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
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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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