CN114293941A - Nitrogen accelerator and acceleration method thereof - Google Patents
Nitrogen accelerator and acceleration method thereof Download PDFInfo
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- CN114293941A CN114293941A CN202111643126.7A CN202111643126A CN114293941A CN 114293941 A CN114293941 A CN 114293941A CN 202111643126 A CN202111643126 A CN 202111643126A CN 114293941 A CN114293941 A CN 114293941A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 211
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000001133 acceleration Effects 0.000 title claims description 8
- 239000004568 cement Substances 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 55
- 238000007906 compression Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 230000005489 elastic deformation Effects 0.000 claims description 3
- 238000005381 potential energy Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 26
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000011324 bead Substances 0.000 description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001973 fluoroelastomer Polymers 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention discloses a nitrogen accelerator and an accelerating method thereof, wherein the nitrogen accelerator comprises an internal moving pipe fitting and an external non-moving pipe fitting, the internal moving pipe fitting comprises an upper joint, a connecting sleeve, a mandrel and a piston, the upper joint is in threaded connection with the upper end of the connecting sleeve, the lower end of the connecting sleeve is in threaded connection with the upper end of the mandrel, and the piston is fixedly connected to the outer wall of the mandrel; the external non-moving pipe fitting comprises an inner spline sleeve, an upper cylinder barrel, a lower cylinder barrel and a lower joint, wherein the lower end of the inner spline sleeve is in threaded connection with the upper end of the upper cylinder barrel, the lower end of the upper cylinder barrel is in threaded connection with the upper end of the lower cylinder barrel, and the lower end of the lower cylinder barrel is in threaded connection with the lower joint. The invention can generate stronger shock force to the stuck point, the shock force is increased by 2 to 3 times compared with the shock force without the nitrogen accelerator, simultaneously, the invention can slow down the shock of the rebound of the tubular column after the shock, has protective effect on the underground tubular column and the cement sheath, and is beneficial to improving the well repairing quality.
Description
Technical Field
The invention relates to a nitrogen accelerator and an accelerating method thereof, belonging to the technical field of stuck freeing during stuck drilling of an oil well.
Background
Because the well repairing jar is limited by factors such as the size of a well hole, the strength of a drill column and the like, the rated working tension of the well repairing jar is restricted, and the jar impact force of the jar is difficult to increase. Meanwhile, the impact of the shocking force on the derrick and a lifting system in a shallow well is serious, the friction force of the well wall in a bent well bore can greatly weaken the shocking effect of the shocking force, and the shortage of the shocking force of the jar can be made up by matching and using an accelerator.
The existing shock accelerator is usually hydraulic, and a hydraulic cavity is filled with compressible silicone oil. The piston of the accelerator is also driven while the drill string is pulled, the silicon oil is compressed to store energy, a strong assisting force is additionally provided when the drill string is released like a liquid spring which is connected in series, the defect that the elasticity curve of the silicon oil of the hydraulic accelerator is parabolic (the rigidity of the hydraulic accelerator is the linear part of the rigidity), and for more energy storage, the length of a hydraulic cavity is longer, so that the length of a hydraulic cylinder and a mandrel part is also longer, and the processing difficulty is increased.
Disclosure of Invention
The invention aims to provide a nitrogen accelerator and an acceleration method thereof, wherein the nitrogen accelerator can be used for accelerating a drill collar below the nitrogen accelerator and an upper pipe column of an upper shock absorber, can generate stronger shock force to a clamping point, the shock force is increased by 2-3 times compared with that of the nitrogen accelerator without being connected, and simultaneously can slow down the shock of the rebound pipe column after shock, protect an underground pipe column and a cement ring, and is favorable for improving the well repairing quality.
