Frac Diverting Agent (WESTFLOW TB)
Hydraulic fracturing is technique for the development of shale oil and gas resources. However, production rates from these keeps declining after a year or so. A well may be re-fracked every one to two years of operation to stimulate production. Refracturing is a technique to offset declining production rates and provide a sustainable increase in production. Fractures are opened by acid treatment. Once an area of fracture is open, acid or water keeps flowing in the same path. Due to these opened acid/water channels, frac pressure declines rapidly and cause the failure of frac fluid reaching broader and deeper formation.
WESTFLOW TB agent is a polymer which is able to be blended into frac fluid during frac process to form the thick gel cake, temporarily block off the most permeable sections and to force the acid into less permeable sections. WESTFLOW TB agent distributes flow more evenly along the well-bore. When diverting agent is deposited, a cake forms with an associated permeability. Flow is diverted from the fractures where diverting agent gets deposited because of greater resistance to flow. The diverting agent downgrades with time at reservoir temperature so that the gas keeps flowing. For good performance, the diverting agent must be practically insoluble in water at room temperature and must downgrade with time at bottom hole temperature.