延长油田注水开发技术研究及矿场实践  

Water Injection Optimization Technology and Mine Practice of Yanchang Oilfield

作　　者：张刚[1] 刘杰[1] 白耀文[1] 杜秀秀 高萌[1] Zhang Gang;Liu Jie;Bai Yaowen;Du Xiuxiu;Gao Meng(Dingbian Oil Production Plant of Yanchang Oilfield Co., Ltd., Yulin, Shaanxi 718600, China)

机构地区：[1]延长油田股份有限公司定边采油厂,陕西榆林718600

出　　处：《非常规油气》2020年第2期88-93,82,共7页Unconventional Oil & Gas

基　　金：陕西省科技统筹创新项目“延长油田主力油层小型矿场先导性试验与示范工程”(2011KTZB01-04-06)资助。

摘　　要：延长油田为典型的特低渗透油藏,该类油藏储层孔喉细小,微裂缝和人工裂缝发育,纵向非均质严重,水驱采收率低。为了改善延长油田注水现状,提高油田注水开发效果,通过室内实验和数值模拟技术手段,研究了井网形式、注水压力、地层压力、注水强度、注水速度等重要参数,在此基础上形成了注水开发技术政策。研究结果表明,在菱形反九点井网下,注水压力为7~10 MPa,注采比保持在0.9~1.1,注水强度为0.5~1.8 m^3/(d·m),注水速度为7~10 m^3/d,注水效果较为理想。矿场实施效果显著,注水规模逐年扩大,注水区块单井产量平均提高0.1 t/d,地层压力明显恢复,自然递减下降1.7个百分点。以上成果为矿场注水开发提供了重要的技术参考。Yanchang oilfield is a typical extra-low permeability reservoir,in which the pore throat is small,micro-fractures and artificial fractures are developed,the longitudinal heterogeneity is serious,and the recovery rate of water flooding is low.In order to improve the present situation of oilfield water injection and improve the effect of oilfield water injection development,the important parameters such as well pattern,water injection pressure,formation pressure,water injection intensity and water injection speed were studied by laboratory experiments and numerical simulation techniques.The results show that the water injection pressure is 7~10 MPa,the injection-production ratio is maintained at 0.9~1.1,the water injection intensity is 0.5~1.8 m^3/(d·m),the water injection speed is 7~10 m^3/d,and the water injection effect is relatively ideal.The scale of water injection increased year by year.The average output per well in the water injection block increased by 0.1 t/d.The formation pressure recovered significantly and the natural decline decreased by 1.7 percentage points.The above achievements provide important technical reference for the field waterflood development.

关 键 词：注水开发 注采井网 注水压力 注水强度 技术政策 开发效果 

分 类 号：TE348[石油与天然气工程—油气田开发工程]