Bedded, High Permeability Reservoirs With Bottom Water Optimization Control Study

It's a special kind of bottom-water oil reservoir with thin-bedded, low-amplitude and high-permeability. This kind of reservoir is first discovered in cretaceous, Klh2 group stratum in Luliang area, Kelamayi field, Xinjiang province on June 2000. Campared with normal typical bottom-water reservoir with thick water and oil layers, this kind of reservoir has obvious different characteristic in geology, reservoir engineering and development, so it's almost no relevant research outcome and exploitation sample has been reported in and out of country. Aim at this situation. Because of its thin layers and high permeability, cretaceous K1h23 sand group K1h23-4 reservoir, which is in Lu9 area. Kelamayi field, Xinjiang province, is choosed as a typical bottom-water reservoir for researching. According to my study, it systematically makes certain this kind of reservoir and the similar kinds' characters in geology, reservoir engineering and development mechanism (maybe these characters or questions are not obvious in typical bottom-water reservoir in and out of country). Moreover, my outcome brings forward methods and technique application strategies for optimal exploiting bottom-water reservoir with thin-bedded, low-amplitude and high-permeability.During my research work on K1h23-4 reservoir in Lu9 area, which is a typical bottom-water reservoir with thin layers and high permeability, multiple methods and models of reservoir engineering, hydrodynamic principle and reservoir simulation are synthetically applicated. And corresponding development theory and viewpoints are obtained. This study has positive effect on further study and reasonable development of bottom-water reservoir with thin layers and high permeability. In terms of this kind of reservoir, it first introduces the concept of oil thick ratio for dividing the type of thin-bedded, high permeability and bottom-water reservoir in my dissertation. This concept is from the injection-production unit well group simulation of bottom-water reservoir. The research indicates that oil thick ratio concept can not only reflect the water and oil layer's inherent geological characteristic synthetically but also can accord with the really productive situation. So this concept provides theoretical proof for type dividing and divisional optimal development of bottom-water reservoir with thin layers and high permeability. At the same time, many reservoir engineering and development technique questions has been further studied in this dissertation such as bottom water body's size, perforating technique, liquid (oil) production of different thin-bedded bottom-water reservoir, reasonable liquid production rate and pressure differential, water injection rate and injection-production pressure differential, injection to production ratio control, oil production rate control etc. These theoretical methods and viewpoints can direct the development of thin-bedded, high-permeability, bottom-water reservoir such as K1h23-4 reservoir and provide approach for reasonable developing the similar reservoirs.