CN112525415A - Pressure detection method for oil tapping pressure in oil casing coupling - Google Patents
Pressure detection method for oil tapping pressure in oil casing coupling Download PDFInfo
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- CN112525415A CN112525415A CN202011204095.0A CN202011204095A CN112525415A CN 112525415 A CN112525415 A CN 112525415A CN 202011204095 A CN202011204095 A CN 202011204095A CN 112525415 A CN112525415 A CN 112525415A
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- 230000008878 coupling Effects 0.000 title claims abstract description 55
- 238000010168 coupling process Methods 0.000 title claims abstract description 55
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 55
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000010079 rubber tapping Methods 0.000 title claims description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 239000003208 petroleum Substances 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 230000002463 transducing effect Effects 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims abstract description 5
- 238000013461 design Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0007—Fluidic connecting means
- G01L19/003—Fluidic connecting means using a detachable interface or adapter between the process medium and the pressure gauge
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/083—Means for indicating or recording, e.g. for remote indication electrical
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a pressure detection method for the oil pressure building of a screw thread in an oil casing coupling, which comprises the following steps: a pressure release hole is punched on the side wall of the tool withdrawal groove area of the petroleum casing coupling; welding a conversion head at a pressure release hole on the outer wall of the petroleum casing pipe, wherein a central through hole is formed in the conversion head and is communicated with the pressure release hole; mounting a pressure sensor to the transducing head and communicating with the central throughbore of the transducing head; mounting a rotation sensor to the screw-on machine, and connecting both the pressure sensor and the rotation sensor to a data processing and display device; and (3) coating the male threads and the female threads of the petroleum casing pipe with screw thread oil and screwing the male threads and the female threads to obtain the pressure change of the screw thread oil in the coupling tool withdrawal groove in the screwing process. The method can monitor the pressure change of the thread oil in the internal tool withdrawal groove of the coupling in real time, and has positive significance for researching the thread oil pressure building in the coupling of the petroleum casing pipe, guiding the coating mode of the thread oil, designing the thread joint structure and even analyzing the sealing failure.
Description
Technical Field
The invention relates to the technical field of pressure detection, in particular to a pressure detection method for detecting the internal screw thread oil pressure building of an oil casing coupling, and particularly relates to a method for detecting the internal screw thread oil pressure building of the oil casing coupling in the oil casing industry.
Background
The coupling is an important part for connecting the petroleum casing, in order to improve the air sealing capability of the coupling, a conical sealing structure and a limiting shoulder are designed inside the coupling, the raised sealing and shoulder structure causes that a machining cutter cannot naturally withdraw when the threads of the coupling are machined, and partial threads are easy to be incomplete by forced withdrawal, mechanical interference is formed between the machining cutter and male threads when the machining cutter is screwed, and the method for solving the problem is to design a tool withdrawal groove structure at the tail part of a female thread, namely, a section of cylindrical surface groove structure with the diameter larger than the thread tooth bottom is pre-machined in front of the sealing structure. The cutter completes forced withdrawal in the cutter withdrawal groove area, and the completeness of the thread processing of the special fastening hoop is ensured.
Before screwing, thread oil which completely covers male threads (pipes) and female threads (couplings) is coated, when screwing, the thread oil between the threads is gradually extruded into the fit clearance of the male threads and the female threads along with the screwing of the male threads into the female threads, the surplus thread oil is extruded into the tool withdrawal groove, and the thread oil is sealed in the annular space of the tool withdrawal groove structure along with the contact of the sealing surface of the male-female end joint. On one hand, the thread grease squeezed into the annular space of the tool withdrawal groove structure is increased by continuously screwing the male and female threaded connectors, and on the other hand, more threads at the male end are screwed into the tool withdrawal grooves, so that the volume ratio of the thread teeth in the space is increased. The interaction of the two further increases the pressure value of the thread oil in the relief groove, and the pressure value reaches a peak value when the shoulders of the male thread and the female thread are butted, so that the thread oil in the oil casing coupling is subjected to the pressure building phenomenon.
The screw thread oil in the oil casing coupling is suppressed, the hoop stress of the coupling is increased, the contact pressure of the sealing surface of the coupling is reduced, and the connection and sealing performance of the joint are weakened.
