Well Pattern Of Low Permeability Reservoir Distance And Effectively Utilized The Way Research

In the new proven oil reservoirs, low-permeability oil reservoirs account for a large proportion. Low-permeability reservoirs play an important role in China's petroleum industry, as important oil resource over a period of time in future, which helps to increase reserves and production. At the same time, the increasing price of the crude oil of the world which creates economic feasibility for low-permeability reservoir development.In this thesis, a large number of literatures concerning geological features,flow characteristics and development features of low-permeability reservoir have been investigated and summarized. As for the low-permeability oil reservoirs, its essential features are low permeability and owing the start-up pressure gradient which are different from conventional reservoirs. It is difficult to establish effective driving pressure system. So it is important to research reasonable well spacing.Base on the research of rational well spacing and well-pattern, by using numerical simulation method, researching on effective development modes including cycle water injection and gas injection different from the continuous water injection. In this research, the dynamic parameters and static parameters of reservoir have been analyzed. Simultaneously, we also analyze the sensitivity factors of influence displacement effect of WAG.And the mainly results of this project are as follows:(1)Considering the start-up pressure gradient, rectify the expression of technical limit well spacing, calculate the economical well spacing, thus the analysis method of rational well spacing thought the technical well spacing and the economical well spacing.(2)Using the numerical simulation method to research the well pattern of low permeability, propose the rational well pattern.(3)Using the numerical simulation method to research the unstable injection water flooding and the injection gas method, which contained the static and dynamic aspects, then give the results of the different cases. And it gives the analysis of the every case in this research; the results tell us that the former two methods have a better effecting than the continued water-flooding.So, it gives the methods and direction of the researching low-permeability reservoir in providing the formation energy, and the nature low-permeability reservoir can obtain the effective method of using hold the formation energy. On the other hand, it can provide the changed technology in the future of the typical reservoir of using contained injection water pattern, and there is a good basic of effective development of the low-permeability reservoir.