CN108756772B - Flexible reversing liquid-gas type drill string bidirectional shock absorber - Google Patents
Flexible reversing liquid-gas type drill string bidirectional shock absorber Download PDFInfo
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- CN108756772B CN108756772B CN201810851910.9A CN201810851910A CN108756772B CN 108756772 B CN108756772 B CN 108756772B CN 201810851910 A CN201810851910 A CN 201810851910A CN 108756772 B CN108756772 B CN 108756772B
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- joint
- shock absorber
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 23
- 230000035939 shock Effects 0.000 title claims abstract description 23
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 230000007246 mechanism Effects 0.000 claims abstract description 26
- 238000013016 damping Methods 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 230000009467 reduction Effects 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 66
- 239000007789 gas Substances 0.000 claims description 23
- 210000001503 joint Anatomy 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 229920002545 silicone oil Polymers 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a flexible reversing liquid-gas type drill string bidirectional shock absorber which mainly comprises an upper connector (1), a rope flexible reversing mechanism, a liquid-gas linkage shock absorbing mechanism and a lower connector (16), wherein a middle mandrel (4) is connected with a middle connector (8) through a steel wire rope (6), the upper ends of a liquid cylinder inner cylinder (11) and a liquid cylinder outer cylinder (9) are respectively connected with the middle mandrel (4) and the middle connector (8) through threads, and the liquid cylinder inner cylinder (11) and a connector connecting piece (15) can slide and rotate relatively. Axial vibration generated in the lower drill string is absorbed by the hydraulic cylinder vibration reduction mechanism during operation; the circumferential torsional vibration is converted into axial vibration through the rope reversing mechanism and then absorbed by the vibration damping mechanism, so that circumferential vibration damping is realized. The invention adopts the rope flexible reversing mechanism and the liquid-gas linkage vibration damping mechanism, has bidirectional vibration damping and double vibration damping functions, improves the overall reliability and service life, and has the advantages of good flexibility, small impact, high stability and strong repairability.
Description
Technical Field
The invention relates to the technical fields of petroleum drilling, geological exploration and the like, in particular to a flexible reversing liquid-gas type drill string bidirectional shock absorber.
Background
In recent years, with the further development and utilization of petroleum and natural gas in China, higher requirements are put on how to prolong the service life of drilling tools and reduce drilling accidents. In the drilling process, the axial vibration of the drill string can be caused by the intermittent motion between the well bottom unevenness and the teeth of the drill bit, meanwhile, the friction is generated between the drill string at the lower part and the well wall, the drill string can generate stick-slip vibration, alternating stress can be generated in the drill string by the vibration of the two drill strings, when the generated excitation frequency is the same as or multiple times of the natural frequency of a drill string system, the drill string can be caused to resonate, the drill string is damaged, and finally, the drill is broken, so that drilling accidents are caused.
At present, the following problems exist in the conventional drill string bidirectional shock absorber in the drilling process: the reversing mechanism usually adopts a thread reversing mode, and is easy to fail and has poor overall reliability; the hydraulic vibration reduction mode has a complex structure and short compression stroke, so that the axial vibration reduction effect is poor; the mechanical vibration reduction mode has short overall service life, low repeated use rate and high repair cost. Therefore, the novel drill string bidirectional shock absorber with better bidirectional shock absorbing effect and longer service life is necessary to be invented.
