the spring mechanism, it can be along 180 axial motion of spline dabber to fold the spring mechanism.
The upper joint 110 is in threaded connection with the spline mandrel, and one end of the upper joint 110 is provided with a structure of threads and a sealing groove, and a support seal and an O-shaped ring are arranged in the sealing groove. The inner control of the shear pin sleeve 130 is a thread and seal groove structure, one end of the shear pin sleeve 130 is in threaded connection with the other end of the spline mandrel 180, one end of the spline mandrel 180 is in threaded connection with the lower joint 190, and in the present invention, as a preferable mode, the spline mandrel 180 is in left-hand threaded connection with the lower joint 190.
The shear pin sleeve 130 is detachably connected with the spline outer cylinder 120 through a plurality of shear pins 140, in the present invention, preferably, 8 shear pins can be installed on the spline outer cylinder, and each shear pin 140 has about 10t force; the lower joint 190 and the spline outer cylinder 120 are inserted together, a U-shaped groove is formed in the lower end of the spline outer cylinder 120, a threaded hole is formed in the other end of the lower joint 190, the threaded hole is connected with an anti-rotation shear pin, and the anti-rotation shear pin can axially and freely move in the U-shaped groove in the spline outer cylinder 120. The anti-shear pin is radially inserted into the spline outer cylinder 120 for fixing the spline outer cylinder 120 and the lower joint 190. The stack spring upper seat is circumferentially arranged on the spline mandrel 180 and close to the upper joint 110, the stack spring lower seat is circumferentially arranged on the spline mandrel 180 and close to the lower joint 190, and the stack spring lower seat can circumferentially move along the spline mandrel 180.
The safety joint is normally connected to be used in a pipe string, the number of the shear pins 140 can be selected according to specific process parameters of the pipe string, and the shear pins 140 need to bear the weight of the pipe string at the lower end of a tool, so that the maximum number of the shear pins 140 can be 8, and the maximum force of 800KN can be provided. The torque of the pipe column is transmitted through the spline outer barrel and the spline pair on the spline mandrel, and then is transmitted to the lower end of the tool through the lower joint. The function of the wiping ring installed on the disc spring lower seat 170 is to prevent impurities and the like from entering the disc spring installation space, thereby affecting the compression of the disc spring. The inner cavity of the tool is sealed by adopting a method of double-support sealing and O-shaped rings, and the sealing is very reliable.
When the lower end of the tool needs to be reversely buckled when the lower end of the tool meets a clamp, the pipe column is lifted, the shear pin 140 is sheared, the lifting force is kept, the disc spring 160 is compressed, the anti-rotation shear pin is separated from the U-shaped groove of the spline outer cylinder 120, the lifting force is kept, the pipe column is rotated by about 10 circles, and the pipe column releasing is completed.
The disc spring 160 of the present invention is used to prevent the shear pin 140 from being accidentally cut off, and the disc spring 160 also provides a sufficient force to ensure that the anti-rotation shear pin 140 cannot be separated from the U-shaped groove of the spline outer cylinder.
The invention also provides a method for testing the safety joint at the lower part of the packer by taking off the hand, which comprises the following steps of:
step one, the testing pipe column is lowered to a preset depth, and the packer is set to enable the testing pipe column to be isolated from the inside and the outside.
And step two, opening the test valve by annular pressurization and then detonating the perforating gun, and returning formation fluid to a wellhead from the test pipe column to perform well cleaning and production seeking operation.
And step three, if the perforating gun needs to be subjected to the string releasing operation when being clamped, lifting the string to unlock the safety joint, and keeping a certain lifting force to rotate the string positively to complete the tool releasing operation.
And step four, lifting the test pipe column to unseal the packer after the tool is released from the hand, and pulling out the test pipe column.
The invention simplifies the operation procedure of the releasing tool, can realize releasing by lifting the forward rotation pipe column, ensures that the pipe column can be smoothly released when the perforating gun or other tools at the lower part of the packer are blocked, and reduces the operation failure risk caused by the falling of the testing tool into the well.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (7)
1. A safety joint for testing the lower portion of a packer, comprising:
a lower joint, one end of which is connected with the downhole tool;
one end of the spline outer cylinder is detachably connected with the other end of the lower joint;
one end of the upper joint is fixedly connected with the other end of the spline outer cylinder, and the other end of the upper joint is connected with a test pipe column;
the spline mandrel is arranged in the spline outer cylinder in a matching mode, and one end of the spline mandrel is fixedly arranged in the lower joint;
the shearing pin sleeve is arranged in the spline outer cylinder and is detachably connected with the spline outer cylinder, the other end of the spline mandrel is fixedly connected with one end of the shearing pin sleeve, and the other end of the shearing pin sleeve is in clearance connection with the upper joint;
and the spring stacking mechanism is arranged outside the spline mandrel and can move axially along the spline mandrel.
