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低渗透油藏具有油层启动压力高、吸水能力差、油井受效慢、产油幅度较小等缺点,因而,低渗透油田无法依靠天然能量保证开发。人们通过研究,进一步认识了非达西渗流特征,并初步建立了非达西渗流方程以及结合生产实践中观察看出,超前注水方式是一种有效的低渗透油藏开发方式。实验过程中注采平衡,注采比为1:1,应按照现场注采比进行折算,确定现场注入水量与同步注水相比,在合理压力保持水平下,超前注水中前期见水较早、产液量高,对含水上升速度有一定抑制作用;生产初期,注入井近井地带压力呈上升趋势,上升速度逐渐变缓,中后期压力呈下降趋势,且下降速度逐渐增加,采出井近井地带压力初期下降幅度大,随着开采时间的增加,压力趋于恒定。本文通过超前注水室内物理模拟的研究,采用平板岩心模拟了超前注水过程,从理论论证了超前注水能够提高单井产能。
Low-permeability reservoirs have the disadvantages of high start-up pressure of oil layer, poor water absorption capacity, slow oil well acceptance and small oil production rate. Therefore, low-permeability oil fields can not rely on natural energy to ensure development. Through the study, people further understand the characteristics of non-Darcy seepage, and initially established the non-Darcy seepage equation combined with the observation of production practice shows that the advanced water injection method is an effective low permeability reservoir development. In the process of experiment, the injection and production should be balanced, the injection-production ratio should be 1: 1, and the injection-to-production ratio should be converted according to the on-site injection rate. Compared with synchronous injection, In the early stage of production, the pressure in the injection well near the wellbore is on the rise, the rate of ascent slows down gradually and the pressure in the middle and late stages shows a downward trend, and the descending speed increases gradually. In the early stage of production, In the early period, the pressure of the belt decreased greatly, and the pressure tended to be constant as the mining time increased. In this paper, through the research on the physical simulation of advanced injection water, the advanced core injection process is used to simulate the advanced injection process. It proves that advanced injection can improve single-well productivity.