PROBLEMS CONCERNING THE PRODUCTIVITY CALCULATION OF HORIZONTAL WELL AND BRANCH HORIZONTAL WELL

By now, the scholars in China has put forward more than 10 formulas for calculating the productivity of horizontal well and branch horizontal well. All of them deduced and proved the validity of the formulas by use of different mathematics methods, and the formulas are very different due to the diverse hypothesis and boundary conditions. Thus, many incorrect conclusions have been observed. In order to let the reservoir engineers get the suitable models to carry through reservoir engineering calculation, this paper will clarify several problems and eliminate the chaos of formula application.