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Polymer and bentonite drilling mud

A technology of drilling mud and bentonite, which is applied in the directions of drilling compositions, chemical instruments and methods to prevent hole collapse, ensure fluidity and good rheological properties

Inactive Publication Date: 2012-10-31
捷高科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of smaller aperture and shorter crossing length has relatively low requirements for drilling mud. However, with crossing projects with large apertures and long construction sections, such as the West-East Gas Pipeline, if you choose conventional drilling mud, will cause a series of process problems

Method used

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Examples

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Comparison scheme
Effect test

Embodiment Construction

[0013] The invention develops a mud product with high porosity, good retaining performance and high-efficiency drilling. It adopts bentonite as the main slurry mixing material, and achieves high suspension, high slurrying, high retaining wall and high dynamic performance. Bentonite has strong hygroscopicity, and after absorbing water, it swells up to 30 times its own volume. It can be dispersed in water as a colloidal suspension, which has certain viscosity, thixotropy and lubricity. Combining with high-molecular polyacrylamide organic matter can enhance its viscosity and improve its ability to carry drill cuttings. Combining with carboxymethyl cellulose organic matter can improve its colloid performance, improve water retention and wall protection ability. Through the above performance characteristics and a large number of tests, the mud with large aperture and long distance crossing was developed and applied to the longest pipeline crossing project in China at present.

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Abstract

The invention relates to polymer and bentonite drilling mud which is formed by mixing bentonite powder and a polymer, wherein the polymer is a mixture of carboxymethyl cellulose and polyacrylamide; the mass ratio of the bentonite powder to the polymer is 100: (1-3); and the mass ratio of carboxymethyl cellulose to polyacrylamide is (15-30): 1. The polymer and bentonite drilling mud is formed by mixing sodium-based bentonite, a viscosity-enhancing polymer and a leakage-reducing polymer additive; drillings and sandstone in a drilling fluid can be effectively suspended and carried; thin and compact mud films can be formed under drilling pressure; moisture in the drilling fluid is prevented from penetrating into gaps on a well wall and running off into the stratum; the drillings are effectively suspended while at rest; and meanwhile, the pressure of a drill bit is favorably reduced and the service life of a drill tool is prolonged.

Description

technical field [0001] The invention relates to bentonite drilling mud, in particular to a polymer bentonite drilling mud, which is used for pipeline crossing, horizontal directional drilling, oil drilling, shield tunneling, trenchless and municipal construction and the like. Background technique [0002] Horizontal directional drilling pipeline crossing has been widely used in the pipeline construction of municipal, communication, electric power, gas, petroleum, tap water and so on. The hole diameter of the construction is getting bigger and bigger, the traversing length is getting longer and longer, and there are more and more situations of drilling through different geology. The process of smaller aperture and shorter crossing length has relatively low requirements for drilling mud. However, with crossing projects with large apertures and long construction sections, such as the West-East Gas Pipeline, if you choose conventional drilling mud, It will cause a series of pro...

Claims

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Application Information

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IPC IPC(8): C04B26/28C09K8/24
Inventor 许延文王云沈晴
Owner 捷高科技(苏州)有限公司
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