摘要
针对低渗储层水驱开发中易窜进、优势大孔道调剖堵水困难的问题,开展了多级变流度的实验研究,以控制不同渗流空间注入水的流度与提高水在微小孔喉中的流度和驱替效率。以鄂尔多斯盆地东部三叠系长6段某储层为例,基于对储层不同渗流空间的分级,进行单块岩心实验和组合变流度实验来评价水驱效率。结果表明:该储层可分为裂缝、中大孔和微小孔三类渗流空间,且不同渗流空间的水驱流度级差极大,裂缝是主要窜流通道,中大孔是次要渗流通道,微小孔是主要储集空间;单块岩心变流度实验中,水驱流度可调整到(0. 01～0. 10)×10^(-3)μm^2/(m Pa·s);组合实验中水驱流度调整到(0. 01～0. 10)×10^(-3)μm^2/(m Pa·s),水驱效率平均提高了26. 9%;矿场试验取得了很好的增油降水效果,井组内6口生产井降水最高达34. 0%,井组平均日增油1. 22 t。
Aiming at easy channeling and difficult plugging of large pore paths in the water flooding of low permeability reservoir,the experimental study of multi-stage fluidity water flooding was carried out to control the fluidity of injected water in the percolation space of different size,improve the fluidity of the injected water in micro pore throat and increase the oil displacement efficiency.Taking a reservoir of Triassic Chang 6 member in eastern Ordos Basin as an example,single core and combined variable fluidity water flooding experiments were carried out to evaluate the water flooding efficiency based on the classification of different seepage spaces.The experimental results show that,the seepage space of the reservoir can be classified into three types of fracture,medium-large pore and micro-pore,and their water drive fluidity varies greatly.The fracture is the main channeling path,the medium-large pore is the secondary seepage channel,and the micro-pore is the main reservoir space.The water drive fluidity can be adjusted to(0.01~0.1)×10-3μm 2/(mPa·s)in the single core water flooding experiments;the water drive fluidity can also be adjusted to(0.01~0.1)×10-3μm 2/(mPa·s)in the combined variable fluidity water flooding experiments,and the water flooding efficiency was increased by 26.9%on average.The field test has achieved good increasing oil and dewatering effect.The dewatering rate of six production wells in the test well group is up to 34.0%,and the average daily oil increment of the well group is 1.22 t.
作者
李晓骁
任晓娟
罗向荣
刘雨烟
马焕焕
王宁
LI Xiaoxiao;REN Xiaojuan;LUO Xiangrong;LIU Yuyan;MA Huanhuan;WANG Ning(College of Petroleum Engineering,Xi'an Shiyou University,Xi'an 710065,Shaanxi,China)
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2018年第5期50-56,共7页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家"十三五"科技重大专项"鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程"(2016ZX05050006)
关键词
低渗储层
优势大孔道
渗流空间
水驱效率
流度级差
low permeability reservoir
large pore path
seepage space
water flooding efficiency
fluidity ratio
