| With the improvement of the reservoir development degree and level, encryption adjustment technology has become an important measures to enhance oil recovery of most oil fields with large well spacing. How to understand the key affecting factors of the oil fields efficient development correctly and basically, and establish a response indicators system of encryption effect to form a complete evaluation method of encryption effect have a great significance for the development of oil fields efficiently.Based on the exisiting problems of oilfields’overall encryption evaluation method, aimed at the BoHai-M oilfield, the following work has been carried out and the corresponding results has been obtained:(1) The analysis of relationships and changes among many factors such as pressure gradient distribution, ultimate injection and production well space, injection effective scope which are caused by well spacing and pressure difference. Then several key factors which impact oilfield’s efficient development are studied.(2) Five categories such as recovery response index, output and storage conditions index, well network perfect condition response index, moisture status response index and waterflood status response index has been selected to establish index evaluation system of overall encryption effect. And the calculation method of each effect response index analyzed. Then the evaluation criteria of each indicator has also been determined.(3) With the Buckley-Leverett Equation, and material balance principle, differential streamline theory has been establishedto study the the rules and relationships between waterflood oil recovery and water production rate.(4) Based on the BoHai-M reservoirs, with the established overall encryption effect response index evaluation system, a analysis for the improving situation of M reservoirs’ former and latter development effects. And finally, some optimization recommendations are proposed. |
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