Real-time evaluation of deep profile control and water shutoff for ultra-high water cut oilfields

It is an effective technology to start the remaining oil in ultra-high water cut reservoirs by deep plugging to force the fluid flow to turn. Howevr, there is no reliable real-time monitoring and evaluation method when deep plugging is implemented on site. Based on the action mechanism of plugging agents, taking Ng63+4 unit in Gudong 7th District as an example, combined with the underground oil and water distribution characteristics of ultra-high water-cut reservoirs, the seepage resistance equations of different levels of water flooding zones were derived. The results show that the degree of control of deep profile control and water shutoff on extreme waterflooding zone can be characterized by the change of total seepage resistance. Define the plugging control factor as a real-time evaluation index for deep profile control and water shutoff to reflect the deep plugging control effect in real time. There is an obvious correspondence between the plugging control factor curve and the corresponding oil well production curve, which can be used to determine the time of effectiveness and validity of the construction, guide the screening of the profile control and flooding system and determine the timing of injection. © 2024 University of Petroleum, China. All rights reserved.