A method for preventing downhole hydrological drilling orifice pipe fracture
A technology of orifice pipe and hydrology, which is applied in the direction of drill pipe, drill pipe, drainage, etc., can solve the problem of hydrological drilling orifice pipe breakage, achieve wide operability and avoid breakage
Active Publication Date: 2020-09-15
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0005] In order to solve the problem that the hydrological drilling orifice pipe used in the underground is broken due to the deformation of the surrounding rock, the present invention provides a method for preventing the fracture of the hydrological drilling orifice pipe in the well
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[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] in the prior art figure 1 It shows that the traditional orifice pipe 4 and the surrounding rock 1 are fixed through the grout stone body 5 . In order to solve the fracture of the orifice pipe 4, the present invention discloses a method for preventing the fracture of the orifice pipe of the downhole hydrological drilling, which includes: the aquifer 2, the surrounding rock 1 above the aquifer 2, and the penetrating and fixed An orifice pipe 4 in the surrounding rock 1 and fixed by a slurry concretion body 5 . Generally, if there are valves, water level monitoring equipment, etc. at the upper bare opening of the orifice pipe 4, they need to be removed, and only the upper bare opening of the orifice pipe 4 is reserved. Implementation of the present invention also includes the following steps:
[0022] In step a, first in the pl...
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The invention discloses a method for preventing an underground hydrological borehole orifice pipe from being broken. The underground hydrological borehole orifice pipe comprises a water-containing layer, surrounding rock and an orifice pipe body. The method for preventing the underground hydrological borehole orifice pipe from being broken comprises the following steps: a. monitoring whether a water outlet amount of the orifice pipe body under an open condition is greater than 20m<3> / h or not; if not, executing step c; or else, executing step b; b. if the water amount is greater than 20m<3> / h,fixing a mask with a pressure relief valve to an open free end of the orifice pipe body, enabling the water outlet amount of the orifice pipe body to be about 20m<3> / h, and then continuing the step c; c. cutting out an annular buffer ring hole with a depth H which is equal to the width of a roadway or a chamber where a hydrological borehole is located, around the orifice pipe body by virtue of atrepanning drill bit; and d. pouring a flexible buffer material into the drilled buffer ring hole until the interior of the buffer ring hole is fully poured. The method for preventing the undergroundhydrological borehole orifice pipe from being broken has the following beneficial effects: the annular buffer ring hole and the filled buffer material are utilized for eliminating the deformation of acircumferential rock layer of the hydrological borehole orifice pipe, so that the breakage of the orifice pipe body is avoided; and higher operability is achieved.
Description
technical field [0001] The invention relates to the field of industry and mining, in particular to a method for preventing fracture of an orifice pipe of an underground hydrological borehole. Background technique [0002] The water level of the main aquifer in the coal mine is obtained in real time mainly through the hydrological survey borehole. In my country's North China type coalfields, mines are mainly threatened by Austrian ash water hazards, and many long hydrological observation holes for Austrian ash water are often constructed underground in mines, and the safety evaluation of related mining is carried out through the water level data monitored by them. The orifice pipes made of long steel pipes are installed in accordance with the "Coal Mine Safety Regulations" during the construction of such long observation holes. For example, the "Coal Mine Safety Regulations" stipulates that when the water pressure of the aquifer is detected to be greater than 3MPa, the length...
Claims
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IPC IPC(8): E21B17/00E21B33/13E21F16/00
CPCE21B17/00E21B33/13E21F16/00
Inventor 钱自卫胡东祥郭建伟王伟蔡逢华朱术云
Owner CHINA UNIV OF MINING & TECH