大庆萨尔图油田南七区剩余油特征及井网调整研究

发布时间：2018-05-29 19:12

  本文选题：剩余油分布 + 系统调整　； 参考：《东北石油大学》2017年硕士论文

【摘要】：目前萨南开发区已全面进入高含水开发后期,一类油层大部分已进行三次采油开发,聚驱产量逐渐下降、水驱增储潜力越来越小、原油稳产的潜力主要集中在以二、三类油层为主的薄差层。大庆萨尔图油田南七区基础井网1965年投入开发,1985年进行了一次加密调整,1996年进行了二次加密调整,二次加密调整后区块可采储量增加,保持了区块稳产,改善了薄差油层的动用状况,初期取得了较好的开发效果。随着开采时间的延长,二次加密调整井含水上升速度加快,产量递减幅度大,压力系统不合理,注水方式不适应的矛盾日益突出。2000年二次加密调整井实施注采系统调整,采油井转注11口。2002年进行了三次加密调整。2011年为进一步改善区块开发效果,提高区块最终采收率,本文结合区块开发实际,在对区块剩余油成因及分布的基础上进行剩余油挖潜对策研究,对该区注采适应状况变差的井区继续开展注采系统调整工作,其研究成果为高含水期水驱油田稳产供理论依据,对于突破高含水期油层剩余油挖潜具有举足轻重的实践意义和现实借鉴价值。本文选取的研究对象是大庆萨尔图油田南部南七区二次加密及三次加密为对象以钻井、测井、取芯、等静态数据为基础建立剩余油模型,以吸水产液剖面、生产测井为衡量评价目前储层状态,以动态资料及套管状态进行单井挖潜研究。充分运用数值模拟注采关系评价方法,深化区块剩余油认识,借助前人研究理论、方法及成果,来构建南七区剩余油挖潜框架,总结区块剩余油分布特征及挖潜方向,综合评价区块剩余油水平。通过研究取得了如下结论和认识:1.将南七区主力油层萨、葡、高Ⅰ油层细分成110个沉积单元,建立了精细沉积格架。对主要7种沉积类型中井网控制的5种沉积类型进行研究,完成了区块的沉积相剖面图,为后续研究奠定了基础。2.将南七区部开采层位主要为萨至高Ⅰ共5个油层组,共统计108个小层。以小层作为模拟单元,模型纵向上划分为108个模拟单元,利用Petrel软件,将网格属性(孔隙度、渗透率、有效厚度)进行相控插值,得到的结果能够真实反映地层的变化趋势,为精细落实沉积体范围及剩余油分布奠定了基础。3.通过利用历年来油、水井的措施资料以及吸水产液剖面资料进行反复拟合,拟合地质储量为2891.473万吨,相对误差为0.28%,精度较高,为剩余油挖潜可行性提供基础。4.理论研究结果:注采井距过大,注水井启动压力越高,则不利于渗透率水平较低的薄差油层动用,因此确定在不进行加密调整的情况下,将区块的东西向相同井网注采井距调整为250m,南北方向二三次井网综合利用缩小注采井距为125m,构成五点法面积井网。5.研究表明平面上薄而稳定型三角洲砂体剩余油分布相对集中,是试验区区块调整挖潜的主要对象;纵向上剩余油分布在萨II组及萨III组中占区块剩余油的60%以上。6.研究表明该区块剩余油类型主要以油层动用差和注采不完善为主,这部分占剩余油砂岩厚度32.38%、有效42.50%,是该区块调整挖潜的主要对象。7.剩余油形成成因:葡差油层主要是由于纵向开发井段长,层间矛盾突出,下部油层动用差而形成的剩余油为主,在局部地区也存在一部分注采不完善型剩余油;萨差油层由于平面上注水井点少,注采关系不完善而形成剩余油。8.通过以细分层注水、精细堵水、补孔等相结合的方法完善单砂体注采关系,进而使得非主力油层的动用状况也得到明显改善,提高水驱控制程度,有效挖掘剩余油潜力,最终采收率有所提高,实现油田的可持续发展。
[Abstract]:At present, the southern development area of South China has fully entered the late stage of high water cut development. Most of the oil layers have been developed for three times. The output of polymer flooding is gradually decreasing and the potential of water flooding is becoming smaller and smaller. The potential of crude oil production is mainly concentrated in the thin layer with two and three types of oil. The basic well network in the South seven District of Daqing Saertu oilfield was developed in 1965. In 1985, an encryption adjustment was carried out, two encryption adjustment was carried out in 1996, the recoverable reserves of the block were increased after the two encryption adjustment, the stable production of the block was maintained, the moving status of the thin oil layer was improved, and the development effect was better in the early stage. With the extension of the mining time, the water cut rate of the two encrypted adjustment wells was accelerated and the output decreased. Large amplitude, unreasonable pressure system and incompatibility of water injection mode, the two time encryption adjustment well was adjusted in.2000 year, and three times of encryption adjustment for 11.2002 years was carried out for.2011 years to further improve block development effect and improve the final recovery of block. On the basis of the cause and distribution of residual oil, the Countermeasures of remaining oil digging are carried out, and the adjustment work of injection production system is continued to be carried out in well area with poor adaptability in this area. The research results provide theoretical basis for stable production of water flooding oil field in high water cut period, and have important practical significance and present significance for breaking through the remaining oil in high water cut stage. The object of this study is to establish the remaining oil model on the basis of two encryption and three encryption in the South South seven area of southern Daqing oil field, based on the static data such as drilling, logging, core extraction and other static data. The reservoir is measured by the water absorption section, and the production logging is used to evaluate the current reservoir state, and the single well is carried out with dynamic data and casing state. In