牛圈湖油田“三低”砂岩油藏注水开发技术研究

发布时间：2018-10-18 19:01

【摘要】：随着我国油田开发的不断深入,低品位非常规砂岩在油田开发比例越来越大,由于该类油藏储层物性差,原始地层压力低,单井自然产量极低,开发难度大、成本高、稳产困难,一直未能实现储量升级和有效动用。牛圈湖油田西山窑组油藏属于低压、低渗、低流度的“三低”砂岩油藏,是三塘湖盆地第一个投入规模开发的油藏,也是目前三塘湖盆地生产的主力油藏。开发初期,牛圈湖油田西山窑组油藏采取了先期注水提高地层压力的技术思路投入开发,早期注水强度过大,造成油井投产初期低产液高含水井比例高;河道轴向水线推进快,侧向油井低液量,水流方向性明显;地层压力分布不均衡,沿砂体分布主向上能建立起有效的压力驱替,而侧向上不能建立起有效的压力驱替系统。本论文系统的研究了牛圈湖油田的地质特征,并对牛圈湖油田实施注水开发后,所出现的生产特征进行了分析,认为油藏水驱动用状况得到明显改善,自然递减、含水上升率得到有效控制,地层压力基本保持平稳,剖面动用程度得到一定提高,但剖面动用不均,层间吸水差异大,油干层吸水比例高没有得到彻底解决。综合分析开发效果较差的主要原因是注采井距太大,水驱控制程度低,直井单井控制储量低。为有效改善区块开发状况,提高区块单井产量,从油藏精细开发管理出发、对牛圈湖油田进行了精细油藏地质描述,掌握了剩余油的分布状况,同时在剩余油富集区域,有针对性的提出了井网加密调整和转变开发方式原则,并制定了相应的开发方案。通过进行精细注水、井网完善、油井增产及水平井开发等四方面开发调整技术的现场实施,油藏的开发效果得到了明显的改善,对于同类油藏的开发具有一定的指导意义。
[Abstract]:With the deepening of oilfield development in China, the proportion of low-grade unconventional sandstone in oilfield development is increasing. Due to poor reservoir physical properties, low original formation pressure, very low natural production of single well, high development difficulty and high cost, this kind of reservoir has the following advantages: poor reservoir physical property, low original formation pressure, low natural output, high development difficulty and high cost. Difficult to stabilize production, has not been able to achieve reserve upgrading and effective use. Xishanyao formation reservoir in Niuquanhu Oilfield is a "three low" sandstone reservoir with low pressure, low permeability and low mobility. It is the first reservoir in Santanghu Basin to be developed on a large scale and the main reservoir produced in Santanghu Basin at present. In the early stage of development, the Xishanyao formation reservoir of Niuquanhu Oilfield adopted the technical train of thought of raising formation pressure by water injection in advance. The high water injection intensity in the early stage resulted in a high proportion of low liquid and high water cut wells in the early stage of oil well putting into operation, and the axial waterway was advancing quickly. The lateral oil well has low fluid flow and obvious directional flow. The distribution of formation pressure is not balanced. The effective pressure displacement can be established along the main direction of sand body distribution, but the effective pressure displacement system can not be established on the side. In this paper, the geological characteristics of Niuquanhu oilfield are systematically studied, and the production characteristics of Niuquan Lake oilfield after waterflooding development are analyzed. It is concluded that the water driving condition of the reservoir is obviously improved and the natural decline is achieved. The water cut rise rate is effectively controlled, the formation pressure is basically kept stable, and the production degree of the profile is improved to a certain extent, but the uneven use of the section, the large difference of water absorption between layers, and the high water absorption ratio of the oil-dry layer have not been completely solved. The main reasons for the poor effect of comprehensive analysis and development are the large injection-production well spacing, the low degree of water drive control, and the low controlled reserves of single well in straight well. In order to improve the status of block development and increase the production of single well effectively, the fine reservoir geological description of Niuquanhu oil field is carried out, the distribution of remaining oil is mastered, and the remaining oil is enriched in the area of remaining oil enrichment, according to the fine reservoir development management. The principles of well pattern infill adjustment and development mode transformation are put forward, and the corresponding development scheme is worked out. Through the field implementation of four development adjustment techniques, such as fine water injection, well pattern perfection, oil well production increase and horizontal well development, the reservoir development effect has been obviously improved, which has certain guiding significance for the development of similar reservoirs.
【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】：TE357.6

【相似文献】