CN102678064A - Control method for improving anti-sticking performance and connection strength of round thread oil pipe and bushing - Google Patents
Control method for improving anti-sticking performance and connection strength of round thread oil pipe and bushing Download PDFInfo
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- CN102678064A CN102678064A CN2011103534488A CN201110353448A CN102678064A CN 102678064 A CN102678064 A CN 102678064A CN 2011103534488 A CN2011103534488 A CN 2011103534488A CN 201110353448 A CN201110353448 A CN 201110353448A CN 102678064 A CN102678064 A CN 102678064A
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Abstract
The invention discloses a control method for improving the anti-sticking performance and connection strength of a round thread oil pipe and a bushing, which belongs to the technical field of improvement on the performance of API (American Petroleum Institute) round thread oil pipe and bushing entities in the petroleum and natural gas industry. The method comprises the following steps of: comprehensively controlling the yield strength of the oil pipe, the bushing and a coupling material; controlling the parameters of inner and outer threads; and controlling the coupling surface treating quality, wherein the inner and outer threads are specifically a coupling inner thread and a bushing outer thread. By comprehensively controlling the yield strength, the inner and outer thread parameters and the like of the oil pipe, the bushing and the coupling material, the anti-sticking performance of an API round thread is improved, the connection strength is improved greatly, the underground sealing reliability and strength reliability of the API round thread oil pipe and a bushing joint are enhanced, and safety in use of the API round thread oil pipe and the bushing is ensured.
Description
Technical field
The present invention relates to improve in the oil and natural gas industry technical field of API round thread oil pipe and sleeve pipe object performance, particularly improve the anti-stick integrated control method of buckleing performance and bonding strength of API round thread oil pipe and sleeve pipe simultaneously.
Background technology
Oil pipe and sleeve pipe are the equipment that ten minutes is important and use amount is big in oil and gas prospect, the exploitation, in the exploitation total cost, on average account for about 25%.Oil pipe and sleeve pipe connect into tubing string through the screw thread that has certain taper by root, form gas channel in the lower going-into-well.API (American Petroleum Institute; American Petroleum Institute) round thread of standard code is called for short the API round thread; Owing to have simple, easy to maintenance, good seal performance of processing and advantages of cheap price, it is widely-used to be used as oil pipe and casing joint screw thread.
For guaranteeing good interchangeability, API round thread dimensional parameters tolerance is bigger.Because joint two ends, button back contact pressure is higher on the API round thread, the thread gluing phenomenon takes place in screw thread easily, and thread gluing causes flank to damage easily, thereby causes nipple poorly sealed, even bonding strength does not reach standard-required; Because API round thread dimensional parameters tolerance is bigger; The upper limit external screw thread and the lower limit internal thread that are in the standard of tolerance scope are gone up when detaining cooperation; The thread gluing phenomenon can appear in joint two ends screw thread; And the lower limit external screw thread and the upper limit internal thread that are in the standard of tolerance scope are gone up when detaining cooperation, and the phenomenon of male connection from the female adapter slippage then takes place easily.If the down-hole nipple takes place to leak or thread off; To cause economic loss even serious accident; This is restricted the use of API round thread; Particularly, require API round thread oil pipe and sleeve pipe to have the good anti-stick performance of buckleing and have high bonding strength simultaneously in recent years along with being on the increase of deep-well and horizontal well.
Therefore, in practical application, anti-stick performance and the bonding strength buckled that need take measures to improve API round thread oil pipe and sleeve pipe is to satisfy the needs of practical application.Method at present commonly used is according to actual needs, through a certain parameter is carried out qualitative adjustment, like thread material etc., improves the anti-stick button performance or the bonding strength of nipple.
In realizing process of the present invention; The inventor finds that there is following problem at least in prior art: the anti-stick control method of buckleing performance and bonding strength of existing raising API round thread oil pipe and sleeve pipe; Often occur paying attention to improving the bonding strength that anti-stick button results of property has reduced joint during practical application, or in the bonding strength that improves joint, slackened the anti-stick button performance of joint.The patent No. is that 99240437.1 Chinese utility model patent discloses the anti-stick button performance that a kind of method that increases tooth form angle, screw thread top improves screw thread; But increase the form of thread angle and can cause the thread attenuate; And the thread gaps after the top screw-threaded engagement strengthens, and the anti-stick button performance of screw thread improves but the bonding strength and the sealing performance of screw thread receive very big influence.