2. The safety joint for testing the lower part of a packer as claimed in claim 1, wherein the other end of the lower joint is provided with an internal thread, and one end of the spline mandrel is provided with an external thread and is arranged at the internal thread in a matching way.
3. A safety joint for testing the lower portion of a packer as claimed in claim 2, further comprising:
and the anti-rotation shear pin is inserted into the spline outer cylinder along the radial direction and is used for fixing the spline outer cylinder and the lower joint.
4. A safety joint for testing the lower portion of a packer as claimed in claim 3, further comprising:
a plurality of shear pins radially inserted into the spline outer barrel and the shear pin sleeves.
5. The safety joint for testing the lower portion of a packer of claim 4, further comprising:
the spring stacking upper seat is arranged on the spline mandrel along the circumferential direction and is close to the upper joint;
and the lower laminated spring seat is circumferentially arranged on the spline mandrel and is close to the lower joint, and the lower laminated spring seat can axially move along the spline mandrel.
6. A safety joint for testing the lower portion of a packer as claimed in claim 5, wherein the number of shear pins is 8.
7. A method of releasing a safety joint for testing a lower portion of a packer, using the safety joint for testing a lower portion of a packer according to any one of claims 1 to 6, comprising:
firstly, a test pipe column is lowered to a preset depth, and a packer is set to isolate the inside and the outside of the test pipe column;
step two, opening a test valve by annular pressurization and then detonating a perforating gun, and returning formation fluid to a wellhead from a test pipe column to perform well cleaning and production solving operation;
step three, if the perforating gun needs to be subjected to the string releasing operation when being clamped, lifting the string to unlock the safety joint, and keeping a certain lifting force to rotate the string positively to complete the tool releasing operation;
and step four, lifting the test pipe column to unseal the packer after the tool is released from the hand, and pulling out the test pipe column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110263941.4A CN112855041B (en) | 2021-03-11 | 2021-03-11 | Safety joint for testing lower part of packer and releasing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110263941.4A CN112855041B (en) | 2021-03-11 | 2021-03-11 | Safety joint for testing lower part of packer and releasing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112855041A true CN112855041A (en) | 2021-05-28 |
| CN112855041B CN112855041B (en) | 2023-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110263941.4A Active CN112855041B (en) | 2021-03-11 | 2021-03-11 | Safety joint for testing lower part of packer and releasing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112855041B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070209803A1 (en) * | 2006-03-10 | 2007-09-13 | De Clute-Melancon Daniel A | Safety joint |
| CN201007186Y (en) * | 2007-02-06 | 2008-01-16 | 大港油田集团有限责任公司 | Lifting safety joint |
| CN201212360Y (en) * | 2008-06-18 | 2009-03-25 | 北京华油油气技术开发有限公司 | Ring-releasing safety joint |
| CN101793127A (en) * | 2009-12-24 | 2010-08-04 | 张键 | Anti-tripping reverse buckling device |
| CN201802321U (en) * | 2010-09-28 | 2011-04-20 | 中国石油集团川庆钻探工程有限公司 | Safe joint for testing tubular column tail tube |
| CN201943597U (en) * | 2010-12-17 | 2011-08-24 | 中国石油天然气股份有限公司 | Hydraulic safety connector |
| CN110671061A (en) * | 2019-11-13 | 2020-01-10 | 东营市瑞丰石油技术发展有限责任公司 | Safety joint and tubular column |
-
2021
- 2021-03-11 CN CN202110263941.4A patent/CN112855041B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070209803A1 (en) * | 2006-03-10 | 2007-09-13 | De Clute-Melancon Daniel A | Safety joint |
| CN201007186Y (en) * | 2007-02-06 | 2008-01-16 | 大港油田集团有限责任公司 | Lifting safety joint |
| CN201212360Y (en) * | 2008-06-18 | 2009-03-25 | 北京华油油气技术开发有限公司 | Ring-releasing safety joint |
| CN101793127A (en) * | 2009-12-24 | 2010-08-04 | 张键 | Anti-tripping reverse buckling device |
| CN201802321U (en) * | 2010-09-28 | 2011-04-20 | 中国石油集团川庆钻探工程有限公司 | Safe joint for testing tubular column tail tube |
| CN201943597U (en) * | 2010-12-17 | 2011-08-24 | 中国石油天然气股份有限公司 | Hydraulic safety connector |
| CN110671061A (en) * | 2019-11-13 | 2020-01-10 | 东营市瑞丰石油技术发展有限责任公司 | Safety joint and tubular column |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112855041B (en) | 2023-03-31 |
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