The technical scheme of the invention is as follows: a nitrogen accelerator comprises an internal moving pipe fitting and an external non-moving pipe fitting, wherein the internal moving pipe fitting comprises an upper joint, a connecting sleeve, a mandrel and a piston, the upper joint is in threaded connection with the upper end of the connecting sleeve, the lower end of the connecting sleeve is in threaded connection with the upper end of the mandrel, and the piston is fixedly connected to the outer wall of the mandrel; the external non-moving pipe fitting comprises an internal spline sleeve, an upper cylinder barrel, a lower cylinder barrel and a lower joint, wherein the lower end of the internal spline sleeve is in threaded connection with the upper end of the upper cylinder barrel, the lower end of the upper cylinder barrel is in threaded connection with the upper end of the lower cylinder barrel, and the lower end of the lower cylinder barrel is in threaded connection with the lower joint; the outer wall of the lower portion of the upper joint is in sliding fit with the inner wall of the inner spline sleeve, the upper portion of the outer wall of the mandrel is in sliding fit with the upper portion of the inner wall of the lower cylinder barrel, the lower portion of the outer wall of the mandrel is in sliding fit with the upper portion of the inner wall of the lower joint, a nitrogen cavity is formed in the middle of the inner wall of the lower cylinder barrel, nitrogen is filled in the nitrogen cavity, and the outer wall of the piston is in sliding fit with the inner wall of the middle of the lower cylinder barrel.
Further, an outer spline in sliding fit with the inner spline housing is arranged on the outer wall of the lower portion of the upper joint.
Further, supreme one-level circular bead external screw thread, second grade circular bead excircle and the tertiary circular bead excircle of being equipped with in proper order on the middle part outer wall of mandrel from bottom to top, threaded connection has the position sleeve on one-level circular bead external screw thread, and the cover has the piston on the second grade circular bead excircle, and the piston is spacing between position sleeve and tertiary circular bead excircle.
Furthermore, the outer wall of the piston and the outer circle of the secondary shoulder are respectively provided with a first hole Y-shaped sealing ring and a second hole Y-shaped sealing ring, the first hole Y-shaped sealing ring and the second hole Y-shaped sealing ring are arranged in a back-to-back mode, the opening of the first hole Y-shaped sealing ring faces the nitrogen cavity, and the opening of the second hole Y-shaped sealing ring faces the lower connector.
Further, be provided with upper portion excircle circular bead on the outer wall of upper clutch, and the upper end of internally splined sleeve is spacing through upper portion excircle circular bead, installs first O shape circle and sealing washer subassembly respectively on the inner wall upper portion of internally splined sleeve.
Furthermore, the sealing ring assembly comprises a second O-shaped ring, and a diagonal check ring which are symmetrically arranged on two sides of the second O-shaped ring.
Furthermore, the upper part of the inner wall of the lower cylinder barrel and the upper part of the inner wall of the lower joint are respectively provided with a scraper and a Y-shaped sealing ring for the shaft.
Further, an upper air hole communicated with the nitrogen cavity is formed in the side wall of the lower cylinder barrel, a lower air hole communicated with the nitrogen cavity is formed in the side wall of the lower joint, and an air plug and a plug are respectively in threaded connection with inlets of the upper air hole and the lower air hole.
Meanwhile, the invention also provides an accelerating method based on the nitrogen accelerator, firstly, the nitrogen accelerator is connected on the upper jar knocker through the upper joint, then nitrogen with certain pressure is filled in the nitrogen cavity of the lower cylinder barrel, when the upper jar knocker is in a stretching-delaying stage when the upper pipe column is stretched, the pipe column is stretched to generate elastic deformation, the mandrel of the nitrogen accelerator and the piston also move from bottom to top relative to the lower cylinder barrel under the action of tensile force, so that the nitrogen in the lower cylinder barrel is compressed to store energy, when the upper jar knocker goes through a delaying stroke and the piston enters the jar cavity, the mandrel system of the upper jar knocker enters a free stroke state, the energy stored by the nitrogen accelerator and the elastic potential energy of the pipe column are suddenly released together to drive the impact head on the mandrel of the upper jar knocker to impact upwards instantly, and generate stronger impact force on a stuck point, the shock power is increased by 2 to 3 times compared with the shock power without a nitrogen accelerator, and meanwhile, the shock caused by the rebound of the post-shock tubular column can be relieved, so that the underground tubular column and the cement sheath are protected, and the well repairing quality is improved.
