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近年来,通过扎实开展以注够水、注好水、有效注水为核心的各项工作,水驱注水质量不断提高。尽管如此,由于受水质、洗井及层间干扰等问题的影响,目前水驱分层注水合格率仍然有待提高。特别是仍存在部分分层测试成果显示分层注水合格,但同位素吸水剖面显示有高强度注水层段和未动用层段,实际层段注水合格率低,如果这一问题得不到解决,层段性质和水量长期得不到调整,势必影响开发效果。为此,有必要开展周期注水的做法,力求通过注水井注水量的周期性变化,使油层压力场产生较大扰动,从而有效调整纵向和平面压力场,提高注水方案符合率,同时节约注水量,提高注入水的效率,最终达到控制含水上升率、自然递减率和低效无效注水量、产液量的目的。
In recent years, the quality of waterflooding water injection has been continuously improved through solidly carrying out various tasks with the core of injecting enough water, injecting good water and injecting water effectively. Nevertheless, due to water quality, well washing and inter-layer interference and other issues, the current water-driven stratified water injection qualification rate still needs to be improved. In particular, there are still some stratified test results show that stratified water injection pass, but the isotope water absorption profile shows high-intensity water injection interval and not used interval, the actual interval of water injection qualification rate is low, if this problem can not be solved, the layer Long-term lack of adjustment of the nature and amount of water is bound to affect the development results. For this reason, it is necessary to carry out the cycle water injection, and strive to make the pressure field of the reservoir produce great perturbation through the periodic change of injection water injection volume so as to effectively adjust the vertical and horizontal pressure fields, increase the coincidence rate of water injection scheme and save the water injection amount , Improve the efficiency of water injection, and ultimately achieve the purpose of controlling the rising rate of water, the natural rate of decline and inefficient water injection, the amount of liquid production.