Parameter Optimization for the Horizontal Wells in Bottom Water Reservoirs of Yan'an Formation

The applications of horizontal well technology in the bottom water reservoirs of Yanchang Oil Field are still at the stage of field test. Presently, the development effects of several horizontal wells in such reservoirs vary greatly. Various technical parameters of horizontal well are the key factors affecting the development effect. For improving the development result of the horizontal well, the range and the size of main technical parameters could be determined by quantitative analysis, many parameters for horizontal well development are optimized in terms of well pattern mode, length of horizontal section, vertical location of horizontal section, timing of water injection, rate prorafion between production and injection, and indicators comparison, etc. The effect is able to be expressed by the quantitative analysis of daily oil production, cumulative production, water cut, etc., and a scheme of optimal parameters is obtained by employing the numerical simulation method based on the reservoir geology study for block D4927, therefore providing a reference and basis for the high efficiency development of horizontal wells in bottom water reservoirs.