Auxiliary circulatory chip returning device of production vertical well when the coalbed methane well generates radial hydraulically injection

Abstract

The embodiment of the invention discloses an auxiliary circulatory chip returning device of a production vertical well when the coalbed methane well generates radial hydraulically injection. The device comprises a sleeve tube, an operating oil tube and a tube column whipstock, wherein the upper end of the sleeve tube is provided with a water outlet which is communicated with a water exhaust device; the upper end of the operating oil tube is provided with a water inlet which is communicated with a water injecting device; and the lower guiding cambered surface part of the tube column whipstock is provided with a through hole. By arranging the through hole on the lower guiding cambered surface part of the tube column whipstock, the operating oil tube provided with the water inlet can penetrate through the tube column whipstock through the water flow injected by the water injecting device, and then enter the pocket of the production vertical well, and then the mixture of coal dust and water in the pocket can be effectively impacted, thereby avoiding the coal dust deposition.

Description

technical field [0001] The invention relates to the field of coalbed methane exploitation, more particularly, to an auxiliary circulation chip returning device used for drainage and production of vertical wells during radial hydraulic injection of coalbed methane wells. Background technique [0002] At present, in the field of coalbed methane exploitation, in the radial wellbore hydraulic injection construction, the pulverized coal flowing from the radial wellbore into the vertical well during the hydraulic injection process needs to be pumped out of the well in time; The process is called back cutting in the field of coalbed methane mining. [0003] However, in the prior art, the water entering the vertical well pocket is sprayed out of the radial wellbore in the target coal seam by implementing the radial hydraulic injection pipe string and carries the coal cuttings of the wellbore back into the vertical well pocket. The inner diameter of the coiled tubing is very small (...

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Problems solved by technology

[0003] However, in the prior art, the water that enters the vertical well pocket is injected into the radial wellbore in the target coal seam by implementing the radial hydraulic injection pipe string and carries the coal cuttings of the wellbore back into the vertical well pocket. The inner diameter of the coiled tubing is very small (generally 25mm), so the flow of water is very small. , since the cross-section of the annulus is much larger than that of the coiled tubing, the mixture of water and pulverized coal flows slowly in the annulus, and due to the slow flow of the mixture, it will form The deposition of pulverized coal, when the deposited pulverized coal reaches a certain height, it will block the lower end of the working oil pipe, causing the oil pipe to be stuck or the hydraulic jet cannot continue

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