Mining degradable hole washing liquid additive as well as preparation method and use method thereof

Abstract

The invention discloses a degradable hole washing liquid additive for mining as well as a preparation method and a use method thereof, the degradable hole washing liquid additive for mining comprises a tackifier, and the tackifier comprises nonionic cellulose ether particles, polyvinyl alcohol and a foam inhibitor according to a mass ratio of (0.8-1): (0.1-0.3): (0.01-0.05); the nonionic cellulose ether particles are prepared by granulating a 40-80% ethanol solution and nonionic cellulose ether, and the particle size is 50-100 meshes. A 40-80% ethanol solution and non-ionic cellulose ether which is not subjected to surface treatment are subjected to wetting, film forming, drying, crushing and screening to prepare the tackifier which can be quickly dispersed-dissolved to form a gel system with stable viscosity. And coal powder, coal cinder and coal slime in the drill hole can be well carried and the drill hole can be cleaned by utilizing a stable gel system of the drilling fluid.

Description

technical field [0001] The invention belongs to the field of drilling gas extraction, in particular to a degradable hole washing liquid additive for mining and a preparation method and a use method thereof. Background technique [0002] Main engineering methods for gas disaster prevention and coalbed methane resource development in underground coal mines. During the formation of low-angle drilling, due to the influence of gravity, it is difficult to discharge the coal slag in the hole smoothly, resulting in the deposition of coal slime in the drilling, which in turn affects the quality of gas drainage, especially during the construction of negative-angle drilling, the more obvious. The flushing fluid for coal seam gas extraction drilling is different from the flushing fluid for oil drilling. The former requires that the flushing fluid cannot affect the drilling gas drainage, cannot reduce the permeability of the coal seam, and cannot block the gas desorption channel. At pr...

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Problems solved by technology

[0003] Based on the special scenario of borehole gas drainage, the current borehole flushing fluid mainly has the following problems: (1) The slag-carrying capacity of pure water and high-pressure gas is insufficient, especially the slag-carrying capacity of low-angle and long boreholes is weak, and it is difficult to realize (2) Although the low-viscosity drilling flushing fluid can play a certain role, it still cannot carry large cinders, while the high-viscosity drilling flushing fluid and emulsion can play a good role in carrying slag effect, but the flushing fluid will block the hole wall, and the flushing fluid discharged from the borehole will not be degraded in time, which will pollute the downhole construction environment; (3) The flushing fluid remaining in the borehole will damage the drill Gas gushes out and pollutes the drilling environment; (4) The flushing fluid based on CMC materials needs to be prepared in advance, and the delayed-dissolution cellulose ether is difficult to immediately form a stable low-viscosity flushing fluid, which affects the use effect

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