CN110705012B - Oil sleeve annular pressure control method based on compression capacity of tubular column joint - Google Patents
Oil sleeve annular pressure control method based on compression capacity of tubular column joint Download PDFInfo
- Publication number
- CN110705012B CN110705012B CN201910775446.4A CN201910775446A CN110705012B CN 110705012 B CN110705012 B CN 110705012B CN 201910775446 A CN201910775446 A CN 201910775446A CN 110705012 B CN110705012 B CN 110705012B
- Authority
- CN
- China
- Prior art keywords
- compression
- tcmax
- joint
- tubing string
- pressure control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007906 compression Methods 0.000 title claims abstract description 48
- 230000006835 compression Effects 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 14
- 239000008186 active pharmaceutical agent Substances 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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 an oil sleeve annular pressure control method based on the compression capacity of a tubular column joint, which comprises the following steps: 1) Calculating an annulus pressure control initial value Pos; 2) Calculating the maximum compression load Tcmax born by the tubing string; 3) Determining compression efficiency delta and compression yield strength Tc of the oil pipe airtight threaded joint according to an API RP 5C5 test, selecting a joint anti-compression safety coefficient S at the same time, and transferring to the step 4) when Tcmax/Tc is more than delta/S; when Tcmax/Tc is less than or equal to delta/S, turning to step 5); 4) Calculating a maximum allowable annular pressure value Po; 5) When the calculated equivalent sigma eq of the tubing string is lower than 90% of the yield strength of the tubing material, the annulus pressure is controlled, otherwise, the step 6) is carried out; 6) Changing the compression-resistant safety coefficient S of the joint, turning to step 3), the method can calculate the annular pressure by taking the compression-resistant capacity of the joint into consideration.
Description
Technical Field
The invention belongs to the technical field of oil extraction engineering, and relates to an oil sleeve annular pressure control method based on the compression capacity of a tubular column joint.
Background
In the production operation process of a gas well, an annular pressure calculation method is mainly standardized by API RP 90 marine oil and gas well annular pressure management, so that an annular pressure threshold value is obtained through calculation, but with the complexity of production working conditions of the gas well, such as frequent well switching and fracturing operations of a high-temperature high-pressure deep well, injection and production reciprocating operations of a gas storage well and the like, the load alternating times of a tubing string are increased, the annular pressure well is increased more and more, and particularly, the annular pressure A (oil jacket annular pressure) is abnormally high, so that a great safety risk is brought to production. While annulus pressure control has been performed as prescribed in API RP 90, there is still a growing trend for annulus pressure anomalies. The reason for this is mainly that various airtight threaded joints adopted in high-pressure gas wells have uneven compression resistance (compression efficiency), the compression efficiency is from 30% to 100%, the annular pressure changes (increases/decreases) simultaneously cause the axial load of the pipe string to change, and if the compression load increases, the pipe string is very easy to leak. The full-size physical test in the room also reflects that the pipe column has good sealing performance under tensile load, but is easy to leak when being stretched after being subjected to compressive load.
The current calculation of the annular pressure A is mainly determined by the minimum anti-extrusion strength of an oil pipe or the minimum anti-internal pressure strength of a production casing, and the influence of axial compression load on the sealing performance of a pipe column joint is not considered. Under the reciprocating working condition of a complex gas well, the alternating of the pulling and pressing load has a great influence on the sealing capacity of the tubular column, particularly the compression load, and the annular pressure change easily causes the increase of the compression load of the tubular column. The annulus pressure control must be performed taking into account the compression resistance of the tubular string joint.
The main problems existing in the prior art are as follows: the API RP 90 standard is used as a main calculation annulus pressure, the anti-external-extrusion and anti-internal-pressure bearing capacity of the tubular column is mainly considered, and the compression resistance of the joint is not considered.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an oil jacket annular pressure control method based on the compression capacity of a tubular column joint, which can calculate annular pressure by considering the compression capacity of the joint.
