The Foundation and Application of Horizontal Well Deliverability Type Curves

As a development technique to improve oil and gas deliverability, horizontal wells have recently become an important technical support to develop low permeability or extra-low permeability and unconventional oil and gas fields. Therefore, it is quite necessary to carry out the analysis methods of horizontal well deliverability. Based on the point source function, this paper started with unsteady seepage, established the seepage physical models of horizontal well in the homogeneous reservoir with closed circular boundary, and derived the solution by using Lap lace transformation and Stehfest numerical inversion and so on, then drawn the deliverability decline curve. Furthermore, we have developed the type curves of horizontal well deliverability by using Blasingame analysis method, made an analysis of dynamic feature and achieved reservoir relevant parameters by using it to analyze actual horizontal well. Through the research results, it can be concluded: The deliverability decreases with time. When the pressure wave reaches the outer boundaries, the declining rate becomes faster, and achieves pseudo-steady flow. Blasingame curves also have a feature to be steady flow. We can evaluate single well dynamic reserves, outer boundary distance and permeability by matching.