At present, because there is no clear method for quantitative research on the coupling holding pressure, the research on the phenomenon only remains on the qualitative theory.
Disclosure of Invention
For the special thread, the male and female threads are usually designed to be in clearance fit for the anti-thread-sticking requirement, but the thread clearance is very small (usually, the tooth top and the bottom are less than 0.2mm, and the tooth flank is less than 0.05mm), and because the thread oil has high viscosity and poor fluidity and the liquid has the incompressible characteristic, the thread oil can generate high pressure during the extrusion process, and the interference contact on the joint can be negatively influenced.
In order to solve the problem of quantitative detection of the pressure build-up of the coupling, the invention provides a pressure detection method for the oil build-up of the internal screw thread of the coupling of the petroleum casing, which comprises the following steps:
a pressure release hole is punched on the side wall of the tool withdrawal groove area of the petroleum casing coupling;
welding a conversion head at a pressure release hole on the outer wall of the petroleum casing pipe, wherein a central through hole is formed in the conversion head and is communicated with the pressure release hole;
mounting a pressure sensor to the transducing head and communicating with the central throughbore of the transducing head;
mounting a rotation sensor to the screw-on machine, and connecting both the pressure sensor and the rotation sensor to a data processing and display device;
and (3) coating the male threads and the female threads of the petroleum casing with screw thread oil, and screwing by using a screwing machine to obtain the pressure change of the screw thread oil pressure in the tool withdrawal groove of the coupling in the screwing process.
Further, the pressure release hole is positioned in the center of the cylindrical surface area of the coupling tool withdrawal groove, and the diameter of the hole
Furthermore, when the conversion head is welded at the pressure release hole on the outer wall of the petroleum casing pipe, the outer side of the coupling of the pressure release hole needs to be milled flat and then welded with the conversion head.
Further, the pressure sensor and the conversion head are connected through a column thread, and the pressure sensor and the conversion head are provided with matched conical sealing structures.
Further, the accuracy of the pressure sensor is 10-20 psi.
The invention has the beneficial effects that:
1. the detection method comprises the steps that the suppressed pressure of the thread oil in the coupling tool withdrawal groove is transmitted to a conversion head through a prefabricated pressure release hole, a pressure value is converted into an electric signal through a connected pressure sensor, and a rotation signal output by equipment and a pressure signal of the pressure sensor are simultaneously input into a data processing device in the screwing process of a screwing machine, so that the synchronous display of pressure-turn number (or time) is realized, and the pressure change of the suppressed pressure of the thread oil in the coupling tool withdrawal groove in the screwing process can be visually observed;
2. the device has a simple structure, is visual and reliable, can detect the pressure build-up of the thread oil in the coupling, has guiding significance for the coating amount of the thread oil and has guiding significance for the design of a thread structure and a sealing structure.
Drawings
FIG. 1 is a schematic structural diagram of a method for pressure measurement of internal thread oil building pressure of an oil casing coupling according to an embodiment of the present invention;
FIG. 2 is a schematic view of a connection structure of a pressure sensor and a conversion head when the pressure detection method for the internal thread oil building pressure of an oil casing coupling according to the embodiment of the present invention is used for detection;
FIG. 3 is a schematic diagram showing the variation of pressure-turn number (or time) during the detection by the pressure detection method for the internal thread oil hold-up pressure of the petroleum casing coupling according to the embodiment of the present invention;
Detailed Description
The pressure detection method and the application thereof of the present invention will be described with reference to the accompanying fig. 1-3 and the specific application examples.
The pressure detection method for the oil pressure building of the internal screw thread of the petroleum casing coupling comprises the following steps:
a pressure release hole 6 is punched on the side wall of the tool withdrawal groove area of the petroleum casing coupling;
welding a conversion head 3 at a pressure release hole 6 on the outer wall of the petroleum casing, wherein a central through hole 33 is formed in the conversion head 3 and is communicated with the pressure release hole;
mounting a pressure sensor 4 to the transducing head 3 and communicating with the central through hole of the transducing head 3;
mounting the rotation sensor 7 to the screw-on machine and connecting both the pressure sensor and the rotation sensor to a data processing and display device 8;
and (3) coating the male threads and the female threads of the petroleum casing with screw thread oil, and screwing by using a screwing machine to obtain the pressure change of the screw thread oil pressure in the tool withdrawal groove of the coupling in the screwing process.