In order to achieve the above purpose, the oil casing annulus pressure control method based on the compression capacity of the tubular column joint comprises the following steps:
1) Acquiring the extrusion resistance Pot of the oil pipe, the internal pressure resistance Pic of the production casing and the internal pressure resistance Picc of the casing of the previous layer of technology under the preset specification, and calculating an annular pressure control initial value Pos according to an API RP 90 test;
2) Calculating the maximum compression load Tcmax born by the tubing string under the annulus pressure Pos according to the gas flow Q, the temperature change T, the internal pressure Pi, the outer diameter D and the wall thickness T of the tubing under the working condition of the complex gas well and the theory of tubing string mechanics;
3) Determining compression efficiency delta and compression yield strength Tc of the oil pipe airtight threaded joint according to an API RP 5C5 test, selecting a joint anti-compression safety coefficient S at the same time, and transferring to the step 4) when Tcmax/Tc is more than delta/S; when Tcmax/Tc is less than or equal to delta/S, turning to step 5);
4) Calculating a maximum allowable annulus pressure value Po through a maximum compression load Tcmax borne by the tubing string according to a tubing string mechanics theory;
5) Checking the triaxial stress intensity of the tubing string according to the maximum allowable annulus pressure value Po or an annulus pressure control initial value Pos and the fourth intensity theory, and controlling the annulus pressure when the calculated equivalent sigma eq of the tubing string is lower than 90% of the yield intensity of the tubing material, otherwise, turning to the step 6);
6) Changing the compression-resistant safety coefficient S of the joint, and turning to the step 3).
The annulus pressure control initial value Pos in step 1) is:
Pos＝Min(50％Pic，80％Picc，75％Pot) (1)。
the tubing string is subjected to a maximum compressive load Tcmax of:
Tcmax＝f(D，t，Q，T，Pi，Pos) (2)
the compression safety coefficient S of the joint is 1-1.3.
And inquiring an API RP 5C3 standard to obtain the extrusion resistance strength Pot of the oil pipe, the internal pressure resistance strength Pic of the production casing and the internal pressure resistance strength Picc of the casing of the upper layer of technology under the preset specification.
The invention has the following beneficial effects:
when Tcmax/Tc is larger than delta/S, the maximum allowable annular pressure value Po is calculated by the maximum compression load Tcmax born by the tubing string; and (3) checking the triaxial stress intensity of the tubing string when Tcmax/Tc is less than or equal to delta/S, controlling the annular pressure when the calculated equivalent sigma eq of the tubing string is less than 90% of the yield strength of the tubing material, otherwise, changing the compression-resistant safety coefficient S of the joint to control the annular pressure of the oil jacket.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, the oil casing annulus pressure control method based on the compression capacity of the tubular column joint according to the invention comprises the following steps:
1) Inquiring an API RP 5C3 standard to obtain the oil pipe extrusion resistance strength Pot, the production casing internal pressure resistance strength Pic and the upper technical casing internal pressure resistance strength Picc under the preset specification, and calculating an annular pressure control initial value Pos according to an API RP 90 test;
Pos＝Min(50％Pic，80％Picc，75％Pot) (1)
2) Calculating the maximum compression load Tcmax born by the tubing string under the annulus pressure Pos according to the gas flow Q, the temperature change T, the internal pressure Pi, the outer diameter D and the wall thickness T of the tubing under the working condition of the complex gas well and the theory of tubing string mechanics;
Tcmax＝f(D，t，Q，T，Pi，Pos) (2)
3) Determining compression efficiency delta and compression yield strength Tc of the oil pipe airtight threaded joint according to an API RP 5C5 test, selecting a joint anti-compression safety coefficient S at the same time, and transferring to the step 4) when Tcmax/Tc is more than delta/S; when Tcmax/Tc is less than or equal to delta/S, turning to step 5), wherein under general conditions, the compression-resistant safety coefficient S of the joint has a value of 1-1.3;
4) Calculating a maximum allowable annulus pressure value Po through a maximum compression load Tcmax borne by the tubing string according to a tubing string mechanics theory;
5) Checking the triaxial stress intensity of the tubing string according to the maximum allowable annulus pressure value Po or an annulus pressure control initial value Pos and the fourth intensity theory, and controlling the annulus pressure when the calculated equivalent sigma eq of the tubing string is lower than 90% of the yield intensity of the tubing material, otherwise, turning to the step 6);
6) Changing the compression-resistant safety coefficient S of the joint, and turning to the step 3).
Example 1
From 2017, the annular pressure of the oil jacket of the western gas storage well is calculated by using the method, the compression efficiency of the P110 joint phi 114.3mm multiplied by 7.37mm is considered, the annular pressure of the oil jacket is calculated to be 22.92MPa, and the annular pressure of the oil jacket is calculated to be 43.95MPa at most according to the API RP 90 standard, so that on-site annular pressure control measures are further changed, and the sealing safety of the pipe column is ensured.
