Selective water blocking agent made from oil residue or oily sludge and preparation method thereof

Abstract

The invention provides a selective water blocking agent prepared from oil residues or sludge containing oil and a preparation method thereof. The selective water blocking agent is prepared from, by weight, 20-40% of the oil residues or the sludge containing oil, 5-20% of asphalt, 0.2-1% of an amphoteric surfactant, 0.5-2% of a super dispersing agent, 1-10% of solid-phase particles and the balance water. The selective water blocking agent prepared from the oil residues or the sludge containing oil has the advantages that the preparation technology is simple, raw material sources are wide, price is low, the selective water blocking agent is environmentally friendly, and the compatibility between the selective water blocking agent and a stratum is good. The selective water blocking agent is large in blocking strength, high in selective water blocking capacity, free of damage to an oil reservoir and a stratum and wide in application range of oil reservoir types.

Description

technical field [0001] The invention belongs to the field of oil-water well profile control and water shutoff, and in particular relates to a selective water shutoff agent made from oil residue or oily sludge and a preparation method thereof. Background technique [0002] Oil residue is the product of advanced treatment of oily sludge. Oily sludge refers to oil tanks, settling tanks, sewage tanks, bottom sludge of grease traps, oily water treatment facilities in refineries, light hydrocarbon processing plants, The oil sand and oil sludge removed by the natural gas purification device, the ground crude oil and oily sludge produced by drilling, operation, and pipeline perforation. When the oil storage tank is storing oil, a small amount of mechanical impurities, sand, soil, heavy metal salts, and heavy oily components such as paraffin and asphaltene in the oil deposit on the bottom of the oil tank to form sludge at the bottom of the tank. [0003] The oily sludge is huge, if ...

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Problems solved by technology

The hot water washing process is easy to implement, low in investment costs, and can recover most of the oil products. It is difficult to deal with heavily emulsified oily sludge, which may cause secondary pollution. It is mainly suitable for landing oil sludge; the incineration method can reduce the amount to the greatest extent. Strong adaptability to raw materials, but high energy consumption, large equipment investment, high process technology requirements, generally low heat utilization rate, and there may be dust, SO 2 It is suitable for oily sludge with low water content and high oil content; the medium of thermal desorption method is completely inorganic, and hydrocarbons can be recycled, but the reaction conditions are relatively high and the operation is relatively complicated. Sludge with low water volume and high hydrocarbon content; solvent extraction method has high efficiency and thorough treatment, and most of the petroleum substances are extracted and recovered, but the extraction agent is expensive, there is some loss in the process, and the treatment cost is high. It is suitable for tank bottom sludge; The microbial treatment method has low energy consumption and low treatment cost, but the treatment cycle is long, the treatment effect on cycloalkanes, aromatics and heterocyclics is poor, it is difficult to adapt to high oily sludge, and resources cannot be reused. It is suitable for oil content less than 5% oily sludge

Due to the complex composition of oily sludge, no single treatment method can deal with all types of oily sludge

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