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孤岛油田南区西部Ng5— 6砂层组原油粘度比较高 (平均 4 65 5MPa·s) ,因而水驱开采难度大。截至 2 0 0 1年 12月 ,采出程度只有 5 4 5 % ,储层大面积发育 ,符合蒸汽吞吐开发的筛选条件 ,并且原油粘度对温度的敏感性强 ,温度每升高 10℃ ,原油粘度下降一半左右。经历了三个开发阶段 :水驱、局部注采结构调整、热采降粘试验。从各阶段生产情况来看 ,只有热采降粘试验阶段开发效果较好
The viscosity of crude oil in the Ng5-6 sandstone formation in the western part of South Island of Gudao Oilfield is relatively high (average 4 65 5MPa · s), making it difficult to conduct waterflooding. As of December 2001, the recovery rate was only 54.5%. Large-scale reservoir development was in line with the screening conditions for the development of steam stimulation, and the viscosity of crude oil was highly sensitive to temperature. For every 10 ° C increase in temperature, crude oil Viscosity decreased by about half. Has experienced three stages of development: water flooding, partial injection and injection structure adjustment, thermal mining viscosity reduction test. From the production of various stages of view, only the development of the thermal absorption and viscosity reduction test phase is better