Summary of the invention
The purpose of the embodiment of the invention is the defective to above-mentioned prior art; A kind of round thread oil pipe and anti-stick control method of buckleing performance and bonding strength of sleeve pipe of improving is provided; Through to oil pipe, sleeve pipe and Comprehensive Control such as box cupling material yield intensity and internal and external threads parameter; Both improved the anti-stick performance of buckleing of API round thread oil pipe and sleeve pipe, the intensity that is threaded simultaneously is greatly improved.
The technical scheme taked of the present invention is to achieve these goals:
Improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe, said control method comprises control tubing and casing and box cupling YIELD STRENGTH and control internal and external screw thread parameter, wherein:
Said control tubing and casing and box cupling YIELD STRENGTH are specially: control the minimum high 8-12% of said tubing and casing YIELD STRENGTH minimum than the API Spec 5CT of American Petroleum Institute standard code, control said box cupling YIELD STRENGTH minimum than the high 1-3% of said tubing and casing YIELD STRENGTH minimum;
Said internal and external screw thread is specially box cupling internal thread and tubing and casing external screw thread, and said control internal and external screw thread parameter is specially:
Control the tapering of said internal and external screw thread: diameter increment is 60-65mm/m on every meter length of said internal and external screw thread,
Control the screw-pitch deviation of said internal and external screw thread: the said screw-pitch deviation on the said internal and external screw thread per inch length is-0.05-+0.05mm,
Control the thread height deviation of said internal and external screw thread: the said thread height deviation of said internal and external screw thread is-0.025-+0.05mm.
Further, said control method also comprises the physical dimension of controlling said sleeve pipe.
Further, said control method also comprises the said box cupling interior threaded surface processing of control quality.
Further, said control method also comprises the black top screw thread of controlling said tubing and casing.
Particularly, the physical dimension of said control tubing and casing is specially:
The outside diameter tolerance of controlling said tubing and casing is the 0-+1% of the nominal diameter of said tubing and casing;
The wall thickness minimum value of controlling said tubing and casing is more than or equal to 92.5% of the nominal wall thickness of said tubing and casing;
The external diameter ovality of controlling said tubing and casing is smaller or equal to 1%;
The eccentricity of controlling said tubing and casing is smaller or equal to 13%.
Particularly, the said box cupling interior threaded surface processing of said control quality is specially:
It is smooth, even, fine and close to control said box cupling interior threaded surface phosphate coating, no obscission, and said phosphate coating is connected closely with said box cupling internal thread matrix, and the thickness of controlling said phosphate coating is 0.018-0.028mm.
Particularly, the black top screw thread of the said tubing and casing of said control is specially: it is consistent along circumference to control said black top screw initial thread button, and screw thread each starting buckle position, orientation in said black top differs in 2 buttons.The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: through to Comprehensive Control such as tubing and casing and box cupling material yield intensity and internal and external threads parameters; Both improved the anti-stick button performance of API round thread tubing and casing; Its bonding strength also is greatly improved simultaneously; Thereby strengthened sealing reliability and the strength reliability of API round thread oil sleeve joint, guaranteed the safe handling of API round thread tubing and casing in the down-hole.Adopt the method that the used round thread tubing and casing in oil field is carried out quality examination and control, the sleeve pipe accident descends obviously, is example to reduce by 20 mouthfuls of well generation sleeve pipe quality problems every year, and annual evitable direct economic loss is just above at least 3,000 ten thousand yuan.The popularization of this method will bring remarkable economic efficiency and social benefit to the oil field.
Description of drawings
Fig. 1 is the joint sketch map after two oil/sleeve pipes providing in the embodiment of the invention and a box cupling are threaded.
Wherein:
1, oil/sleeve pipe, 2, box cupling.
The specific embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Embodiment 1
The embodiment of the invention provides a kind of anti-stick integrated control method of buckleing performance and bonding strength of API round thread oil/sleeve pipe that improves simultaneously; Referring to Fig. 1; Said control method comprises control oil/sleeve pipe 1 and box cupling 2 YIELD STRENGTH and control internal and external screw thread parameter, and said internal and external screw thread is specially box cupling 2 internal threads and oil/sleeve pipe 1 external screw thread.The embodiment of the invention is the control method to API round thread tubing and casing, and other parameters of not mentioning are all controlled according to the API standard-required.
