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Processing method for gas reservoir sleeve joint for exploiting shale gas

The technology of a casing joint and a processing method is applied in the field of casing joint processing, which can solve the problems of large tool loss, low joint qualification rate and large deformation, and achieve the effects of improving processing efficiency, reducing production cost and overcoming large tool loss.

Inactive Publication Date: 2016-05-25
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a processing method for gas layer casing joints used in shale gas development to solve the problem that the material properties of gas layer casing joints used in shale gas development are very different from those of ordinary steel pipes. Pipe joints have strict requirements on the thread size tolerance of the joints, so problems such as large tool loss, large deformation, and low joint pass rate are prone to occur during processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In view of the above-mentioned technical problems, the processing method of the gas layer casing joint for shale gas development provided in Embodiment 1 includes the following steps:

[0032] (1) Coupling internal thread and its sealing surface processing

[0033] The processing conditions of the inner thread of the coupling are: threading, using a special CNC lathe for the coupling, according to the thread tooth shape requirements of the gas layer casing joint used in shale gas development, using a forming comb (two teeth, rough turning thread for rough turning) Comb knife, thread comb knife for finish turning), and special physical method coating (PVD), cutting speed is 110m / min. Divide into 7 times of rough turning, each time the cutting depth is 0.16mm; divide into two finishing turnings, with the cutting depth of 0.12mm and 0.18mm. The feed rate is 5.08 mm / rev (constant pitch cutting).

[0034] After the inner thread of the coupling is processed, the sealing sur...

Embodiment 2

[0042] The processing method of the gas layer casing joint for shale gas development provided by Embodiment 1 includes the following steps:

[0043] (1) Coupling internal thread and its sealing surface processing

[0044]The processing conditions of the inner thread of the coupling are: threading, using a special CNC lathe for the coupling, according to the thread tooth shape requirements of the gas layer casing joint used in shale gas development, using a forming comb (two teeth, rough turning thread for rough turning) Comb knife, thread comb knife for finish turning), and special physical method coating (PVD), cutting speed is 120m / min. Divide into 8 times of rough turning, each time the cutting depth is 0.18mm; divide it into two finishing turnings, with cutting depth of 0.12mm and 0.18mm. The feed rate is 5.08 mm / rev (constant pitch cutting).

[0045] After the inner thread of the coupling is processed, the sealing surface is processed. The specific processing conditions...

Embodiment 3

[0053] The processing method of the gas layer casing joint for shale gas development provided by Embodiment 1 includes the following steps:

[0054] (1) Coupling internal thread and its sealing surface processing

[0055] The processing conditions of the inner thread of the coupling are: threading, using a special CNC lathe for the coupling, according to the thread tooth shape requirements of the gas layer casing joint used in shale gas development, using a forming comb (two teeth, rough turning thread for rough turning) Comb knife, thread comb knife for finish turning), and special physical method coating (PVD), cutting speed is 105m / min. Divide into 6 times of rough turning, each time the cutting depth is 0.15mm; divide into two finishing turnings, the cutting depths of the two times are 0.12mm and 0.18mm. The feed rate is 5.08 mm / rev (constant pitch cutting).

[0056] After the internal thread of the coupling is processed, the sealing surface is processed. The specific pr...

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Abstract

The invention relates to the technical field of processing of sleeve joints, provides a processing method for a gas reservoir sleeve joint for exploiting shale gas, and aims at solving the problems of large cutter loss, large deformation and low qualified rate of a joint easily caused when a gas reservoir sleeve joint for exploiting shale gas is processed. The method comprises the following steps: processing a coupling internal thread; processing an inner sealing surface; processing an external thread of a tube body; and processing an outer sealing surface. According to the method provided by the invention, the defects of large cutter loss, low qualified rate of the joint and the like when the gas reservoir sleeve joint for exploiting shale gas is processed are effectively overcome; the production requirement of the gas reservoir sleeve joint for exploiting shale gas is met; the production cost is reduced; and the processing efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of casing joint processing, and in particular relates to a processing method for gas layer casing joints used in shale gas development. Background technique [0002] At present, in the field of shale gas drilling and exploitation, horizontal well drilling and completion and hydraulic fracturing technology are the key technologies, and horizontal well drilling and completion and hydraulic fracturing technology have very strict requirements on shale gas casing. At the same time, it is required that the gas layer casing can withstand various combined loads of bending, tension, compression and internal pressure, and its quality should be able to maintain a certain production life. [0003] When using gas layer casing, it is necessary to connect a branch of pipes through joint threads to form a pipe string of several thousand meters. Therefore, it is necessary to process the casing joint, that is, to process the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 赵中清黄英宋令玺黄云曾理熊祺李方应邓跃刚边华川
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM