杏一～三区西部Ⅱ块3~#站及4~#站聚合物驱提效率试验~

发布时间：2019-06-14 20:34

【摘要】：杏北开发区一类油层地质储量22460×104t,2002年开始开展工业化聚合物驱以来,已经有10个工业化聚驱区块,聚驱储量已经达到8111.9×104t,目前未开展三次采油的地质储量为14348.1×104t。大庆长垣北部油田一类油层聚合物驱已基本结束,聚驱提高采收率在10个百分点以上。目前,北部油田聚合物驱的主要开采对象为二类油层。从已开展聚驱区块的开发效果看,普通聚合物驱能够比水驱多提高采收率10个百分点以上,但由于油层非均质性的影响,中低渗透层动用状况相对较差,注聚期间有效厚度连续动用比例仅为55%左右,低效无效循环的矛盾在注聚中后期不断加剧,聚合物用量增加,聚驱开发效益变差;注入困难井增加、增注措施效果变差等矛盾加大了注聚中后期跟踪调整的难度。目前聚合物驱技术的发展方向为:研究聚合物驱注入参数的油层适应性、不同分子量不同浓度多段塞组合的驱油效果,研究控制聚合物驱成本投入、提高聚合物驱油效率和经济效益的有效方法。针对杏一~三区西部125m井距聚驱区块非均质性严重,压力上升速度慢、聚合物突破快、油层动用状况差的特点,为了最大幅度的提高采收率,降低化学剂投入成本,选择杏一~三区西部Ⅱ块3#、4#站开展聚驱提效率试验,通过优化驱油方案设计,深化跟踪调整技术、规范措施技术流程等研究,发展和完善聚驱提效率的技术方法,指导今后聚合物驱区块的开发调整。本文对研究区进行了油藏精细描述、确定了最小尺度个性化设计的技术界限,研究了最及时有效的跟踪调整方法,完善了完善聚驱各项制度。试验结果表明,与杏一~三区西部Ⅱ块1#、2#站对比,节约聚合物干粉用量13.3%,油层动用程度提高6.7个百分点,多提高采收率1.09个百分点,技术经济效果较好,具有广阔的应用前景。
[Abstract]:The geological reserves of the first class of reservoirs in Xingbei Development Zone are 22460 脳 10 ~ 4 t. Since the industrial polymer flooding was carried out in 2002, there have been 10 industrial polymer flooding blocks, and the polymer flooding reserves have reached 8111.9 脳 10 ~ 4 t. At present, the geological reserves of the tertiary oil recovery are 14348.1 脳 10 ~ 4 t. Polymer flooding in the first class of reservoirs in the northern Changyuan Oilfield of Daqing has basically ended, and the enhanced recovery of polymer flooding is more than 10 percentage points. At present, the main production object of polymer flooding in northern oil field is type II reservoir. According to the development effect of polymer flooding block, ordinary polymer flooding can improve oil recovery by more than 10 percentage points than water flooding, but due to the influence of reservoir heterogeneity, the production condition of middle and low permeability layer is relatively poor, and the continuous production ratio of effective thickness during polymer injection is only about 55%. The contradiction of inefficient and ineffective cycle is aggravated in the middle and late stage of polymer injection, and the polymer dosage increases and the development benefit of polymer flooding becomes worse. The contradiction such as the increase of injection difficult wells and the poor effect of injection measures make it more difficult to track and adjust in the middle and late stage of polymer injection. At present, the development direction of polymer flooding technology is to study the reservoir adaptability of polymer flooding injection parameters, the oil displacement effect of different molecular weight and different concentrations of multi-slug combination, and the effective methods to control the cost input of polymer flooding and improve the efficiency and economic benefit of polymer flooding. In view of the characteristics of serious heterogeneity, slow pressure rise, fast polymer breakthrough and poor reservoir production in the 125 m well distance polymer flooding block in the west of Xing1 ~ 3 district, in order to maximize oil recovery and reduce the input cost of chemical agent, 4 # station was selected to carry out the test of polymer flooding extraction efficiency, and by optimizing the design of oil displacement scheme, deepening the research of tracking and adjusting technology and standardizing the technical flow of measures, etc. To develop and perfect the technical methods of polymer flooding efficiency and guide the development and adjustment of polymer flooding blocks in the future. In this paper, the reservoir fine description in the study area is carried out, the technical limits of the minimum scale personalized design are determined, the most timely and effective tracking and adjustment methods are studied, and the various systems of polymer flooding are improved. The test results show that compared with block II and station 2 in the west of Xingyi ~ 3 district, the consumption of polymer dry powder is saved by 13.3%, the reservoir production degree is increased by 6.7%, and the oil recovery is increased by 1.09%. The technical and economic effect is better and has a broad application prospect.
【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】：TE357.46

【相似文献】