Slippage is that yield deformation has taken place the internal and external screw thread connecting portion in essence, is that inefficacy has taken place material after all, so YIELD STRENGTH is one of most important factor that influences API round thread sleeve pipe bonding strength.Increase oil/sleeve pipe and box cupling YIELD STRENGTH, can obviously increase the ability of nipple resistance to deformation, thereby increase the bonding strength of nipple.
The relation of thread parameter and thread gluing is bigger, and for example the too conference of fluctuating of the tapering of screw thread and pitch causes the axial interference of internal and external threads to increase, and then causes thread gluing easily.Therefore through the control thread parameter, can effectively prevent the generation of thread gluing phenomenon.
In sum; The embodiment of the invention is through carrying out Comprehensive Control to oil/sleeve pipe and box cupling material yield intensity and internal and external threads parameter; Can improve the anti-stick performance of buckleing of API round thread oil/sleeve pipe; Can improve its bonding strength again, thereby strengthen sealing reliability and the strength reliability of API round thread joint, guarantee the safe handling of API round thread oil/sleeve pipe in the down-hole.
Said control method also comprises the physical dimension of control oil/sleeve pipe 1.
Slippage takes place and lost efficacy in API round thread oil/sleeve pipe easily; The intensity of slippage load and body male thread portion is closely related; Thereby the physical dimension of control oil/sleeve pipe can be improved the intensity of body male thread portion; Thereby effectively controlled API round thread oil/sleeve pipe slippage failure phenomenon, further improved the bonding strength of API round thread oil/sleeve pipe.
Said control method also comprises control box cupling 2 interior threaded surface processing quality.
The screw thread thread gluing changes the intersolubility between the friction pair owing to internal and external screw thread surface adhesive wear causes that the double thread surface is handled, and improves lubrication, thereby has improved the wear resistance of screw thread, has further improved anti-stick button performance.
Said control method also comprises the black top screw thread of control oil/sleeve pipe 1.
Can make the stress distribution of position, threaded portion on 360 ° of circumference even through controlling black top screw thread, thereby further improve the bonding strength of API round thread oil/sleeve pipe.
Embodiment 2
Buckle performance and bonding strength balancedly improves in order to guarantee that API round thread oil/sleeve pipe is anti-stick, present embodiment has carried out quantitative control to each parameter on the basis of embodiment 1.
Controlling oil/sleeve pipe 1 described in the embodiment of the invention is specially with box cupling 2 YIELD STRENGTH:
Control oil/sleeve pipe 1 YIELD STRENGTH minimum is than the high 8-12% of minimum of API Spec 5CT standard code, and control box cupling 2 YIELD STRENGTH minimums are than the high 1-3% of oil/sleeve pipe 1 YIELD STRENGTH minimum.
The internal and external screw thread of control described in embodiment of the invention parameter is specially:
Control the tapering of said internal and external screw thread: diameter increment is 60-65mm/m on every meter length of said internal and external screw thread;
Control the screw-pitch deviation of said internal and external screw thread: the said screw-pitch deviation on the said internal and external screw thread per inch length is-0.05-+0.05mm;
The relation of tapering and pitch and thread gluing is bigger in the thread parameter; The too conference of fluctuating of tapering and pitch causes the axial interference of internal and external threads to increase; And then cause thread gluing easily; Through the tapering of control screw thread and the generation that pitch helps preventing the thread gluing phenomenon, improved the anti-stick performance of buckleing of API round thread oil/sleeve pipe.
Control the thread height deviation of said internal and external screw thread: the said thread height deviation of said internal and external screw thread is-0.025-+0.05mm.
Thread height is a key factor that influences the intensity that is threaded, and the thread height Deviation Control in the overgauge scope, has been increased the area of screw thread bearing surface on the one hand; Improved the frictional force of bearing surface; Reduce the possibility of slippage, improved the bonding strength of screw thread, on the other hand; The also corresponding increase of the radial-deformation that need overcome when the thread height increase makes the screw thread slippage, the bonding strength of screw thread also is improved.