The invention is suitable for the oil collar air pressure control in various complex gas wells, and various complex gas wells are being built by great investment in China, and the construction of one well is tens of millions of yuan, even hundreds of millions of yuan. However, the existing gas well is basically produced by annular pressure, so that certain safety risks are brought, natural gas leakage accidents are easy to occur due to long-term annular pressure, and serious accidents occur once the natural gas leaks into urban living areas through stratum. By adopting the invention, the design capability of the well completion pipe column can be further improved, the leakage risk of the pipe column can be reduced to the greatest extent, and thus, accidents are avoided, so that the invention has good economic benefit and wide application prospect.
Claims (1)
1. The oil casing annulus pressure control method based on the compression capacity of the tubular column joint is characterized by comprising the following steps of:
1) Acquiring the extrusion resistance Pot of the oil pipe, the internal pressure resistance Pic of the production casing and the internal pressure resistance Picc of the casing of the previous layer of technology under the preset specification, and calculating an annular pressure control initial value Pos according to an API RP 90 test;
2) Calculating the maximum compression load Tcmax born by the tubing string under the annulus pressure Pos according to the gas flow Q, the temperature change T, the internal pressure Pi, the outer diameter D and the wall thickness T of the tubing under the working condition of the complex gas well and the theory of tubing string mechanics;
3) Determining compression efficiency delta and compression yield strength Tc of the oil pipe airtight threaded joint according to an API RP 5C5 test, selecting a joint anti-compression safety coefficient S at the same time, and transferring to the step 4) when Tcmax/Tc is more than delta/S; when Tcmax/Tc is less than or equal to delta/S, turning to step 5);
4) Calculating a maximum allowable annulus pressure value Po through a maximum compression load Tcmax borne by the tubing string according to a tubing string mechanics theory;
5) Checking the triaxial stress intensity of the tubing string according to the maximum allowable annulus pressure value Po or an annulus pressure control initial value Pos and the fourth intensity theory, and controlling the annulus pressure when the calculated equivalent sigma eq of the tubing string is lower than 90% of the yield intensity of the tubing material, otherwise, turning to the step 6);
6) Changing the compression-resistant safety coefficient S of the joint, and turning to the step 3);
the annulus pressure control initial value Pos in step 1) is:
Pos＝Min(50％Pic，80％Picc，75％Pot) (1)
the tubing string is subjected to a maximum compressive load Tcmax of:
Tcmax＝f(D，t，Q，T，Pi，Pos) (2)
the value of the compression-resistant safety coefficient S of the joint is 1-1.3;
and inquiring an API RP 5C3 standard to obtain the extrusion resistance strength Pot of the oil pipe, the internal pressure resistance strength Pic of the production casing and the internal pressure resistance strength Picc of the casing of the upper layer of technology under the preset specification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910775446.4A CN110705012B (en) | 2019-08-21 | 2019-08-21 | Oil sleeve annular pressure control method based on compression capacity of tubular column joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910775446.4A CN110705012B (en) | 2019-08-21 | 2019-08-21 | Oil sleeve annular pressure control method based on compression capacity of tubular column joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110705012A CN110705012A (en) | 2020-01-17 |
| CN110705012B true CN110705012B (en) | 2023-10-31 |
Family
ID=69193265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910775446.4A Active CN110705012B (en) | 2019-08-21 | 2019-08-21 | Oil sleeve annular pressure control method based on compression capacity of tubular column joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110705012B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287724B (en) * | 2020-04-01 | 2022-02-01 | 中国石油天然气集团有限公司 | Acidification operation safety control method for preventing packer from failing |
Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3964544A (en) * | 1975-06-20 | 1976-06-22 | Halliburton Company | Pressure operated isolation valve for use in a well testing and treating apparatus, and its method of operation |