It should be noted that the pressure release hole is positioned in the center of the cylindrical area of the coupling tool withdrawal groove, and the diameter of the hole
And when the conversion head is welded at the pressure release hole on the outer wall of the petroleum casing pipe, the outer side of the coupling of the pressure release hole needs to be milled flat and then welded with the conversion head.
In addition, the pressure sensor and the conversion head are connected through a column thread, the pressure sensor 4 and the conversion head 3 are provided with matched conical sealing structures, the conversion head conical sealing surface 32 is machined to be a conical angle matched with the pressure sensor conical sealing surface 42, the conical angle tolerance is +/-15', and particularly, the internal thread 31 of the conversion head 3 is machined to be a round thread matched with the external thread 41 of the pressure sensor 4.
Further, the accuracy of the pressure sensor is 10-20 psi.
The thread oil of the tool withdrawal groove is transferred to the inner part of the conversion head 3 by processing the pressure release hole 6 in the tool withdrawal groove of the coupling in advance; by applying the method, the male thread 1 of the pipe is screwed into the female thread 2 of the coupling, redundant thread oil is extruded into the tool withdrawal groove and is continuously extruded, the thread oil is extruded into the conversion head through the pressure release hole, the pressure sensor 4 connected to the conversion head converts the detected pressure into an electric signal and transmits the electric signal to the data processing and displaying device, the signal of the screwing rotation of the joint is simultaneously input into the data processing and displaying device 8 through the rotation sensor, and the pressure-turn number (or time) is displayed in the data processing and displaying device after the data processing.
It should be noted that the data processing and displaying device may be a smart phone, a portable computer or a PC.
The working process of the invention is as follows:
the thread of the male end and the thread of the female end are coated with thread oil, the male thread of the pipe is screwed into the female thread of the coupling, along with the rotation, a part of thread oil is extruded out of the coupling, a part of thread oil is extruded into the tool withdrawal groove and is sealed to generate pressurization, the thread oil enters the conversion head through the pressure release hole of the tool withdrawal groove of the coupling and contacts the pressure sensor, the pressure sensor with high sensitivity converts the detected pressure into an electric signal and inputs the electric signal to the data processing and display device, on the other hand, the rotation signal of the pipe is simultaneously input into the data processing and display device through the rotation sensor, and is displayed with pressure-turn number (or time) after the data processing, and after the screwing is finished, the detection system can also continuously monitor the change of the thread oil suppressed pressure in the coupling along with.
By way of example, in this embodiment: measuring the thread oil pressure of a 7-in special thread joint internal tool withdrawal groove, and comprising the following steps:
according to the design of a drawing, the tool retracting groove of the coupling is arranged between 110mm and 120mm away from the end face of the coupling, the pressure release hole is positioned at 115mm away from the end face of the coupling, and the through hole is punched
Grinding burrs of the release hole;
welding after the center hole of the conversion head is aligned with the tool withdrawal groove pressure release hole;
normally coating screw thread oil on the male end and the female end of the sample joint, and manually screwing the sample joint to a hand-tight position;
using a screw-on machine, clamping a coupling by using a backup wrench, and connecting a pressure sensor;
the pressure sensor and the rotation sensor are connected to the data processing and displaying device;
the tongs are operated to effect the make-up of the joint and the change in pressure-turns (or time) can be obtained as shown in figure 3.
Claims (5)
1. The pressure detection method for the oil pressure building of the internal screw thread of the oil casing coupling is characterized by comprising the following steps of:
a pressure release hole is punched on the side wall of the tool withdrawal groove area of the petroleum casing coupling;
welding a conversion head at a pressure release hole on the outer wall of the petroleum casing pipe, wherein a central through hole is formed in the conversion head and is communicated with the pressure release hole;
mounting a pressure sensor to the transducing head and communicating with the central throughbore of the transducing head;
mounting a rotation sensor to the screw-on machine, and connecting both the pressure sensor and the rotation sensor to a data processing and display device;
and (3) coating the male threads and the female threads of the petroleum casing with screw thread oil, and screwing by using a screwing machine to obtain the pressure change of the screw thread oil pressure in the tool withdrawal groove of the coupling in the screwing process.
