摘要
HH油田为典型的低孔特低渗油藏,部分地层伴有裂缝发育,现面临衰竭式开采后注水开采压力高的难题。通过基质单管岩心驱替实验,探究目标地层进行注气开发的可能性,明确何种注入气体及驱替方式具有较好提高采收率效果。通过基质+裂缝双管并联岩心驱替实验,确定目标地层中微裂缝对提高采收率效果影响。结果表明,CO_(2)较减氧空气是更好的注入气体,CO_(2)/水交替驱替是提高采收率优秀的驱替方式;裂缝的存在会严重影响采收率,裂缝+基质双管并联岩心CO_(2)/水交替驱采收率较单管基质岩心降低27.09%。建议选择CO_(2)为注入气体,对基质储层或采取改善非均质性措施的裂缝区域采用CO_(2)/水交替开发,对裂缝性低渗油藏注气开采有一定参考意义。
HH oilfield is a typical low porosity and ultra-low permeability reservoir with fracture development in some strata.Now it is facing the problem of high water injection production pressure after depletion production.Through the matrix single tube core displacement experiment,explore the possibility of gas injection development in the target formation,and clarify what kind of injected gas and displacement method have better EOR effect.Through the matrix-fracture double tube parallel core displacement experiment,the influence of micro fractures in the target formation on EOR is determined.The results show that CO_(2) is a better injection gas than oxygen reducing air,and CO_(2)/water alternative displacement is an excellent displacement method to enhance oil recovery;The existence of fractures will seriously affect the recovery.Compared with single tube matrix core,the recovery of CO_(2)/water alternative drive in fracture+matrix double tube parallel core is reduced by 27.09%.It is suggested that CO_(2) should be selected as the injection gas and CO_(2)/water alternate development should be adopted for the matrix reservoir or the fractured area with measures to improve heterogeneity,which has a certain reference significance for the gas injection production of fractured low permeability reservoir.
作者
张志威
王长权
靳世磊
石立红
黄建红
ZHANG Zhiwei;WANG Changquan;JIN Shilei;SHI Lihong;HUANG Jianghong(School of Petroleum Engineering, Yangtze University, Wuhan 430100, China;Shengli Oilfield Dongsheng Group Co., Ltd., Shandong Dongying 257000, China;Exploration and Development Research Institute of Qinghai Oilfield Company, Gansu Dunhuang 736202, China)
出处
《非常规油气》
2022年第1期65-70,共6页
Unconventional Oil & Gas
基金
国家自然科学基金项目“高温高压CO 2-原油-地层水三相相平衡溶解度规律”(51404037)。
关键词
低孔低渗
裂缝
CO_(2)驱
减氧空气驱
气水交替驱替
low porosity and low permeability
cracks
CO_(2)flooding
oxygen reducing air flooding
gas water alternate displacement