Disclosure of Invention
The invention aims to solve the structural defect of the conventional bidirectional vibration damper for the drill string, improve the vibration damping effect and prolong the service life, and particularly provides the bidirectional vibration damper for the flexible reversing liquid-gas drill string.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a flexible reversing liquid-gas type drill string bidirectional shock absorber mainly comprises an upper joint, a rope flexible reversing mechanism, a liquid-gas linkage shock absorber mechanism and a lower joint; the method is characterized in that: the cable flexible reversing mechanism consists of an end face mud blocking ring, an end face O-shaped sealing ring, a middle mandrel, a cable connector, a steel wire cable, a cable outer barrel and a middle connector, wherein the upper end of the middle mandrel is connected with the upper connector through threads, the steel wire cable connects the middle mandrel with the middle connector through the cable connector, and the cable plays roles of transmitting torque and connecting; the cable outer cylinder is connected with the middle joint through threads, an annular groove is formed in the upper end of the middle mandrel, a sealing ring and a mud blocking ring are arranged on the annular groove, and the cable outer cylinder and the middle mandrel can slide and rotate relatively; the liquid-gas linkage vibration absorbing mechanism consists of a liquid cylinder outer cylinder, a cylinder piston, a gas-liquid separation plug, a liquid cylinder piston, a U-shaped outer sealing ring, a U-shaped inner sealing ring, a liquid cylinder inner cylinder, an air tap and a joint connecting piece, wherein the upper end of the liquid cylinder inner cylinder is connected with the lower end of the middle mandrel through threads, and the upper end of the liquid cylinder outer cylinder is connected with the lower end of the middle joint through threads; the cylinder piston is arranged in a cavity between the inner cylinder and the outer cylinder and is tightly attached to the middle joint, the inner ring and the outer ring of the cylinder piston are provided with sealing grooves, one side close to the cylinder is provided with a group of U-shaped outer sealing rings and U-shaped inner sealing rings, and one side close to the middle joint is provided with a group of O-shaped outer sealing rings I, O-shaped inner sealing rings I; the gas-liquid separation plug is positioned in a cavity between the inner cylinder of the liquid cylinder and the outer cylinder of the liquid cylinder and is close to a boss on the inner cylinder of the liquid cylinder, the inner ring and the outer ring of the piston end of the gas-liquid separation plug are provided with sealing grooves, and two pairs of O-shaped inner sealing rings II and O-shaped outer sealing rings II are arranged for separating liquid and gas; the lower end of the outer cylinder of the hydraulic cylinder is connected with a joint connecting piece through threads, a piston of the hydraulic cylinder is arranged in a cavity between the inner cylinder of the hydraulic cylinder and is tightly attached to the joint connecting piece, a sealing groove is arranged on the inner ring and the outer ring of the hydraulic cylinder, a group of U-shaped outer sealing rings and U-shaped inner sealing rings are arranged on one side close to the hydraulic cylinder, two groups of O-shaped outer sealing rings I, O-shaped inner sealing rings I are arranged on one side close to the joint connecting piece, and the inner cylinder of the hydraulic cylinder and the piston of the hydraulic cylinder can slide and rotate relatively; the joint connector is connected with the lower joint through threads.
Further, 12 through holes are uniformly distributed on the boss on the inner cylinder of the liquid cylinder and are used for liquid damping vibration attenuation.
Further, 12 threaded holes are formed in the middle mandrel and the middle connector and are used for connecting the steel wire rope connector.
Furthermore, the oil nozzle is arranged on the outer cylinder of the liquid cylinder and is used for adding hydraulic oil.
Furthermore, the air tap is arranged on the outer cylinder of the liquid air cylinder and consists of an air tap seat, an air tap pipe sleeve, a sealing plug, a return spring, a telescopic rod I, a telescopic rod II, a rear cover and a sealing pipe sleeve, and is used for filling high-pressure gas.
(1) The vibration absorber converts circumferential load fluctuation into relative displacement in the axial direction through the rope reversing mechanism, so that the vibration absorber has a better circumferential vibration absorbing effect and longer service life;
(2) The hydraulic cylinder vibration damping mechanism has the dual vibration damping effects of liquid damping vibration damping and gas elastic vibration damping;
(3) The vibration damper vibration damping mechanism has the advantages that when the vibration damper vibration damping mechanism has flexible gas vibration damping, liquid in the liquid cylinder can play a role in buffering when the gas rebounds to avoid secondary impact, and the vibration damper vibration damping mechanism has the characteristics of good flexibility, small impact and good stability;
(4) The pressure of the gas in the cylinder can be adjusted by inflating and deflating the air tap, so that the air tap can be suitable for vibration reduction under different working conditions, can be reused and reduces the cost;
(5) After the drill bit is used for breaking, the elastic potential of gas rebound is converted into circumferential acceleration and axial impact, so that the effect of accelerating and breaking the obstruction is achieved, and the drilling efficiency is improved.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a sectional view showing the structure of the shock absorber in two states, front and rear;
FIG. 3 is a three-dimensional representation of a shock absorber;
FIG. 4 is a three-dimensional comparison of the damper cable reversing mechanism before and after retraction;
FIG. 5 is a cross-sectional view A-A of FIG. 1;
FIG. 6 is a cross-sectional view B-B of FIG. 1;
FIG. 7 is an enlarged view of a portion of the wire rope lug connection at I in FIG. 1;
FIG. 8 is a schematic view of the air faucet of FIG. 1.