| US4105075A (en) * | 1977-07-21 | 1978-08-08 | Baker International Corporation | Test valve having automatic bypass for formation pressure |
| US4125165A (en) * | 1977-07-21 | 1978-11-14 | Baker International Corporation | Annulus pressure controlled test valve with locking annulus pressure operated pressure trapping means |
| US5518073A (en) * | 1994-05-05 | 1996-05-21 | Halliburton Company | Mechanical lockout for pressure responsive downhole tool |
| CN1225976A (en) * | 1998-02-10 | 1999-08-18 | 丰田自动车株式会社 | Fluid pump control apparatus and method |
| CN101172317A (en) * | 2007-11-30 | 2008-05-07 | 重庆大学 | Control device and method for friction welding scrap rubber of motorcycle shock absorber oil storage cylinder |
| CN102061152A (en) * | 2009-11-11 | 2011-05-18 | 中国石油天然气股份有限公司 | High-strength controllable gelout chemical temporary plugging liquid rubber stopper |
| CN102539241A (en) * | 2011-11-18 | 2012-07-04 | 国营第六一六厂 | Strength and sealing performance test method for diesel engine high pressure oil pipe |
| CN102733772A (en) * | 2012-07-12 | 2012-10-17 | 刘庆梅 | Christmas tree of tubing head for borehole operation without killing well |
| CN103235605A (en) * | 2013-04-19 | 2013-08-07 | 南京工业大学 | Working condition-simulating numerically controlled rotary table test-bed loading control system and control method |
| CN103344495A (en) * | 2013-07-22 | 2013-10-09 | 长江水利委员会长江科学院 | Test device for servo control of deep rock mass deformation by using rigid bearing plate center hole method, and method for device |
| CN103821464A (en) * | 2013-11-12 | 2014-05-28 | 山东科瑞石油装备有限公司 | Tubing string vertical vehicular full-automatic smart hydraulic workover rig |
| CN104373053A (en) * | 2014-11-28 | 2015-02-25 | 中国石油天然气集团公司 | Underground natural gas storage injection-production pipe column designing method |
| CN104594834A (en) * | 2014-12-01 | 2015-05-06 | 中国石油大学(华东) | Method for monitoring drilling overflow condition of deepwater oil-based drilling fluid |
| CN104632172A (en) * | 2013-11-15 | 2015-05-20 | 中国石油天然气股份有限公司 | Immovable string hydraulic sandblasting fracture annulus pressure control method for gas field horizontal well |
| WO2017121112A1 (en) * | 2016-01-14 | 2017-07-20 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for evaluating performance of multistage hydraulic jet fracturing string |
| CN107191164A (en) * | 2017-05-23 | 2017-09-22 | 中海石油(中国)有限公司 | The analogue experiment installation and method of shock loading suffered by a kind of perforation tubular column |
| CN107269239A (en) * | 2017-08-04 | 2017-10-20 | 西南石油大学 | A kind of devices and methods therefor of stable oil jacket annular pressure |
| CN108915669A (en) * | 2018-08-15 | 2018-11-30 | 南智（重庆）能源技术有限公司 | Gas storage gas injection tube column vibrating fatigue life-span prediction method |
| CN109404741A (en) * | 2018-11-16 | 2019-03-01 | 中国石油天然气股份有限公司 | Gas storage injection-production well annular pressure processing method |
-
2019
- 2019-08-21 CN CN201910775446.4A patent/CN110705012B/en active Active
Patent Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3964544A (en) * | 1975-06-20 | 1976-06-22 | Halliburton Company | Pressure operated isolation valve for use in a well testing and treating apparatus, and its method of operation |
| US4105075A (en) * | 1977-07-21 | 1978-08-08 | Baker International Corporation | Test valve having automatic bypass for formation pressure |
| US4125165A (en) * | 1977-07-21 | 1978-11-14 | Baker International Corporation | Annulus pressure controlled test valve with locking annulus pressure operated pressure trapping means |
| US5518073A (en) * | 1994-05-05 | 1996-05-21 | Halliburton Company | Mechanical lockout for pressure responsive downhole tool |
| CN1225976A (en) * | 1998-02-10 | 1999-08-18 | 丰田自动车株式会社 | Fluid pump control apparatus and method |
| CN101172317A (en) * | 2007-11-30 | 2008-05-07 | 重庆大学 | Control device and method for friction welding scrap rubber of motorcycle shock absorber oil storage cylinder |
| CN102061152A (en) * | 2009-11-11 | 2011-05-18 | 中国石油天然气股份有限公司 | High-strength controllable gelout chemical temporary plugging liquid rubber stopper |
| CN102539241A (en) * | 2011-11-18 | 2012-07-04 | 国营第六一六厂 | Strength and sealing performance test method for diesel engine high pressure oil pipe |
| CN102733772A (en) * | 2012-07-12 | 2012-10-17 | 刘庆梅 | Christmas tree of tubing head for borehole operation without killing well |
