New Completion Technique of " White Oil Fracturing + Deep Acidizing" in Offshore Low-Permeability Oilfield

Abstract Aiming at the problems of easy collapse in the Beibuwan Basin and prone to water-lock and water sensitivity in low-pore and low-permeability reservoirs, oil-based drilling fluid is considered to be used for drilling of the target formation and acidizing and stimulating measures to ensure normal production of low-permeability oil fields; however, mud cake generated by the filtration loss of the oil-based drilling fluid, compatibility of the acid with the oil-based drilling fluid and the formation water, and the selection of the acidizing radius will influence the effect of the acidizing. Therefore, this paper takes a low-permeability oil well in Weizhou as an example, and through experimental simulation and mechanism analysis, solves the problem of mud cake breaking after completion drilling of oil-based drilling fluid, and proposes an acid system that reduces reservoir water-lock damage, keeps formation skeleton stable and realizes deep stimulating, and innovatively puts forward the new completion process of "white oil fracturing + deep acidizing" for offshore low- permeability oil fields. This new process was successfully applied in W6 well. This process has been successfully applied in W6 well, and the actual production rate is 223%, and the production has increased 1.4 times. The new completion process of "white oil fracturing + deep acidizing" in offshore low permeability oilfield proposed in this paper has a strong guiding significance for the development of offshore low permeability oilfield.