Improving the Technology of Complex Hydrogen Thermobarochemical Treatment CHTBCE for Effective Use in Oil Wells With Weakly Consolidated Sandy Reservoirs

Abstract

Today, it is common practice to produce oil from failure-prone, weakly cemented reservoirs. The operators’ desire to increase production requires operating wells at their maximum capacity, and therefore leads to more aggressive drainage of the reservoirs with high oil flow from the pay zone to the well bore. At the same time, the oil filtration rate increases significantly, especially in the near well bore zone. This promotes the active movement of rock particles together with the production from the bottomhole formation zone to the well bore. Sand movement to the well bore and removal into the well itself leads to many unfavourable consequences, such as reservoir disintegration, up to the collapse of the reservoir roof, blocking of filtration channels in the bottomhole formation zone (BFZ), accumulation in the well bore with an overlap of the productive interval. All this prevents the product from entering the well, leading to abrasive wear, pumping equipment failure, etc. These factors affect the quality of the filtration properties of the bottomhole formation zone, disrupt the hydrodynamic link between the productive formation and the well bore, resulting in its productivity drop. To date, there are several technologies aimed at consolidating the bottomhole formation zone and preventing sand removal. They are used depending on the design of the bottomhole, the time of operation, the geological and temperature parameters, the mechanical, and the chemical and combined methods of securing the formation rocks in the bottomhole zone of the wells. As a rule, the use of these technologies leads to a decrease in the filtration-capacitance properties (FCP) of the reservoir. These technologies fail to solve other common problems of well flow rate reduction, such as colmatization, asphalt-resin-paraffin deposition (ARPD), FCP reduction by oil-water emulsions, etc. At the same time, the methods of complex impact on the reservoir are now widespread to increase well productivity. Their application during one technological treatment exertsa multifactor physical and chemical effect on the rock and its saturating fluids, with several flow rate reduction factors being eliminated simultaneously. The controllability of the physicochemical processes employed in the oil production enhancement methods (OPEM) opens up prospects for their use to improve FCP with simultaneous reservoir consolidation.