Selective water plugging agent of thin oil well as well as preparation method and application of selective water plugging agent

Abstract

The invention provides a selective water plugging agent of thin oil well as well as a preparation method and application of the selective water plugging agent. By taking the total weight of the selective water plugging agent as 100 percent, the selective water plugging agent is prepared from the following raw materials through the following dosage: 3 percent to 6 percent of soft oil sludge, 2 percent to 4 percent of ageing oil, 0.5 percent 1 percent of an amide modified starch copolymer YX-I, 0.3 percent to 0.6 percent of sodium alpha-olefinsulfonate, 0.2 percent to 0.5 percent of sodium dodecyl sulfate, 0.2 percent to 0.4 percent of sodium stearate, 0.3 to 0.5 part of glyceryl stearate, 0.1 percent to 0.2 percent of sodium pyrophosphate, 0.08 percent to 0.15 percent of silicon dioxide, 0.15 percent to 0.25 percent of kaolin, 0.1 percent to 0.2 percent of mica powder and the balance of water. The selective water plugging agent has good compatibility with a stratum; the plugging strength is great and deep water plugging can be realized; the selective water plugging capability is high; the selective water plugging agent has no damages to an oil layer and does not pollute the stratum, so that the selective water plugging agent is completely suitable for an oil well plugging technology of a thin-oil oil reservoir.

Description

technical field [0001] The invention relates to a selective water shutoff agent for thin oil wells, a preparation method and application thereof, and belongs to the technical field of oil field chemistry. Background technique [0002] Soft sludge refers to the highly oily sludge produced by the oil tanks, settling tanks, and sewage tanks of the combined station of the oil production plant. The soft sludge has become one of the main pollutants produced in the oilfield development process. In recent years, due to the gradual improvement of my country's environmental protection regulations and the requirements of the group company to create green development, the issue of sludge treatment has increasingly attracted people's attention. Liaohe Oilfield produces a large amount of soft sludge every year. Due to its complex composition, it is difficult to separate the crude oil from the soft sludge. The existing technology has high processing costs and difficulty in harmless treatme...

AI Technical Summary

Problems solved by technology

Liaohe Oilfield produces a large amount of soft sludge every year. Due to its complex composition, it is difficult to separate the crude oil from the soft sludge. The existing technology has high processing costs and difficulty in harmless treatment, resulting in insufficient recovery of crude oil and failure of other components. Recycling

[0003] At the same time, the ground crude oil at the sewage station of the oil refinery, the floating oil on the upper part of the sewage settling tank, the sewage oil in the recovery pool of the sewage treatment station, and the intermediate transition layer of the oil-water interface of the dehydrator will produce a large amount of aged oil. The composition of the aged oil is complex, and its relative Density, viscosity, bituminous colloid content is high, and in addition to a large amount of colloidal asphaltenes in the aging oil, it also contains high calcium, sodium, magnesium and other metals, these components make the aging oil high in water content and difficult to dehydrate

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