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大庆油田已进入高含水期，河流三角洲相正韵律厚油层存在着严重的非均质性，注水开发效果较差。为了改善开发效果，选择低、高弯度河型厚油层两个试验区进行了注天然气非混相驱先导性矿场试验。试验表明，水、气交替注入后，在油层中形成油、气、水三相流动，增加了渗流阻力，改善了吸入剖面；由于重力分异作用，驱扫了正韵律厚油层顶部的剩余油。对于河流相储层，顺点坝走向或河道沉积方向注气效果好。试验区现已提高采收率３．５５％～４．０％，预计最终采收率提高９．０％左右，经济效益显著。试验证明，注天然气非混相驱是提高采收率的一种实用技术。
Daqing Oilfield has entered a high water cut period. There is a serious heterogeneity in the thick rhythm thick reservoirs in the river delta, and the water injection development has a relatively poor effect. In order to improve the development effect, two pilot zones of low and high curvature river thick reservoirs were chosen to carry out the pilot natural gas immiscible flooding pilot test. Experiments show that after alternating injection of water and gas, three-phase flow of oil, gas and water is formed in the reservoir, which increases the seepage resistance and improves the suction profile. Due to the gravitational differentiation, the residual oil at the top of the positive rhythm thick oil reservoir is swept . For the river facies reservoir, cis-point dam direction or direction of the river gas injection effect. The test area has been enhanced recovery of 3.55% ~ 4.0%, the estimated final recovery rate increased by about 9.0%, significant economic benefits. Experiments show that injection of natural gas is not miscible flooding is a practical technology to improve oil recovery.