Simulating device for dynamic impact fracture of horizontal well

Abstract

The invention provides a simulating device for dynamic impact fracture of a horizontal well. The simulating device comprises a force transmitter, a driver, a connector and a core clamping device. Theforce transmitter comprises a cylindrical shell and a force transmitting column arranged in the shell; a driver is arranged at the first end of the force transmitter and used for pushing the force transmitting column to move relative to the shell; the connector is arranged at the second end of the force transmitter, and an inner cavity of the connector communicates with an inner cavity of the shell; and the core clamping device is arranged at the second end of the connector. According to the simulating device, pulse pressure can be formed so as to simulate the real state in a shaft, and accordingly the crack forms of rock fracturing at the long well section and the multilayer section of the horizontal well are simulated.

Description

technical field [0001] The invention relates to the reservoir transformation technology of unconventional oil and gas reservoirs such as shale gas and tight sandstone gas in the field of oil and gas field development, in particular to a simulation device for dynamic impact fracture of horizontal wells. Background technique [0002] Horizontal well pulse deflagration fracturing technology uses solid gunpowder as the energy source to produce fast and slow combustion reactions to form multi-stage pulse pressure. This pressure pulse impacts the formation around the perforation hole through the pressure relief hole of the fracturing gun, and forms a number of radial fractures in the oil and gas layers around the wellbore (the direction of the fracture is not affected by the in-situ stress). Repeated reconstruction, at the same time make the formation form a new uniform radial fracture network, maximize the conductivity of the fracture, eliminate the reservoir pollution near the w...

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Problems solved by technology

[0004] Although many scholars have carried out corresponding explorations on the dynamic rock fracture simulation experiment device for deflagration fracturing, the simulation test devices in the prior art are all aimed at vertical wells.

However, horizontal wells and vertical wells are different in wellbore structure. Horizontal wells have long deflagration fracturing intervals, and the rock stress state is also different from vertical wells. Therefore, the simulation device in the prior art is not conducive to the deflagration of rocks in the long section of horizontal wells. Fracturing simulates the cracking of rock

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