摘要
根据水平井置胶成坝深部液流转向技术思路,采用室内水驱油实验结合计算机断层扫描(CT)成像技术,研究水平井置胶成坝提高采收率机理。人工胶结非均质模型表面用环氧树脂浇铸,对模型置胶成坝前后水驱油过程进行CT动态扫描,观察胶坝分布特征,跟踪非均质模型内部油水分布、水驱流线改变、流体饱和度分布及其动态变化。结果表明:对于正韵律油层,应用水平井置胶成坝,能够有效封堵高渗透层位深部窜流通道,使注入水转向驱替,启动低渗透层位剩余油。置胶成坝后,水驱采收率提高16.7%,含水上升速度减慢。水平井置胶成坝技术突破了堵剂深部放置的技术瓶颈,实现油藏深部液流转向,有效扩大了水驱波及体积,是正韵律厚油层高含水期一项有前景的控水挖潜技术。
According to the concept of in-depth fluid diversion by ＂gel dam＂ place with horizontal well,its EOR mechanism is studied by means of laboratory water flooding experiment combined with X-ray computer tomography（CT） technique.In the experiment,the artificial cementing heterogeneous model is casted with epoxy resin on surface,and the flooding processes before and after the ＂gel dam＂ formed are scanned dynamically by X-ray CT.Through observing the distribution feature of gel dam,tracking the oil and water distribution,water flooding streamline change,oil saturation distribution and its dynamic variation,it is indicated that ＂gel dam＂ can effectively shut off the deep channeling in higher permeability layer,and divert the injected water into upper low-permeability layer to displace the remaining oil therein.After ＂gel dam＂ is formed,the ultimate oil recovery by water flooding increased by 16.7%,and the water cut ascending velocity slowed down.With ＂gel dam＂ technique,gel can be placed in the in-depth reservoir zone to achieve in-depth fluid diversion,which increase the water flooding sweep efficiency and oil recovery.＂Gel dam＂ in-deep fluid diversion technique is a promising EOR method for positive rhythm thick reservoirs.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2011年第6期733-737,共5页
Petroleum Exploration and Development
基金
中国石油勘探开发研究院石油科技中青年创新基金(2009-B-10-07)
关键词
CT扫描
胶坝
深部液流转向
水平井
正韵律
X-ray CT scanning
gel dam
in-depth fluid diversion
horizontal well
positive rhythm