The physical dimension of said control oil/sleeve pipe 1 is specially:
The external diameter of control oil/sleeve pipe 1: the outside diameter tolerance of oil/sleeve pipe 1 is 0-+1%D, and D is the nominal diameter of oil/sleeve pipe 1;
The wall thickness of control oil/sleeve pipe 1: the wall thickness minimum value >=92.5%t of oil/sleeve pipe 1, t are the nominal wall thickness of oil/sleeve pipe 1;
Slippage takes place and lost efficacy in round thread oil/sleeve pipe easily; Near the intensity of slippage load and body male thread portion (especially last button of thread engagement) is closely related; Increase body external diameter and wall thickness and also just increased the wall thickness of male thread portion, thereby improved the bonding strength of round thread oil/sleeve pipe.
The external diameter ovality of control oil/sleeve pipe 1: external diameter ovality≤1% of oil/sleeve pipe 1;
The external diameter ovality is too big, and the internal and external threads contact after can causing detaining is inhomogeneous, thereby causes the screw thread unbalance stress, has reduced the supporting capacity of nipple, and the external diameter ovality of rationally controlling oil/sleeve pipe can improve the supporting capacity of nipple.
The eccentricity of control oil/sleeve pipe 1: the eccentricity of oil/sleeve pipe 1≤13%.
Wherein: eccentricity
t
MaxAnd t
MinBe respectively maximum value and the minimum value in a plurality of wall thickness value of measuring on oil/sleeve pipe 1 a certain cross section.
Wall thickness can make oil/sleeve pipe better centering in process uniformly, and the screw thread of processing is more even, if eccentricity is bigger; The orientation wall thickness that thread bottom, then same cross section has is big, and the orientation wall thickness that has is little, and the local stress of wall thickness minimum is big; Can preferentially lose efficacy; Reduced the bonding strength of nipple, present embodiment can effectively improve the bonding strength of nipple through the control eccentricity.
The box cupling of control described in the embodiment of the invention 2 interior threaded surface are handled quality and are specially:
Smooth, even, fine and close during the range estimation of control box cupling 2 interior threaded surface phosphate coatings, no obscission adopts the said phosphate coating of metallographic observation to be connected closely with box cupling 2 internal thread matrixes, and the thickness of controlling said phosphate coating is 0.018-0.028mm.
The screw thread thread gluing changes the intersolubility between the friction pair owing to internal and external screw thread surface adhesive wear causes that the double thread surface is handled, and improves lubrication, thereby has improved the wear resistance of screw thread.When the alramenting layer thickness is very thin; The phosphate coating adhesive capacity is poor, and contact of internal and external screw thread matrix and generation thread gluing easily increase phosphate coating thickness under higher torsional interaction; Then the adhesive power of phosphate coating on matrix strengthens; The internal and external screw thread matrix is difficult for contact, and anti-mistake is turned round ability and strengthened, and can obviously improve the anti-stick button performance of round thread.But the change of too thick phosphate coating thickness double thread parameter is bigger; Can influence the mesh degree of screw thread; Reduce the bonding strength of nipple; The embodiment of the invention has been chosen rational phosphate coating thickness on the basis of test of many times, not only realized the purpose of the anti-stick button performance of nipple but also do not influenced the bonding strength of nipple.
The black top screw thread of the said oil/sleeve pipe of control described in the embodiment of the invention is specially: control said black top screw initial thread and buckle along the circumference unanimity, screw thread each starting buckle position, orientation in said black top differs in 2 buttons.
Under the ideal situation; The position (button number) that black top external screw thread begins to occur along the circumferential direction differs a button at most, but owing to tube wall thickness ununiformity, external diameter circle, pipe is eccentric or add and there is not bigger difference the position that medium reason causes black top screw thread to begin to occur easily man-hour.
Black top external screw thread starting buckle is big more with the different differences in orientation; Explain that external screw thread is inhomogeneous more along circumference; And then can cause the stress distribution of screw thread position on 360 ° of circumference inhomogeneous; Reduced the whole bonding strength of nipple, thereby the starting buckle position in black each orientation of screw thread, top of control differs in 2 buttons, can strengthen the whole bonding strength of nipple.
