Casing Isolation Stratum Fracture Zone Method for Mine Underground Exploration and Release of High Pressure Karst Water Drilling Construction

Abstract

The invention discloses a sleeve tube isolating layer shuttered zone method of down hole detecting and placing high pressure karst water drilling construction for mine. The sleeve tube isolating layer shuttered zone method of down hole detecting and placing high pressure karst water drilling construction for the mine comprises the following steps: a first layer sleeve tube (6) is descended, a second section hole diameter is constructed, when a layer shuttered zone is encountered in the process of drilling, a slip casting method is not adopted, a key sleeve tube (5) is descended between the first layer sleeve tube (6) and the second layer sleeve tube (3), cement paste isolation and seal are conducted after the key sleeve tube (5) is descended, a pressure-tight test is conducted by casing a hole, if the result is qualified, drilling construction of a third section hole diameter is conducted, and a second layer sleeve tube (3) is descended in. Due to the fact that methods of dripping an extra sleeve tube and increasing an open hole orifice diameter are adopted, problem of encountering the layer shuttered zone in the process of detecting high pressure karst water in down hole roadway construction is solved, construction period is not delayed, cost is low, and long term and stable drilling can be ensured.

Description

Technical field [0001] The invention relates to a method for casing isolation stratum fractured zone for underground exploration and discharge of high-pressure karst water drilling construction. Background technique [0002] Deep mining faces the environment of high ground stress, high ground temperature and high osmotic pressure. The water pressure of the deep coal seam floor aquifer even exceeds 10 MPa, which is an ultra-high water pressure value. The basic work of preventing and controlling deep high-pressure water is to explore its hydrogeological conditions, and the main method is drilling exploration. The construction ground exploration holes are complex and costly to penetrate the strata, while the underground exploration boreholes are artesian wells, and the drilling reveals the hydrogeological information is intuitive and the drilling stroke is short. Therefore, most of the mines that are transferred to deep mining use underground roadway construction with high pressure ...

AI Technical Summary

Problems solved by technology

Construction ground exploration holes are complex and costly to pass through strata, and underground exploration drilling holes are artesian wells, which reveal hydrogeological information intuitively and the drilling stroke is short, so most of the mines transferred to deep mining use underground roadways to construct high-pressure karst water Detect boreholes and conduct dynamic observation of groundwater

[0003] When using the underground roadway for drilling construction, the drilling stroke is short (30-200m), and the formation fracture zone is often crossed during the drilling construction. Since the casing is finally fixed as a long-term hydrogeological observation hole, the local Fragmentation is not conducive to the fixing of the casing and the long-term use of the borehole; and in the drilling construction process using the existing technology, the local fragmentation of the formation often causes accidents such as hole collapse and buried drilling

[0004] Under normal conditions (without stratum fragmentation), the construction can be completed by lowering two layers of casing (the orifice pipe is lowered first, that is, the first layer of casing, and then the second layer of casing is lowered to the top of the target aquifer), but if When the ground is broken and the hole is seriously collapsed, the current method is grouting. After the grouting is used to seal the broken ground, the construction can be completed with two layers of casing. not necessarily obvious

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