摘要
针对特低渗油藏地层能量下降大、压裂液难以返排的难题,进行了二氧化碳段塞辅助压裂技术的研究和试验。在压裂前注入液态二氧化碳,利用混相与溶解气作用,起到补充地层能量和提高压裂后助排效果的目的。通过室内试验研究和数值模拟,确定了以桩74块为代表的低渗油藏原油与二氧化碳的最小混相压力,并优选了最佳闷井时间和压裂施工参数,现场应用5口井,取得了较好的试验效果和经济效益。
Carbon dioxide slug assisted fracturing technique has been studied and tested in accordance with the problem of drastic decline of producing energy and the difficulty of fracturing fluid flowback in extra-low permeability reservoirs.Liquid carbon dioxide is injected before fracturing to supplement producing energy and improve post-fracturing cleanup by using miscible phase and dissolved gas actions.Laboratory study and numerical simulation have been conducted to determine the minimum miscibility pressure between crude oil and carbon dioxide for typical low permeability reservoirs such as Zhuang 74 Block,and to optimize shut-in time and fracturing operation parameters.Field application in 5 wells has achieved good result and economic benefit.
出处
《特种油气藏》
CAS
CSCD
2009年第3期102-104,共3页
Special Oil & Gas Reservoirs
关键词
低渗透油藏
二氧化碳
辅助
压裂
最小混相压力
闷井时间优化
施工参数优化
low permeability reservoir
carbon dioxide
fracturing
assisted
minimum miscibility pressure
shut-in time optimization
operation parameters optimization
field application