The API round thread oil/sleeve pipe of the control method manufacturing that provides by the embodiment of the invention has the good anti-stick performance of buckleing; Even nipple on the thread parameter limit tolerance cooperates down the use peak torque/shackle do not see thread gluing 3 times yet, the bonding strength of nipple exceeds more than 30% of API standard-required value in addition.The API round thread oil/sleeve pipe steady quality that meets this integrated control method is reliable, anti-stick button function admirable, and the joint bonding strength is high, has guaranteed economy and security reliability that API round thread oil/sleeve pipe uses in the down-hole.
Embodiment 3
Control to API Φ 139.7 * 7.72mm N80 round thread sleeve pipe 1 and box cupling 2 is undertaken by the following aspects:
(1) control sleeve pipe 1 and box cupling 2 material yield intensity:
Shell material yield strength minimum exceeds 10% control on the minimum basis of API Spec 5CT standard code, promptly sleeve pipe 1 material yield strength control is in the 607-758MPa scope; Box cupling 2 material yield intensity minimums exceed 12% control on the minimum basis of API Spec 5CT standard code, promptly box cupling material yield strength control is in the 618-758MPa scope.
(2) control sleeve pipe 1 physical dimension:
1. external diameter: outside diameter tolerance is controlled in the 0-+1%D scope, and promptly the sleeve pipe outside diameter control is in φ 139.7-141.10mm scope.
2. wall thickness: the wall thickness minimum value by >=92.5%t control, i.e. wall thickness minimum value requirement >=7.14mm.
3. external diameter ovality: the external diameter ovality is controlled at≤and 1%.
4. eccentricity: eccentricity is controlled at≤and 13%.
(3) internal and external screw thread parameter control:
1. tapering: diameter increment is controlled in the 60-65mm/m scope on sleeve pipe external screw thread and every meter length of box cupling internal thread.
2. screw-pitch deviation: the screw-pitch deviation on the internal and external screw thread per inch length is controlled at-the 0.05-+0.05mm scope in.
3. thread height deviation: internal and external screw thread thread height Deviation Control is in-0.025-+0.05mm scope.
(4) box cupling 2 interior threaded surface are handled quality control:
Box cupling 2 interior threaded surface phosphate coatings are smooth, even, fine and close, and no obscission adopts the metallographic observation phosphate coating to be connected with matrix closely, and the phosphate coating THICKNESS CONTROL is in the 0.018-0.028mm scope.
(5) sleeve pipe 1 black top screw thread control:
Sleeve pipe 1 black top screw initial thread button is consistent along circumference, and black top each orientation starting buckle Position Control of screw thread is in differing 2 buttons.
(6) other is controlled by the API standard-required.
Sleeve pipe and box cupling sample that the control method that provides by the embodiment of the invention is produced carry out actual loading test, on the use peak torque/shackle do not see thread gluing 3 times, the bonding strength of nipple reaches 2053kN, is higher than other API round thread joints far away.Simultaneously, 1000 tons of specifications that meet the control method that the embodiment of the invention provides are that oval threaded sleeve 1 and the box cupling 2 of Φ 139.7 * 7.72mm N80 uses surpassing the dark down-hole of 3000m, reach re-set target, and are respond well.Adopt the method that the used round thread tubing and casing in oil field is carried out quality examination and control, the sleeve pipe accident descends obviously, is example to reduce by 20 mouthfuls of well generation sleeve pipe quality problems every year, and annual evitable direct economic loss is just above at least 3,000 ten thousand yuan.The popularization of this method will bring remarkable economic efficiency and social benefit to the oil field.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe, it is characterized in that, said control method comprises control tubing and casing and box cupling YIELD STRENGTH and control internal and external screw thread parameter, wherein:
Said control tubing and casing and box cupling YIELD STRENGTH are specially: control the minimum high 8-12% of said tubing and casing YIELD STRENGTH minimum than the API Spec 5CT of American Petroleum Institute standard code, control said box cupling YIELD STRENGTH minimum than the high 1-3% of said tubing and casing YIELD STRENGTH minimum;
Said internal and external screw thread is specially box cupling internal thread and tubing and casing external screw thread, and said control internal and external screw thread parameter is specially:
Control the tapering of said internal and external screw thread: diameter increment is 60-65mm/m on every meter length of said internal and external screw thread,
Control the screw-pitch deviation of said internal and external screw thread: the said screw-pitch deviation on the said internal and external screw thread per inch length is-0.05-+0.05mm,
Control the thread height deviation of said internal and external screw thread: the said thread height deviation of said internal and external screw thread is-0.025-+0.05mm.