In the figure: 1-upper joint; 2-an end face mud baffle ring; 3-end face O-shaped sealing rings; 4-an intermediate mandrel; 5-rope joint; 6-a steel wire rope; 7-a rope outer cylinder; 8-an intermediate joint; 9-a liquid cylinder outer barrel; 10-cylinder piston; 11-a liquid cylinder inner cylinder; 12-O type outer seal ring II; 13-a hydraulic cylinder piston; 14-O type outer sealing ring I; 15-joint connection; 16-lower joint; 17-O type inner seal ring I; 18-U-shaped inner sealing rings; 19-U-shaped outer sealing rings; 20-oil nozzle; 21-a gas-liquid separation plug; a 22-O type inner sealing ring II; 23-air tap, 2301-air tap seat, 2302-air tap sleeve, 2303-sealing plug, 2304-return spring, 2305-telescopic rod I, 2306-telescopic rod II, 2307-rear cover, 2308-sealing sleeve.
Description of the embodiments
The invention is further described below with reference to the accompanying drawings, the scope of the invention not being limited to the following description: a flexible reversing liquid-gas type drill string bidirectional shock absorber consists of an upper joint 1, a rope flexible reversing mechanism, a liquid-gas linkage shock absorber mechanism and a lower joint 16; the cable flexible reversing mechanism consists of an end face mud blocking ring 2, an end face O-shaped sealing ring 3, a middle mandrel 4, a cable connector 5, a steel cable 6, a cable outer barrel 7 and a middle connector 8, wherein the upper end of the middle mandrel 4 is connected with the upper connector 1 through threads, the steel cable 6 is used for connecting the middle mandrel 4 with the middle connector 8 through the cable connector 5, the cable outer barrel 7 is connected with the middle connector 8 through threads, and a cavity structure with movable cable is formed between the cable outer barrel 7 and the middle mandrel 4; the upper part of the middle mandrel 4 is provided with an annular groove for installing the end face mud baffle ring 2 and the end face O-shaped sealing ring 3, and the rope outer barrel 7 and the middle mandrel 4 slide and rotate relatively; the hydraulic-pneumatic linkage vibration reduction mechanism consists of a hydraulic cylinder outer cylinder 9, a cylinder piston 10, a hydraulic cylinder piston 13, a U-shaped inner sealing ring 18, a U-shaped outer sealing ring 19, a hydraulic cylinder inner cylinder 11, a nipple 20, a gas-liquid separation plug 21, an air tap 23, an O-shaped outer sealing ring I14, an O-shaped inner sealing ring I17 and a joint connecting piece 15, wherein the upper end of the hydraulic cylinder outer cylinder 9 is connected with the lower end of the middle joint 8 through threads, and the upper end of the hydraulic cylinder inner cylinder 11 is connected with the lower end of the middle mandrel 4 through threads; the cylinder piston 10 is arranged in a cavity between the liquid cylinder inner cylinder 11 and the liquid cylinder outer cylinder 9 and is tightly attached to the middle mandrel 4, sealing grooves are formed in the inner and outer sides of the cylinder piston 10, a group of U-shaped outer sealing rings 19 and U-shaped inner sealing rings 18 are arranged on one side close to a cylinder, a group of O-shaped outer sealing rings I14 and O-shaped inner sealing rings I17 are arranged on one side close to a middle joint, a gas-liquid separation plug 21 is also arranged in the cavity between the liquid cylinder inner cylinder 11 and the liquid cylinder outer cylinder 9, the piston end of the gas-liquid separation plug 21 is close to a boss on the liquid cylinder inner cylinder 11, and two pairs of O-shaped inner sealing rings II 22 and O-shaped outer sealing rings II 12 are arranged on the piston end; the lower end of the outer cylinder 9 of the hydraulic cylinder is connected with a joint connecting piece 15 through threads; the hydraulic cylinder piston 13 is arranged in a cavity between the hydraulic cylinder inner cylinder 11 and the hydraulic cylinder outer cylinder 9 and is tightly attached to the joint connecting piece 15, sealing grooves