相位对斜井射孔破裂压力的影响

斜井破裂压力是压裂设计的一个重要参数，一般只能从已知射孔方位角来预测该参数。但现场采用的是非定向射孔，缺乏相应破裂压力的预测方法，而传统的破裂压力计算方法并没有获得非定向射孔井破裂压力的变化规律。为此，针对射孔斜井的主应力与射孔夹角未知的情况，利用应力分析及裂缝起裂机理，分析相位对斜井破裂压力的影响，并分析了多缝破裂压力的变化及破裂压力与裂缝延伸条数的关系。结果表明：当射孔方位角变化，各个射孔破裂压力交替地达到最大、最小值，在某个方位角，相应有多个破裂压力；其中最小破裂压力对应射孔处裂缝最先产生，通过优化射孔参数可降低裂缝起裂压力、优化裂缝延伸参数。这为优化压裂设计、降低施工风险及提高后期改造效果提供了依据。

Impact of phase angle on the breakdown pressure of deviated wellbore in perforating

The breakdown pressure of deviated wellbore, being an important parameter of the fracturing design in perforation, can only be forecasted with the known perforation phase angle. However, as non-oriented perforation is being used in oil and gas fields in recent years, the way for predicting the breakdown pressure has not been obtained, moreover, the conventional calculation methods for the breakdown pressure failed to achieve the variation law of breaking pressures in non-oriented perforation wells. In this ...