Coal mine underground hydraulic fracturing remote continuous pump post-high pressure sand adding system and method thereof

Abstract

A coal mine underground hydraulic fracturing remote continuous pump high-pressure sanding system and method thereof, comprising a sanding system, a fracturing pumping system and a remote measurement and control system, the fracturing pumping system includes a fracturing pump set and a high-pressure post-pumping system pipeline, one end of the high-pressure pipeline behind the pump is connected to the outlet of the fracturing pump group, and the other end is connected to the fracturing pipeline in the hole, the high-pressure pipeline behind the pump is connected to the sand adding system, and the sand adding system and the fracturing pump The transmission system is connected to the remote measurement and control system to realize remote control; thus, the present invention aims at the pump wear, small amount of sand added at one time, long interval time of sand added, hidden safety hazards in high pressure operation, etc. The problem is that the sanding process at the pump outlet can avoid wear and tear on the pump, and there is no need to modify the existing downhole fracturing pump. Through remote measurement and control, the sand filling process is guaranteed to be continuous, while avoiding safety hazards in high-pressure operations.

Description

technical field [0001] The invention relates to the technical field of underground gas drainage and production increase in coal mines, in particular to a high-pressure sand adding system and method thereof after a remote continuous pump for hydraulic fracturing in underground coal mines. Background technique [0002] Gas prevention and control is the top priority of coal mine safety production work. my country's "Provisional Provisions on Standardization of Coal Mine Gas Drainage" requires that the coal seam that should be subjected to gas drainage must be drained first, and the mining operation can only be arranged after the drainage effect meets the standard requirements, that is, "draining first and then mining, and the drainage reaches the standard." At the same time, it is required that gas drainage in coal mines should be "exhausted as much as possible, and multiple measures should be taken at the same time". [0003] There are two main methods of gas extraction in co...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a remote continuous pump high-pressure sanding system and method for underground hydraulic fracturing in coal mines, aiming at pump wear, less sanding at one time, and long sanding intervals in existing downhole fracturing devices and processes , high-pressure operation and potential safety hazards, etc., the pump outlet end sand filling process can avoid wear and tear on the pump, and there is no need to modify the existing downhole fracturing pump

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