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Method for enabling drill hole to pass through goaf leakage section

A goaf and leakage technology, which is used in earth-moving drilling, wellbore/well components, sealing/packaging, etc., can solve the problems of drilling fluid leakage, easy occurrence of sticking, and interference in drilling control, so as to ensure Continuity, guaranteeing the effect of safety

Active Publication Date: 2017-05-31
HUAIBEI MINING IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The goaf is a "cavity" created under the surface by human excavation or natural geological movement. Because the underground goaf has the characteristics of strong concealment, poor spatial distribution characteristics, and unpredictable roof collapse in the goaf, drilling Drilling accidents such as drill sticking are very likely to occur in the goaf, and drilling through the goaf due to the phenomenon of complete leakage of drilling fluid will cause great interference in drilling control and even lead to drilling accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The goaf with a coal seam thickness of ≤2m is poured with cement and water glass double slurry to form a cone at the bottom of the goaf. The mass ratio of cement to water glass in the cement and water glass double slurry is 3:1, and the cement slurry The specific gravity is 1.5~1.7kg.

Embodiment 2

[0020] In the goaf with a coal seam thickness of 4m, with the borehole as the center, cement and water glass double slurry injection is used to form a similar cone-shaped rock mass with a radius of 5 to 10m at the bottom of the goaf; the cement and water glass double slurry The mass ratio of cement to water glass is 4:1, and the specific gravity of cement slurry is 1.5-1.7kg.

Embodiment 3

[0022] Multiple coal seams are superimposed on a goaf with a thickness of 10m. At the bottom of the goaf, a fixed cone is formed by pouring mixed slurry through drilling holes. The mixed slurry uses cement, sodium silicate double slurry mixed aggregate and sand to form a cone at the bottom of the coal seam , wherein the mass ratio of cement to water glass is 3:1, the specific gravity of cement slurry is 1.5-1.7kg, the aggregate is yellow sand, and the particle size of the aggregate is 7mm.

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Abstract

The invention discloses a method for enabling a drill hole to pass through a goaf leakage section. The method comprises the steps that grouting plugging is performed through a drill hole, wherein a leakage plugging agent is adopted for forming a complete similar rock mass at a goaf; according to grouting plugging, when the thickness of a coal seam of the goaf is not larger than 2 m, dual slurry of cement and water glass is adopted for grouting, and a cone-shaped body is formed at the bottom of the goaf; when the thickness of the coal seam of the goaf is 2-5 m, the drill hole is adopted as the center, dual slurry of cement and water glass is adopted for grouting, and the similar cone-shaped body with the radius being 5-10 m is formed at the bottom of the goaf; when the thickness of multiple stacked coal seams or a single coal seam of the exploited goaf is larger than 5 m, mixed slurry is grouted into the bottom of the goaf through the drill hole to form a solid cone-shaped body. By adopting the technical scheme, dual slurry of cement and water glass is adopted for grouting, a water plugging body of the cone-shaped rock mass is rapidly formed within the range that the track of the drill hole passes through the goaf, and the safety of the drill hole is ensured.

Description

technical field [0001] The invention belongs to the field of coal mining, and more specifically, the invention relates to a method for drilling through a lost section in a goaf. Background technique [0002] The goaf is a "cavity" created under the surface by human excavation or natural geological movement. Because the underground goaf has the characteristics of strong concealment, poor spatial distribution characteristics, and unpredictable roof collapse in the goaf, drilling Drilling accidents such as drill sticking are very likely to occur in goafs, and drilling through goafs due to the phenomenon of complete leakage of drilling fluid will cause great interference in drilling control and even lead to drilling accidents. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for avoiding drilling accidents and ensuring the safety of the drilling process through the lost section of the goaf. [0004] In order...

Claims

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Application Information

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IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 倪建明郑士田胡杰王宇航王建文赵少磊
Owner HUAIBEI MINING IND
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