Study On The Theory And Technology To Improve The Efficiency Of Oil-field Water Injection System

Oilfield water injection is the main measure to maintain the reservoir pressure. A large amount of water leads to that water injection investment accounts for a high proportion of production as well as most of China's current oil fields are in high water cut stage at present. Therefore, it is very important to improve the efficiency of water injection system for saving the cost of production. On the basis of previous studies, it is summarized that the mathematical model of basic units of the water injection system, established that the model of water injection system pipe network pressure and flow calculation, and solved through simple iterative method. It is established that the model of subsystem for centralizing water supply of pumping stations for multi-coupling large-scale pressure injection system according to the concept of decomposition of the pressure valley, and calculated through an example for the pressure distribution conditions. Based on Optimization Theory, it is established that mathematical models of injection pump operation optimization and optimal flow rate of pump station to run water injection station efficiently. Combined with Technology Economics, it is derived that relation expressions of the oilfield water injection pipe diameter and economic velocity, the structure of the water injection system pipe network planning methods, the establishment of an economic boost for the single-well evaluation model and the correlation of the water injection system efficiency and water flow according to water pipe characteristics on the basis of literature survey, and given that the correlation between the diameter and economic velocity. And a computer program is compiled to verify the models through a simple example.