Examples of mixed water fracturing for competent oil reservoir

The Chang Q oil formation is a set of competent reservoir with micro-throat, ultra-low porosity and ultra-low permeability, 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 orthogonal design and fitting 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 fluid fracturing. The production increase is remarkable. Now it has become the major fracturing technique for Chang Q tight oil reservoir in Changqing Oilfield.