牛心坨裂缝性储层深部调剖技术研究

发布时间：2018-01-14 15:32

本文关键词：牛心坨裂缝性储层深部调剖技术研究　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：牛心坨油层属于低渗透裂缝性高凝油油藏。经过多年的注水开发,目前已进入注水开发的中高含水开发阶段,吸水剖面、产液剖面持续恶化,层间、层内开发矛盾加剧,低渗透层难动用,含水继续上升,产量快速递减。为了改善油田水驱开发效果,需要开展适合牛心坨裂缝性油藏的深部调剖技术研究,有效地封堵大孔道,扩大注入水的波及体积,从而提高水驱效率,达到提高采收率的目的。因此研究深部调剖技术及其在牛心坨油田的应用具有重要的意义。本文针对牛心坨裂缝性储层的地质特点,通过室内实验,结合以往配方的优缺点,提出改进方案;对新配方中交联剂的类型及浓度进行筛选;通过分析温度、pH值、矿化度等影响因素,优化了交联剂浓度、添加剂种类和浓度,确定了能够有效改善注水井吸水剖面的深部调剖剂配方,并对该调剖剂配方体系进行了热稳定性、抗剪切性及抗盐性能评价;通过室内岩心模拟实验,评价了深部调剖体系对岩心的封堵性,并对调剖剂段组合塞进行优化。实验结果表明,所研制的深部调剖剂最佳注入体积为0.2PV;选择两种凝胶分段塞组合在一起的调剖段塞组合工艺;岩心封堵率达到了97%以上,封堵效果良好。
[Abstract]:Niu Xintuo reservoir belongs to low permeability fractured high condensate oil reservoir. After many years of water injection development, it has entered the stage of high water cut development, water absorption profile, liquid production profile continues to deteriorate, and interlayer. In order to improve the development effect of water drive in oil field, the deep profile control technology suitable for Niuxintuo fractured reservoir needs to be studied in order to improve the development effect of oil field water drive, the low permeability layer is difficult to be used, the water cut continues to rise and the production decreases rapidly. The large pore channel is effectively sealed, and the sweep volume of injected water is expanded, thus improving the efficiency of water flooding. Therefore, it is of great significance to study the deep profile control technology and its application in Niuxintuo Oilfield. According to the geological characteristics of Niuxintuo fractured reservoir, laboratory experiments are carried out in this paper. According to the advantages and disadvantages of the former formula, the improvement scheme is put forward. The type and concentration of crosslinker in the new formulation were screened. By analyzing the influence factors of temperature and pH value, salinity and so on, the concentration of crosslinking agent, the type and concentration of additive are optimized, and the formula of deep profile control agent which can effectively improve the water absorption profile of water injection well is determined. The thermal stability, shear resistance and salt resistance of the profile control agent were evaluated. The plugging performance of the deep profile control system to the core is evaluated through the laboratory core simulation experiment, and the combination plug of the profile control agent section is optimized. The experimental results show that. The optimum injection volume of deep profile control agent is 0.2 PV. Two kinds of gel segmental plug combination process are selected. The plugging rate of core is more than 97%, and the plugging effect is good.
【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】：TE348

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