Methodology for determining the critical rate and pressure depression of the water shut-off composition

Against the backdrop of increasing water content in wells, the development of more effective methods and technologies for water shutoff is becoming increasingly important. Despite the many methods to combat formation water isolation, this problem is one of the main ones in the exploitation of oil and gas fields. One way to solve the problem is to treat the bottomhole zone with various reagents and create a waterproofing screen in it. An indicator of the effectiveness of a water-insulating screen is the stability time of the screen. The stability time of the water-insulating screen, in addition to other factors associated with the physical characteristics of the insulating composition and the porous medium, depends on its location in the near-well space. Placing the sealant away from the well, where flow rates are lower, is expensive. At the same time, close placement of the insulating composition to the well due to high flow rates increases the likelihood of destruction of the insulating screen. Therefore, to increase the efficiency of insulation work in wells with high water content, the issue of determining the critical flow velocity that destroys the water insulation is of great practical interest. The article demonstrates a methodology for conducting experiments to determine the critical velocity and depression for a specific formation and a water-insulating gel-forming composition. The idea of the presented methodology is to conduct experimental studies on a linear model of a reservoir with different reservoir properties. Keywords: water shut-off; well stimulation; gel; production; water control; porous media; permeability.