Southwest Petroleum University

Jian Zheng

Yulong Zhao

Ruihan Zhang

Qian Li

Tao Zhang

Bo Hu

Jianfa Wu

Feng Ge

Hongsha Xiao

Deliang Zhang

Hongxi Li

Disclosed are a device and method for determining gas diffusion coefficient in rocks. The device includes: a core holder, a sampling mechanism, a gas analyzer, a gas source and a pressure gauge. A middle part of the core holder holds a rock sample, two sampling mechanisms are symmetrically arranged at two ends of the rock sample, each sampling mechanism includes a first blind tube, a cylinder, a second blind tube and a sampling cavity, an open end of the first blind tube faces the rock sample and is in sealing connection with an end surface of the rock sample to form a diffusion chamber. A single sampling cavity is isolated from the diffusion chamber, and the pressure of the diffusion chamber is not affected, so that undisturbed sampling is achieved, the influence on the pressure of the diffusion chamber is reduced, and the accuracy of the determination results is improved.

Device and method for determining gas diffusion coefficient in rocks

The invention discloses a full wellbore pressure calculation method, device and computer-readable storage medium for fracturing horizontal wells, includes steps: collect basic parameters, establish fully implicit numerical model of formation flow; solve the full implicit numerical model under an inner boundary condition of a constant gas production rate; calculate wellbore pressure change of each fracturing section of horizontal well; calculate the bottom-hole pressure of each fracture initiation point; repeat steps until the variables converge, the bottom-hole flow pressure and the bottom-hole pressure at each fracture initiation point are obtained at this time step; the wellbore pressure and wellhead casing pressure are calculated at this time step. The method is for predicting the variation law of full wellbore pressure and wellhead casing pressure by using production data in the absence of bottom-hole pressure test data, and has practical value for accurate prediction of production performance of gas reservoir fracturing horizontal wells.

Full wellbore pressure calculation method, device and computer readable storage medium for fracturing horizontal well

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Chengdu, China

Jian Zheng