特高含水油藏深部调剖技术界限研究

发布时间：2018-05-11 04:10

本文选题：特高含水油藏 + 优势通道　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：注水井深部调剖是非均质油藏控水稳油、提高水驱采收率的重要手段。我国绝大多数油田都进入了高含水或特高含水开采期,非均质性严重,长期的注水冲刷、反复射孔换层和部分井组及区块的强注强采,使得纵向、平面和层间渗透率差异进一步加剧,深部调剖工艺的难度越来越大,实施效果越来越差,常规的堵水调剖技术已经不能满足油田生产的各种需求。深部调剖技术在特高含水期油藏应该有一定的适应性和应用范围,然而目前国内外还没有开展深部调剖技术界限这一方面的研究。在分析特高含水油藏深部调剖效果变差原因的基础上,确定了影响深部调剖效果的地质因素和开发因素等技术指标,建立物理实验模型,以分流比作为评价指标,评价了常用调剖体系对吸水剖面的改善程度,为数值模拟提供了参数支持。实验结果证明了冻胶和颗粒类等堵剂的封堵特点和改善吸水剖面的能力,其中冻胶堵大优于堵小、颗粒类堵剂堵小优于堵大,为堵剂矿场应用选择提供了依据。利用数值模拟方法建立了符合中高渗透油藏地质特征的概念模型,根据模拟结果制定了特高含水油藏深部调剖技术界限图版,其中原油粘度小于5 mPa·s和渗透率级差小于2的油藏均不适合深部调剖;调剖时机越早越好;含水率在90%~95%时,封堵半径大约在0.4~0.6之间效果较好;含水率在95%~98%时,封堵半径大约在0.6~0.8之间效果较好。利用特高含水区块的48个井组调剖结果验证了所确定的深部调剖技术界限准确性。该研究成果分别在胜坨油田T1433区块STT143X29井组和T28断块ST3-6-09井组进行了应用验证,证明了所建理论图版是正确的,为特高含水油藏深部调剖选井选层决策提供了一条可行的捷径。
[Abstract]:Deep profile control in water injection wells is an important means to control water and stabilize oil and improve water flooding recovery. Most oil fields in China have entered the period of high water cut or extra high water cut, with serious heterogeneity, long term flooding and scouring, repeated perforation change and strong injection and strong production of some well groups and blocks, resulting in longitudinal, The difference between plane and interlayer permeability is further aggravated, the deep profile control process is becoming more and more difficult, and the effect is getting worse and worse. The conventional water plugging and profile control technology can no longer meet the needs of oilfield production. Deep profile control technology should have a certain adaptability and application scope in ultra-high water-cut reservoirs. However, there is no research on deep profile control technology limits at home and abroad. Based on the analysis of the reasons for the deterioration of deep profile control effect in ultra-high water-cut reservoirs, the technical indexes such as geological factors and development factors affecting the deep profile control effect are determined, and the physical experimental model is established, and the distributary ratio is taken as the evaluation index. The improvement of water absorption profile by common profile control system is evaluated, which provides parameter support for numerical simulation. The experimental results show that the plugging characteristics of gel and granular plugging agent and the ability to improve the water absorption profile are proved. The large gel plugging is better than the small plugging, and the particle plugging agent is better than the plugging one, which provides the basis for the selection of plugging agent field. Based on the numerical simulation method, a conceptual model which accords with the geological characteristics of medium and high permeability reservoirs is established. According to the simulation results, the deep profile control technical boundary charts of ultra-high water cut reservoirs are worked out. The oil reservoirs with oil viscosity less than 5 mPa s and permeability difference less than 2 are not suitable for deep profile control. The earlier the profile control time is, the better. When water cut is between 90 and 95, the plugging radius is about 0.4 ~ 0.6, and the water cut is 95 ~ 98. The plugging radius is about 0.6 ~ 0.8 and the effect is better. The profile control results of 48 well groups in ultra-high water cut blocks are used to verify the accuracy of the technical limits of deep profile control. The research results have been applied to STT143X29 well group and T28 block ST3-6-09 well group in Shengtuo Oilfield, respectively. It is proved that the theoretical chart is correct and provides a feasible shortcut for the decision of deep profile control and reservoir selection in ultra-high water cut reservoir.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6

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