| Complicated fault-block reservoir is an important kind in development of Chinese oil field. Geology of this kind of reservoir is extremely complex. Currently, most complicated fault-block reservoir has been entered the higher water cut. Because of the complexity of this kind of reservoir, development level and degree has a larger gap compared with the fully equipped sandstone reservoir. Complicated fault-block reservoir has large potential in improving further oil recovery. Therefore, the study of technology policy of complicated fault-block reservoir has very important significance for the development of such reservoirs.Based on the percolation theory, productivity formula for totally closed and semi closed block reservoir with one oil well is obtained, and infiltrating law of fault block reservoir is studied. The results show that: For the completely closed fault block reservoir: The closer oil well is from the center, the more like a circular block shape is, the greater the production of pressure is, the smaller the block size is, then the greater the oil production capacity is; for semi closed block reservoir: the smaller the block size is, the smaller the length of the direction of water is, the closer oil well away from the water edge, the closer to the middle of two parallel faults, then the larger oil production capacity is.Using reservoir engineering and reservoir simulation methods, for fault-block reservoir of different sedimentation types, different side-water energy and different block forms, developing technology policy such as reasonable injection well pattern, well spacing, injection parameters are optimized. The results show that: For the distributary channel deposition reservoir, a staggered row of well pattern is applied, and well direction is perpendicular to the main river, for mouth bar reservoir with edge water, flooding from edge and the row of injection wells has the same direction with the edge water; reservoir of a narrow oily band and a strong edge water, water injection is not required, reservoir of a wider oily band and a weaker edge water, water injection from outside edge or on the edge is better; for semi-open fault-block reservoir with two fracture, injection mode from outside edge is applied with the well row direction is parallel to the fault, for triangular fault-block reservoir, center production and coner injection method should be adopted, for long- strip fault-block reservoir, well row is parallel to the short side. Finally, In case of River 100 fault block oil reservoir, adjustment for the program is obtained based on the research of the development model, and development index is forecasted, recovery ratio is increased 10.73 percent after 15 years, so practicality and effectiveness of the theoretical study is conducted. |
