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A shrinkable borehole wall joint suitable for deep formations and its construction method

A formation and well wall technology, applied in the field of shrinkable well wall joints, can solve the problems of unguaranteed water-stopping effect of joint structure and easy water leakage, and achieve good vertical shrinkage, reliable waterproof ability, and low quality requirements. Effect

Active Publication Date: 2021-12-17
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is that the water-stop effect cannot be guaranteed after the joint structure is compressed: the joint is prone to water leakage after compression

Method used

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  • A shrinkable borehole wall joint suitable for deep formations and its construction method
  • A shrinkable borehole wall joint suitable for deep formations and its construction method
  • A shrinkable borehole wall joint suitable for deep formations and its construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] refer to Figure 1~3 , this embodiment provides a retractable wellbore joint suitable for deep formations, including a joint upper assembly 100 and a joint lower assembly 200, the joint upper assembly 100 and the joint lower assembly 200 form a shrinkable wellbore joint, the whole It is ring-shaped; wherein, the joint upper assembly 100 includes an upper flange 101, an upper welding structure 102 connected with the upper flange 101, the upper flange 101 is an annular disk, and the upper welding structure 102 is also annular; the lower joint assembly 200, It includes a lower flange 201 and a lower welded structure 202 connected to the lower flange 201. The flange 201 is an annular plate, and the lower welded structure 202 is also annular; between the upper flange 101 and the lower welded structure 202, a A second support plate 203 is arranged between the first support plate 103 , the lower flange 201 and the lower welding structure 202 , the first support plate 103 and t...

Embodiment 2

[0056] refer to Figure 1~5 , is the second embodiment of the present invention, this embodiment is based on the previous embodiment, and differs from the previous embodiment in that:

[0057] In order to understand the mechanical and waterproof properties of the shrinkable shaft wall joints in the whole process of stress, the joints provided in this example and the two joints in the prior art respectively adopt the following loading models: (1) Under the action of vertical load, the shrinkable joints Model vertical deformation characteristic test; (2) model strength test of shrinkable joint under lateral load (plane strain); (3) model strength test of shrinkable joint under triaxial load.

[0058] Among them, set Figure 4 For scheme A, Figure 5 It is scheme B, and this application is scheme C.

[0059] The joint in this example simulates similar conditions to the two joints in the prior art. First, the size of the model specimen of the vertically loaded shrinkable joint ...

Embodiment 3

[0091] refer to Figure 1~3 , is the third embodiment of the present invention, this embodiment is based on the first embodiment, and differs from the previous embodiment in that:

[0092] A construction method for shrinkable borehole wall joints suitable for deep formations includes the following steps:

[0093] S1: Preparation before construction, welding the second waterproof steel ring 800 on the annular steel backing plate 600, and inserting the second waterproof steel ring 800 into the well wall when constructing the well wall;

[0094] S2: Weld the lower flange 201 and the annular steel backing plate 600, set the welding spot inside the wellbore, inject concrete into the lower flange 201 and vibrate the concrete through the vibrating hole 601, and then place the lower welded structure 202 The welding with the lower flange 201 is completed, and one end of the inner vertical plate 500 and the second support plate 203 is welded on the lower flange 201;

[0095] S3: Weld ...

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Abstract

The invention discloses a retractable borehole wall joint suitable for deep formations, comprising: an upper assembly of the joint, including an upper flange, and an upper welding structure connected with the upper flange; a lower assembly of the joint, including a lower joint A blue plate, a lower welded structure connected to the lower flange; a first support plate is arranged between the upper flange and the lower welded structure, and a connection between the lower flange and the lower welded structure A second support plate is arranged between them; the present invention can effectively reduce the vertical additional force acting on the well wall vertically by arranging several shrinkable joints vertically on the well wall, so as to ensure the safety of the well wall structure. Field tests The results show that under the action of high vertical load, the shrinkable shaft wall joint has good vertical shrinkability, high pressure relief capacity and reliable waterproof capacity. The implementation of this technology can effectively prevent the damage of the shaft wall structure due to the vertical force, save the later maintenance cost of the shaft wall structure, and ensure the safety of coal mine excavation.

Description

technical field [0001] The invention relates to the field of mine construction, in particular to a shrinkable shaft wall joint suitable for deep formations. Background technique [0002] Since the 1980s, a large number of shaft wall rupture accidents (according to statistics, more than 150) have occurred in my country's Anhui Lianghuai, Jiangsu Xuzhou, Henan Yongxia, Shandong Yanzhou and Heilongjiang Dongrong mining areas. Shaft wall concrete cracking and spalling, steel bar bending and exposure, vertical shaft shaft deformation, water gushing and tank jamming, etc. In severe cases, it will cause shaft wall rupture, water inrush and sand damage, well flooding, ground subsidence, cracking of ground buildings, and mine shutdown. Safety accidents have brought huge economic losses to coal mines and seriously threatened the safe production of coal mines and the personal safety of workers. [0003] Field observations show that the shaft wall fracture zones mentioned above all occur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D5/11E21D5/12
CPCE21D5/11E21D5/12
Inventor 姚直书程桦荣传新蔡海兵黄献文王佳奇
Owner ANHUI UNIV OF SCI & TECH