Southwest Petroleum University

Xian Peng

Xiaohua Tan

Qian Li

Tao Li

Fei Zhang

Xiaoping Li

Longxin Li

Zihan Zhao

Yulong Zhao

Yan Zhang

Lin Chen

Ruihan Zhang

Lu Liu

Yilong Li

Yongchao Wang

Honglin Lu

Zhenglin Mao

Lei Ding

Mingqing Kui

Yuchuan Zhu

Haoran Hu

Fu Hou

Miaofeng Cui

Daijin Zhuang

Xixiang Liu

Jiajia Shi

Jin Fang

Guowei Zhan

Shilin Huang

Hang Zhang

Jian Cao

Taixiong Qing

Lin Yuan

Dong Hui

Desheng Jiang

Qilin Liu

Heng Xiao

Xucheng Li

Yang Qing

Songcen Li

The present disclosure relates to a prediction method for constant production decline of a water-producing gas well in a highly heterogeneous reservoir. The prediction method mainly includes: collecting related data of a target water-producing gas well, fitting to obtain a water-drive constant and a water invasion constant, fitting dynamic reserves by adopting a Blasingame plotting method, conducting fitting by adopting a dual-medium model to obtain an elastic storativity ratio and an interporosity flow coefficient, calculating a reservoir heterogeneity coefficient, obtaining a flowing bottomhole pressure at the later stage of stable production, calculating formation pressure of a new day through quantitative production of the target water-producing gas well with 1 day as an iteration stride, performing iteration until the formation pressure is less than or equal to the formation pressure at the end of stable production, and drawing a prediction curve about constant production decline of the target water-producing gas well.

Prediction method for constant production decline of water-producing gas well in highly heterogeneous reservoir

The present disclosure provides a method for predicting a water invasion frontier for a complex well in a bottom-water gas reservoir. The technical solution is as follows: with consideration of forms of different well types and a gravitational pressure drop in production, a coupled permeability of a corresponding well type acting on a gas-water interface under the action of a baffle plate is expressed by using an equivalent percolation resistance method; a productivity of each infinitesimal section of the corresponding well type is calculated; a position of the gas-water interface is calculated with an equivalent permeability and a pseudo-productivity as characteristic parameters; water breakthrough is determined when there is a point over a water avoidance height, and a change in water invasion frontier form may be expressed with water quality point position data at this time.

Method for predicting water invasion frontier for complex well in bottom-water gas reservoir

The present disclosure relates to a method for predicting an amount of water-sealed gas in a high-sulfur water-bearing gas reservoir. The method solves the problem that no method has yet been proposed for predicting the amount of water-sealed gas in a high-sulfur water-bearing gas reservoir. According to the technical solution, the method includes: considering that the volume of the gas reservoir does not change during the production of the constant-volume gas reservoir, deriving, based on a material balance method, a material balance equation of the high-sulfur water-bearing gas reservoir in consideration of water-sealed gas and water-soluble gas, solving and drawing a chart of water-sealed gas in the high-sulfur water-bearing gas reservoir by an iterative algorithm, obtaining a recovery factor of the high-sulfur water-bearing gas reservoir in consideration of water-sealed gas and water-soluble gas, and further obtaining the amount of water-seal gas in the high-sulfur water-bearing gas reservoir.

Method for predicting amount of water-sealed gas in high-sulfur water-bearing gas reservoir

An apparatus for evaluating a dried crystal error in a COdrying experiment comprises a heating jacket, a visual container, a weighing device, a transparent cover, a control apparatus, a vacuum pump, a damping table and a heating apparatus, and can accurately dry and weigh a rock sample subjected to a carbon dioxide drying effect experiment in the visual container, so that the crystal error caused by evaporation of a solution in the rock sample in the process is calculated. This apparatus provided by the present invention has high precision and simple operation, can well evaluate the crystal error caused by the saline solution retaining in the rock sample when the rock sample is directly dried in the carbon dioxide drying effect experiment, and can correct the results of the carbon dioxide drying effect experiment compared with the prior art, thereby obtaining accurate experiment results.

Apparatus for evaluating dried crystal error in COdrying experiment and use method thereof

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Chengdu, China

Xian Peng