Pulse hydraulic fracturing device and method based on continuous rotary valve

Abstract

The invention provides a pulse hydraulic fracturing device and method based on a continuous rotary valve. The pulse hydraulic fracturing device based on the continuous rotary valve is composed of a water tank, a water injection pipeline, a water pump, a pressure relief pipeline, the continuous rotary ball valve, a hydraulic motor and the like. According to the pulse hydraulic fracturing method based on the continuous rotary valve, stable pulse water pressure is generated in the water injection pipeline through periodical opening and closing of the continuous rotary ball valve, and a novel technical approach is provided for dynamic hydraulic fracturing of coal rocks. After the continuous rotary ball valve is connected into the water injection pipeline, a valve element of the continuous rotary ball valve is driven by the hydraulic motor to rotate, the valve is opened and closed continuously and stably, the periodical water hammer effect is formed in a water path injected into a coal rock body, and the pulse water pressure is generated; and the continuous rotary ball valve is improved, when the improved continuous rotary ball valve is closed, high-pressure water in the coal rock body can decrease the pressure actively, the vibration amplitude of the pulse water pressure is increased, and the technical effect of hydraulic fracturing is improved.

Description

technical field [0001] The invention relates to a pulsating hydraulic fracturing device and method, in particular to a continuous rotary valve pulsating hydraulic fracturing device and method suitable for fracturing coal and rock mass, and belongs to the technical field of coal mining. Background technique [0002] In recent years, hydraulic fracturing technology has received extensive attention in coal mines. The main reason is that this method can enlarge and extend the original fissures in the coal and rock body, or form new holes and fissures, promote the displacement of the rock mass, realize pressure relief and increase permeability in the coal seam, and thus can be used for gas drainage and stress distribution. Control and water injection weakening of coal and rock mass and other technical fields. [0003] Hydraulic fracturing is generally divided into ordinary hydraulic fracturing and pulse hydraulic fracturing. Ordinary hydraulic fracturing mainly uses high-pressu...

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Problems solved by technology

Ordinary hydraulic fracturing mainly uses high-pressure, high-flow water injection pumps to inject fracturing fluid into the target coal formation, which requires high pressure, and there are problems such as reduced fracture closure and conductivity, disordered fracture development, and poor fracturing controllability, etc. question

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