鄂尔多斯盆地化109区长2油藏注水开发政策研究
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摘要
化子坪区长2油层属于低渗、低产、低丰度的"三低"油藏。随着开发的进行,油藏进入高含水阶段,油藏采油能力不断下降,开发政策亟须调整。本文以化109区长2油藏为研究对象,利用实际生产数据和数值模拟技术,分析油藏开发现状,论证不同开发方案,提出相应开放政策。结果表明:经过多年注水开发,目前油藏年递减率为9. 2%,含水率91. 5%,年含水上升约0. 7%,开采程度10. 5%,地层压力保持水平较高。油藏剩余油丰富,主要集中在河道交汇处(河道边部)和井间微型正向构造处。经过油藏工程论证,油藏开发合理地层压力保持水平应为100%,合理注采比应为1. 0,合理注水强度应为4. 9 m3/m·d。应从扩边调整、注水调整和治理低产低效井三个方面调整注水开发政策,提高油藏开发水平。
Chang2 reservoir in Huaziping area Ordos Basin,which belonged to lowly infiltrates,lowly produces,low abundance. It is also called " three low" oil deposition. With the development of reservoir,the reservoir enters the high water cut stage,and the oil recovery capacity of the reservoir is declining continuously,so the development policy needs to be adjusted urgently. In this paper,Chang2 in Hua109 area is taken as the research object,to analyze reservoir development status,demonstrate different development schemes,and put forward corresponding development policies,by combining with actual production data and numerical simulation technology. The results show that: After years of development,the annual decline rate of reservoir is 9. 2 %,the water cut is 91. 5 %,the annual water cut rises by about 0. 7 %,recovery percent is 10. 5 %,and the formation pressure keeps high. The remaining oil in the reservoir is abundant,mainly concentrated at the intersection of rivers(the edge of rivers) and the micro-forward structure between wells. Through reservoir engineering demonstration,the reasonable formation pressure should be kept at 100 %,the reasonable injection-production ratio should be 1. 0,and the reasonable injection intensity should be 4. 9 m3/m·d.Technical policies should be adjusted from three aspects: border expansion,water injection and management of low production wells to improve reservoir development level.
Chang2 reservoir in Huaziping area Ordos Basin,which belonged to lowly infiltrates,lowly produces,low abundance. It is also called " three low" oil deposition. With the development of reservoir,the reservoir enters the high water cut stage,and the oil recovery capacity of the reservoir is declining continuously,so the development policy needs to be adjusted urgently. In this paper,Chang2 in Hua109 area is taken as the research object,to analyze reservoir development status,demonstrate different development schemes,and put forward corresponding development policies,by combining with actual production data and numerical simulation technology. The results show that: After years of development,the annual decline rate of reservoir is 9. 2 %,the water cut is 91. 5 %,the annual water cut rises by about 0. 7 %,recovery percent is 10. 5 %,and the formation pressure keeps high. The remaining oil in the reservoir is abundant,mainly concentrated at the intersection of rivers(the edge of rivers) and the micro-forward structure between wells. Through reservoir engineering demonstration,the reasonable formation pressure should be kept at 100 %,the reasonable injection-production ratio should be 1. 0,and the reasonable injection intensity should be 4. 9 m3/m·d.Technical policies should be adjusted from three aspects: border expansion,water injection and management of low production wells to improve reservoir development level.
引文
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[13]侯建锋,王友净,胡亚斐,等.特低渗透油藏动态缝作用下的合理注水技术政策[J].新疆石油天然气. 2016. 12(3):19-24.
[14]胡国强,胡书勇,李勇凯,等.低渗油藏注水开发五点井网有效驱替压力系统研究[J].油气藏评价与开发. 2017. 7(3):20-22.
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[16]朱光普,姚军,张磊,等.特高含水期剩余油分布及形成机理[J].科学通报. 2017(22):2553-2563.
[17]熊昕东,杨建军,刘坤,等.运用劈分系数法确定注水井单井配注[J].断块油气田. 2004. 11(3):56-59.
[2]王宝军.靖边采油厂渠树湾长2油层地质描述[D].西安石油大学. 2013.
[3]谢伟,王延锋,李红.鄂尔多斯盆地延长组长2油层组油气富集规律—以永宁油田任山区块为例[J].岩性油气藏. 2017. 29(5):36-45.
[4]彭晓清,龚福华,冯毓品,等.志靖安塞地区化子坪长2油层组油藏特征研究[J].长江大学学报:自科版. 2013. 10(8):31-33.
[5]杨俊杰.鄂尔多斯盆地构造演化与油气分布规律[M].北京:石油工业出版社. 2002.
[6]杨俊杰,李克勤,张东生,等.中国石油地质志:卷十二:长庆油田[M].北京:石油工业出版社. 1992.
[7]秦晓艳,武富礼,张志升,等.鄂尔多斯盆地化子坪地区延长组长6沉积特征及其与油藏分布关系探讨[J].重庆科技学院学报:自然科学版. 2010. 12(3):8-10.
[8]陈永胜.鄂尔多斯盆地姬塬地区延长组长2沉积相研究[D].长安大学. 2008.
[9]陈斐,魏登峰,余小雷,等.鄂尔多斯盆地盐定地区三叠系延长组长2油层组沉积相研究[J].岩性油气藏. 2010. 22(1):43-47.
[10]张保胜.姬塬油田长2油气富集规律研究[D].西安石油大学.2015.
[11]张兵,张春生,崔艳敏,等.胡尖山地区长2沉积相研究[J].内蒙古石油化工. 2007. 33(3):186-188.
[12]赵靖舟,蒙晓灵,杨县超,等.鄂尔多斯盆地蟠龙油田长2油层沉积相特征及其控油规律[J].石油天然气学报. 2005(1):54-56.
[13]侯建锋,王友净,胡亚斐,等.特低渗透油藏动态缝作用下的合理注水技术政策[J].新疆石油天然气. 2016. 12(3):19-24.
[14]胡国强,胡书勇,李勇凯,等.低渗油藏注水开发五点井网有效驱替压力系统研究[J].油气藏评价与开发. 2017. 7(3):20-22.
[15]闫伟超,孙建孟.微观剩余油研究现状分析[J].地球物理学进展. 2016. 31(5):2198-2211.
[16]朱光普,姚军,张磊,等.特高含水期剩余油分布及形成机理[J].科学通报. 2017(22):2553-2563.
[17]熊昕东,杨建军,刘坤,等.运用劈分系数法确定注水井单井配注[J].断块油气田. 2004. 11(3):56-59.
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