Shale gas well simulated reservoir fracture fracturing liquid flowback rate experimental measurement device and method

Abstract

The invention discloses a shale gas well simulated reservoir fracture fracturing liquid flowback rate experimental measurement device and method. The shale gas well simulated reservoir fracture fracturing liquid flowback rate experimental measurement device comprises a clamp, a press machine, a thermostat, a constant-speed and constant-pressure pump, an intermediate container, a constant-speed andconstant-pressure pump outlet valve, a fluid inlet valve, a fluid outlet valve, a nitrogen cylinder outlet valve, a nitrogen cylinder and an outlet valve. The method mainly comprises the steps of 1)rock sample preparation, 2) shale physical property parameter testing, 3) testing parameter calculation, 4) fracturing liquid preparation and density testing, 5) testing parameter testing, and 6) shale flowback rate calculation. The shale gas well simulated reservoir fracture fracturing liquid flowback rate experimental measurement device takes into comprehensive consideration the influence of stratum temperature, stratum stress and fluid pressure on shale flowback rate and quantifies influence factors to reflect the shale flowback rate under real stratum conditions and accordingly to providea theoretical basis for shale flowback scheme optimization.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas development, in particular to an experimental testing device and method for the flowback rate of fracturing fluid after volume fracturing of shale gas wells in the shale hydraulic fracturing process. Background technique [0002] As an important part of unconventional oil and gas resources, shale gas has been widely valued and developed due to its huge resources and clean characteristics of energy. Due to the characteristics of high brittleness, poor permeability, and natural micro-fractures in reservoirs, the large-scale multi-stage volumetric fracturing technology of horizontal wells has become a commonly used development method for the economical and effective development of unconventional oil and gas reservoirs such as shale gas. In the process of hydraulic fracturing in shale gas reservoirs, tens of thousands of square meters of fracturing fluid are injected into the reservoir, but th...

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Problems solved by technology

This method takes into account the influence of displacement pressure difference and formation confining pressure on the flowback rate by using the flowback device, but the flowback in this experiment is carried out after the spontaneous imbibition of rock samples, without simulating the real self-imbibition and flowback of shale. The dynamic process of flowback, while the formation temperature is not considered

[0006] The above three methods do not comprehensively consider the effects of formation temperature, formation stress, fluid pressure and other factors on the flowback rate of shale. At present, there is no method to simultaneously consider these factors and quantitatively characterize them. Therefore, it is necessary to study the influence of shale in real formation conditions. The test method of lower flowback rate provides a theoretical basis for the optimization of shale flowback system

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