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基于储层特性的碳酸盐岩缝洞型油藏开发方式
袁士宝,刘文强,蒋海岩,赵黎明,王姣
0
(1.西安石油大学石油工程学院,陕西西安710065;2.陕西省油气田特种增产技术重点实验室,陕西西安710065;3.陕西延长石油(集团)研究院,陕西西安710075;4.中国石化西北油田分公司采油一厂,新疆乌鲁木齐830011)
摘要:
碳酸盐岩缝洞型油藏由于具有横、纵向非均质性极强的特点,采用常规注采井网开发产量低,经济效益不佳。目前中外学者已经提出了多种适用于该类油藏的开发方式,但仍未提出一套较为系统的碳酸盐岩缝洞型油藏开发方式优选流程。为了更精准地选择碳酸盐岩缝洞型油藏的开发方式,提高该类油藏的采收率和实际经济效益,以A区块为例,运用数值模拟手段,综合分析不同开发方式在不同油藏性质、储层构型上的适用性。结果表明:在中小规模缝洞体密集部位采用水平井可以获得更高产量和经济效益。油藏基质渗透率低时采用小规模的“定点开发”比面积井网更有效;连通缝洞体注水开发比衰竭式开发最终采收率高;单独缝洞单元注水替油或注气吞吐均可成为能量补充的有效方式。最终提出了依次分析缝洞体规模、基质渗透率及缝洞体连通性来优选该类油藏开发方式的思路。
关键词:  碳酸盐岩  缝洞型油藏  开发方式  注水替油  数值模拟
DOI:10.13673/j.cnki.cn37-1359/te.2021.01.010
基金项目:国家自然科学基金项目“基于燃料沉积演化及制度火烧油层启动与控制”(51674198)。
Investigation into development modes of fracture-cavity carbonate reservoirs based on reservoir characteristics
YUAN Shibao,LIU Wenqiang,JIANG Haiyan,ZHAO Liming,WANG Jiao
(1.School of Petroleum Engineering,Xi’an Shiyou University,Xi’an City,Shaanxi Province,710065,China;2.Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs,Xi’an City,Shaanxi Province,710065,China;3.Research Institute of Yangchang Petroleum(Group)Co.,Ltd.,Xi’an City,Shaanxi Province,710075,China;4.No.1 Oil Production Plant of Northwest Oilfield Branch,SINOPEC,Urumqi,Xinjiang,830011,China)
Abstract:
Fracture-cavity carbonate reservoir is characterized by strong horizontal and vertical heterogeneity,and the conventional injection-production well pattern has low production and poor economic benefits. At present,scholars have proposed a variety of development modes suitable for this kind of reservoirs,but they have not put forward a set of systematic optimization process for the development modes of fracture-cavity carbonate reservoirs. In order to select the development modes of fracture-cavity carbonate reservoirs more accurately and improve the recovery and actual economic benefits,this article takes a typical fracture-cavity carbonate reservoir(Block A)for example,and comprehensively analyzes the applicability of different development modes in reservoirs with different properties and configurations of by numerical simulation. The results show that the horizontal well can achieve a higher production rate and better economic benefits in dense parts of small-and medium-scale fracture-cavity bodies. Specifically,small-scale“fixed-point development”is a more effective development mode than areal pattern well in reservoirs with low matrix permeability. The water-flooding development of connected fracture-cavity bodies has a higher ultimate recovery than the depletion development. Both water-flooding and gas huff and puff can be effective ways of energy supplement. Finally,the idea of optimizing the development mode of this kind of reservoirs is put forward through analysis of the scale,matrix permeability,and connectivity of the fracture-cavity body.
Key words:  carbonate  fracture-cavity reservoir  development mode  water injection for oil  numerical simulation

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