In the method, the initial pressure of the nitrogen in the nitrogen cavity is 15MPa, the compression ratio is 1.3, and the maximum working pressure is 19.5 MPa.
Due to the adoption of the technical scheme, the invention has the advantages that:
1. when the device works, the nitrogen accelerator can be butted between the drill collar and the upper shock jar to play a role in acceleration, stronger shock force can be generated on a clamping point, the shock force is increased by 2 to 3 times compared with the shock force generated when the nitrogen accelerator is not connected, the shock of the tubular column after shock during rebounding can be relieved, the underground tubular column and a cement sheath are protected, the well repairing quality is favorably improved, the nitrogen accelerator is matched and used for effectively improving the success rate of the shock jam release, and the nitrogen accelerator can enable the shock force to be ten times of the weight of the drill collar in the tubular column assembly;
2. the elastic curve of the nitrogen spring of the nitrogen accelerator is gentle, so that the initial elastic pressure and the pressure increment can be designed according to the actual application requirement, the initial elastic pressure is very large before the operation, precompression is not needed, and the relatively constant elastic pressure which is not limited by the stroke length can be provided;
3. the invention can greatly shorten the length of the nitrogen accelerator, shorten the total length of the shock accelerator, save materials and reduce the processing risk.
4. According to the structure of the nitrogen accelerator, the length of the hydraulic cavity is shorter, so that the lengths of the hydraulic cylinder and the mandrel part are reduced by 35% compared with the lengths of the hydraulic cylinder and the mandrel part of the hydraulic accelerator, and the processing difficulty is reduced.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is an enlarged view at E of FIG. 1;
FIG. 4 is a view showing the construction of a Y-shaped seal ring for a shaft;
FIG. 5 is a view showing the construction of a Y-shaped grommet for a hole;
fig. 6 is a graph showing the spring force characteristics of the elastic member.
Description of reference numerals: 1-an upper joint, 2-an internal spline sleeve, 3-a connecting sleeve, 4-a mandrel, 5-an upper cylinder barrel, 6-a lower cylinder barrel, 7-a positioning sleeve and 8-a piston; 9-lower joint; 10-a first O-ring; 11-a second O-ring; 12-inclined retainer ring; 13-a gasket; 14-a third O-ring; 15-scraper; 16-shaft Y-shaped sealing ring; 17-a Y-shaped seal ring for the first hole; 18-second hole use Y-shaped seal ring; 19-air blocking; 20-plug; 21-nitrogen chamber.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.
The embodiment of the invention comprises the following steps: the nitrogen accelerator and the acceleration method thereof have the structural schematic diagrams shown in fig. 1-3, and comprise an internal moving pipe fitting and an external non-moving pipe fitting, wherein the internal moving pipe fitting comprises an upper joint 1, a connecting sleeve 3, a mandrel 4 and a piston 8, the upper joint 1 is in threaded connection with the upper end of the connecting sleeve 3, the lower end of the connecting sleeve 3 is in threaded connection with the upper end of the mandrel 4, and the piston 8 is fixedly connected to the outer wall of the mandrel 4; the external non-moving pipe fitting comprises an internal spline housing 2, an upper cylinder barrel 5, a lower cylinder barrel 6 and a lower joint 9, wherein the lower end of the internal spline housing 2 is in threaded connection with the upper end of the upper cylinder barrel 5, the lower end of the upper cylinder barrel 5 is in threaded connection with the upper end of the lower cylinder barrel 6, and the lower end of the lower cylinder barrel 6 is in threaded connection with the lower joint 9; the outer wall of the lower portion of the upper joint 1 is in sliding fit with the inner wall of the inner spline sleeve 2, the upper portion of the outer wall of the mandrel 4 is in sliding fit with the upper portion of the inner wall of the lower cylinder 6, the lower portion of the outer wall of the mandrel 4 is in sliding fit with the upper portion of the inner wall of the lower joint 9, a nitrogen cavity 21 is formed in the middle of the inner wall of the lower cylinder 6, nitrogen is filled in the nitrogen cavity 21, and the outer wall of the piston 8 is in sliding fit with the middle of the inner wall of the lower cylinder 6.
