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

A clastic rock and mud technology, which is applied in the high-efficiency drilling mud preparation process and application field of steep and dry clastic rock formations, can solve the problems of scrapped drilling, shrinking of borehole diameter, and easy disturbance of gravel, etc., and achieve safe and fast drilling. The effect of drilling and preventing flocculation

Inactive Publication Date: 2020-05-15
中广核铀业新疆发展有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.

[0056] The present invention provides a mud preparation process and application suitable for the drilling needs of steep dry clastic rock formations. Taking 400m as the boundary, two different mud systems suitable for less than 400m and more than 400m have been developed, which are used to reduce up to 400m Eliminate common engineering technical problems such as block dropping, leakage, diameter shrinkage and hole collapse, and ensure efficient construction.

[0057] figure 1 A flow chart of the mud preparation process provided by the present invention. Specific steps are as follows:

[0058] (1) The first step is the setting, installation and commissioning of the mud circulation system. The installation principles are safety, stability and operability.

[0059] (2) In the second step, add clear ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/035E21B21/00
CPCC09K8/035C09K8/24E21B21/00
Inventor 何平波刘玉龙李新卫杨凯马汉峰汪志平
Owner 中广核铀业新疆发展有限公司
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