海上高含水油井分段开采的选井方法应用研究
Study on application of well selection method for staged production of offshore high water cut oil wells
李丰辉 1孟令强 2李思达 3王彦利 2李彦来 1乐平 4张东1
作者信息
- 1. 中海石油(中国)有限公司曹妃甸作业公司,天津 300000
- 2. 中海石油(中国)有限公司湛江分公司,广东湛江 524000
- 3. 西南石油大学油气藏地质及开发工程国家重点实验室,成都 610500;中国石油集团测井有限公司地质研究院,西安 710000
- 4. 西南石油大学油气藏地质及开发工程国家重点实验室,成都 610500
- 折叠
摘要
海上边底水油藏一旦见水会迅速进入高含水阶段,而分段开采可以达到抑制高含水和延长油井寿命的目的.因此,可利用分段开采机理模型对含水上升影响因素进行敏感性分析,研究高含水油井分段开采的选井方法依据,并利用数值模拟方法进行验证.结果表明:1)底水油藏水平井含水上升影响因素敏感性大小排序为黏度＞高低渗级差＞高渗条带比例＞最大产液＞高渗段渗透率.2)根据生产动态、水平段地质资料及邻井资料将海上底水油藏高含水水平井见水模式分为线性见水全面水淹、点状见水局部水淹和多点见水全面水淹,其中点状见水局部水淹模式可进行分段开采.以典型井A1为例,利用所建选井方法流程判断含水率曲线为线状见水特征,开井含水高,水平段渗透率分段特征明显,Ⅲ-1小层水淹程度较高,A1井跟部水淹严重,且由于第1套夹层遮挡,A1井趾部水淹程度较低,为点状见水模式局部水淹,符合分段开采特征.3)针对点状见水局部水淹水平井,采用分段开采进行稳油控水,利用数值模拟方法模拟预测,分段开采方案开发较不分段方案产油量和采收率得到显著提升,验证了选井方法及分段开采的适用性.提出的选井方法流程可为现场水平井分段开采选井研究提供方法依据.
Abstract
The water body of offshore edge and bottom water reservoir has sufficient energy.Once water is seen in the production process,it will quickly enter the high water cut stage,seriously affecting the oil well productivity.At this time,it is necessary to select the oil wells suitable for staged exploitation,so as to achieve the purpose of re-straining high water cut and extending the oil well life through staged exploitation.Therefore,the sensitivity analy-sis of influencing factors of water cut rise is carried out by using the mechanism model of staged production,the basis of well selection method for staged production of high water cut oil wells is studied,and the numerical simulation method is used for verification.The results show that:1)Through the simulation of the mechanism of staged mining in the horizontal section,the mining effect of horizontal well development and the sensitivity relationship of the influ-encing factors of water cut rise are analyzed.The research shows that the order of the sensitivity of the influencing factors is:viscosity＞high-low permeability differential＞proportion of high permeability strip＞maximum liquid pro-duction＞permeability of high permeability section.2)According to the production performance,geological data of horizontal section and data of adjacent wells,the water breakthrough mode of high water cut horizontal wells in off-shore bottom water reservoirs is divided into linear full water breakthrough,point partial water breakthrough and multi-point full water breakthrough.The point partial water breakthrough mode can be exploited in sections.Taking typical well A1 as an example,the established well selection method and process can be used to judge that the water cut curve is linear water breakthrough,and the water cut in the well is high,The permeability of the horizontal sec-tion is characterized by obvious segmentation.The water flooded degree of sublayer Ⅲ-1 is relatively high,and the water flooded degree of the heel of well A1 is serious.The water flooded degree of the toe of well A1 is relatively low due to the shielding of the first set of interlayer.It is a local water flooded pattern of point water breakthrough,which is consistent with the characteristics of segmented mining.3)For the point shaped water breakthrough par-tially flooded horizontal wells,the staged exploitation is used to stabilize oil production and control water production.The numerical simulation method is used to simulate and predict that the oil production and recovery rate of the staged exploitation plan are significantly improved compared with those of the non staged plan,which verifies the ap-plicability of the well selection method and staged exploitation.The proposed well selection method flow can provide a method basis for the study of well selection for staged exploitation of horizontal wells in the field.
关键词
高含水/水平井/分段开采/选井/模拟分析Key words
high water cut/horizontal well/staged mining/well selection/simulation analysis引用本文复制引用
基金项目
四川省科技厅区域创新合作项目(2020YFQ0034)
出版年
2024
NETL
NSTL
维普
万方数据