冀中凹陷高家堡地区异常破裂压力储层

Fracturing reformation techniques of reservoirs with abnormal breakdown pressure in Gaojiapu area of Jizhong sag

吕传炳 余东合

LV Chuanbing YU Donghe

中国石油大学，北京　102249 华北油田公司油藏评价部，河北任丘　062552

China University of Petroleum, Beijing 102249, China Huabei Oilfield Company, Renqiu 062552, China

针对冀中凹陷高家堡地区储层破裂压力异常高、压裂裂缝?、加砂难、易砂堵的特点，结合地层倾角测井资料、三轴岩石力学试验参数和室内kaiser地应力测试资料，从孔径、孔密、孔深、相位角、打开程度等参数进行了降低储层破裂压力的射孔优化设计，根据优化的射孔方案，配合多级段塞压裂工艺、20~40目和30~50目的中小粒径组合陶粒工艺、增大井底注液压力工艺措施，有效降低了冀中凹陷高家堡地区异常破裂压力储层的破裂压力，大大提升了该地区压裂改造的平均砂比和加砂规模。

The reservoir in Gaojiapu area features in abnormal breakdown pressure, narrow fracture, hard sand, and sand plug. Combined with the dip log data, triaxial rock mechanical test parameters, and lab Kaiser geostress testing data, optimal design of perforation aimed at reducing breakdown pressure is conducted by using such parameters as hole diameter, density, depth, phase angle, and penetration. According to the optimized perforation plan, by employing the multistage slug fracturing technology, the combined ceramsite technology with the small and medium grain size 20~40 meshes and 30~50 meshes, and the technology of increasing the bottom hole injection pressure, the breakdown pressure is reduced successfully, the average proppant concentration and sand size of the area are enhanced greatly.