关键词: 可动凝胶调驱, 提高原油采收率, 深部调驱, 矿场试验, 华北油田, 砂岩油藏

Abstract: The laboratory research and field tests on movable gel as profile control and flooding for complex fractured sandstone reservoir were carried out in Huabei Oilfield. A great progress has been acquired. The interim accumulative oil production gained from seventeen blocks is 58 thousand tons. The combined water cut decreased by 10 percent, and the input-output ratio is the proportion of one to three The test results show that the movable gel as profile control and flooding not only improve the water injection and liquid production profile but also reduce the mobility ratio oil to water, which brings down water cut and improves oil production. When the economic benefit of water flooding become worse, the movable gel as profile control and flooding should be operated as early as possible. Many factors may affect the profile control and flooding effects, including reservoir conditions, exploitation actuality, movable gel system capability, rationality of water flooding project and management during field operation. In order to improve the effect, some factors, including the gel dosage,injection rate, relationship between profile control and measures for improving wells, the water flooding system after gel flooding, should be comprehensively considered. Movable gel as profile control and flooding is an economic and available technology to improve the water-flooding effects for sandstone reservoir.

Key words: movable gel profile control, enhanced oil recovery, deep profile control and flooding, field test, Huabei Oilfield, sandstone reservoir