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Construction method for preventing sleeve against damage and technology pile column

A technology for pipe strings and construction methods, which is applied in the direction of casing, drill pipe, earthwork drilling, etc., can solve the problems of preventing and preventing casing damage, casing damage, etc., to prolong life, solve casing damage, and ensure normal operation The effect of work

Active Publication Date: 2018-06-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, in the process of realizing the present invention, the inventors have found that there are at least the following problems in the prior art: none of the existing techniques for preventing casing damage can fundamentally and effectively solve the problem of casing damage

Method used

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  • Construction method for preventing sleeve against damage and technology pile column
  • Construction method for preventing sleeve against damage and technology pile column
  • Construction method for preventing sleeve against damage and technology pile column

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Embodiment Construction

[0048] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art.

[0049] In the first aspect, the embodiment of the present invention provides a construction method for preventing casing damage, see Figure 1 ~ Figure 3 , the construction method includes the following steps:

[0050] Step 101, running the expansion pipe 6 into the well and performing expansion operation on the expansion pipe 6;

[0051] Step 102, lowering the oil layer casing 11 into the expansion pipe 6;

[0052] Step 103 , injecting cement slurry 12 into the annular space between the expansion pipe 6 and the reservoir casing 11 .

[0053] In the construction method provided by t...

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Abstract

The invention discloses a construction method for preventing a sleeve against damage and a technology pile column, and belongs to the technical field of prevention of the sleeve against damage. The construction method comprises the steps of a, stretching an expansion pipe (6) into a well and conducting expansion work on the expansion pipe (6); b, stretching an oil layer sleeve (11) into the expansion pipe (6); c, injecting cement slurry into an annular space between the expansion pipe (6) and the oil layer sleeve (11). By means of the construction method, a layer of expansion pipe is added between the oil layer sleeve and mudstone or a creep layer as permanent supporting, the direct extruding and damaging effect of the mudstone or the creep layer to the oil pipe sleeve is blocked, the problems of sleeve damage, deformation, dislocation and the like generated on the mudstone or the creep layer of the oil pipe well sleeve are effectively solved, normal work of an oil and water well is guaranteed, and the life of the oil water well is prolonged.

Description

technical field [0001] The invention relates to the technical field of casing damage prevention, in particular to a construction method and a process string for preventing casing damage. Background technique [0002] In the process of oil field production, the casing will be damaged due to the extrusion damage of the casing by mudstone or creep layer. With the prolongation of oilfield water injection and production time, mudstone hydration and sand production shortage in oil layers will aggravate the damage to the casing of oil and water wells. As for the casing damage caused by oil and water wells crossing formation fault zones, it will be more serious. Casing damage will directly affect the normal production of oil and water wells, and even cause oil and water wells to stop production and be scrapped. Therefore, it is necessary to prevent casing damage. [0003] At present, the commonly used methods to prevent casing damage mainly include: casing diameter expansion by ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10
CPCE21B17/1078E21B17/1085
Inventor 齐月魁刘言理周宝义曾晓辉赵华芝文勇李瑞杨毅陈红超
Owner PETROCHINA CO LTD
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