Efficient and safe emulsion type paraffin removal agent for oil well and preparation method of paraffin removal agent.

Abstract

The invention discloses an efficient and safe emulsion type paraffin removal agent for an oil well and a preparation method of the paraffin removal agent. The paraffin removal agent consists of the following components: an organic solvent, light oil, a surfactant and a weighting agent. The preparation method of the paraffin removal agent comprises the following steps: preparing the surfactant; preparing a mixture, and preparing the paraffin removal agent. The paraffin removal agent prepared by the method has a high paraffin dissolving rate, and does not contain corrosive compounds of chlorine,sulfur and the like, so that the corrosion problem of crude oil processing equipment is eliminated. Meanwhile, the paraffin removal agent is cheap, is easy to obtain, has low cost, has a high paraffin dissolving speed, is safe and reliable, and is very convenient to use, store and transport. The paraffin removal agent can well solve the problem of paraffin deposit in oil wells, oil well production efficiency is greatly improved, oil well inspection cycle is improved, the paraffin removal agent has great significance on reducing production cost and keeping normal production of the oil well, and meanwhile, petroleum refining in a later period is not influenced.

Description

technical field [0001] The invention relates to the technical field of oil well wax removal, in particular to an efficient and safe emulsion type wax remover for oil wells and a preparation method thereof. Background technique [0002] At present, the wax content of crude oil in my country is generally high. For crude oil with a certain amount of paraffin dissolved in it, during the mining process, with the decrease of temperature and pressure and the precipitation of gas, the dissolved paraffin will precipitate in the form of crystals, grow up and accumulate and deposit on the On the solid surface such as the pipe wall, the so-called wax deposition phenomenon occurs. The wax deposition will block the oil-producing layer, reduce the production of the oil well, and also increase the load of the oil well, causing production accidents. Therefore, oil well cleaning and wax prevention are important technical measures to ensure the normal production of waxy crude oil wells. At pres...

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Problems solved by technology

The oil-soluble wax remover has fast wax melting speed, low freezing point, strong adaptability to crude oil, and good wax removal effect, but the solvent used in the oil-soluble wax remover is highly toxic, flammable, explosive, and easily destroyed. Crude oil is diluted, so its application is greatly limited, such as CS with good wax removal effect 2 Because of its high toxicity and easy poisoning of refining catalysts, it has been discontinued. At present, solvents containing sulfur and chlorine are used less and less because of their high toxicity to the human body; water-soluble wax removers have a relatively high density and are suitable for oil wells with high water content. It is not easy to catch fire, but the wax removal speed of water-soluble wax remover is slow, the fluidity at low temperature is poor, and the price of the main component surfactant is high, the use concentration is large, the wax removal efficiency is slow, the cost is high, and it is not easy to promote; the emulsion type wax remover is The oil-soluble wax remover with good wax removal effect and the water-soluble wax remover with low toxicity are emulsified with an appropriate emulsifier to form an emulsion. This wax remover will break the emulsion before entering the waxing section and separate the water Two kinds of wax removers and oil-based, work on the paraffin deposited on the pipe wall at the same time

Although there are many types of wax removers used in oilfields, there are few wax remover products that can simultaneously have good safety and high efficiency.