Coal field drill hole leak blocking system

Abstract

The invention relates to a coal field drill hole leak blocking system, belonging to the technical field of coal field drill holes. The coal field drill hole leak blocking system comprises an infusion system, a drill pipe connection system and a slurry system, wherein the infusion system comprises a infusion pipe, a check valve, a pipe boot, an infusion bottom hole, an infusion round hole, and a first level piston and a second level piston arranged in the infusion pipe from the bottom up; the drill pipe connection system comprises a drill pipe joint, a jump ring, an expansion sleeve sleeved and wound on the groove of the drill pipe joint, and a punching hole arranged at the groove on the middle part of the drill pipe joint; and the slurry system comprises insulating liquid and leak blocking liquid. The coal field drill hole leak blocking system has the advantages that the insulating liquid and the leak blocking liquid are injected at different periods for blocking holes, fractures and cracks on the rock body of the drill hole wall when an organic polymer film is formed on the wall of the drill hole, so that the leak blocking effect is improved; the expansion sleeve expands to tightly attach with the wall of the drill hole under the effect of slurry pressure to form an effective blocking space so as to be beneficial to the directional flowing of the insulating liquid and the leak blocking liquid. The system has the advantages of simple structure, convenience for operation ad low engineering cost.

Description

technical field [0001] The invention relates to a plugging system, in particular to a coal field drilling plugging system, which belongs to the technical field of coal field drilling. Background technique [0002] Drilling loss is one of the most serious and costly in-hole accidents in drilling engineering. Once drilling loss occurs, it will seriously affect the drilling efficiency, lead to an increase in drilling costs, seriously affect the construction progress and quality, and prolong the drilling time. Construction period. At present, cement slurry, chemical slurry, and inert materials commonly used in coal field drilling are put into the ground or pumped in to implement plugging. However, when the plugging materials do not play a role, they are washed away by groundwater. Therefore, traditional plugging devices It is not suitable for complex leakage formations such as multi-level leakage formations with high groundwater levels. Contents of the invention [0003] In ...

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Problems solved by technology

[0002] Drilling loss is one of the most serious and costly in-hole accidents in drilling engineering. Once drilling loss occurs, it will seriously affect the drilling efficiency, lead to an increase in drilling costs, seriously affect the construction progress and quality, and prolong the drilling time. Construction period

At present, cement slurry, chemical slurry, and inert materials commonly used in coal field drilling are put into the ground or pumped in to implement plugging. However, when the plugging materials do not play a role, they are washed away by groundwater. Therefore, traditional plugging devices and plugging technology are not suitable for complex leakage formations such as multi-level leakage formations with high groundwater levels

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