低渗透油藏不同开采条件下的增油机理及应用技术研究

发布时间：2018-03-30 10:16

本文选题：低渗透储层　切入点：超前注水　出处：《西安石油大学》2017年硕士论文

【摘要】：低渗透油田开发过程中会遇到很多的困难。在开采初期,区块处在低含水阶段,仅靠地层的天然能量进行开采,油井产量开始高,随着开采的进行,产量与地层压力快速下降。为了补充地层能量,之后油田采用注水开发,随着区块含水率逐渐上升,特别是进入中高含水期后,油井采油量仍然不高,同时注水井会出现注水量剧减的情况。针对上述问题,本文主要提出了如下解决方案:(1)本文以冀东油田A区储层为例,总结了该区块的静态和动态资料。针对低含水阶段油井产量、地层压力快速下降的问题,采用超前注水的开发方式进行解决。为了研究低渗透油田进行超前注水开发的增油机理,采用了油藏数值模拟的方法,建立了超前注水开发的机理模型,分别研究了不同的井网类型、注水时机、地层渗透率、井距、排距对超前注水开发效果的影响。最后结合正交试验设计原理与层次分析法,确定了一种同时考虑多个因素、多个目标的优法方法,并以冀东油田A块为例,确定其最优的超前注水开发方案。(2)当低渗透油田的开发进入到中高含水阶段后,储层的非均质性增强,油井产油量大幅下降,注水井注水困难,为了解决这些问题,考虑对地层进行压裂改造。为了研究低渗透油藏在中高含水阶段压裂开发的增油机理,建立了压裂开发的机理模型,采用油藏数值模拟手段,研究了不同的压裂井别、地层渗透率、裂缝导流能力、裂缝半长对压裂开发效果的影响。基于前文的优化方法,以冀东油田A区块为例,确定其最优的压裂开发方案。本文研究说明,低渗透油田为了提高开发效果,可以在低含水阶段对区块进行超前注水开发,在中高含水阶段采用地层压裂的手段进行开发,这为同类油田的开发提供了借鉴思路。
[Abstract]:In the early stage of exploitation, the block is in the stage of low water cut and only depends on the natural energy of the formation. The oil well production begins to be high, and as the exploitation goes on, In order to replenish the formation energy, the oilfield uses water injection to develop. With the water cut of the block rising gradually, especially after entering the middle and high water cut period, the oil well production rate is still low. In view of the above problems, this paper mainly puts forward the following solution: 1) this paper takes the reservoir in area A of Jidong Oilfield as an example. The static and dynamic data of the block are summarized. In order to study the oil increasing mechanism of advanced water injection in low permeability oil fields, the reservoir numerical simulation method is adopted, and the mechanism model of advanced water injection development is established. The effects of different well pattern types, injection timing, formation permeability, well spacing and spacing on the development effect of advanced water injection are studied respectively. Finally, combined with the design principle of orthogonal test and analytic hierarchy process, it is determined that several factors are considered at the same time. Multiple target optimization methods, and taking block A of Jidong Oilfield as an example, it is determined that its optimal water injection development plan is. (2) when the development of low permeability oil fields enters the stage of medium and high water cut, the heterogeneity of the reservoir increases and the oil production of the oil wells decreases substantially. In order to solve these problems, fracturing is considered. In order to study the oil increasing mechanism of fracturing in low permeability reservoir at the middle and high water cut stage, the mechanism model of fracturing development is established. The effects of different fracturing well types, formation permeability, fracture conductivity and fracture half-length on fracturing development effect are studied by using reservoir numerical simulation. Based on the optimization method mentioned above, A block in Jidong Oilfield is taken as an example. In order to improve the development effect, in order to improve the development effect, the low permeability oilfield can develop the block by water injection in the low water cut stage, and the formation fracturing method can be used in the middle and high water cut stage. This provides a reference for the development of similar oilfields.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE348;TE357

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