Underground hot-melting cast tube wall protection method

A technology of well wall and wall material, which is applied in earth-moving drilling, wellbore/well components, sealing/packaging, etc. The effect of mechanical strength and stability, reduced maintenance costs, and simple technical process

Inactive Publication Date: 2010-10-20
李国民 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The key factor for the smooth implementation of the drilling (well) project is the stability of the hole wall. Drilling in complex formations such as soft, weakly cemented and unstable formations often requires complex mud technology and multi-layer technical casings to ensure the stability of the hole wall. The stability and the smooth implementation of drilling work, but the problems of these retaining wall technologies are: the cost of mud and casing is huge, the drilling structure is complicated, and the drilling cost is high
[0003] Some people have proposed a technical solution for corrugated casing, but it is also difficult to implement the technical solution for corrugated casing. Sometimes the retaining wall cannot be expanded smoothly, and sometimes the hole wall collapses before the bellows is lowered into the hole, which affects the drilling performance Going smoothly, sometimes even causing the drilling to be scrapped, resulting in a huge waste of manpower, material and financial resources

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The downhole hot-melt casting pipe protection wall technology of the present invention, its technology comprises the following several steps:

[0020] (1) Determine the position of the downhole that needs the retaining wall, that is, the height from the wellhead and the height of the well wall that needs to be processed with cast pipe retaining wall, and determine that the well wall formation material at the retaining wall position is meltable sandstone;

[0021] (2) Lower the electric heating device into the well to heat the well wall sandstone to melt;

[0022] (3) Extrude the molten sandstone to the surroundings with a tube or columnar extrusion tool. After the sandstone cools and gradually deforms, lift it up and take out the mold, and the molten material is shaped into a tubular pipe wall.

Embodiment 2

[0024] The downhole hot-melt casting pipe protection wall technology of the present invention, its technology comprises the following several steps:

[0025] (1) Determine the position of the downhole protection wall, that is, the height from the wellhead and the height of the well wall that needs to be treated with cast pipe protection wall; put a columnar or tubular graphite mold into the well and position it at the center, and put in organic or inorganic materials or fusible Fusible materials such as metals;

[0026] (2) The molten material is heated and melted by an electric heating device lowered into the well;

[0027] (3) The molten material is gradually cooled and the molten material is shaped into a tube wall.

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PUM

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Abstract

The invention relates to an underground hot-melting cast tube wall protection technology. Hard and compact tube wall is formed by the following steps: fusing a tube formation material underground, shaping the fused tube formation material, and cooling to solid into tube wall. The technology is simple and has wide application range, the use cost is low, thus being capable of realizing the purposes of reducing maintenance cost of a rockshaft, prolonging the service life of the rockshaft, and effectively saving energy and reducing emission.

Description

technical field [0001] The invention relates to an underground protection wall technology, which belongs to the technical field of drilling engineering. Background technique [0002] The key factor for the smooth implementation of the drilling (well) project is the stability of the hole wall. Drilling in complex formations such as soft, weakly cemented and unstable formations often requires complex mud technology and multi-layer technical casings to ensure the stability of the hole wall. The stability and the smooth implementation of drilling work, but the problems of these retaining wall technologies are: the cost of mud and casing is huge, the drilling structure is complicated, and the drilling cost is high. When the casing wall is protected, the diameter of the re-drilled hole is correspondingly reduced by one level for each layer of casing, especially under the condition that the diameter cannot be changed after the last level of technical casing is lowered, it is diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/10
Inventor 李国民刘宝林马孝春
Owner 李国民
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