Preparation process and application of slurry for high-efficiency drilling of steep and sparse clastic rock stratum

Abstract

The invention discloses a preparation process of a slurry for high-efficiency drilling of a steep drainage clastic rock stratum. Various components added in slurry are optimized, corresponding proportional relations are adjusted, and the slurry is prepared by adopting different proportions aiming at working areas with the characteristics of many conglomerate layers, poor cementation, sand-mud interbedding, thick layers and steep drainage of the stratum. The slurry is prepared by adjusting the drilling depth: a coarse dispersion low-solid-phase mud system is adopted for a drilled hole with thedesigned depth within 400 m; and for a drill hole with the design depth larger than 400 m, a film-forming wall-protecting low-solid-phase mud system is adopted. Materials used in the invention comprise sodium bentonite, an anti-collapse while-drilling plugging agent, potassium chloride, a tackifier, a film forming agent B, modified asphalt and a fluid loss agent, and can also comprise high-viscosity cellulose, a high-efficiency lubricant and a coating agent. By the adoption of the slurry, high-efficiyenc drilling in the abrupt clastic rock stratum of a certain uranium mine area is achieved, and the engineering problems of hole leakage, chipping, hole collapse, hole shrinkage and the like are avoided.

Description

technical field [0001] The invention belongs to the technical field of optimization and improvement of drilling technology in mineral resources exploration, relates to drilling mud configuration technology, in particular to a high-efficiency drilling mud preparation technology and application in steep dredged clastic rock formations, which can effectively solve the problem of steep dredged clastic rock formations The technical problems that often occur in the drilling construction in the formation, such as falling blocks, leaking wells, shrinkage, and hole collapse, seriously affect the progress and efficiency of drilling construction. The mud configured can reduce the slow progress and scrapped drilling caused by accidents in the hole, thereby improving Drilling construction efficiency and economic benefits. Background technique [0002] Drilling is the most important and commonly used means of mineral resource exploration. It is the process of taking samples of underground...

AI Technical Summary

Problems solved by technology

[0005] If the mud leaks during the drilling process (leakage), the rock powder cannot be brought out in time, the temperature of the drill bit is too high and the drill is burned, or the hole wall is unstable and collapses, resulting in buried drill, and eventually the drill hole is scrapped

At the same time, during the drilling process, if the expansion coefficient of the rock formation is large or the water-sensitive formation will lead to serious shrinkage of the borehole diameter, it will seriously affect the smooth progress of the drilling construction.

At the same time, due to the steepness of the formation, the drill bit cannot drill into the vertical layer, and the angle between the drill bit and the formation is small, which easily makes the gravel on the layer more susceptible to disturbance, so the risk of hole deviation is greatly increased

[0006] How to reduce drilling accidents and realize high-efficiency drilling is the primary problem to be solved, which cannot be solved by existing technologies

On-site implementation is often done by adding some cementation and plugging materials, but with little effect

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