2. the anti-stick control method of buckleing performance and bonding strength of raising round thread oil pipe according to claim 1 and sleeve pipe is characterized in that said control method also comprises the physical dimension of controlling said sleeve pipe.
3. the anti-stick control method of buckleing performance and bonding strength of raising round thread oil pipe according to claim 1 and 2 and sleeve pipe is characterized in that, said control method also comprises the said box cupling interior threaded surface processing of control quality.
4. the anti-stick control method of buckleing performance and bonding strength of raising round thread oil pipe according to claim 1 and 2 and sleeve pipe is characterized in that, said control method also comprises the black top screw thread of controlling said tubing and casing.
5. the anti-stick control method of buckleing performance and bonding strength of raising round thread oil pipe according to claim 2 and sleeve pipe is characterized in that the physical dimension of said control tubing and casing is specially:
The outside diameter tolerance of controlling said tubing and casing is the 0-+1% of the nominal diameter of said tubing and casing;
The wall thickness minimum value of controlling said tubing and casing is more than or equal to 92.5% of the nominal wall thickness of said tubing and casing;
The external diameter ovality of controlling said tubing and casing is smaller or equal to 1%;
The eccentricity of controlling said tubing and casing is smaller or equal to 13%.
6. the anti-stick control method of buckleing performance and bonding strength of raising round thread oil pipe according to claim 3 and sleeve pipe is characterized in that, the said box cupling interior threaded surface of said control is handled quality and is specially:
It is smooth, even, fine and close to control said box cupling interior threaded surface phosphate coating, no obscission, and said phosphate coating is connected closely with said box cupling internal thread matrix, and the thickness of controlling said phosphate coating is 0.018-0.028mm.
7. the anti-stick control method of buckleing performance and bonding strength of raising round thread oil pipe according to claim 4 and sleeve pipe; It is characterized in that; The black top screw thread of the said tubing and casing of said control is specially: it is consistent along circumference to control said black top screw initial thread button, and screw thread each starting buckle position, orientation in said black top differs in 2 buttons.
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| CN201110353448.8A CN102678064B (en) | 2011-11-09 | 2011-11-09 | Improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe |
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| CN201110353448.8A CN102678064B (en) | 2011-11-09 | 2011-11-09 | Improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe |
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| TWI636198B (en) * | 2016-12-29 | 2018-09-21 | 詮豐精密工具股份有限公司 | Threaded-engaging structure |
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| CN114427626A (en) * | 2022-01-11 | 2022-05-03 | 江苏集萃碳纤维及复合材料应用技术研究院有限公司 | Connecting structure of composite material oil pipe |
| CN114635670A (en) * | 2022-02-25 | 2022-06-17 | 中国矿业大学 | Method for preventing fracture of geological casing for underground existing hydrographic drilling |
| CN114753779A (en) * | 2014-06-05 | 2022-07-15 | 美题隆公司 | Coupling for rod |
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| CN111927373A (en) * | 2020-08-10 | 2020-11-13 | 中国石油天然气集团有限公司 | Threaded wellhead sealing detection pressure test load determination method, storage medium and equipment |
| CN111927373B (en) * | 2020-08-10 | 2022-07-05 | 中国石油天然气集团有限公司 | Threaded wellhead sealing detection pressure test load determination method, storage medium and equipment |
| CN114427626A (en) * | 2022-01-11 | 2022-05-03 | 江苏集萃碳纤维及复合材料应用技术研究院有限公司 | Connecting structure of composite material oil pipe |
| CN114635670A (en) * | 2022-02-25 | 2022-06-17 | 中国矿业大学 | Method for preventing fracture of geological casing for underground existing hydrographic drilling |
| CN114635670B (en) * | 2022-02-25 | 2023-02-10 | 中国矿业大学 | Method for preventing fracture of geological casing for underground existing hydrographic drilling |
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