A study on unsteady seepage field of fractured horizontal well in tight gas reservoir

Based on geologic and development characteristics of tight gas reservoir, a tight gas reservoir/fractured horizontal wellbore coupling model at unsteady state is derived by Green functions and Newman product principle, and the analytical solutions of dimensionless velocity and dimensionless pressure are obtained as well. Practical calculation example shows that main seepage of a fractured horizontal well surrounds the artificial fractures. When more fractures are fractured, the shapes of isobars from inner to outer are: families of conjugate ellipses, bone-shaped curves and a family of ellipses. According to the seepage law, effective technological measures of drilling and producing are given in the paper.