Petroleum casing dosing device

Abstract

The invention discloses a petroleum casing dosing device which comprises a casing, an oil pressing tank, a chemical box, a pipeline assembly and a crude oil heater, and the chemical box is connected to the oil pressing tank; the oil pressing tank is used for pumping crude oil in the annular space of the sleeve into the tank; the side surface of the oil pressing tank is connected to an oil inlet of the crude oil heater through an oil outlet pipe; the pipeline assembly comprises a hot oil pipe, a mixing pipe and a control pipe, the hot oil pipe and the mixing pipe are connected into the sleeve, the other end of the hot oil pipe is connected with an oil outlet of the crude oil heater, and the other end of the mixing pipe is communicated with the hot oil pipe. According to the casing dosing device provided based on combination of petroleum casing dosing operation and hot oil well washing operation, hot oil circulation well washing can be conducted through the dosing device, the hot oil source is crude oil extracted from an annular space, an oil truck is not needed, a large amount of other hot oil or heat carriers do not need to be additionally consumed, meanwhile, oil well production stopping is not needed, and the pipe wall wax removal effect is achieved.

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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