摘要
针对多层合采砂岩油藏层间干扰影响因素及其定量表征方法研究较少的现状,研究了层间动态干扰系数的影响因素及其计算方法。从单层油藏出发并结合层间干扰定义,建立了多层合采砂岩油藏动态干扰数学模型。研究结果表明:层间动态干扰系数随着含水率增加而增大,低含水期随着生产压差增大而减小,高含水期随着渗透率级差降低而减小。以此为基础,提出了降低层间干扰的对策,并在渤海SZ油田应用。以油井卡层和注水井分层调配降低干扰为例,其开发规律表现为:油井卡层及周边注水井分层调配后动态干扰系数均降低;油井含水率超过80%后,即使周边注水井继续分层调配,动态干扰系数仍然会恢复到分层调配前动态干扰系数变化的趋势线上,表现为分层调配措施效果变差。该成果为同类油田层间矛盾的定量评价及降低层间矛盾策略的制定提供了借鉴。
To solve the problem of lacking studies on influencing factors of interlayer interference and quantitative characterizing methods for multilayer commingled reservoir, mathematical model of dynamic interference in multilayer commingled reservoir was established according to the seepage law of single-layer reservoir and the definition of interlayer interference. Study shows that interlayer dynamic interference coefficient firstly increases with the increasing of water cut, decreases with the increasing of producing pressure drop in low water-cut stage, and decreases with the decreasing of permeability ratio in high water-cut stage.Strategies to reduce interlayer interference are proposed based on the research and applied in SZ Oilfield in Bohai Bay. Shutting down layers with high water cut for production well and injection allocation for separate injection well can reduce interlayer dynamic interference coefficient. The development law shows that the interlayer dynamic interference coefficient decreases with shutting down layers with high water cut for production well and injection allocation for separate injection well nearby, while after the water cut is over 80%, interlayer dynamic interference coefficient would turn back on the trend line of the changing interlayer dynamic interference coefficient before injection allocating even though injection allocating for separate injection well nearby is going on, which shows that the effect of injection allocating is getting worse. The results of the study provide references for quantitatively evaluating the interlayer contradiction and making strategies to reduce it in similar oilfields.
出处
《断块油气田》
CAS
北大核心
2016年第3期334-337,353,共5页
Fault-Block Oil & Gas Field
基金
国家科技重大专项课题"海上油田丛式井网整体加密及综合调整油藏工程技术应用研究"(2011ZX05024-002)
"海上油田丛式井网整体加密及综合调整油藏工程技术示范"(2011ZX05057-001)
关键词
多层合采
砂岩油藏
层间矛盾
动态干扰系数
影响因素
multilayer commingled production
sandstone oil reservoir
interlayer contradiction
interlayer dynamic interference coefficient
influencing factors
