Establishment and Evaluation of Effective Driving Pressure System in Rectangular Nine-spot Pattern
For rapid production decline, difficult production maintenance capability in low permeability reservoirs, and pressure transmission discipline between injection and production wells, effective driving pressure system is proposed. An effective driving pressure system can supplement enough energy to layer on time to control production decline. Pressure drop at a point in infinite rectangular nine-spot pattern is simplified into pressure drop overlay of four closed rectangular reservoirs by mirror image and inverse mirror image theory. Layer pressure of a well with uniform flux fracture in the center of a closed rectangular reservoir is gained by integrating two-dimensional instantaneous source function. Fractured well’s B.H.P (bottom hole pressure) in infinite nine-spot pattern is gained by pressure overlay while injection and production wells work at the same time. The method of establishing and the model of evaluating effective driving pressure system are gained by demanding for time limits on fractured wells B.H.P. Results show that the efficiency of an injection-production pressure system is direct proportion to reservoir thickness, permeability, producing pressure drop, is inverse proportion to oil viscosity, and is also related to injectionproduction rate, length of fracture, well spacing, well draining; the smaller the permeability, the quicker the B.H.P drop rate of fractured well, the smaller the terminal well draining;the higher the production rate, the quicker the B.H.P drop rate of fractured well, the smaller the terminal well draining;suitable relationship between permeability, production rate, well spacing, well draining and so on makes effective driving pressure system be established between injection and production wells.
Low permeability production decline effective driving pressure system mirror image theory rectangular nine-spot pattern terminal well draining
LIU Hualin XIONG Wei
Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Science, China, 065007
国际会议
成都
英文
190-196
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）