摘要
为了研究碳酸盐岩油藏裂缝干扰规律,设计了岩心尺度的模拟平行裂缝的物理模型,并借助CT扫描监测了裂缝中油-水两相流动动态,初步明确了平行裂缝的竞争与屏蔽效应。研究结果表明,缝间干扰流动存在竞争和屏蔽2个阶段,两者在时间和空间上是过渡的,可通过相对干扰系数(fracture interference,RIF)来量化裂缝间的影响程度。裂缝间的屏蔽存在界限,这一界限主要与裂缝间的渗透率级差有关,渗透率级差超过16即会产生水相沿主裂缝突破后完全屏蔽次裂缝的现象。
In order to study the mechanisms of fracture interference,a core scale physical model was designed,and the CT scan was chosen to quantify the flow dynamics of oil and water in the fractures.Based on the experiments conducted in this paper,the competition and shielding effects between fractures were clarified.Results show that,the water flooding in the main fracture is faster than that in the minor fracture at the early time,which called the competition period,then the water will breakthrough at the outlet of the main fracture and the flow of the water in minor fracture will stopped,then the shielding effects forms.A coefficient of fracture interference(RIF)was defined to quantify the degree of fracture interference.There is a boundary for facture interference which is mainly determined by the permeability ratio.For the experiments conducted in this paper,the minor fracture was totally shielded by the main fracture when the permeability ratio reached 16.
作者
李亮
伍亚军
陈文滨
马淑芬
张潇
姜汉桥
LI Liang;WU Yajun;CHEN Wenbin;MA Shufen;ZHANG Xiao;JIANG Hanqiao(Research Institute of Petroleum Engineering and Technology,Northwest Oilfield Company,SINOPEC,Urumqi 830011,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《中国科技论文》
CAS
北大核心
2021年第5期556-563,共8页
China Sciencepaper
