葡北油田三间房组油藏天然气重力驱特征及影响因素

doi:10.7657/XJPG20230310

摘要/Abstract

摘要：

为探索吐哈盆地葡北油田实施天然气重力驱开发的可行性，明确不同实施参数下的驱油特征，通过高压物性分析、细管实验、CT扫描成像及全直径岩心驱替实验，分析了葡北油田开发前后中侏罗统三间房组储集层流体的高压物性变化特征，计算了目前油藏条件下鄯乌管道气和西气东输气的最小混相压力，比较了不同驱替方式下流体的分布特征及岩心沿程含油饱和度变化，明确了注气速度、注气压力及岩心倾角对天然气重力驱的影响。结果表明，开发后原油密度与饱和压力均增大，黏度变化不明显，原油中C₂—C₆含量显著下降；目前油藏条件下鄯乌管道气和西气东输气与储集层原油的最小混相压力分别为48.2 MPa和49.5 MPa，均大于原始油气最小混相压力；相比水驱结束状态，天然气重力驱沿程含油饱和度存在较大差异，岩心高部位含油饱和度明显低于低部位含油饱和度，重力驱对于高部位原油的动用效果更为明显；较低的注气速度、较高的驱替压力以及较大的倾角均有利于提高天然气重力驱的原油采收率。

关键词: 吐哈盆地, 葡北油田, 中侏罗统, 三间房组, 天然气重力驱, 重力分异, 采收率, 影响因素

Abstract:

To explore the feasibility of natural gas gravity drainage in the Pubei oilfield of the Turpan-Hami basin, the oil displacement characteristics under different operation parameters were clarified. By way of high-pressure physical property analysis, slim tube test, CT scanning imaging, and full-diameter core displacement experiments, the variations of the high-pressure physical properties of the fluids in the Middle Jurassic Sanjianfang formation reservoir before and after the flooding in the Pubei oilfield were analyzed, the minimum miscible pressure of the gas in the Shanshan-Urumqi Gas Pipeline and the West-East Gas Pipeline under current reservoir conditions was calculated, the fluid distribution characteristics and the changes in oil saturation along the core under different displacement methods were compared, and the influences of injection rate, injection pressure, and rock dip angle on natural gas gravity drainage were clarified. The results show that after flooding there are increases in both crude oil density and saturation pressure, an unconspicuous change in viscosity, and significantly decrease contents of C₂-C₆ contents in the crude oil. The minimum miscibility pressures of the gas in the Shanshan-Urumqi Gas Pipeline and the West-East Gas Pipeline with oil are 48.2 MPa and 49.5 MPa, respectively, both higher than the minimum miscibility pressure of the original oil and gas. Compared with the performance after water flooding, the natural gas gravity drainage reveals very different oil saturations along the core: the oil saturation at the high position of the core is significantly lower than that at the low position, indicating that the natural gas gravity drainage is more effective in displacing the crude oil at the high position. Low injection rate, high displacement pressure, and large dip angle are all beneficial to improving the oil recovery of natural gas gravity drainage.

Key words: Turpan-Hami basin, Pubei oilfield, Middle Jurassic, Sanjianfang formation, natural gas gravity drainage, gravity differentiation, recovery factor, influencing factor

中图分类号:

TE357

肖志朋, 齐桓, 张艺桢, 李宜强, 姚帅旗, 刘通. 葡北油田三间房组油藏天然气重力驱特征及影响因素[J]. 新疆石油地质, 2023, 44(3): 334-340.

XIAO Zhipeng, QI Huan, ZHANG Yizhen, LI Yiqiang, YAO Shuaiqi, LIU Tong. Characteristics and Influencing Factors of Natural Gas Gravity Drainage in Sanjianfang Formation Reservoir of Pubei Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(3): 334-340.

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