METHOD OF OILFIELD DEVELOPMENT

摘要

The invention is referred to the oil industry and namely to methods of oilfield development through waterflood and aims at lowering the costs and raising ecological benefits of methods of near well bore area cleanup from plugging particles through their dispersion and dissolving by the impact of ultrasound in the active liquid media until the deposits turn into a thinly dispersed hydrophobic suspension with the dimensions of solid particles within 0.5-20 .mu.m with further injection of formed suspension into the reservoir to level out injectivity profile and decrease water inflow in producing wells. Active liquid with surface tension on the vapor contact within 20-35 mPa-sec-1 (erg/cm2), density exceeding flood water density by no less that 100 kg/m3 and viscosity equal to water phase viscosity or exceeding it by no more than 20 times is use. The optimum parameters of ultrasound impact are selected based on the results of prior laboratory testing of ultrasound dispersed sediment that was collected form the near well bore area. The testing is performed in various active liquids that provides a thinly dispersed hydrophobic suspension with the dimensions of particles within 0.520 .mu.m. Treating the near well bore area of wells with little sediment or wells that were previously cleaned from sediment through other methods to form thinly dispersed hydrophobic suspension in the near well bore area for its later use to block highly permeable reservoir intervals in place of active liquid media a dispersion of petroleum sludge-waste is injected into the well. The sludge is previously blended with the active liquid media, volume ratio being between 1:10 and 1:5 depending on the content of solid phase in the sludge.