An oil casing dosing device

Abstract

The invention discloses a petroleum casing dosing device, comprising: a casing, a pressure oil tank, a medicine box, a pipeline assembly and a crude oil heater, the medicine box is connected to the pressure oil tank; The crude oil in the annular space is pumped into the tank, and the side of the pressure oil tank is connected to the oil inlet of the crude oil heater through the oil outlet pipe; the pipeline assembly includes a hot oil pipe, a mixing pipe and a control pipe, and the hot oil pipe and the mixing pipe are connected The other end of the thermal oil pipe is connected to the oil outlet of the crude oil heater, and the other end of the mixing pipe is connected to the thermal oil pipe. The present invention is based on the casing dosing device proposed by combining the oil casing dosing operation and the hot oil well washing operation. The dosing device can be used to perform hot oil circulation and well washing. The source of the hot oil is crude oil extracted from the annular space. There is no need to rely on oil trucks, and there is no need to consume a large amount of other hot oil or heat carriers, and it is also not necessary to stop production of the oil well to achieve the effect of removing wax from the pipe wall.

Description

technical field [0001] The invention relates to the technical field related to oil production, in particular to an oil casing dosing device. Background technique [0002] In the process of crude oil extraction, due to changes in the physical properties and production parameters of crude oil, scaling and wax formation are easy to occur on the inner wall of the oil pipe, which will not only cause damage to the oil layer, reduce production capacity, but also increase the frequency of maintenance operations of oil wells. Therefore, it is very important in oil recovery operations to reduce viscosity and remove wax by physical and chemical methods such as pipe washing and dosing. [0003] Generally, the chemical dosing process is to inject wax removal and viscosity reducing agents into the annular space between the casing and the oil pipe, enter the oil pipe through the pumping power, and remove the wax after reacting with crude oil. Generally, dosing needs to manually open the f...

AI Technical Summary

Problems solved by technology

Generally, thermal wax removal requires the use of oil trucks to circulate the well with hot oil or other heat carriers to melt the wax and take it out of the well, which consumes a lot of hot oil. At the same time, the oil well needs to be shut down during this period, which affects the production.

[0005] To sum up, at present, there are problems such as low efficiency and large loss in the various methods of reducing viscosity, increasing production and removing wax of tubing in oil wells.

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