C9低渗透油藏注空气开发可行性研究

发布时间：2018-01-05 07:32

本文关键词：C9低渗透油藏注空气开发可行性研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

更多相关文章： 低渗透 轻质油藏 注空气 数值模拟

【摘要】：C9井区西山窑组油藏渗透率平均为10mD,属于低渗透油藏,该区微裂缝发育。自从1993年开始进行注水,经过20多年的开发,油田经历了产能建设阶段、高产稳产阶段、快速递减阶段、加密调整阶段和综合治理阶段。目前油田暴露出许多问题:油田注采井之间没能形成有效的驱替系统,注不进采不出矛盾突出,导致压力场分布不均。为缓解注采矛盾该区进行了小井距加密试验,由于油井压裂沟通次生底水导致采油井高含水,小井距开发效果不佳,开发形势严峻。首先,针对上述问题,进行了注空气驱可行性分析。从油藏流体条件与注空气筛选标准的匹配度,隔层条件防止层间气窜的适应性,地层构造倾角的适应性,岩矿组成对低温氧化反应的影响等方面进行分析,认为该区域均符合注空气开发的有利条件。其次,数值模拟预测挖潜潜力。根据前人对该区域的微裂缝预测,建立带有裂缝系统的双重介质地质模型和数值模型,结合生产动态数据,利用示踪剂资料,根据不同层的见剂方向调整小层油水井间的渗透率,对单井及全区的含水、产油量等指标进行拟合,得到符合真实地层的地质模型。通过数值模拟计算得到各小层的剩余可采储量及剩余油分布。剩余油分布表明J2X12-2、J2X13-1的含油饱和度较高,J2x13-2、J2X14层水淹程度较高,预测剩余可采储量21.6×104t,具有进一步挖潜的潜力。最后,建立空气驱数值模型,对注气参数进行优化。数值模拟结果表明:注空气开发明显优于注水开发;由于构造倾角较小,高低部位注气对后期累产量有影响;水气交替周期长短对产油量的影响不大;通过对注气量的优选,单井注气量在22000m3/d时换油率最高,建议单井注气量在22000m3/d左右最佳;空气中氧含量越高,累产油量越大,为了兼顾安全生产,同时获得最大累产油量,考虑减氧至10%进行生产。同时,经济评价表明选择单井注气量在22000m3/d开发时,区块在第二年即可收回成本,空气驱开发可以获得较大利润。
[Abstract]:C9 well area of Xishanyao reservoir average permeability is 10mD, which belongs to low permeability reservoir, the micro crack growth. Since the beginning of 1993 water, after 20 years of development, has experienced the oil production capacity construction stage, production stage, rapid decline stage, encryption adjustment stage and comprehensive treatment stage. At present oil exposed many problems between the oil well can not form effective system for flooding, injection production no contradiction, resulting in pressure field distribution. In order to alleviate the contradiction between the injection production well spacing test area of encryption, because communication leads to fracturing secondary bottom water high water cut wells, well spacing development effect is poor, development the situation is grim. Firstly, aiming at the above problems, this paper presents a feasibility analysis of flooding from the air. The matching degree of reservoir fluid conditions and air injection screening criteria, the interlayer conditions to prevent gas channeling layer formation adaptability. Make angle of adaptability, the mineral composition of low temperature oxidation were analyzed in this region are in line with the favorable conditions of air injection development. Secondly, the numerical simulation. According to the previous prediction of tapping the potential of micro cracks in the region, the establishment of dual medium geological model and numerical model with fracture system, combined with the production dynamic data, using the tracer data, according to the different layer see direction adjustment layer agent between oil and water well permeability, water content of single well and the index, oil production by fitting with the geological model of the real formation. Through the numerical simulation of residual layer of the small recoverable reserves and remaining oil distribution are calculated. J2X12-2 showed that the distribution of remaining oil, J2X13-1 J2x13-2, J2X14 high oil saturation, watered out degree of prediction of remaining recoverable reserves of 21.6 * 104t, with further tapping potential finally. The establishment of air, flooding numerical model of gas injection parameters were optimized. The numerical simulation results show that the air injection development is obviously better than that of water flooding; because the construction of a small dip, or parts of gas injection on the late tired yield effect; influence of water alternating cycle oil production is not large; by optimization of gas injection rate, single well gas injection in 22000m3/d oil was the highest, that of single well gas injection best at about 22000m3/d; the higher the oxygen content in the air, the greater the amount of cumulative production, in order to take into account the safety in production, and get the maximum cumulative production to 10%, considering the reduced oxygen production. At the same time, the economic evaluation shows that the choice of single well gas injection in 22000m3/d the development, in second years to recover the cost of the block, air flooding can obtain greater profits.

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.7

【相似文献】