Well testing on fractured horizontal well with different dip angles
FAN Dong-yan, YAO Jun, WANG Zi-sheng, ZHANG Gui-ling (College of Petroleum Engineering,China University of Petroleum, Qingdao 266555, China)
Based on source function theory, the formulas to compute the pressure of fractured horizontal well with different dip angles were established through the method of images and superposition principle, and the solutions of bottom pressure with consideration of effects of wellbore storage and skin factor were obtained by means of Laplace transform andStehfest numerical Inversion. The effect factors of bottom-hole pressure were studied, the results show that the pressure performance influenced by different dip angles mainly appears at the transition period from first linear flow to radial flow in the isotropic formation. While in the condition of anisotropic formation, there is an influence during early-time flow period, that the bigger dip angles are, the higher differential pressure with constant production needs, and the pressure difference change increases with the growth of dip angle. The penetration degree of crack in the layer only influence the emerging time of flow behaviors, and the penetration deeper is, the later the corresponding behaviors appear. The first radial flow appears only when the fracture interspacing achieves some extent, and the larger the space is, the first radial flow lasts longer.