Improving the Operation Efficiency of Deviated Wells with High Oil Viscosity Values and Abnormally Low Reservoir Pressures

Abstract

Hydraulic fracturing of a formation causes its partial destruction; the subsequent operation of wells is frequently complicated by the release of solid particles (mechanical impurities) from the bottomhole, as well as by the inflow of loose proppant particles into the pump. The authors show how the occurrence of mechanical impurities in the produced fluid affects the operation of downhole installations and the number of well maintenance operations. The paper provides information on the results of measures implemented to prevent mechanical impurities from getting into the pump, whereupon the situation with wells complicated by mechanical impurities has significantly improved. To improve the efficiency of operation of curved wells with high oil viscosity values and abnormally low reservoir pressures, various downhole sucker rod pumps and new solutions for sucker-rod screw pump (PCP) installations have been developed. The analysis of existing PCP designs was carried out. The today's key strategy of Sheshmaoil Management Company LLC (Republic of Tatarstan, Russia) is to maintain oil production by applying highly effective well interventions (WI), i.e. hydraulic fracturing (HF) [1, 2]. This method of reservoir stimulation has been massively implemented in all seven production companies of Sheshmaoil Management Company LLC since 2014. Mainly transition to such type of WI is connected with abandoning of ineffective methods of production stimulation with various options of acid treatment: – acid treatments of bottomhole zones; – large-volume selective acid treatments; – acid hydraulic fracturing; – foam-acid treatment.