Experimental device and method for simulating fracture development in high-temperature pyrolysis process of source rock

Abstract

The invention discloses an experimental device and method for simulating fracture development in a high-temperature pyrolysis process of a source rock, and relates to the fields of rock mechanics andpetroleum geology. The experimental device comprises: a hot pressure reaction device, a heating device, a pressurizing device, a fluid pressure control and product collection unit and an acoustic emission testing device, wherein the heating device comprises a box body, a heating element arranged in the box body and a thermocouple unit; the box body is used for loading the hot pressure reaction device; the pressurizing device is used for providing corresponding pressure to a lower pressure head, a lower end cover and a confining pressure head; the fluid pressure control and product collection unit comprises a fluid pressure controller that can be communicated with a second flow channel of theanan upper pressure head, a vacuum pump that can be communicated with the second flow channel of theupper pressure head, and a water pump communicated with a first flow channel of the lower pressure head; the acoustic emission testing device comprises a waveguide rod penetrating in a reaction kettle body and an acoustic emission testing probe connected with the waveguide rod. The device and method disclosed by the invention can simulate fracture development in thea high-temperature pyrolysis process of the source rock in a geological environment coupling a triaxial stress field withand a blowhole fluid pressure.

Description

technical field [0001] The invention relates to the fields of rock mechanics and petroleum geology, in particular to an experimental device and method for simulating crack development during high-temperature pyrolysis of hydrocarbon source rocks. Background technique [0002] Under the natural geological environment, the rock is generally in a stable state of triaxial compression and negative pressure of pore fluid, but with the increase of burial and formation temperature, the stress field changes, and it is caused by the pyrolysis of organic matter in the source rock. Changes in fluid pressure eventually lead to fractures in the rock where the stress field is unstable. Such fractures play an important role in oil and gas migration channels and storage spaces in oil and gas systems, and can greatly affect the spatial distribution and reserves of oil and gas. Through the study of the mechanical mechanism of fracture formation, the physical and mechanical property parameters...

AI Technical Summary

Problems solved by technology

This instrument realizes the conditions of high temperature and triaxial stress separate control, but it does not consider the dynamic pore fluid pressure generated and discharged by new fluid under geological conditions. Due to the large furnace body and samples, the four-channel acoustic emission detection system does not really Realize the detection of formation and distribution of high temperature fluid pressure cracks

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