杏十二区聚合物驱后期剩余油挖潜方式研究

发布时间：2018-03-22 19:11

本文选题：聚合物驱　切入点：历史拟合　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：剩余油分布规律研究及挖潜工作是油气田开发过程中必不可少的组成部分,是原油高效开采的有力保证。大庆油田大规模开展聚合物驱油以来,油田全过程跟踪调整技术中的宏观方向调整越来越受到关注,但同时对注聚后剩余油的定量描述还不是很深入,为了使聚合物驱的剩余油挖潜技术得到更深入的发展,本论文选择了萨尔图油田南部开发区某聚驱区块开展了聚驱开发后期剩余油及综合挖潜技术研究,利用数值模拟、注入采出井测井资料、密闭取芯资料及精细地质研究成果,分析聚驱开发后期平面上和垂向上宏观剩余油分布规律及沉积单元内部剩余油分布规律。提出不同类型剩余油挖潜技术和方法。对进一步提高聚合物驱的最终采收率,减缓聚驱后期含水回升速度,增加阶段产油量及油田的可持续发展有重要意义。同时也将为其它注聚区块指明研究思路和方向,提供技术支持和经验。本文取得如下认识与成果:1.水驱历史拟合,全区储量拟合相对误差为0.79%,含水率拟合绝对误差为绝对误差0.25%,采出程度绝对误差为0.24%;试验区储量拟合相对误差为0.47%,含水率拟合绝对误差为绝对误差0.12%,采出程度绝对误差为0.18%。2.聚合物驱阶段历史拟合,到2012年3月底,含水率拟合绝对误差为0.25%,采出程度拟合绝对误差为0.08%。3.对注聚后剩余油分布特征进行了研究,主流线上平均剩余油饱和度为0.2947,分流线上平均剩余油饱和度0.3146,分流线处剩余油饱和度比主流线处剩余油饱和度平均高0.0214,最高差0.0335。针对注聚后期剩余油主要分布在聚驱井网分流线处的情况,可以采用周期注聚方式挖潜分流线处的剩余油。4.分别对组合轮换式和线性周期注采方式4个月、6个月、8个月和10个月的开发效果进行了预测,计算结果表明,组合轮换式和线性周期注采方式注采周期6个月经济效益最好,两种开发方式聚驱阶段采出程度分别为11.20%和11.49%,净收益分别为1707.40万元和1266.00万元,组合轮换式收益更好。5.对组合轮换式和含水96%、98%转后续水驱的开发效果和经济效益进行了对比,结果表明组合轮换6个月比含水率96%、98%转后续水驱开发效果和经济效益都好。6.对组合轮换式注入强度对开发效果的影响进行了预测,计算结果表明,组合轮换周期为6个月,注入强度为原注入强度时开发效果和经济效益最好,此时聚驱阶段采出程度为11.20%,净收益分别为1707.40万元。7.对聚合物浓度对开发效果的影响进行了预测,计算结果表明,组合轮换周期为6个月,注入强度为原注入强度,聚合物浓度为1800mg/L时开发效果最好,此时聚驱阶段采出程度为11.31%,净收益分别为1820.69万元。
[Abstract]:The study on the distribution of residual oil and the tapping of potential are essential components in the process of oil and gas field development, and are the powerful guarantee for the efficient production of crude oil. Since the large-scale development of polymer flooding in Daqing Oilfield, The macro-direction adjustment in the whole process of oil field tracking and adjustment has been paid more and more attention, but the quantitative description of remaining oil after polymer injection is not very deep. In order to make the remaining oil potential tapping technology of polymer flooding get further development, In this paper, a polymer flooding block in the southern development zone of Saltu Oilfield was selected to study the remaining oil in the later stage of polymer flooding development and comprehensive tapping of potential. By using numerical simulation, well logging data of injection and production, sealing core data and fine geological research results, The distribution law of macroscopic remaining oil in plane and vertical direction and the remaining oil distribution in sedimentary unit in the later stage of polymer flooding are analyzed. The techniques and methods of tapping potential of different types of remaining oil are put forward. The final recovery of polymer flooding is further improved. It is of great significance to slow down the recovery rate of water cut in the later stage of polymer flooding, increase oil production and the sustainable development of oil fields. At the same time, it will also point out the research ideas and directions for other polymer injection blocks. To provide technical support and experience. This paper has obtained the following understanding and results: 1. Water drive history fitting, The relative error of reserve fitting in the whole area is 0.79, the absolute error of water content fitting is 0.25, the absolute error of recovery degree is 0.24.The relative error of reserve fitting is 0.47, the absolute error of water content fitting is 0.12, and the degree of recovery is absolute. The error is 0.18. 2. The history of polymer flooding stage is fitted. By the end of March 2012, the absolute error of water content fitting was 0.25 and the absolute error of recovery degree fitting was 0.08. 3. The distribution characteristics of residual oil after polymer injection were studied. The average remaining oil saturation on the main flow line is 0.2947, and the average remaining oil saturation on the distributary line is 0.3146. The remaining oil saturation at the distribution line is 0.0214 higher than the remaining oil saturation at the main stream line, and the maximum difference is 0.0335.The remaining oil mainly distributes in the later period of polymer injection. The situation at the distribution line of the polymer flooding network, It is possible to use the method of periodic polymer injection to excavate the remaining oil at the distribution line. The combined rotation method and linear cycle injection-production method are used to predict the development effect of 4 months, 6 months, 8 months and 10 months, respectively. The results show that, The combined rotation and linear cycle injection-production cycle have the best economic benefit in 6 months. The recovery degree of the two development methods in polymer flooding stage is 11.20% and 11.49% respectively, and the net income is 17.074 million yuan and 12.66 million yuan, respectively. 5. The development effect and economic benefit of combined rotation type and water cut 96% to follow up water drive are compared. The results show that the combined rotation for 6 months is better than the water cut of 96% and 98% for the subsequent water drive development. 6. The effect of the combined rotation injection intensity on the development effect is predicted. The calculation results show that the combined rotation period is 6 months. When the injection strength is the original injection strength, the development effect and economic benefit are the best, and the recovery degree is 11.20 and the net income is 17.074 million yuan, respectively. The influence of polymer concentration on the development effect is predicted, and the calculation results show that, The combination rotation period is 6 months, the injection intensity is the original injection strength, and the polymer concentration is 1800mg/L, the development effect is the best. At this time, the recovery degree of polymer flooding stage is 11.31, and the net income is 18.2069 million yuan respectively.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE327

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