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Lifting tool for sheared-off continuous oil tube and using method

A technology of oil pipes and tools, which is applied in the field of tight gas field exploitation, can solve the problems of complicated process and high safety risk, and achieve the effects of reduced safety risk, improved construction efficiency and high tensile strength

Inactive Publication Date: 2020-05-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this process needs to cut the unstuck coiled tubing and locking tool together to reverse the equipment. The process is complicated, and there is only one plug inside the coiled tubing for sealing during the entire tubing process, which poses a high safety risk.

Method used

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  • Lifting tool for sheared-off continuous oil tube and using method
  • Lifting tool for sheared-off continuous oil tube and using method
  • Lifting tool for sheared-off continuous oil tube and using method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 and figure 2 As shown, a lifting tool for cut coiled tubing includes a mandrel 2-8, the mandrel 2-8 is covered with a rolling groove, and the mandrel 2-8 below the rolling groove is covered with a sealing rubber cylinder 2- 10. The mandrel 2-8 above the rolling groove is covered with a pressing piece, and the bottom end of the mandrel 2-8 is connected with a stud head 2-11.

[0025] The pressing part is a nut 2-1, and the mandrel 2-8 is provided with threads matching the nut 2-1.

[0026] The outer diameter of the stud head 2-11 is larger than the outer diameter of the sealing rubber cylinder 2-10.

[0027] The bottom end of the mandrel 2-8 is connected with a stud head 2-11, the outer diameter of the stud head 2-11 is longer than that of the sealing rubber cylinder 2-10, and the bottom of the sealing rubber cylinder 2-10 falls on the stud head 2-11 surface, so that when the sealing rubber cylinder 2-10 is squeezed, the bottom of the sealing rubber ...

Embodiment 2

[0029] Such as figure 1 and figure 2 As shown, on the basis of Embodiment 1, a limiting boss 2-5 is connected in the middle of the rolling groove, and the rolling groove is divided into an upper rolling groove and a lower rolling groove by the limiting boss 2-5.

[0030] The upper rolling groove includes a first rolling groove 2-2, a second rolling groove 2-3 and a third rolling groove 2-4 from top to bottom, the first rolling groove 2-2, the second rolling groove The groove depths of rolling groove 2-3 and the third rolling groove 2-4 are gradually deepening.

[0031] The lower rolling groove includes the fourth rolling groove 2-6, the fifth rolling groove 2-7 and the sixth rolling groove 2-9 from top to bottom, the fourth rolling groove 2-6, the fifth rolling groove Rolling groove 2-7 and the 6th rolling groove 2-9 groove depth are progressively deepening type.

[0032] The limiting boss 2-5, the upper rolling groove and the lower rolling groove are integrally formed.

...

Embodiment 3

[0037] Such as figure 1 and figure 2 Shown, on the basis of embodiment 2, a kind of use method of the lifting tool that has cut coiled tubing may further comprise the steps:

[0038] The first step is to dock with the coiled tubing 3, and insert the end of the lifting tool 2 with the stud head 2-11 downward into the upper end of the coiled tubing 3 of the natural gas wellbore until the limit boss 2-5 withstands the coiled tubing 3 The end of the lifting tool 2 with the stud head 2-11 is lowered into the wellbore until the limit boss 2-5 withstands the port of the coiled tubing 3 that should be lifted below the lifting tool 2.

[0039] The second step is to roll the coiled tubing 3, using a rolling tool to roll the coiled tubing 3 to the fourth rolling groove 2-6, the fifth rolling groove 2-7 and the sixth rolling groove 2-9 in sequence Top: Roll the upper end of the coiled tubing 3 to the fourth rolling groove 2-6, the fifth rolling groove 2-7 and the sixth rolling groove o...

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Abstract

The invention provides a lifting tool for a sheared-off continuous oil tube and a using method. The lifting tool comprises a mandrel, wherein a rolling slot sleeves outside the mandrel; a sealing rubber sleeve sleeves the mandrel below the rolling slot; a pressing part sleeves the mandrel above the rolling slot; the bottom end of the mandrel is connected to a stud head; a limiting lug boss is further connected in the middle of the rolling slot; and the rolling slot is divided into an upper rolling slot and a lower rolling slot through the limiting lug boss. Through the lifting tool, a continuous oil tube and a pre-arranged continuous oil tube are connected together, so that complex high-risk continuous oil tube crane lifting operation is converted into conventional continuous oil tube operation during lifting, and therefore, construction efficiency is greatly improved, and the safety risk is remarkably reduced. The lifting tool adopts an up-down symmetrical type three-rolling-slot design, adopts a gradual deepening type design for slot depth, has tensile load equivalent to tensile strength of the continuous oil tube, is simple in design and is high in tensile strength.

Description

technical field [0001] The invention belongs to the technical field of tight gas field exploitation, and in particular relates to a lifting tool for a cut coiled tubing and a using method thereof. Background technique [0002] The main principle of the velocity string drainage gas recovery technology is to run a small-diameter coiled tubing into the natural gas wellbore, cut it and hang it at the wellhead of the gas well as a production string. And other advantages have become one of the three major drainage gas recovery technologies of PetroChina Changqing Gas Field, which has been applied to more than 900 wells in total. With the increase of low pressure and low production gas wells year by year, the application scale is bound to be further expanded. When the gas well is in the later stage of production, due to the gradual decay of the energy of the gas well, the actual production of the gas well is lower than the critical liquid-carrying flow rate of the coiled tubing in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/20E21B31/12
CPCE21B31/12E21B31/20
Inventor 赵彬彬王宪文白晓弘刘双全王晓荣姚坚陈勇杨丹丹李丽
Owner PETROCHINA CO LTD
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