Water-based drilling fluid composition for trenchless drilling

A technology of water-based drilling fluid and composition, which is applied in the direction of drilling composition, earthwork drilling, wellbore/well components, etc., and can solve problems such as deformation, hole wall stability, and serious accident consequences

Inactive Publication Date: 2015-05-13
SHANGHAI MUNICIPAL GAS NO2 PIPELINES ENGINEERING CO LTD
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Problems solved by technology

However, as a near-surface underground excavation project, horizontal directional drilling and pipelaying will inevitably cause varying degrees of deformation of the surrounding soil and surface, which will have a certain impact on the stability of the hole wall, especially for surface buildings and Consequences of accidents caused by construction are more severe in densely populated urban areas

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  • Water-based drilling fluid composition for trenchless drilling
  • Water-based drilling fluid composition for trenchless drilling
  • Water-based drilling fluid composition for trenchless drilling

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[0028] During the drilling process, when the drill pipe is changed or the equipment fails, the mud circulation will stop. At this time, it is required that the mud system can form a space grid structure in a short period of time, so as to suspend cuttings or weighting agents, or sink at a very slow speed; when the pump is turned on, the pump pressure should not rise too high to prevent leakage Strata. Therefore, the main factors that provide suspension capacity are the static shear force and thixotropy of the mud.

[0029]The so-called static shear force of the mud, its colloidal chemical essence is the gel strength, that is, the strength of the space grid structure formed by the mud in the static state. The initial shear force and final shear force are used to express the relative value of the static shear force on site. The initial shear force refers to the static shear force measured after the mud has been fully stirred for 1 minute (or 10 seconds); the final shear force ...

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Abstract

The invention discloses a water-based drilling fluid composition for trenchless drilling. The water-based drilling fluid composition for the trenchless drilling is used for horizontally and directionally drilling a sludge layer, a silt layer and a clay layer, and comprises bentonite, Laian clay or Harley soil, an anti-collapse agent, polyacrylamide, a fluid loss agent, sulfonated phenol-formaldehyde resin, a lubricant and the balance of water, wherein the anti-collapse agent can be any one of potassium humate, asphalt powder, sulfonated asphalt powder and a coal-alkali reagent; the fluid loss agent can be any one of hydrolyzed polyacrylonitrile and sodium carboxymethyl cellulose; the lubricant can be any one of an extreme-pressure lubricant, polyoxyethylene octylphenol ether and sulfonated tall oil asphalt. The invention further discloses a method for controlling mud fluid loss by using the water-based drilling fluid composition. The water-based drilling fluid composition has good effects of ensuring stability of a hole wall, carrying and suspending rock debris, stabilizing a well wall, balancing formation pressure, cooling and lubricating a drill bit and drilling tool, and the like, so that engineering can be economically and efficiently completed; the water-based drilling fluid composition has a great practical significance for a construction enterprise.

Description

technical field [0001] The invention relates to the field of urban construction, in particular to a water-based drilling fluid composition for trenchless drilling. Background technique [0002] Trenchless mud refers to a fluid with a certain viscosity. Most of them use water as the base slurry and dispersible powder and chemical substances as the main agent. General term for circulating fluid. The performance of the mud is the macroscopic reaction of the chemical and physical interactions between the various components of the mud. The parameters that can be used to evaluate the performance of the mud mainly include density (heaviness or specific gravity), rheology (viscosity and shear force), lubricity, Colloid rate, sand content, fluid loss (water loss and mud cake thickness), solid content, PH value, etc. These performance parameters directly affect the drilling speed, hole wall stability, drilling tool wear, lubrication and drag reduction, and hole purification. [000...

Claims

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Application Information

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IPC IPC(8): C09K8/24E21B21/00
CPCC09K8/24C09K2208/34E21B21/003
Inventor 戴斌张帆赵官慧蔡晓春
Owner SHANGHAI MUNICIPAL GAS NO2 PIPELINES ENGINEERING CO LTD
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