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
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- 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
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- tubing string
- pressure control
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- 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 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
-
- 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
-
- 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
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- 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 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.
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|---|---|---|---|
| CN201910775446.4A CN110705012B (en) | 2019-08-21 | 2019-08-21 | Oil sleeve annular pressure control method based on compression capacity of tubular column joint |
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| CN201910775446.4A CN110705012B (en) | 2019-08-21 | 2019-08-21 | Oil sleeve annular pressure control method based on compression capacity of tubular column joint |
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| CN110705012B true CN110705012B (en) | 2023-10-31 |
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| 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 |
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