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Drilling shaft lining stabilizer

A wellbore stabilizer and drilling technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as large reservoir damage, achieve simple construction process, enhance wellbore stability, and improve drilling fluid performance Effect

Inactive Publication Date: 2009-02-11
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, bromine salt and calcium salt completion fluids are widely used, and bromine salt and calcium salt completion fluids are easy to interact with underground fluids, including oil, natural gas, groundwater, seawater for well washing, carbon dioxide, etc. more damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The raw material composition of this embodiment is: 30 parts of dimethyl 2 allyl ammonium chloride, 3 parts of dimethyl 2 allyl ammonium chloride-acrylamide polymer, 3 parts of nonionic surfactant OP-10, 2 parts of nonionic fluorosurfactant, 2 parts of cellulase, 3 parts of potassium chloride, and 57 parts of water; the molecular weight of the dimethyl 2 allyl ammonium chloride-acrylamide polymer is 400,000, and the The nonionic fluorosurfactant is SUNF-01, a fluorine-containing alkyl ethoxy ether alcohol nonionic surfactant, and the cellulase is cellulase SUNWEE-010.

[0024] Its preparation method is: weigh dimethyl 2 allyl ammonium chloride, dimethyl 2 allyl ammonium chloride-acrylamide polymer, nonionic surfactant OP-10, Ethoxyl ether alcohol non-ionic fluorosurfactant SUNF-01, cellulase SUNWEE-010, potassium chloride and water, after mixing, fully stir, so that all components are mixed evenly, and the finished well wall stabilizer is obtained.

Embodiment 2

[0026] The raw material composition of this embodiment is: 20 parts of dimethyl 2 allyl ammonium chloride, 2 parts of dimethyl 2 allyl ammonium chloride-acrylamide polymer, 1 part of nonionic surfactant OP-10, 2 parts of nonionic fluorosurfactant, 3 parts of cellulase, 5 parts of potassium chloride, and 67 parts of water; the molecular weight of the dimethyl 2 allyl ammonium chloride-acrylamide polymer is 350,000, and the The nonionic fluorosurfactant is SUNF-01, a fluorine-containing alkyl ethoxy ether alcohol nonionic surfactant, and the cellulase is cellulase SUNWEE-010.

[0027] The preparation method of this embodiment is the same as that of Example 1.

Embodiment 3

[0029] The raw material composition of this embodiment is: 35 parts of dimethyl 2 allyl ammonium chloride, 5 parts of dimethyl 2 allyl ammonium chloride-acrylamide polymer, 5 parts of nonionic surfactant OP-10, 1 part of nonionic fluorosurfactant, 1 part of cellulase, 5 parts of potassium chloride, and 48 parts of water; the molecular weight of the dimethyl 2 allyl ammonium chloride-acrylamide polymer is 450,000, and the The nonionic fluorosurfactant is SUNF-01, a fluorine-containing alkyl ethoxy ether alcohol nonionic surfactant, and the cellulase is cellulase SUNWEE-010.

[0030] The preparation method of this embodiment is the same as that of Example 1.

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PUM

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Abstract

The invention discloses a boring well wall stabilizer which is mainly used for solving the technical problem that storage layer is damaged due to unstable well wall and expansion of clay during the boring process; the well wall stabilizer consists of 20-35 parts of diallyldimethylammonium chloride, 2-5 parts of diallyldimethylammonium chloride-acrylamide polymer, 1-5 parts of non-ionic surfactant OP-10, 1-2 parts of fluoride-bearing alkyl ethoxy ether alcohol non-ionic surfactant, 1-3 parts of cellulose, 1-5 parts of KCl and 45-74 parts of water, according to the weight parts. The stabilizer can stabilize the well wall, greatly reduces the expansion rate of the clay at storage layer and eliminates the damages on the storage layer.

Description

technical field [0001] The invention belongs to the technical field of well completion engineering, and in particular relates to a drilling well wall stabilizer suitable for stabilizing the well wall, preventing clay expansion and eliminating reservoir damage during the well completion process. Background technique [0002] Oilfields use drilling fluid to clean and cool the drill bit during the drilling process, as well as to carry cuttings, rocks, soil or sand loosened by the drill bit. In addition, the drilling fluid can also reduce formation damage. Lining or smearing to prevent subsidence and by using drilling fluids to prevent the invasion of liquid and solid particles into permeable formations. [0003] However, in many areas, shale is sensitive to water and is unstable in the presence of water, so it swells or disperses when it encounters water. As a result, the cuttings are broken into smaller particles. At this time, the broken particles must be separated from the c...

Claims

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Application Information

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IPC IPC(8): C09K8/44
Inventor 屈展王俊奇盖海防陈军斌
Owner XI'AN PETROLEUM UNIVERSITY
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