冯科文,穆朗枫,阎逸群,吴忠宝,李齐,张原
FENG Kewen,MU Langfeng,YAN Yiqun,WU Zhongbao,LI Qi,ZHANG Yuan

• 1:中国石油勘探开发研究院数模与软件中心
• 2:北京大学地球与空间科学院
• 3:中国地质科学研究院
• 4:大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

气体辅助重力驱的注气开发方式逐渐成为油气开发的研究热点。在前人研究的基础上,引入邦德数、黏度比和毛管数的回归指数,提出考虑地层倾角影响的气体辅助重力驱采收率预测新方法。通过建立三维理论模型,研究了地层倾角、渗透率和K_V/K_H等因素对气体辅助重力驱开发效果的影响,并以国内油藏为例建立了实际油藏的数值模型,优化设计出合理的注气参数。研究表明:地层倾角大、渗透率高的储层更易形成气顶,一般临界地层倾角大于10°;储层非均质性增强,利于流体的重力分异,气体辅助重力驱开发效果较好;合理注采比为1.2,模拟预测研究区采用气体辅助重力驱20 a采出程度较传统注水提高11.23%。研究成果可为油田注气开发及其提高采收率提供理论指导。
The gas-assisted gravity drainage(GAGD) has gradually become the research hotspot of the petroleum development. Based on the previous studies, Bond number, viscosity ratio and regression index of the capillary number were introduced, the new predicting method for GAGD recovery considering the influence of the formation dip angle was presented. By establishing the three-dimensional theoretical model, the influences of the formation dip,permeability, K_V/K_H and so forth on the development effects of the gas-assisted gravity drainage were studied. And moreover the domestic oil reservoirs were taken as the example to establish the numerical model of the actual reservoirs and optimally design the reasonable gas injecting parameters. The researches show that the reservoir with a large dip angle and high permeability is more likely to form a gas cap, generally, the critical formation dip is greater than 10°; the reservoir heterogeneity is enhanced, which is beneficial to the gravity differential of the fluids;the development effects of the gas-assisted gravity drainage are pretty better; the reasonable injection-production ratio is 1.2, the 20-year enhanced recovery factor by GAGD simulated and predicted in the study area is higher by 11.23% compared with that of the conventional water injection. The research results can provide the theoretical guiding to the gas injection development and the enhanced recovery of the oilfield.

关键词(KeyWords)： 气体辅助;重力驱预测方法;非均质性;地层倾角;采收率
gas-assisted gravity drainage(GAGD);predicting method;heterogeneity;formation dip;recovery factor

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“低渗—超低渗油藏有效开发关键技术”(2017ZX05013-004);; 中国石油天然气股份有限公司科研项目“新区规模动用效益建产技术研究与应用”(KT2018-13-01)

作者(Author): 冯科文,穆朗枫,阎逸群,吴忠宝,李齐,张原
FENG Kewen,MU Langfeng,YAN Yiqun,WU Zhongbao,LI Qi,ZHANG Yuan

DOI: 10.19597/j.issn.1000-3754.201911013

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