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Guiding hole wall protecting slurry

A pilot hole and mud technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of reducing the drilling speed, weakening the impact function of the drill bit, and poor wall protection effect

Pending Publication Date: 2022-03-08
THE 8TH GRP OF CHINA RAILWAY 1ST ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the mud is too thin, the slag removal ability is small and the wall protection effect is poor; if the mud is too thick, the impact function of the drill bit will be weakened and the drilling speed will be reduced

Method used

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  • Guiding hole wall protecting slurry
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the actual directional drilling crossing construction process, it involves the technological process of drilling pilot holes, reaming, and pulling back pipes.

[0035] In the present embodiment, the guide hole wall protection mud, the mud is calculated according to parts by weight, and its composition ratio is as follows: comprise 70-75 parts of water, 20-28 parts of bentonite, and a content of 2% of bentonite weight additive, according to the directional drilling Prepare mud in each stage of pilot hole, pre-reaming and pull-back:

[0036] The mud in the pilot hole drilling stage uses the following raw materials in proportions by weight: 7-8 parts of bentonite, 0.2-0.4 parts of additives, 0.1-0.3 parts of fluid loss control agent;

[0037] The mud in the pre-expansion stage uses the following ratios of raw materials: 7-8 parts of bentonite, 0.3-0.5 parts of viscosity enhancing agent, and 0.1-0.4 parts of fluid loss control agent;

[0038] The mud in the pull-back st...

Embodiment 2

[0054] The difference between the present embodiment and the first embodiment is that the guide hole wall protection mud is calculated in parts by weight, and its composition ratio is as follows: including 75 parts of water, 28 parts of bentonite, and an additive with a content of 2% by weight of bentonite. Prepare mud at each stage of pilot hole, pre-expanding and pullback in directional drilling:

[0055] The mud in the pilot hole drilling stage uses the following raw materials in proportions by weight: 8 parts of bentonite, 0.4 parts of additives, and 0.3 parts of fluid loss control agent;

[0056]The mud in the pre-expansion stage uses the following proportions of raw materials: 8 parts of bentonite, 0.5 part of viscosity increasing agent, and 0.4 part of fluid loss reducer;

[0057] The mud in the pull-back stage uses the following proportions of raw materials: 8 parts of bentonite, 0.5 parts of viscosity increasing agent, 0.4 parts of fluid loss control agent, and 3 part...

Embodiment 3

[0059] The difference with Embodiment 1 is: the mud for the wall protection of the pilot hole, and the mud is calculated according to parts by weight. Prepare mud in each stage of pilot hole, pre-reaming and pull-back:

[0060] The mud in the pilot hole drilling stage uses the following raw materials in proportions by weight: 7.5 parts of bentonite, 0.3 parts of additives, and 0.2 parts of fluid loss control agent;

[0061] The mud in the pre-expansion stage uses the following proportions of raw materials: 7.5 parts of bentonite, 0.4 parts of viscosity enhancing agent, and 0.3 parts of fluid loss reducer;

[0062] The mud in the pull-back stage uses the following proportions of raw materials: 7.5 parts of bentonite, 0.4 parts of viscosity enhancer, 0.3 parts of fluid loss control agent, and 2.5 parts of lubricant.

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Abstract

The invention relates to the technical field of slurry used in a drilling technology, and discloses guide hole wall protecting slurry which comprises the following components: water, bentonite and an additive, the slurry is prepared according to the stages of directional drilling of a guide hole, pre-reaming and back dragging; the slurry in the stage of drilling of the guide hole is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.2-0.4 part of an additive and 0.3 part of a filtrate reducer; the slurry in the pre-reaming stage is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.3-0.5 part of a viscosity improving agent and 0.4 part of a filtrate reducer; the slurry in the back-dragging stage is prepared from the following raw materials in parts by weight: 7-8 parts of bentonite, 0.3-0.5 part of a viscosity improving agent, 0.4 part of a filtrate reducer and 2-3 parts of a lubricating agent. The phenomena of difficult hole forming and reaming, hole collapse, drill jamming and the like can be avoided.

Description

technical field [0001] The invention relates to the technical field of mud used in drilling technology, in particular to a mud for guiding hole wall protection. Background technique [0002] Trenchless directional drilling mainly uses the underground positioning system to ensure that the drilling rig completes the pilot hole according to the predetermined trajectory through the method of guiding and reaming in stages, so as to achieve the purpose of accurate pipe laying. [0003] The advantages of non-excavation directional drilling construction avoid the large impact on traffic, surrounding buildings and underground pipelines in excavation construction, and the waste of resources caused by large-scale demolition and restoration of road surfaces and houses, and the construction period is short. It can effectively avoid problems such as landslides during excavation of trenches with a buried depth of more than 4m, thereby avoiding problems such as construction safety of operat...

Claims

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Application Information

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IPC IPC(8): C09K8/00C09K8/50
CPCC09K8/00C09K8/50C09K2208/34C09K2208/12C09K2208/28
Inventor 冉兵张伟姜建国刘璘俊李洵
Owner THE 8TH GRP OF CHINA RAILWAY 1ST ENG CO LTD
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