Pulse wave reinforced hydraulic fracturing evaluation experimental device and method

Abstract

The invention discloses a pulse wave reinforced hydraulic fracturing evaluation experimental device and method, relates to the technical field of hydraulic fracturing, and solves the problems that thedamage degree of shock waves to shale and a fracturing crack causing mechanism are unknown, and the shock waves cannot be applied to the compact reservoir transformation. The pulse wave reinforced hydraulic fracturing evaluation experimental device and method are characterized in that a triaxial pressure experimental device comprises a sleeve, a shock wave generator and a power supply control cabinet; a rock sample is arranged in the sleeve; the shock wave generator is arranged in the rock sample; an upper base is arranged at the top end of the sleeve, and a lower base is arranged at the bottom end of the sleeve; a fluid conveying control device comprises a fracturing fluid tank, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline; an experimental parameter monitoring device comprises a data collection system, a flowmeter and a pressure sensor; the flowmeter is arranged on the third pipeline; and the pressure sensor is arranged on the fourth pipeline. The effect of simultaneously completing experiments of rock fracturing by shock waves, rock fracturing in different shock wave reinforced hydraulic fracturing modes, permeability tests before and after fracturing and the like can be achieved.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing, more specifically, it relates to a pulse wave enhanced hydraulic fracturing evaluation experimental device and method. Background technique [0002] With the demand for energy from social development and the advancement of oil and gas resource exploration and development technologies, tight reservoirs such as shale gas, coalbed methane, and tight oil and gas have gradually become the main force for increasing reserves and production of oil and gas resources in various countries. In order to achieve efficient development of tight reservoirs, It is usually necessary to increase the productivity of the reservoir through reservoir stimulation measures. [0003] At present, commonly used reservoir stimulation measures include hydraulic fracturing technology, acid fracturing technology, water injection development technology, high-energy gas fracturing technology, pulse-increased permeabil...

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Problems solved by technology

According to the change of pump pressure during on-site construction, conventional hydraulic fracturing relies on hydrostatic pressure to crack the reservoir to improve the seepage capacity of the reservoir. Conventional hydraulic fracturing has the disadvantages of large pumping volume and low energy utilization rate; and when the maximum and minimum ground stress difference in the vertical wellbore direction is large, hydraulic fracturing generally forms tree-like fractures, or even single fractures, which cannot reach to good volume fracturing effect

[0004] At present, the following problems still exist in the research and field application of shock wave enhanced hydraulic fracturing technology, which limit the application of this technology in tight reservoir stimulation:

[0005] 1. The damage degree of the shock wave to the strength characteristics of shale is unknown. If the impact of shock wave on the physical and mechanical parameters of shale is not considered, it is impossible to reveal the low crack initiation pressure and expansion resistance of shale fractures and the complexity of the fracture network during shock wave enhanced hydraulic fracturing High mechanism;

[0006] 2. The fracturing mechanism of shock wave enhanced hydraulic fracturing is unclear, and there is a lack of guiding theory and methods for determining the quantitative relationship between shock wave amplitude, frequency, frequency, pump pressure and other parameters, shale initiation pressure and expansion range;

[0007] 3. There must be some differences in the mechanism of action and the effect of increasing permeability of the three shock wave strengthening methods, but there are few reports on the comparative research of the three methods;

[0008] The basis of the research on the above mechanism is to carry out the necessary shock wave enhanced hydraulic fracturing experiments. At present, there is a lack of a set at home and abroad that can simultaneously complete shock wave fracturing of rocks, different shock wave enhanced hydraulic fracturing methods of rock fracturing, and permeability tests before and after fracturing. Shock wave enhanced hydraulic fracturing experimental system with other experimental contents

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