order to make full use of the evaluation method of numerical simulation injection and production relations, deepen the understanding of the remaining oil in the block, build the remaining oil digging framework in the South seven area with the help of previous research theories, methods and achievements, sum up the distribution characteristics of the remaining oil in the block and the direction of potential digging, and comprehensively evaluate the remaining oil level in the block. The following conclusions and knowledge are obtained through the study: 1. The fine sedimentary framework was established by subdividing the main oil layer of the main oil layer in the South seven area into 110 sedimentary units. The 5 sedimentary types of the main 7 types of sedimentary types were studied, and the sedimentary facies profile of the block was completed, which laid the foundation for the follow-up study by.2., the main mining beds in the South seven areas were mainly 5 of the height of Sooi. There are 108 small layers in the reservoir. The small layer is used as a simulation unit, and the model is divided into 108 simulation units vertically. Using the Petrel software, the grid attributes (porosity, permeability and effective thickness) are interpolated by phase control. The results can truly reflect the trend of formation change, and lay the foundation for the fine implementation of the range of sedimentary bodies and the distribution of remaining oil. Based on the repeated fitting of the past year's oil, water well measures and water absorption profile data, the foundation.3. fits the geological reserves of 28 million 914 thousand and 730 tons, the relative error is 0.28% and the precision is high, which provides the basic.4. theory research results for the feasibility of the remaining oil digging potential: the higher injection production well distance and the higher starting pressure of the injection well are not favorable. The thin oil layer with low permeability is used. Therefore, it is determined that the well spacing of the block is adjusted to 250m with the same well net injection well spacing in the case of no encryption adjustment, and the two or three well network in the north-south direction is 125m, and the five point method of area well network.5. research shows thin and stable delta sand body on the plane. The remaining oil distribution is relatively concentrated, which is the main object of adjusting and digging potential in the test area. The longitudinal residual oil distribution in the II group and the saaa III group accounts for more than 60%.6. of the remaining oil in the block, which shows that the main types of remaining oil in the block are mainly used in the oil formation and injection production, which accounts for 32.38% of the remaining oil sandstone and 42.50% of the remaining oil. The main object of.7. remaining oil formation in this area is the formation of the remaining oil, which is mainly due to the lengthwise development of the well section long, the interlayer contradiction is prominent, the remaining oil is mainly formed in the lower oil layer, and a part of the incomplete injection and production remaining oil is found in the local area, and the injection production relation is not related to the water injection well point on the plane. In order to improve the formation of residual oil.8., the injection production relationship of single sand body is improved by means of subdivision layer water injection, fine water plugging and hole filling, which can improve the dynamic use of non main oil layers, improve the control degree of water flooding, effectively excavate the potential of residual oil, improve the final recovery rate, and realize the sustainable development of the oil field.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE327
，

本文编号：1952064