CN-121976756-A - Drain pipe for deep coal bed gas shaft

CN121976756ACN 121976756 ACN121976756 ACN 121976756ACN-121976756-A

Abstract

The invention relates to the technical field of drainage pipes, in particular to a drainage pipe for a deep coal bed gas shaft, which comprises an inner layer pipe, a compression layer, a tensile member and an outer layer pipe; the compression-resistant layer is sleeved outside the inner layer pipe, the outer layer pipe is sleeved outside the compression-resistant layer, and a plurality of tensile pieces extending along the length direction of the compression-resistant layer are arranged between the compression-resistant layer and the outer layer pipe. The compression-resistant layer and the tensile member are arranged, so that the compression-resistant effect and the tensile effect of the drain pipe can be obviously improved, the tensile member is arranged between the compression-resistant layer and the outer layer pipe and can bear partial tensile force generated along the length direction of the drain pipe, the tensile member can well protect the compression-resistant layer, the problem that the compression-resistant layer is damaged due to the tensile force is reduced, the compression-resistant effect of the compression-resistant layer is guaranteed, the compression-resistant member can avoid the damage of the compression force to the inner layer pipe, and the overall service life of the drain pipe is prolonged.

Inventors

WANG YAN
WANG SHENGLI
WEI YONGGANG
Lv Zeyuan
WANG LIUJIE
ZHANG WEI

Assignees

河北西伯力特种橡胶有限公司

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (8)

1. The drain pipe for the deep coal bed gas shaft is characterized by comprising an inner layer pipe, a compression layer, a tensile member and an outer layer pipe; The compression-resistant layer is sleeved outside the inner layer pipe, the outer layer pipe is sleeved outside the compression-resistant layer, and a plurality of tensile pieces extending along the length direction of the compression-resistant layer are arranged between the compression-resistant layer and the outer layer pipe; The outer contour and the inner contour of the cross section of the outer layer pipe are all in a perfect circle, and the outer contour and the inner contour of the cross section of the inner layer pipe are all in a perfect circle.
2. A drainage pipe for deep coal bed gas wellbores according to claim 1 wherein a number of humidity or temperature sensors are provided between the outer and inner pipes.
3. A drainage pipe for a deep coal bed methane wellbore as claimed in claim 1, wherein the tension member is a wire rope.
4. A drainage pipe for a deep coal bed methane wellbore according to any of claims 1-3, wherein a plurality of electrical cables extending along the length of the pressure resistant layer are provided between the pressure resistant layer and the outer pipe.
5. The drainage pipe for deep coal bed gas wellbores of claim 4, wherein the outer side of the compression layer is circumferentially and uniformly provided with tensile members, the outer side of the compression layer is circumferentially and uniformly provided with cables, and the tensile members and the cables are alternately arranged at the outer side of the compression layer.
6. The drainage pipe for deep coal bed gas wellbores of claim 5, wherein a first coating layer extending along the outer side surface of the compression layer is arranged on one side of the cable line and the tensile member close to the compression layer, a second coating layer for covering the cable line and the tensile member is arranged on one side of the cable line and the tensile member close to the outer layer pipe, and the first coating layer is used for fixing the cable line and the tensile member in cooperation with the second coating layer.
7. A drainage pipe for a deep coal bed methane wellbore as claimed in claim 6 wherein the first and second cladding layers are tubular.
8. A drainage pipe for a deep coal bed methane wellbore as claimed in claim 6 wherein a wire braid extending along the inner side of the outer pipe is provided between the outer side of the second cladding layer and the outer pipe.

Description

Drain pipe for deep coal bed gas shaft Technical Field The invention relates to the technical field of drainage pipes, in particular to a drainage pipe for a deep coal bed methane shaft. Background Coalbed methane is an unconventional natural gas resource residing in coal seams, the primary component of which is methane. In the production of coalbed methane, drainage is used to reduce reservoir pressure, promote methane to be resolved into free methane, and then flows into the wellbore through the matrix and fractures to be produced. Coalbed methane is classified into shallow coalbed methane (burial depth is less than 800 m), medium-deep coalbed methane (burial depth is greater than or equal to 800m and less than or equal to 1200 m), and deep coalbed methane (burial depth is greater than 1200 m) according to burial depth. In the prior art, a water pump is usually lifted by a water drain pipe to enter a shaft for drainage, but when deep coal bed gas is mined, the depth of the shaft reaches more than 1200m (even 2500 m), so that the length of a water drain pipe extending into the deep coal bed gas shaft is very long, the dead weight is very large, the water head working pressure reaches about 30MPa, and the weight of the water pump is about two tons, so that the water drain pipe needs to have enough tensile strength and compressive capacity, however, the tensile strength and compressive capacity of the existing water drain pipe are difficult to meet the requirement of long-time stable use of the water drain pipe in the deep coal bed gas shaft. Disclosure of Invention Aiming at the problems in the prior art, the invention aims to provide a drain pipe for a deep coal bed gas shaft, which is used for solving the problems that the tensile strength and the compressive capacity of the drain pipe in the prior art are difficult to meet the requirement of long-time stable use of the drain pipe in the deep coal bed gas shaft. A drain pipe for a deep coal bed gas shaft comprises an inner layer pipe, a compression layer, a tensile member and an outer layer pipe; The compression-resistant layer is sleeved outside the inner layer pipe, the outer layer pipe is sleeved outside the compression-resistant layer, and a plurality of tensile pieces extending along the length direction of the compression-resistant layer are arranged between the compression-resistant layer and the outer layer pipe; The outer contour and the inner contour of the cross section of the outer layer pipe are all in a perfect circle, and the outer contour and the inner contour of the cross section of the inner layer pipe are all in a perfect circle. Further, a plurality of humidity sensors or temperature sensors are arranged between the outer layer pipe and the inner layer pipe. Further, the tensile member is a wire rope. Further, a plurality of cables extending along the length direction of the compression-resistant layer are arranged between the compression-resistant layer and the outer layer tube. Further, the tensile members are uniformly arranged on the outer side of the compression layer in the circumferential direction, the cables are uniformly arranged on the outer side of the compression layer in the circumferential direction, and the tensile members and the cables are arranged on the outer side of the compression layer at staggered intervals. Further, the cable conductor is provided with along compressive layer 2 lateral surface extension's first coating with tensile member one side near compressive layer, and cable conductor and tensile member are provided with the second coating that is used for covering cable conductor and tensile member near outer tube one side, and first coating is used for cooperating the second coating to fix cable conductor and tensile member. Further, the first cladding layer and the second cladding layer are tubular. Further, a wire braiding layer extending along the inner side surface of the outer layer tube is arranged between the outer side surface of the second cladding layer and the outer layer tube. The anti-compression layer and the anti-tension piece are arranged, the anti-compression effect and the anti-tension effect of the drain pipe can be obviously improved, the anti-tension piece is arranged between the anti-compression layer and the outer layer pipe and can bear partial tension generated along the length direction of the drain pipe, the anti-compression layer can be well protected by the anti-tension piece, the problem that the anti-compression layer is possibly damaged due to the tension is reduced, the anti-compression effect of the anti-compression layer is conveniently ensured, the anti-compression piece can avoid the damage of pressure to the inner layer pipe, and the overall service life of the drain pipe is prolonged. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the specification will be briefly