A new method for calculating single-point productivity equation coefficient α in heterogeneous gas reservoir

3rd International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Lei, He^1,2 ; Yifei, Lan^1,2 ; Yingzhong, Yuan^3 ; Shan, Xie^1,2 ; Liangrong, You^1,2 ; Qinglin, Ai^1,2

National Engineering Laboratory for Low-Permeability Petroleum Exploration and Development, Petro China, Xian, Shanxi

710021, China^1

Research Institute of Exploration and Development, Changqing Oilfield Company, Petro China, Xian , Shanxi

710021, China^2

Chongqing Key Laboratory of Complex Oil and Gas Fields Exploration and Development, Chongqing University of Science and Technology, Shapingba, Chongqing

401331, China^3

关键词: Application prospect;    Computational accuracy;    Empirical formulas;    Gas reservoir;    Linear relationships;    Productivity equation;    Reservoir physical property;    Single point;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/61/1/012035/pdf
DOI  :  10.1088/1755-1315/61/1/012035

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Single-point test is mainly based on quantitative statistics of productivity well testing data to obtain average α value of gas fields or blocks, then corresponding single-point productivity equation can be obtained. However, for heterogeneous gas reservoir in Ordos Basin, because of the influences of reservoir physical property and test data, there are relatively big error between calculated average α value of gas field and actual α value of single gas well, which results in application of single-point empirical formula is limited. Through derivation of binomial productivity equation in this paper, it is found that there are good linear relationship between α and reciprocal of the square of pressure 1/pR2. Combined with actual test data of Jingbian gas field, the empirical formula between α and 1/pR2for 20 gas wells is got through regression analysis. The results indicate that new method greatly improves computational accuracy for absolute open flow of gas wells, which has good application prospect in similar gas field.