摘要
目标区块L油藏是一个典型的低孔超低渗透油藏,其非线性渗流特征明显,储层应力敏感性强,注采井间难以建立有效驱替,且由于储层隔夹层发育,注采参数与井网系统匹配不够合理,进一步加剧了油藏开发难度。针对上述问题,建立了隔夹层发育的精细油藏数值模型,在考虑启动压力梯度和应力敏感的基础上,量化了其对产能的不利影响,同时优化得到了1套与井网系统匹配性更好的注采参数。研究结果表明:1)开发初期启动压力梯度与应力敏感对产能的影响较大,且启动压力梯度对产能的影响程度大于应力敏感,而在开发后期,油井含水率上升成为了影响产能的主要因素。2)对于井网系统,当注水强度为1.94 m^(3)/d·m,超前注入时机为9个月,合理单井超前注水量约为5600 m^(3),超前注水压力保持水平为132%时,目标油藏可以达到较好的开发效果。该研究成果为L油藏及同类型油藏改善注水开发效果提供了方法技术借鉴。
L reservoir in the target block is a typical low-porosity and ultra-low permeability reservoir with obvious nonlinear flow characteristics and strong reservoir stress sensitivity,which makes it difficult to establish effective displacement between injection and production wells,and further aggravates the difficulty of reservoir development due to the well-developed reservoir interlayers and the unreasonable matching between injection and production parameters and well pattern system.To solve these problems,a detailed numerical model with well-developed interlayers was established,and its adverse effects on productivity were quantified,taking into account the starting pressure gradient and stress sensitivity,and the injection and production parameters of the entire well pattern system were optimized.The results show that:1)Starting pressure gradient and stress sensitivity have a greater impact on productivity in the early stage of development,and the impact of starting pressure gradient on productivity is greater than that of stress sensitivity,while water cut rise becomes the main factor affecting productivity in the later stage of development;2)For the well pattern system,the target reservoir can achieve better development results when the injection intensity is 1.94 m^(3)/d·m.The advanced injection time is nine months,the reasonably advanced injection water per well is about 5600 m^(3),and the advanced injection pressure is maintained at 132%.The research results provide a method and technology reference for improving the waterflood development effect of L reservoir and similar reservoirs.
作者
田亚飞
谢启超
尚教辉
阎浩
王锋
乐平
刘新菊
刘万涛
TIAN Yafei;XIE Qichao;SHANG Jiaohui;YAN Hao;WANG Feng;YUE Ping;LIU Xinju;LIU Wantao(The Second Oil Production Plant,Changqing Oilfield Company,PetroChina,Gansu Qingyang 745600,China;Research Institute of Exploration and Development,Changqing Oilfield Company,PetroChina,Xi′an 710000,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)
出处
《非常规油气》
2024年第6期91-99,共9页
Unconventional Oil & Gas
基金
国家自然科学青年基金项目“考虑启动条件和井筒压降的底水油藏分支水平井水脊耦合模型”(51404201)
四川省科技厅—四川省重点研发计划项目“致密油藏水平井体积压裂多尺度非线性流动耦合模型及产能预测”(2020YFQ0034)。
关键词
注采参数
启动压力梯度
应力敏感
超低渗透油藏
注采井网
injection and production parameters
starting pressure gradient
stress sensitive
ultra-low permeability reservoir
injection and production pattern