The outer wall of the lower part of the upper joint 1 is provided with an external spline which is in sliding fit with the internal spline housing 2, so that an internal moving pipe fitting and an external non-moving pipe fitting can be assembled into a whole through the spline structures of the upper joint 1 and the internal spline housing 2, and the nitrogen accelerator can transmit torque and can rotate along with a drill string.
The utility model discloses a three-stage circular bead, including mandrel 4, one-level circular bead external screw thread, second grade circular bead excircle and tertiary circular bead excircle are equipped with in proper order on the middle part outer wall of mandrel 4 by supreme down, and threaded connection has position sleeve 7 on one-level circular bead external screw thread, and the cover has piston 8 on the second grade circular bead excircle, and piston 8 position is spacing between position sleeve 7 and tertiary circular bead excircle, designs tertiary circular bead not only simple to operate, can firmly fix piston 8 moreover, guarantees the stability of its work.
An upper air hole communicated with the nitrogen cavity 21 is formed in the side wall of the lower cylinder barrel 6, a lower air hole communicated with the nitrogen cavity 21 is formed in the side wall of the lower joint 9, and an air plug 19 and a plug 20 are respectively in threaded connection with inlets of the upper air hole and the lower air hole and used for filling or discharging nitrogen.
In order to improve the sealing effect, a first hole-use Y-shaped sealing ring 17 and a second hole-use Y-shaped sealing ring 18 are respectively installed on the outer wall of the piston 8 and the outer circle of the secondary shoulder, and the first hole-use Y-shaped sealing ring 17 and the second hole-use Y-shaped sealing ring 18 are installed back to back. The opening of the Y-shaped sealing ring for the first hole faces the nitrogen gas cavity, and the opening of the Y-shaped sealing ring for the second hole faces the lower joint. Be provided with upper portion excircle circular bead on the outer wall of top connection 1, and the upper end of internally splined sleeve 2 is spacing through upper portion excircle circular bead, installs first O shape circle 10 and sealing washer subassembly respectively on the inner wall upper portion of internally splined sleeve 2. The sealing ring assembly comprises a second O-shaped ring 11, and a inclined retainer ring 13 and an inclined retainer ring 12 which are symmetrically arranged at two sides of the second O-shaped ring 11. And a scraper 15 and a Y-shaped sealing ring 16 for a shaft are respectively arranged on the upper part of the inner wall of the lower cylinder barrel 6 and the upper part of the inner wall of the lower joint 9.
According to the sealing design principle of the nitrogen spring, the Y-shaped sealing ring is adopted for sealing, and the Y-shaped sealing ring is a lip-shaped sealing ring. The structure is divided into two forms of shaft and hole according to the different installation positions, and the structure forms are shown in fig. 4 and 5. When the Y-shaped sealing ring is assembled in the groove, the Y-shaped sealing ring has a self-sealing function, namely, the initial sealing can be realized by means of the extrusion deformation of the groove and the mandrel to the lip of the Y-shaped sealing ring during pre-compression under the condition of not bearing the pressure of nitrogen. After the nitrogen is filled, the sealing performance of the Y-shaped sealing ring is more reliable along with the increase of the pressure of the nitrogen, and the Y-shaped sealing ring has smaller friction resistance and is applied to a reciprocating motion sealing structure.
The Y-shaped sealing ring is made of fluororubber, the hardness range is 85-90 HA, the fluororubber Y-shaped sealing ring meets the air sealing principle in a nitrogen gas filling static sealing state, and the larger the deformation resistance of the Y-shaped sealing ring is along with the increase of pressure, namely the shearing fatigue resistance is gradually increased; along with the increase of the pressure, the maximum contact pressure is gradually increased, which shows that the sealing capacity of the Y-shaped sealing ring is gradually increased, and the sealing performance is reliable.
