Abstract
in long-term water drive reservoir, small dose and short radius profile control can not meet the needs, so deep profile control and flooding are needed. During the placement and processing of conventional deep profile control and flooding agent, the zoning classification formed by the changes of pressure field and fluid field are not taken into account. In the paper, the iso-pressure drop gradient progressive deep profile control and flooding method were studied. According to drawdown curve, the formation was divided into near wellbore zone, well-far zone and deep zone. As each zone of the pressure gradient is different and therefore different intensity of slugs are required. According to iso-pressure drop gradient rule, namely the breakthrough pressure gradient of agent is equal to the formation pressure gradient, each slug blocking agent was screened. Then the slugs of agent were combined, and optimized at the lowest cost. Hence, the flooding agents with different intensity were placed in different locations, and the fluid diversion of whole course achieved by combining the different intensity of blocking agent. The method was tested successfully for 2 wells in Zhuangxi block of Shengli Oilfield, the construction slugs were divided into three slugs after our optimization. The average injection pressure was increased by 3.25 MPa, approximate 400 tons of incremental oil was obtained with 3.04% water-cut decrease.
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