FLOW DIVERTING AGENTS FOR WELL TREATMENT IN THE OIL AND GAS INDUSTRY

Within well life, well treatments are carried out to increase productivity by stimulating initially unproductive zones. These measures include hydraulic fracturing, multi-stage hydraulic fracturing, matrix acid treatment, acid fracturing, etc. These processing methods allow existing wells to support hydrocarbon production without drilling new wells. During these treatments, certain specialized particles or technical devices are used for isolating an already existing perforation or for liquid flow diverting. These particles or devices are usually called flow diverters, which can prevent the use of a drilling rig to create temporary physical barriers, reducing the overhaul cost. Recent improvements in flow deflection technology allow the use of various decomposable particles that act as a temporary bridge either at the perforation entrance or inside an existing crack. The basic principles of the injected compounds flow deflection are to create filtration resistance to the advance of the acid composition in the highly permeable part of the collector and the coating of untreated cracks. This article discusses rejecting agents, their origin, types, applications, and some case studies in which the use of rejecting agents has proven to be the most effective.