The invention fills nitrogen with certain pressure in the nitrogen chamber 21 of the lower cylinder 6 to form a nitrogen spring, the nitrogen spring is a plunger type independent nitrogen spring, the core parts of the dynamic sealing structure are a mandrel, a lower cylinder sleeve and a Y-shaped sealing ring, the initial inflation pressure of the nitrogen spring is 15MPa, the compression ratio is 1.3, and the pressure of the nitrogen in the lower cylinder sleeve is 19.5MPa when the mandrel of the nitrogen spring is in a compressed state. The whole dynamic sealing structure consisting of the mandrel of the nitrogen spring, the lower cylinder sleeve and the Y-shaped sealing ring is of a three-dimensional axisymmetric structure.
The operation with a nitrogen spring, which can be considered approximately as an isothermal expansion and compression process, must follow the boeing-markov equation of state of gases. PV/T ═ C, P1 × V1 ═ P2 × V2, and the vibration frequency f of the nitrogen spring was less than 0.2Hz, at which time the stiffness was considered to be static stiffness and changed linearly, and the spring pressure characteristic curve was gentle, as shown in fig. 6. The elastic force curve of a nitrogen spring of the nitrogen accelerator is gentle, and the maximum characteristic is that the initial elastic force is already large before work, and pre-compression is not needed. The initial spring pressure and the pressure increment can be determined according to actual needs, the spring pressure can be adjusted through the initial inflation pressure, and the relatively constant spring pressure which is not limited by the stroke length can be provided. The acceleration of the whole nitrogen accelerator can be artificially controlled, and the nitrogen accelerator is more practical. Compared with metal spring and silicon oil spring, the nitrogen spring has the advantages of small volume, large elasticity, short stroke, stable work, precise manufacture and long service life
The spring pressure characteristic curves of different springs are shown in figure 6, and compared with a conventional elastic element, the nitrogen spring has the advantages of being gentle in spring pressure characteristic curve, not needing pre-tightening and the like. It has the work that conventional elastic elements such as a steel wire spring, a silicone oil spring and the like are difficult to complete. The design and the manufacture of the nitrogen accelerator can be simplified, the installation and the adjustment of the nitrogen accelerator are convenient, the service life of the nitrogen accelerator is prolonged, and the quality stability of the nitrogen accelerator is ensured. It can conveniently realize the constant pressure and time-delay action in the jar system, and is an ideal nitrogen accelerator for underground jar acceleration.
The working principle of the invention is as follows:
firstly, a nitrogen accelerator is connected to an upper jar knocker through an upper connector 1, then 15MPa of nitrogen is filled into a nitrogen cavity 21 of a lower cylinder 6, the contraction ratio is 1.3, a nitrogen spring is formed, when an upper drill string is pulled, the jar is in a stretching-delaying stage, at the moment, a pipe column is pulled to generate elastic deformation, a mandrel 4 and a piston 8 of the nitrogen accelerator also move upwards relative to the lower cylinder 6 under the action of tension, so that the nitrogen in the lower cylinder 6 is compressed to store energy, the nitrogen pressure is 19.5MPa, when the upper jar knocker finishes a delaying stroke and the piston 8 enters a jar cavity, an upper jar knocker mandrel system enters a free stroke state, the energy accumulated by the nitrogen accelerator and the elastic potential energy of the pipe column are suddenly released to drive a knocking head on the upper jar knocker mandrel to impact upwards instantaneously, and generate stronger knocking force on a stuck point, the shock power is increased by 2 to 3 times compared with the shock power without a nitrogen accelerator, and meanwhile, the shock caused by the rebound of the post-shock tubular column can be relieved, so that the underground tubular column and the cement sheath are protected, and the well repairing quality is improved.
