Study On Key Evaluation Indexes Of Waterflooding Development Effect Of Sandstone Reservoirs In Junggar Basin, Xinjiang

Proven sandstone reservoir in xinjiang has proven reserves of 436.3691 million tons, accounting for 33.41% of the total reserves of thin oil reservoir, is one of the main distribution area of sandstone reservoir in our country. Generally similar to the vast majority of oil fields, sandstone reservoirs with strong interlayer, layer and plane heterogeneity universally apply water injection development pattern to maintain formation energy. Consequently, phenomena of rising water cut and higher moisture content would occur. Therefore, whether the reservoir water flooding development effect is good or bad becomes the core issue of oilfield management concern. With the progress and development of oil development technology, the original sandstone reservoir development dynamics, and the evaluation of the effect of industry standards (SY/T6219-1996) can not fully reflect reservoir development potential and development technology. Applying what kind of the evaluation index system and evaluation standard, has becoming the main problem of how to evaluate the efficacy of the sandstone reservoir development.Aiming at the problems of reservoir development effect evaluation, This paper embarks from the geology, engineering, economics, etc, combined with the percolation theory, reservoir engineering and water flooding, researching sandstone reservoir water flooding development effect. Not only can determine different development phase of dynamic index is conforming to the objective laws or not,but also providing technical direction of reservoir development effect should be taken and proving experience for other reservoirs establish standards.the following research results were obtained:1) adopting WuYouJia sandstone reservoir classification method, the sandstone thin oil reservoir in xinjiang is divided into three major categories, eight small classes.2) setting up xinjiang sandstone thin oil reservoir water flooding development effect evaluation index system,including a primary index (recovery) and 14 secondary indicators.3) Combining the physical meaning of key indicators and relevant researches of reservoir engineering and seepage flow, the evaluation index of the 15 key calculation method is established. Moreover, a new type of water drive curve expression is derived.4) using dynamic analysis methods and combining the theory with practice, through the study of the change rule of key indicators system, the evaluation index of the 15 key evaluation criterion is established. Furthermore, the fuzzy comprehensive evaluation method verifies the reliability of the evaluation index standard.