2. The pressure detection method for the oil tapping pressure in the oil casing coupling according to claim 1, wherein: the pressure release hole is positioned in the center of the cylindrical surface area of the coupling tool withdrawal groove, and the diameter of the hole
3. The pressure detection method for the oil tapping pressure in the oil casing coupling according to claim 1, wherein: when the conversion head is welded at the pressure release hole on the outer wall of the petroleum casing pipe, the outer side of the coupling of the pressure release hole needs to be milled flat and then welded with the conversion head.
4. The pressure detection method for the oil tapping pressure in the oil casing coupling according to claim 1, wherein: the pressure sensor and the conversion head are connected through a column thread, and the pressure sensor and the conversion head are provided with matched conical sealing structures.
5. The pressure detection method for the oil tapping pressure in the oil casing coupling according to claim 1, wherein: the accuracy of the pressure sensor is 10-20 psi.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011204095.0A CN112525415A (en) | 2020-11-02 | 2020-11-02 | Pressure detection method for oil tapping pressure in oil casing coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011204095.0A CN112525415A (en) | 2020-11-02 | 2020-11-02 | Pressure detection method for oil tapping pressure in oil casing coupling |
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| Publication Number | Publication Date |
|---|---|
| CN112525415A true CN112525415A (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011204095.0A Pending CN112525415A (en) | 2020-11-02 | 2020-11-02 | Pressure detection method for oil tapping pressure in oil casing coupling |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2549162Y (en) * | 2002-04-05 | 2003-05-07 | 天津钢管有限责任公司 | Air-tight threaded joint of petroleum casing |
| CN201116467Y (en) * | 2007-10-26 | 2008-09-17 | 于淑华 | Pumping well suppressed pressure measuring device |
| CN103335766A (en) * | 2013-06-07 | 2013-10-02 | 天津钢管集团股份有限公司 | Special-buckle petroleum casing coupling screwing information acquisition and processing system and torque calibration method |
| CN104047594A (en) * | 2014-06-27 | 2014-09-17 | 山东三田临朐石油机械有限公司 | Detection device and method for tubing coupling |
| CN104234775A (en) * | 2014-07-23 | 2014-12-24 | 上汽通用五菱汽车股份有限公司 | Measurement method of key pressure of lubricating system |
| CN204532141U (en) * | 2015-02-06 | 2015-08-05 | 江苏常宝钢管股份有限公司 | A kind of tubing and casing and box cupling twist the accurate control device connecing J value |
| CN205063845U (en) * | 2015-10-26 | 2016-03-02 | 中国石油天然气集团公司 | Crimping head is suppressed on well drilling ground |
| CN105604521A (en) * | 2016-02-23 | 2016-05-25 | 西南石油大学 | Multifunctional compression packer rubber sleeve unit experiment device |
-
2020
- 2020-11-02 CN CN202011204095.0A patent/CN112525415A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2549162Y (en) * | 2002-04-05 | 2003-05-07 | 天津钢管有限责任公司 | Air-tight threaded joint of petroleum casing |
| CN201116467Y (en) * | 2007-10-26 | 2008-09-17 | 于淑华 | Pumping well suppressed pressure measuring device |
| CN103335766A (en) * | 2013-06-07 | 2013-10-02 | 天津钢管集团股份有限公司 | Special-buckle petroleum casing coupling screwing information acquisition and processing system and torque calibration method |
| CN104047594A (en) * | 2014-06-27 | 2014-09-17 | 山东三田临朐石油机械有限公司 | Detection device and method for tubing coupling |
| CN104234775A (en) * | 2014-07-23 | 2014-12-24 | 上汽通用五菱汽车股份有限公司 | Measurement method of key pressure of lubricating system |
| CN204532141U (en) * | 2015-02-06 | 2015-08-05 | 江苏常宝钢管股份有限公司 | A kind of tubing and casing and box cupling twist the accurate control device connecing J value |
| CN205063845U (en) * | 2015-10-26 | 2016-03-02 | 中国石油天然气集团公司 | Crimping head is suppressed on well drilling ground |
| CN105604521A (en) * | 2016-02-23 | 2016-05-25 | 西南石油大学 | Multifunctional compression packer rubber sleeve unit experiment device |
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Application publication date: 20210319 |