After the impact is completed, the nitrogen spring of the nitrogen accelerator is restored to the initial position, the mandrel 4 and the piston 8 are returned to the closed position of the nitrogen accelerator, and the nitrogen spring is in a locking state.
Claims (10)
1. A nitrogen accelerator, includes inside motion pipe fitting and outside non-motion pipe fitting, its characterized in that: the internal moving pipe fitting comprises an upper joint (1), a connecting sleeve (3), a mandrel (4) and a piston (8), wherein the upper joint (1) is in threaded connection with the upper end of the connecting sleeve (3), the lower end of the connecting sleeve (3) is in threaded connection with the upper end of the mandrel (4), and the piston (8) is fixedly connected to the outer wall of the mandrel (4); the external non-moving pipe fitting comprises an inner spline sleeve (2), an upper cylinder (5), a lower cylinder (6) and a lower joint (9), wherein the lower end of the inner spline sleeve (2) is in threaded connection with the upper end of the upper cylinder (5), the lower end of the upper cylinder (5) is in threaded connection with the upper end of the lower cylinder (6), and the lower end of the lower cylinder (6) is in threaded connection with the lower joint (9); the inner wall sliding fit of the lower part outer wall of the upper joint (1) and the inner spline sleeve (2), the outer wall upper portion of the mandrel (4) and the inner wall upper portion of the lower cylinder barrel (6) are in sliding fit, meanwhile, the outer wall lower portion of the mandrel (4) and the inner wall upper portion of the lower joint (9) are in sliding fit, a nitrogen gas cavity (21) is formed in the middle of the inner wall of the lower cylinder barrel (6), nitrogen gas is filled in the nitrogen gas cavity (21), and the inner wall middle portion of the outer wall of the piston (8) and the inner wall of the lower cylinder barrel (6) is in sliding fit.
2. The nitrogen accelerator of claim 1, wherein: and an external spline in sliding fit with the internal spline housing (2) is arranged on the outer wall of the lower part of the upper joint (1).
3. The nitrogen accelerator of claim 1, wherein: the mandrel is characterized in that a first-stage shoulder external thread, a second-stage shoulder external circle and a third-stage shoulder external circle are sequentially arranged on the outer wall of the middle part of the mandrel (4) from bottom to top, a positioning sleeve (7) is in threaded connection with the first-stage shoulder external thread, a piston (8) is sleeved on the second-stage shoulder external circle, and the piston (8) is limited between the positioning sleeve (7) and the third-stage shoulder external circle.
4. The nitrogen accelerator of claim 3, wherein: and the outer wall of the piston (8) and the excircle of the secondary shoulder are respectively provided with a first Y-shaped sealing ring (17) for holes and a second Y-shaped sealing ring (18) for holes, the first Y-shaped sealing ring (17) for holes and the second Y-shaped sealing ring (18) for holes are arranged in a back-to-back manner, the opening of the first Y-shaped sealing ring (17) for holes faces a nitrogen cavity (21), and the opening of the second Y-shaped sealing ring (18) for holes faces a lower joint (9).
5. The nitrogen accelerator of claim 1, wherein: the outer wall of the upper joint (1) is provided with an upper outer circular shoulder, the upper end of the inner spline sleeve (2) is limited through the upper outer circular shoulder, and the upper portion of the inner wall of the inner spline sleeve (2) is provided with a first O-shaped ring (10) and a sealing ring assembly respectively.
6. The nitrogen accelerator of claim 5, wherein: the sealing ring assembly comprises a second O-shaped ring (11), and an inclined retainer ring (13) and an inclined retainer ring (12) which are symmetrically arranged on two sides of the second O-shaped ring (11).
7. The nitrogen accelerator of claim 1, wherein: and the upper part of the inner wall of the lower cylinder barrel (6) and the upper part of the inner wall of the lower joint (9) are respectively provided with a scraper (15) and a Y-shaped sealing ring (16) for a shaft.
