Concurrent-Separate Constant Pressure Water Injection Design Optimization Technique Considering the Threshold Pressure Gradient

A new complex technique for optimizing the design of concurrent-separate constant pressure water injection (CSI), considering the threshold pressure gradient, is proposed. First, the regularity of the each production unit water omnidirectional movement was determined based of the constructed 3D-geological model of the studied field object, and then the critical values of the inefficient water injection into multilayer formations process indicators were calculated based on the obtained data. Second, using an intelligent borehole monitoring and control system, the threshold pressure of water injection into the productive reservoir was determined and CSI special blanks were constructed under constant pressure, taking into account the threshold pressure gradient in injection wells. Third, a procedure has been developed for determining the optimal water injection pressure of each production facility into the productive reservoir during the development of multilayer oil fields. The application of the proposed technique for optimizing the CSI design under constant pressure is by an example of field data from the Daqing oil field of the People's Republic of China (PRC). The calculation results show that the injected under the constant pressure water efficiency factor value increased significantly by 8.6% due to the sensible separation of the volume of water injected into the productive reservoir. The proposed technique may be useful for CSI designing optimization on other oil fields.