Paraffin removal technological method by washing oil wells with hot steam

Abstract

The invention provides a paraffin removal technological method by washing oil wells with hot steam, which relates to an oil wells operation technological method. The method is mainly characterized in that softened water is heated to steam by using a hot pipe heating furnace, the steam temperature is kept to 120 DEG C-160 DEG C, the steam pressure is larger than the pressure of an oil well casing, the steam is introduced into an oil well from the oil well casing and is discharged from an oil pipe, and after 8-12 hours, the paraffin removal of the oil pipe can be finished. The method has the advantages that the problem of paraffin removal of oil wells with low yield or thick oil wells can be solved, oil wells with serious paraffin deposition and oil wells with severse oil pipe plugging of more than 60% can be washed, the method has no influence on crude oil production of the oil wells and no pollution to the oil reservoir, the safe production can be performed, and the method has high thermal efficiency, saves fuel oil and reduces the pollution. The method is suitable for oil wells with the daily yield of less than 8 cubic meters or oil wells with the crude oil viscosity of more than 10000 centipoises.

Description

technical field [0001] The invention relates to a process method for oil well operation. Background technique [0002] During the crude oil production process, the wax contained in the crude oil will continue to precipitate and condense on the oil pipe wall. After a long time, the oil pipe will be blocked. Therefore, after a period of time, the wax removal work should be carried out. At present, there are many wax removal methods in the oil production site, such as the wax removal method of installing a wax scraper on the sucker rod. This method is a mechanical wax removal method. The wax removal is not complete, and the removed wax is still in the crude oil. , it is still possible to clog the pipeline. There is also a method of chemical wax removal, that is, adding a wax remover to the oil well. After practical application, the wax removal effect of this method is not very good. If the method of gradually adding chemicals to the well at the wellhead, it will flow out with ...

AI Technical Summary

Problems solved by technology

This method requires 20-30 cubic meters of water, which consumes a lot of water. After heating the water and injecting it into the oil well, it will not only pollute the oil layer, but also cause the well to be killed. When the oil well is in production, it will take several days to discharge it, affecting yield, waste

This kind of heating furnace uses the flame to directly heat the furnace tube, the thermal efficiency is low, and the fuel it uses is diesel oil, so the consumption of diesel oil is relatively large, which not only wastes energy, but also pollutes the air

In addition, if the method of heating the output fluid of the oil well to re-inject the ring sleeve is used to remove wax, because the oil well sometimes produces oil intermittently, at this time the heating furnace is likely to burn the coil in the furnace red and cause an explosion, so there is also a large Security risks

Although a heating furnace that can output steam and a relatively safe heating furnace for heating oil well output fluid have been designed, if the conditions and methods of use are not used properly, the expected purpose will not be achieved, and even safety problems will occur, especially For oil wells with low fluid production or high crude oil viscosity, there is no better way to solve the problem of wax deposition in the tubing