Deep drill hole drilling technology under high-pressure-bearing underground water condition

Abstract

The invention discloses a deep drill hole drilling technology under the high-pressure-bearing underground water condition. During deep drill hole drilling, when a high-pressure-bearing fracture waterstratum with the water burst amount being 120 m<3> / h or more and the orifice water pressure being 1.90 MPa or more at the water burst point is met, and drilling is constructed to at least 35 m away from the water burst point of the high-pressure-bearing fracture water stratum, a method comprising the steps of 1 adjusting a drilling tool, 2 adjusting drilling fluid, 3 staggering the drilling progress and 4 performing advanced water exploring is adopted, and alternate grouting is performed through different drill holes. For solving the water burst problem of a ground lead-zinc ore 112 line interior shaft pre-grouting drilling, the key technology of combining drill assembly weighting, slip specific gravity adjusting, drilling progress staggering and clay and cement paste alternate grouting isadopted for performing experiment feasibility study, due to elaborate organization and scientific management, the drill hole water burst problem is effectively controlled, the comprehensive measure effect is good, meanwhile, it is ensured that drill holes are drilled smoothly, and safe and efficient production is achieved.

Description

technical field [0001] The invention relates to the technical field of mine survey and mine construction. Specifically, it is a deep borehole drilling technology under the condition of high pressure groundwater. Background technique [0002] In mine exploration, mine construction and various other drilling projects, when high pressure groundwater is encountered in the strata drilled through, the water inflow is often relatively large. When the water inflow is greater than the drainage capacity of the pump, it will cause well flooding. Accidents occur, resulting in the scrapping of the borehole; especially when the borehole is drilled into a formation with a high probability of karst caves, large cracks, fault fracture zones, and fine cracks and pores, sudden water gushing and water pressure may occur. Very large, when the water inflow is often greater than the drainage capacity of the water pump at this time, the accident of well flooding will occur and the borehole will be...

AI Technical Summary

Problems solved by technology

[0002] In mine exploration, mine construction and various other drilling projects, when high pressure groundwater is encountered in the strata drilled through, the water inflow is often relatively large. When the water inflow is greater than the drainage capacity of the pump, it will cause well flooding. Accidents occur, resulting in the scrapping of the borehole; especially when the borehole is drilled into a formation with a high probability of karst caves, large cracks, fault fracture zones, and fine cracks and pores, sudden water gushing and water pressure may occur. At this time, when the water inflow is often greater than the drainage capacity of the pump, it will cause a well flooding accident and cause the borehole to be completely abandoned.

[0003] Regardless of mine exploration or mine construction, the scrapping of drilling holes will seriously affect the work progress, and at the same time will cause a significant increase in mine exploration costs or mine construction; especially in mine construction, the engineering volume of shaft shafts only accounts for less than 10% of the total mine engineering volume. %, but its construction period accounts for 30%-40% of the entire mine. It is the "throat" project of mine construction. Improving the construction speed of shaft shafts is the key to speeding up mine construction

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