| CN103235605A (en) * | 2013-04-19 | 2013-08-07 | 南京工业大学 | Working condition-simulating numerically controlled rotary table test-bed loading control system and control method |
| CN103344495A (en) * | 2013-07-22 | 2013-10-09 | 长江水利委员会长江科学院 | Test device for servo control of deep rock mass deformation by using rigid bearing plate center hole method, and method for device |
| CN103821464A (en) * | 2013-11-12 | 2014-05-28 | 山东科瑞石油装备有限公司 | Tubing string vertical vehicular full-automatic smart hydraulic workover rig |
| CN104632172A (en) * | 2013-11-15 | 2015-05-20 | 中国石油天然气股份有限公司 | Immovable string hydraulic sandblasting fracture annulus pressure control method for gas field horizontal well |
| CN104373053A (en) * | 2014-11-28 | 2015-02-25 | 中国石油天然气集团公司 | Underground natural gas storage injection-production pipe column designing method |
| CN104594834A (en) * | 2014-12-01 | 2015-05-06 | 中国石油大学(华东) | Method for monitoring drilling overflow condition of deepwater oil-based drilling fluid |
| WO2017121112A1 (en) * | 2016-01-14 | 2017-07-20 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for evaluating performance of multistage hydraulic jet fracturing string |
| CN107191164A (en) * | 2017-05-23 | 2017-09-22 | 中海石油(中国)有限公司 | The analogue experiment installation and method of shock loading suffered by a kind of perforation tubular column |
| CN107269239A (en) * | 2017-08-04 | 2017-10-20 | 西南石油大学 | A kind of devices and methods therefor of stable oil jacket annular pressure |
| CN108915669A (en) * | 2018-08-15 | 2018-11-30 | 南智（重庆）能源技术有限公司 | Gas storage gas injection tube column vibrating fatigue life-span prediction method |
| CN109404741A (en) * | 2018-11-16 | 2019-03-01 | 中国石油天然气股份有限公司 | Gas storage injection-production well annular pressure processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110705012A (en) | 2020-01-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhou et al. | Mechanical characteristics of well cement under cyclic loading and its influence on the integrity of shale gas wellbores | |
| CN111307690B (en) | Packing performance testing device and method for annular cement ring of oil-gas well cylinder | |
| CN210105843U (en) | High-temperature high-pressure gas well cement sheath sealing integrity evaluation system | |
| WO2017121112A1 (en) | Method for evaluating performance of multistage hydraulic jet fracturing string | |
| CN203756119U (en) | Sleeve subassembly for simulated cementation test | |
| CN104373053B (en) | Underground natural gas storage injection-production pipe column designing method | |
| CN106894784B (en) | High temperature and pressure packer and heat resisting and pressure resisting packing element | |
| CN106593411B (en) | A kind of cement sheath sealing and the experimental provision and method of sleeve pipe lifting | |
| CN110705012B (en) | Oil sleeve annular pressure control method based on compression capacity of tubular column joint | |
| CN105840184A (en) | Annular space pressure monitoring and control device and method for deep sea seafloor wellhead | |
| CN111878069A (en) | Composite continuous pipe cable oil-water well casing leakage finding system and method | |
| CN109162695B (en) | Deep hole pressurized water test device | |
| CN110569570B (en) | Annular pressure calculation method based on compression efficiency of threaded joint | |
| CN104653129A (en) | Method for washing screw pumping well | |
| CN108561097A (en) | A kind of 3U types multistage all-metal sealing mandrel type hanger | |
| CN201786324U (en) | Stainless steel high-temperature heat preserving and insulating connecting pipe | |
| CN111287724B (en) | Acidification operation safety control method for preventing packer from failing | |
| CN202970610U (en) | Oil and gas well underground casing pipe packer rubber sleeve | |
| CN215860068U (en) | Pressure testing type casing pipe patching device | |
| CN205206782U (en) | Oil jacket pipe threaded connection gas leakproofness detects packer | |
| CN209764342U (en) | Thermal recovery packing element locking test device | |
| CN109372486B (en) | Simulation test system and method for toe end sliding sleeve | |
| CN201671560U (en) | Single hook-shaped end-face metal self-sealing expansion casing thread joint | |
| CN110082215A (en) | A kind of additional pressure type press-fracturing bridge plug seal and pressure bearing experimental rig and test method | |
| CN111502611A (en) | Mechanical gas well adjustable choke and adjusting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |