Method for preventing casing pipe from being fractured in underground well new construction hydrological drilling

An anti-fracture and casing technology, applied in drill pipe, casing, drill pipe, etc., can solve problems such as difficulty in treatment and danger, and achieve the effect of convenient operation and prevention of fracture.

Active Publication Date: 2019-12-24
CHINA UNIV OF MINING & TECH
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  • Method for preventing casing pipe from being fractured in underground well new construction hydrological drilling
  • Method for preventing casing pipe from being fractured in underground well new construction hydrological drilling

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[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] like Figure 1 to Figure 2 As shown in the figure, a method for preventing casing breakage of newly constructed hydrological boreholes in a well: specifically includes the following steps:

[0030] 1) Make anti-fracture casing. If the water pressure of the target aquifer to be observed is greater than 3.0MPa, according to the "Coal Mine Safety Regulations", the designed casing length should be greater than 20m, and the effectiv...

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Abstract

The invention discloses a method for preventing casing pipe from being fractured in underground well new construction hydrological drilling. The method comprises the following specific steps of anti-fracture casing pipe manufacturing, drilling, anti-fracture casing pipe lowering, anti-fracture casing pipe grouting, in-situ sweep hole drilling, performing casing pipe pressure withstand testing, andhigh-pressure blowout prevention valve installing at an orifice after the pressure withstand testing reaches a design requirement, wherein a drill bit is drilled and extended to a final hole depth through in-situ trepanning, and the anti-fracture casting pipe is provided with a short section plastic pipe and a long section plastic pipe. According to the method, a mode that a conventional steel casing pipe and a hole wall surrounding rock is separated in a large deformation section of the surrounding rock is adopted, when the surrounding rock occurs large-amplitude transformation fracture, theconventional steel casing pipe is not affected; and the method is convenient to operate, and can effectively prevent the fracture problem of the hydrological drilling anti-fracture casing pipe undera coal mine.

Description

technical field [0001] The invention relates to the field of coal mine safety, in particular to a method for preventing casing breakage in a new underground hydrological drilling hole. Background technique [0002] The water level data of main aquifers in coal mines are mainly obtained in real time through hydrological observation holes. In the North China coalfield, the mine is mainly threatened by the water damage of the Ordovician limestone aquifer. Multiple Ordovician limestone hydrological observation holes are often constructed underground in the mine, and the hydrological observation holes are generally constructed vertically. Safety evaluation of related mining. Such observation holes are installed with casings made of long steel pipes in accordance with the "Coal Mine Safety Regulations". During construction, a high-pressure blowout preventer must be installed at the orifice to prevent the high-pressure and large-flow water from drilling down the drilling rig. Afte...

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Application Information

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IPC IPC(8): E21B17/00E21B33/13
CPCE21B17/00E21B33/13
Inventor 钱自卫朱术云孙强姜春露张蕊黄震梁德贤张卫强
Owner CHINA UNIV OF MINING & TECH
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