考虑地应力影响下的射孔初始方位角的确定

根据射孔井段第一个射孔与射孔井段地应力主方向之间的位置关系定义了射孔初始方位角,从射孔孔深受地层强度和密度影响的角度出发,按最大穿透深度假设,根据射孔井段井壁应力分布情况,定量地分析了地应力方向、射孔数、射孔相位对射孔穿深的综合影响,定义了最佳应力系数和最差应力系数。并结合实际情况给出了计算方法和算例。

INITIAL PERFORATING AZIMUTH ANGLE CONSIDERING STRESS OF STRATUM

Presently,there is no concept of perforating azimuth angle in perforating design and perforating practice. But,perforating depth of shot will decrease along with increase of intensity and density of stratum,furthermore,stratum resistance to shot will increase following as increasing of intensity and density of rock according as theory of shock wave. At same times,as we know,distributing of stress of stratum around wall of a well is difference due to difference of magnitude and direction of tectonic stress. So,we can educe that perforating azimuth angle has an import effect on actual perforating depth of shot. The author primarily probe into choosing of optimal perforating azimuth angle in the light of distributing status of stress around well in perforating depth,define the best stress coefficient and worst stress coefficient.