A wax remover and anti-wax agent effective in the deep part of oil well wellbore and its preparation method

Abstract

A wax remover and anti-wax agent effective in the deep part of oil well shaft and its preparation method, by weight percentage, 20%-40% n-heptane, 40%-60% mixed aromatics, 2%-5% density modifier Mix evenly, then add 10%-20% mutual solvent, 0.1%-0.5% penetrant, mix evenly, then add 1%-5% surfactant, mix evenly, then add 0.1%-0.5% anti-wax component Can. The wax melting rate of the oil-soluble wax removing and preventing agent of the present invention reaches above 0.048g / min, and the wax preventing rate reaches above 40.4%, which can effectively prevent oil wells from waxing, thereby having dual effects of wax removing and wax preventing, and greatly improving oil solubility The wax removal efficiency of the wax removal agent. When in use, the high-density paraffin-removing agent can be put into the oil well collar space, which is convenient to use; and it is easy to sink into the bottom of the well, and can effectively act on the deep part of the wellbore for a long time to remove paraffin.

Description

technical field [0001] The invention relates to an anti-wax agent, in particular to an anti-wax agent effective in the deep part of an oil well shaft and a preparation method thereof. Background technique [0002] The wax content of most crude oil in my country is higher than 40%, which brings certain difficulties to the exploitation of crude oil and also increases the production cost. In the process of crude oil development, with the continuous decrease of pressure, the precipitation of dissolved gas and the decrease of temperature, when the temperature of crude oil drops to the wax precipitation point, wax crystals begin to precipitate and grow up, forming a three-dimensional network-like solid. The deposition of wax on various parts of the tubing reduces the area of ​​the oil flow channel and increases its flow resistance, resulting in a decrease in crude oil production. In severe cases, it will cause serious problems such as wax plugging, wax sticking, section rods, and ...

AI Technical Summary

Problems solved by technology

①The oil-soluble wax remover and anti-wax agent has high wax removal efficiency but is toxic, and the water-based wax remover has low toxicity but poor wax removal effect; Waxes combine the advantages of oil-based and water-based, but the preparation and storage conditions are harsh and the stability is poor. The solid type mainly plays the role of wax prevention

The main reason is that the use of wax remover vehicles is restricted by road conditions and weather factors, and chemical wax removers are not targeted and have a limited range of action

Especially in the deep part of the wellbore, the paraffin remover cannot reach the deep part of the wellbore, and its effect is not good, and the use effect of the chemical paraffin remover is also greatly reduced in the environment of high bottom temperature

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