嫩二底油页岩标准层套损成因与防控方法
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摘要
大庆油田嫩二底标准层集中套损导致注采关系极不完整,地质储量难以有效动用,套损井治理修复难度大、周期长、费用高,严重影响油田开发效果和经济效益。分析嫩二底套损层位岩性力学特征、油页岩进水影响和地层压力差异等情况,揭示出嫩二底油页岩标准层因注水导致的地层不均匀沉降或隆起,诱发顶部嫩二底标准层剪切破坏套管。据此制定并实施了调整区域间压力平衡、控制地层孔隙压力骤变、防止标准层高压进水的防控措施。2014年以来,萨中开发区嫩二底油页岩标准层套损井数降幅达到72. 6%,嫩二底油页岩标准层套损防控措施成效显著。
The centralized casing damage of marker bed of Nen II bottom has led to the incomplete injection-production relationship,and it is difficult to effectively use geological reserves. The treatment and repair of casing damage is difficult,long period and high cost,which seriously affects the development effect and economic benefit of oil field. In this paper,it was deeply analyzed the characteristics of the lithologic mechanics,the influence of the oil shale and the difference of the pressure on the formation of the oil shale. The result showed that the reason of shearing casing damage in marker bed of Nen II was caused by uneven settlement or uplift induced by water injection. The prevention and control measures including adjust interregional pressure balance,pore pressure change control and preventing high pressure water from marker bed have been formulated and implemented. Since 2014,the number of casing damage wells in marker bed of Nen II of Sazhong development area has been decreased by 72. 6%. The controlling methods of casing damage in marker bed of Nen II oil shale strata have achieved remarkable results.
The centralized casing damage of marker bed of Nen II bottom has led to the incomplete injection-production relationship,and it is difficult to effectively use geological reserves. The treatment and repair of casing damage is difficult,long period and high cost,which seriously affects the development effect and economic benefit of oil field. In this paper,it was deeply analyzed the characteristics of the lithologic mechanics,the influence of the oil shale and the difference of the pressure on the formation of the oil shale. The result showed that the reason of shearing casing damage in marker bed of Nen II was caused by uneven settlement or uplift induced by water injection. The prevention and control measures including adjust interregional pressure balance,pore pressure change control and preventing high pressure water from marker bed have been formulated and implemented. Since 2014,the number of casing damage wells in marker bed of Nen II of Sazhong development area has been decreased by 72. 6%. The controlling methods of casing damage in marker bed of Nen II oil shale strata have achieved remarkable results.
引文
[1]许敬彦,李庆峰,丁明海.自然电位曲线异常原因分析[J].大庆石油地质与开发,2002,21(5):107-108.
[2]刘丽萍,殷建平,游迎东.应用荧光显微图像技术判断油页岩是否进水的方法[J].大庆石油地质与开发,2005,24(4):107-108.
[3]吴恩成,闫铁.大庆油田嫩二底标准层化石层引起套管损坏机理分析[J].大庆石油学报,2007,131(02):42-45,129.
[4]章根德,何鲜.油井套管变形损坏机理[M].北京:石油工业出版社,2005-07.
[5]刘建中,周胜民,李自平,等.油田套管损坏的压力与压差联合作用机制[J].石油勘探与开发,2001,28(2):97-99.
[6]王吉星.注水井套损的综合原因分析控制措施研究[D].东营:中国石油大学(华东),2012.
[7]郑志超.大庆油田南一区西部标准层套损与断层关系的新认识[J].中国石油和化工标准与质量,2017:37(16):144-144.
[2]刘丽萍,殷建平,游迎东.应用荧光显微图像技术判断油页岩是否进水的方法[J].大庆石油地质与开发,2005,24(4):107-108.
[3]吴恩成,闫铁.大庆油田嫩二底标准层化石层引起套管损坏机理分析[J].大庆石油学报,2007,131(02):42-45,129.
[4]章根德,何鲜.油井套管变形损坏机理[M].北京:石油工业出版社,2005-07.
[5]刘建中,周胜民,李自平,等.油田套管损坏的压力与压差联合作用机制[J].石油勘探与开发,2001,28(2):97-99.
[6]王吉星.注水井套损的综合原因分析控制措施研究[D].东营:中国石油大学(华东),2012.
[7]郑志超.大庆油田南一区西部标准层套损与断层关系的新认识[J].中国石油和化工标准与质量,2017:37(16):144-144.