are formed in the inner ring and the outer ring of the hydraulic cylinder piston 13, a group of U-shaped outer sealing rings 19 and U-shaped inner sealing rings 18 are arranged on one side close to the hydraulic cylinder, two groups of O-shaped outer sealing rings I14 and O-shaped inner sealing rings I17 are arranged on one side close to the joint connecting piece 15, and the hydraulic cylinder inner cylinder 11 and the hydraulic cylinder piston 13 slide and rotate relatively; the air tap 23 is arranged on the outer cylinder 9 of the hydraulic cylinder, and the air tap 23 consists of an air tap seat 2301, an air tap pipe sleeve 2302, a sealing plug 2303, a return spring 2304, a telescopic rod I2305, a telescopic rod II 2306, a rear cover 2307 and a sealing pipe sleeve 2308; the joint connecting piece 15 is connected with the lower joint 16 through threads; the upper joint 1 and the lower joint 16 are both provided as drill pipe standard joints so that the shock absorber is connected with other drilling tools; 12 threaded holes are formed in the middle mandrel 4 and the middle joint 8; the inner cylinder 11 of the hydraulic cylinder is provided with a boss, and 12 damping small holes are formed in the boss. The hydraulic cylinder is filled with silicone oil, and nitrogen with certain initial pressure is filled in the cylinder; the oil nozzle 20 is mounted on the outer cylinder 9.
Finally, what should be said is: the above embodiments are only for illustrating the technical aspects of the present invention, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (6)
1. A flexible reversing liquid-gas type drill string bidirectional shock absorber mainly comprises an upper joint (1), a rope flexible reversing mechanism, a liquid-gas linkage shock absorber mechanism and a lower joint (16); the flexible reversing mechanism for the cable is characterized by comprising an end face mud blocking ring (2), an end face O-shaped sealing ring (3), a middle mandrel (4), a cable connector (5), a steel cable (6), a cable outer barrel (7) and a middle connector (8), wherein the upper end of the middle mandrel (4) is connected with the upper connector (1) through threads, the steel cable (6) is used for connecting the middle mandrel (4) with the middle connector (8) through the cable connector (5), the cable outer barrel (7) is connected with the middle connector (8) through threads, and a cavity structure with movable cable is formed between the cable outer barrel (7) and the middle mandrel (4); an annular groove is formed in the upper portion of the middle mandrel (4) and used for installing an end face mud baffle ring (2) and an end face O-shaped sealing ring (3), and the rope outer barrel (7) and the middle mandrel (4) slide and rotate relatively; the liquid-gas linkage vibration reduction mechanism consists of a liquid cylinder outer cylinder (9), a cylinder piston (10), a liquid cylinder piston (13), a U-shaped inner sealing ring (18), a U-shaped outer sealing ring (19), a liquid cylinder inner cylinder (11), a nozzle (20), a gas-liquid separation plug (21), an air tap (23), an O-shaped outer sealing ring I (14), an O-shaped inner sealing ring I (17) and a joint connecting piece (15), wherein the upper end of the liquid cylinder outer cylinder (9) is connected with the lower end of a middle joint (8) through threads, and the upper end of the liquid cylinder inner cylinder (11) is connected with the lower end of a middle mandrel (4) through threads; the cylinder piston (10) is arranged in a cavity between the inner cylinder (11) and the outer cylinder (9) and is tightly attached to the middle mandrel (4), a sealing groove is arranged on the inner ring and the outer ring of the cylinder piston (10), a group of U-shaped outer sealing rings (19) and U-shaped inner sealing rings (18) are arranged on one side close to the cylinder, a group of O-shaped outer sealing rings I (14) and O-shaped inner sealing rings I (17) are arranged on one side close to the middle joint, the gas-liquid separation plug (21) is also arranged in the cavity between the inner cylinder (11) and the outer cylinder (9), the piston end of the gas-liquid separation plug (21) is close to a boss on the inner cylinder (11), and two pairs of O-shaped inner sealing rings II (22) and O-shaped outer sealing rings II (12) are arranged on the piston end; the lower end of the liquid cylinder outer cylinder (9) is connected with a joint connecting piece (15) through threads; the hydraulic cylinder piston (13) is arranged in a cavity between the hydraulic cylinder inner cylinder (11) and the hydraulic cylinder outer cylinder (9) and is tightly attached to the joint connecting piece (15), a sealing groove is arranged on the inner ring and the outer ring of the hydraulic cylinder piston (13), a group of U-shaped outer sealing rings (19) and U-shaped inner sealing rings (18) are arranged on one side close to the hydraulic cylinder, two groups of O-shaped outer sealing rings I (14) and O-shaped inner sealing rings I (17) are arranged on one side close to the joint connecting piece (15), and the hydraulic cylinder inner cylinder (11) and the hydraulic cylinder piston (13) slide and rotate relatively; the air tap (23) is arranged on the outer cylinder (9) of the hydraulic cylinder, and the air tap (23) consists of an air tap seat (2301), an air tap sleeve (2302), a sealing plug (2303), a return spring (2304), a telescopic rod I (2305), a telescopic rod II (2306), a rear cover (2307) and a sealing sleeve (2308); the joint connecting piece (15) is connected with the lower joint (16) through threads.
2. A flexible reversing liquid-gas type drill string bi-directional shock absorber according to claim 1, wherein: the upper joint (1) and the lower joint (16) are both arranged as drill rod standard joints so that the shock absorber is connected with other drilling tools.
3. A flexible reversing liquid-gas type drill string bi-directional shock absorber according to claim 1, wherein: and 12 threaded holes are formed in the middle mandrel (4) and the middle joint (8).
4. A flexible reversing liquid-gas type drill string bi-directional shock absorber according to claim 1, wherein: the inner cylinder (11) of the hydraulic cylinder is provided with a boss, and the boss is provided with 12 damping small holes.
5. A flexible reversing liquid-gas type drill string bi-directional shock absorber according to claim 1, wherein: the hydraulic cylinder is filled with silicone oil, and nitrogen with certain initial pressure is filled in the cylinder.
6. A flexible reversing liquid-gas type drill string bi-directional shock absorber according to claim 1, wherein: the oil nozzle (20) is arranged on the outer cylinder (9) of the hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810851910.9A CN108756772B (en) | 2018-07-30 | 2018-07-30 | Flexible reversing liquid-gas type drill string bidirectional shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810851910.9A CN108756772B (en) | 2018-07-30 | 2018-07-30 | Flexible reversing liquid-gas type drill string bidirectional shock absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108756772A CN108756772A (en) | 2018-11-06 |
| CN108756772B true CN108756772B (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810851910.9A Active CN108756772B (en) | 2018-07-30 | 2018-07-30 | Flexible reversing liquid-gas type drill string bidirectional shock absorber |
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| CN107218017A (en) * | 2017-07-11 | 2017-09-29 | 中国石油大学(北京) | Perforation double-acting shock absorber |
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2018
- 2018-07-30 CN CN201810851910.9A patent/CN108756772B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4257245A (en) * | 1979-09-13 | 1981-03-24 | Well Control, Inc. | Compression shock absorber device |
| US6109355A (en) * | 1998-07-23 | 2000-08-29 | Pes Limited | Tool string shock absorber |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108756772A (en) | 2018-11-06 |
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