致密油藏混合水压裂实例

Examples of mixed water fracturing for competent oil reservoir

长Q油组为一套微喉道、特低孔、超低渗的致密储层,传导能力差,适合采用形成复杂裂缝网络的混合水压裂技术。岩石力学与地应力参数的测井数字处理ROCK系统计算了H22井长Q储层的岩石力学参数和脆性指数;采用三维油藏改造体积反演与预测软件通过正交化设计与拟合计算,优化了混合水压裂方案可获得较大的油藏改造体积。现场实施后,试油产量13.42 t/d,是常规交联液压裂的2.07倍,增产效果明显,已经成为长庆油田长Q致密油藏的主体压裂技术。

The Chang Q oil formation is a set of competent reservoir with micro-throat, ultra-low porosity and ultra-low perme-ability, has poor conductivity and is suitable for developing mixed water fracturing technique for complex fracture networks. The ROCK system, which processes the logging data of rock mechanics and geostress parameters, computed the rock mechanics parameters and brittleness index of Chang Q reservoir in Well H22. With 3D reservoir reform volume inversion and forecast software, and using or-thogonal design and iftting calculation, the optimized mixed water fracturing method was able to realize larger reform volume. After site implementation, the test oil production was 13.42 t/d, which is as 2.07 times as that of normal cross linking lfuid fracturing. The produc-tion increase is remarkable. Now it has become the major fracturing technique for Chang Q tight oil reservoir in Changqing Oilifeld.