异常高压低渗透复杂断块油藏有效注水开发政策研究

发布时间：2018-03-12 16:09

本文选题：异常高压　切入点：低渗透　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：异常高压低渗透复杂断块油藏作为低渗透油藏的一种特殊类型,除具有常规油藏的特征之外,还具有应力敏感性强、存在启动压力梯度、储层物性差,非均质性严重,油藏边界类型复杂等特点。正确认识该类油藏的渗流机理和开发特征,制定合理的开发方案,对于高效开发该类油藏具有重要的指导意义。本文针对K1g3油藏目前注水开发动态中表现出的地层压力下降快、油井压力和产量下降快,水井注水压力高,日注水量低等问题,主要开展了以下几方面研究并取得了相应的成果： (1)K1g3油藏基本地质及开发特征再认识。利用油藏地质特征研究的报告、各种静态地质研究成果与测井解释结果等资料,运用沉积学与石油地质学的理论与方法开展地质特征再认识研究；利用油藏各种生产动态资料,总结归纳了目前开发过程所面临的问题。 (2)流体渗流机理实验研究。开展了①渗流启动压力梯度实验,得到了流度与渗流启动压力梯度的关系式。②应力敏感实验,得到了渗透率与有效应力的表达式。③渗透率级差与注采压差关系实验,得到了渗透率级差与高低渗透岩心流量比的曲线图。④注入水体系实验研究,得到了最优注入水体系。 (3)注水井吸水能力及提高吸水能力措施研究。利用现有注水井资料进行注水井动态分析,总结分析了注水开发过程中出现的问题及难点,并提出了相应的改善措施。 (4)应用油藏工程理论与方法,结合流体渗流机理实验研究结果,开展了油藏有效注水开发技术政策研究。①开展了合理注采井网井距研究,建立了考虑启动压力梯度和应力敏感的极限注采井距计算方法,得到了相应图版。②利用复杂断块油藏面积波及效率计算方法,得到了K1g3油藏各区块目前面积波及效率。③建立了渗透率级差对高低渗透层吸水能力影响的分析理论,并计算得到了注水井的纵向波及效率。④开展了合理注采压力系统研究,确定了油水井合理井底流压和油藏合理地层压力保持水平及转注时机。⑤推导了考虑应力敏感时油井产能公式,研究了不同地层压力保持水平对油井产能的影响规律,得到了相应图版。⑥分析评价了K1g3油藏各区块目前注采压力系统。
[Abstract]:As a special type of low permeability reservoir, abnormal high pressure and low permeability complex fault block reservoir is characterized by stress sensitivity, start-up pressure gradient, poor physical property and serious heterogeneity. Understanding the percolation mechanism and development characteristics of this kind of reservoir correctly and making a reasonable development plan have important guiding significance for the efficient development of this kind of reservoir. In this paper, the formation pressure, oil well pressure and production rate, water injection pressure and daily water injection rate of K1g3 reservoir are decreased rapidly, and the water injection pressure is high, and the daily water injection rate is low, etc, in view of the present water injection performance of K1g3 reservoir. Mainly carried out the following aspects of research and achieved corresponding results:. The basic geological and development characteristics of the K1g3 reservoir are rerecognized. The data of various static geological research results and log interpretation results are used in the study of reservoir geological characteristics. By using the theory and method of sedimentology and petroleum geology, the geological characteristics are studied again, and the problems in the development process are summarized by using the various production dynamic data of the reservoir. 2) Experimental study of fluid flow mechanism. 1. The stress sensitivity experiment of the relationship between fluid mobility and starting pressure gradient is obtained. The expression of permeability and effective stress is obtained. 3. The relationship between permeability differential and injection-production pressure difference is obtained. The experimental study on injection water system of curve .4 between permeability differential and flow ratio of high and low permeability core is obtained, and the optimal injection water system is obtained. Based on the existing data of water injection wells, the problems and difficulties in the process of water injection development are summarized and analyzed, and the corresponding improvement measures are put forward. 4) applying reservoir engineering theory and method, combining with the experimental results of fluid percolation mechanism, the effective water injection development technical policy of reservoir is studied. 1. The reasonable well spacing of injection-production well is studied. The calculation method of limit injection-production distance considering starting pressure gradient and stress sensitivity is established, and the method of calculating area sweep efficiency of complex fault block reservoir using the corresponding chart .2 is obtained. The present area sweep efficiency of each block of K1g3 reservoir is obtained. 3. The analysis theory of the influence of permeability differential on the water absorption capacity of high and low permeability layer is established, and the longitudinal sweep efficiency of water injection well is calculated. 4. The reasonable injection-production pressure system is studied. The reasonable bottom hole flow pressure and reasonable reservoir formation pressure maintenance level in oil and water wells are determined. The oil well productivity formula considering stress sensitivity is derived, and the influence of different formation pressure maintenance levels on oil well productivity is studied. The corresponding chart .6 is obtained to analyze and evaluate the current injection-production pressure system in each block of K1g3 reservoir.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6

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