强底水礁灰岩L油藏水平井开发影响因素及效果评价研究

发布时间：2018-01-04 10:05

本文关键词：强底水礁灰岩L油藏水平井开发影响因素及效果评价研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：L油田是我国最大的大型强底水块状生物灰岩油田,储层裂缝、溶孔发育并被断层复杂化,具有相对致密、致密裂缝、孔隙孔洞和孔洞裂缝多种复杂储层类型。自1996年3月采用放射状水平井网投产以来,油田含水上升迅速,产量递减快,开发效果不理想。2010年～2016年期间,综合含水维持在95-98%之间,但截止2016年12月的采出程度仅11.51%。在已经投产的油井中,不同区域的油井含水上升速度存在明显差异,侧钻调整井效果不尽人意,且效果越来越差。因此,明确影响水平井开发动态的主控因素,对油田开发效果作出正确评价,对决策油田开发后期调整措施,改善油田开发效果具有重要的意义。本文在详细分析总结L油藏地质特征基础上,针对油藏开发中存在的问题,主要开展了以下研究并取得了相应的研究成果:(1)采用数值模拟方法,系统分析了影响L油藏开发效果的各个因素,获得了采收率与各因素的变化规律及函数关系式。(2)利用正交优化设计实验方法,研究了多因素共同作用下,各因素对采收率的影响程度,并运用matlab编程回归得到了强底水裂缝发育型与裂缝不发育型油藏采收率与各因素间的定量表征模型,提出了适合L油藏的、考虑储层纵向非均质性情况的采收率预测计算方法。(3)结合目标油田实际地质特征,分析了水平井生产动态特征及其产生的机理,为油田后续调整井布井、生产措施调整提供了依据。(4)依据生产动态分析结果,在对水平井控制区域储层类型归类的基础上,建立了适合于强底水礁灰岩油藏的开发效果评价关键指标体系,并对四种储层类型水平井的开发效果进行分类评价。(5)基于开发效果分类评价结果和生产动态分析结果,结合储层沿水平井段强非均质性特点,提出了改善L油田开发现状目前可行的调整措施为"对水平井段采用分段定最大流量、并尽量增大生产压差的方法,以提高水平井内低渗段的原油动用程度,达到降水增油的效果",并通过数值模拟方法验证了该措施的有效性。
[Abstract]:L oil field is the largest large bioglore oilfield with strong bottom water block in China. The reservoir fractures, dissolved pores and complicated by faults, are relatively compact and tight fractures. Since the radial horizontal well pattern was put into operation in March 1996, the water cut in the oilfield has risen rapidly and the production has decreased rapidly. From 2010 to 2016, the comprehensive water content was kept between 95% and 98%. However, as of December 2016, the recovery degree is only 11.51%. In the wells that have already been put into production, there are obvious differences in the water cut rise rate in different areas, and the effect of sidetracking adjustment wells is not satisfactory. And the effect is getting worse and worse. Therefore, the main control factors that affect the development performance of horizontal wells are defined, the development effect of oil field is evaluated correctly, and the adjustment measures for the later stage of oilfield development are made. It is of great significance to improve the development effect of oil field. Based on the detailed analysis and summary of geological characteristics of L reservoir, this paper aims at the problems existing in reservoir development. The following research has been carried out and the corresponding research results have been obtained. (1) numerical simulation method has been used to systematically analyze the factors that affect the development effect of L reservoir. The variation law of oil recovery and various factors and its function relation are obtained. (2) by means of orthogonal optimum design method, the influence degree of each factor on recovery is studied under the joint action of many factors. Using matlab programming regression, the quantitative characterization model of oil recovery and various factors in the reservoirs of strong bottom water fracture development and fracture undeveloped is obtained, and the suitable L reservoir is put forward. Considering the reservoir longitudinal heterogeneity, the method of oil recovery prediction and calculation. (3) combined with the actual geological characteristics of the target oil field, the production dynamic characteristics of horizontal well and its production mechanism are analyzed, which is the follow-up adjustment of well layout in oil field. The adjustment of production measures provides the basis for the analysis of production performance and classifies the reservoir types in the horizontal well control area. The key index system for evaluation of development effect of strong bottom water reef limestone reservoir is established. And the development effect of four reservoir types horizontal wells are classified and evaluated. (5) based on the development effect classification evaluation results and production performance analysis results, combined with the reservoir along the horizontal well Duan Qiang heterogeneity characteristics. The feasible adjustment measures to improve the present development situation of L oilfield are put forward: "adopting the method of determining the maximum flow rate in the horizontal well section and increasing the production pressure difference as far as possible, in order to improve the crude oil production degree of the low permeability section in the horizontal well." The effectiveness of the method is verified by numerical simulation.
【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】：TE243

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