Southwest Petroleum University

Jie Lai

Chi Chen

Jianchun Guo

Cong Lu

Bo Gou

Kun Wang

Jichuan Ren

Shouxin Wang

Bo Yang

Tao Zhang

Xiao Li

Yuxuan Liu

Zhihong Zhao

Ye Zhong

Yuhang Zhao

Xiang Bai

Xinghao Gou

The present invention discloses a novel high-temperature visual acid etching test device and method; the test device includes a visual rock slab holder, an acid solution storage tank I, an acid solution storage tank II, a heating apparatus, a high-pressure water pump, a low-pressure acid pump, a back-pressure valve, an acid valve A, an acid valve B, an acid valve C, an acid valve D, an acid valve E, an acid valve F, a water valve G, a water valve H, a water valve I, a water valve J, and a water valve K; both the acid solution storage tank I and the acid solution storage tank II are provided with a piston therein, where the acid solution storage tank is divided into upper and lower independent parts by the piston. According to the present invention, the flowing process of an acid solution in a fracture can be directly observed to accurately characterize the distribution of the acid solution in the fracture, which facilitates a study on an acid etching mechanism. According to the present invention, an acid solution injection system is separated from a water injection system, so that only water is injected into the system through a high-pressure pump, effectively solving safety problems of acid solution pumping. In the test process of the present invention, a totally-enclosed acid solution system can ensure that the acid solution does not overflow at high temperature and high pressure, thus greatly increasing the safety of the test.

High-temperature visual acid etching experimental device and method

The invention discloses a method for experimentally determining the conductivity of an unpropped fracture in hydraulic fracturing of a shale reservoir, comprising: select an outcrop sample with a natural fracture in the shale reservoir, and cut the outcrop sample with along the extension direction of the natural fracture into no less than eight square rock slabs; use a laser scanner to obtain the rough topography data of the fracture surface of each square rock slab and calculate the area tortuosity; pick out the rock samples; model the rough surface of the selected rock samples; import the treated surface model into the engraving machine, and select the downhole core or outcrop rocks in the same horizon for repeated production; calculate the shear slippage at different positions of unpropped fracture according to the data of the shale reservoir; finally test the conductivity of the shale rock samples after shear slip.

Method for experimentally determining the conductivity of unpropped fracture in hydraulic fracturing of shale reservoir

The present invention discloses a method for experimentally determining the conductivity distribution of an acid-fractured fracture a carbonate rock oil and gas reservoir, including the following steps: by an acid fracturing simulator FracproPT, simulating and acquiring distribution data of fracture width, fracture height, temperature and acid liquor mass concentration in a hydraulic fracture length direction; selecting fracture width, fracture height and temperature data of total 10 feature points with the acid liquor mass concentrations being from 100% to 10% of the initial mass concentration; converting site acid injection displacement into laboratory acid injection displacement; preparing experimental acid liquor according to the acid liquor mass concentration data of the 10 feature points; and simulating the acid etching process, and experimentally testing the conductivity under the condition of reservoir closed pressure, and drawing a distribution diagram of the acid-etched fracture conductivity in the fracture length direction under the reservoir condition.

Method for experimentally determining conductivity distribution of acid-fractured fracture of carbonate rock oil and gas reservoir

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Chengdu, China

Jie Lai