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基于系统、信息与控制的观点 ,认为对于水驱多层砂岩油田系统来说 ,注水是系统主要控制因素 ,并且具有不可间断的连续性 (周期注水是以注水量的平衡保证连续注入的效果 )。由于注水压力的高低、注水量的多少所引起地层中孔隙水压的大小与套管安危是密切相关的 ,于是人们注意并致力于合理注水压力的研究 ,寻求对油田系统的最佳控制。然而 ,由于人们对水驱多层砂岩油田合理注水压力概念的理解与定义上的差别 ,实践表明其控制效果差别也很大。重新定义了油田合理注水压力 ,强调保证油田生产设备 (套管 )的安全是确定合理注水压力的重要前提。同时根据对大庆油田水驱开发过程中注水压力、原始地层压力与套管损坏速度关系研究 ,认为油田合理注水压力应保持在原始地层压力水平 ,低于原始地层压力不利于获得最大产液量 ,高于原始地层压力容易导致套管损坏 ,从长远观点看更不利于系统获得最大产液量。
From the viewpoint of system, information and control, it is considered that water injection is the main control factor of the system in water-flooded multi-layer sandstone oilfields and has an unbroken continuity (periodic water injection ensures the continuous injection effect by the balance of water injection amount) . Due to the level of water injection pressure and the amount of water injected, the pore water pressure in formation is closely related to casing safety. People pay attention to and devote themselves to the research of reasonable water injection pressure and seek the best control of oilfield system. However, due to differences in the understanding and definition of the concept of reasonable water injection pressure in waterflooding multi-layer sandstone oilfields, practice shows that the control effects vary greatly. Redefinition of the reasonable injection pressure of the oilfield, stressing that ensuring the safety of oilfield production equipment (casing) is an important prerequisite for determining the reasonable injection pressure. At the same time, based on the research on the relationship between water injection pressure, initial formation pressure and casing damage velocity during the water flooding development in Daqing Oilfield, it is considered that reasonable injection pressure of oilfield should be maintained at the initial formation pressure level, lower than the original formation pressure is not conducive to obtaining the maximum fluid production, Higher than the original formation pressure easily lead to casing damage, in the long run more adverse to the system to obtain the maximum fluid production.