Southwest Petroleum University

Mingyong Zeng

Jianchun Guo

Tao N Zhang

Bo Gou

Xiao Li

Zhuang Liu

Hangyu Zhou

Li Zhan

Kun Sun

The present invention discloses a numerical simulation method for proppant transport considering wall-retardation effect, comprising the followings: establish a physical model of laboratory experiment on proppant transport with a large flat-panel device; establish a drag coefficient model considering wall-retardation effect according to the numerical simulation experiment; establish a computational geometric model; set boundary conditions and physical parameters of the geometric model according to the two-fluid simulation method for solid proppant quasi-fluidization; verify the grid independence of the computational geometric model to obtain the transport characteristics and placement pattern of the proppant in fractures. The present invention employs a numerical simulation method to study the migration and distribution patterns of proppant under the retardation effect of narrow walls during the hydraulic fracturing. The method is reliable in principle and can accurately predict proppant transport in subsurface hydraulic fractures with consideration of the wall-retardation effect on proppant transport.

Numerical simulation method for proppant transport considering wall-retardation effect

The present invention discloses a method for experimentally determining the influence of acid liquor on the Young modulus of compact carbonate rock. The method comprises the following steps: (1), selecting a standard core of compact carbonate rock for use, carrying out a uniaxial compressive strength experiment to establish an empirical relationship between the uniaxial compressive strength and the Young modulus of the compact carbonate rock; (2), selecting a full-diameter core in a target work area for use, carrying out a rock scratching experiment by using a rock scoring instrument, testing the compressive strength of the core, and acquiring the Young modulus of the core before acid treatment; (3), soaking the acid liquor and the core in a high-temperature and high-pressure reactor for a soaking reaction; and (4), carrying out a scratching experiment again on the core soaked with the acid liquor in the original scratching experiment position, testing the compressive strength of the core, acquiring the Young modulus of the core after acid treatment, and determining the influence of the acid liquor on the Young modulus of the compact carbonate rock. The method disclosed by the present invention is reliable in principle, and simple and convenient in operation. The influence of the acid liquor on the Young modulus of the compact carbonate rock under reservoir conditions is authentically evaluated, and the acid fracturing transformation effect of the compact carbonate rock is further improved.

Method for experimentally determining influence of acid liquor on Young's modulus of compact carbonate rock

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Sichuan, China

Mingyong Zeng