疏松砂岩油藏化学驱技术研究与试验

曙光油田曙三区为疏松砂岩油藏,埋藏深度为950 m,储层泥质含量高达13.9%。受此影响储层压实作用差、胶结疏松,油井出砂严重,开发效果差,预测采收率仅为30.8%。针对曙三区疏松砂岩油藏已进入开发中后期,含水上升快、采油速度低等问题,开展疏松砂岩油藏化学驱相关油藏工程研究,结果表明,采用优化的化学驱配方体系,辅助系列防砂技术可有效提高采收率。将研究结果应用于6个井组的化学驱先导试验,日产油明显提高,综合含水下降14.2个百分点,有效改善开发效果。该研究为同类油藏化学驱开发提供了借鉴意义。

Research and Test of Chemical Flooding Technology in Unconsolidated Sandstone Reservoirs

The Shusan block of Shuguang Oilfield is an unconsolidated sandstone reservoir with a burial depth of 950 m and a shale content of 13.9%. Affected by this, the compaction of the reservoir is poor and the cementation of the reservoir is loose. The sand production of oil wells in the reservoir is serious, with poor development effects, and the predicted recovery rate is only 30.8%. The unconsolidated sandstone reservoir in Shu 3 block has entered into themiddle and later development stages, which has encountered a series of problems such as rapid water rise and poor development effects. After carrying out the research on chemical flooding related to reservoir engineering, the results show that the optimized formula system for chemical flooding and the ancillary sand control technologies can effectively improve oil recovery. Applying the research results to 6 well groups, after the pilot test of chemical flooding, the daily oil production was significantly increased, and the comprehensive water cut decreased by 14.2 percentage points, which effectively improved the development effect. The research provides a reference for the chemical flooding development of similar reservoirs.