摘要
黄河南地区油田属复杂小断块油藏,由于在开发中得不到有效的能量补给,致使开发效果极差.而单井注水吞吐开发方法利用油层的亲水性,发挥毛管力吸水排油的作用实现水驱,能有效地补充地层能量,恢复地层压力,提高采收率.单井注水吞吐要分多期进行,每个周期又分注水、闷井和采油3个阶段.注水量与注水速度与地层压力的恢复关系密切;闷井的目的是使注入水与原油进行充分交换,有利于原油采出;采油阶段为初期含水高,随采油时间的增加逐渐下降,然后再慢慢上升.油层润湿性和渗透率是影响单井注水吞吐开发的主要因素,油层水的润湿指数越大,油层的润湿性越强,自吸排油性就越强,采收率也就越高.渗透率越高,油水渗流能力就越强,注水平衡时间就越短,因而就会获得较高的采油速度.该方法在马11-108井实施后,效果十分显著.
Abstract
The oilfield in South Yellow River Region is composed of complicated small fault block reservoirs.There is no energy complement during oil field exploration,oil recovery result is very poor.Single well waterflood swallowing spitting method could complement the formation energy,restore formation pressure and improve recovery efficiency.The single well waterflood swallowing spilling should be carried out by stages,each stage could be divided into waterflooding,closing in and oil recovery substages.The restoration of formation pressure is closely related to the amount and rate of water injection.The closing in of wells is to make the water injected replacing oil.The wettability and permeability of the reservoir are the main factors effecting the waterflood swallowing spitting.The high wettability index of the reservoir determines it strong wettability,strong oil expulsion and high recovery rate;its high permeability means shorter water injection time and higher oil recovery velocity.This method is now used in Ma Ⅱ-108 Well,the result is evidence.
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