8. The nitrogen accelerator of claim 1, wherein: an upper air hole communicated with the nitrogen cavity (21) is formed in the side wall of the lower cylinder barrel (6), a lower air hole communicated with the nitrogen cavity (21) is formed in the side wall of the lower connector (9), and an air plug (19) and a plug (20) are respectively in threaded connection with inlets of the upper air hole and the lower air hole.
9. An acceleration method of a nitrogen accelerator according to any one of claims 1 to 8, characterized in that: firstly, a nitrogen accelerator is connected to an upper jar knocker through an upper connector (1), then nitrogen with certain pressure is filled into a nitrogen cavity (21) of a lower cylinder barrel (6), when an upper drill string is pulled, the upper jar knocker is in a stretching-delaying stage, at the moment, a pipe column is pulled to generate elastic deformation, a mandrel (4) and a piston (8) of the nitrogen accelerator also move from bottom to top relative to the lower cylinder barrel (6) under the action of tension, so that the nitrogen in the lower cylinder barrel (6) is compressed to store energy, when the upper jar knocker goes through a delaying stroke, and the piston (8) enters a jar cavity, a mandrel system of the upper jar knocker enters a free stroke state, the energy accumulated by the nitrogen accelerator and the elastic potential energy of the pipe column are suddenly released to drive a knocking head on the mandrel of the upper jar knocker to impact upwards instantly, and generate stronger knocking force on a stuck point, meanwhile, the vibration of the shocked pipe column during rebounding can be reduced, the underground pipe column and the cement sheath are protected, and the well repairing quality is improved.
10. A method of accelerating a nitrogen accelerator as defined in claim 9, wherein: the initial pressure of nitrogen in the nitrogen chamber (21) is 15MPa, the compression ratio is 1.3, and the maximum working pressure is 19.5 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111643126.7A CN114293941A (en) | 2021-12-29 | 2021-12-29 | Nitrogen accelerator and acceleration method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111643126.7A CN114293941A (en) | 2021-12-29 | 2021-12-29 | Nitrogen accelerator and acceleration method thereof |
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| CN202111643126.7A Pending CN114293941A (en) | 2021-12-29 | 2021-12-29 | Nitrogen accelerator and acceleration method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5918688A (en) * | 1997-10-09 | 1999-07-06 | Dailey International, Inc. | Gas-filled accelerator |
| CN2851537Y (en) * | 2005-06-15 | 2006-12-27 | 北京安东奥尔工程技术有限责任公司 | Hydraulic and mechanical type bumper jar while drilling |
| CN102434116A (en) * | 2012-01-17 | 2012-05-02 | 江苏省无锡探矿机械总厂有限公司 | Nitrogen spring type hydraulic chuck |
| CN104499978A (en) * | 2014-12-18 | 2015-04-08 | 贵州高峰石油机械股份有限公司 | Bidirectional disc-spring jar accelerator and accelerating method thereof |
| CN108204220A (en) * | 2017-12-25 | 2018-06-26 | 中海油能源发展股份有限公司 | A kind of deep water formation isolation valves completion tool |
-
2021
- 2021-12-29 CN CN202111643126.7A patent/CN114293941A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5918688A (en) * | 1997-10-09 | 1999-07-06 | Dailey International, Inc. | Gas-filled accelerator |
| CN2851537Y (en) * | 2005-06-15 | 2006-12-27 | 北京安东奥尔工程技术有限责任公司 | Hydraulic and mechanical type bumper jar while drilling |
| CN102434116A (en) * | 2012-01-17 | 2012-05-02 | 江苏省无锡探矿机械总厂有限公司 | Nitrogen spring type hydraulic chuck |
| CN104499978A (en) * | 2014-12-18 | 2015-04-08 | 贵州高峰石油机械股份有限公司 | Bidirectional disc-spring jar accelerator and accelerating method thereof |
| CN108204220A (en) * | 2017-12-25 | 2018-06-26 | 中海油能源发展股份有限公司 | A kind of deep water formation isolation valves completion tool |
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