Watering paraffin control method for prefabricated small oil pipe in rodless lifting oil well shaft

Abstract

The invention relates to the technical field of oil production well paraffin removal and control, and belongs to a watering paraffin control method for a prefabricated small oil pipe in a rodless lifting oil well shaft. The watering paraffin control method solves the problem of paraffin precipitation of medium and small displacement rodless lifting oil wells, water in an existing process watering pipeline is injected into a small-diameter oil pipe through a water injection pipeline and flows back from the oil pipe, a check valve is installed at the tail end of the lowermost oil pipe of the small-diameter oil pipe to reduce ground injection pressure, finally, the purpose of paraffin prevention is achieved by increasing the temperature and the flow velocity of produced liquid in the shaft, and in addition, when the pressure of the water injection pipeline is small, the injection pressure can be increased by starting a booster pump. The method has the advantages that the wellhead structure is slightly transformed and is easy to implement, one-time use is achieved, and the operation and maintenance cost is low.

Description

technical field [0001] The invention relates to the technical field of wax removal and prevention in oil production wells, and belongs to a wax-proof method for prefabricating small oil pipes mixed with water in the wellbore of an oil well without rods. Background technique [0002] With the development of oil extraction technology, the number of rodless oil extraction equipment is increasing year by year, which is the development trend of future oil extraction technology. However, because the rodless lifting equipment does not have the agitation of the sucker rod string, and at the same time, the displacement is small and the flow rate is slow, the wax deposition in the oil well is relatively serious. The existing wax removal methods mainly use hot well washing, artificial wax removal, and electric heating to prevent wax etc., the above-mentioned technologies have deficiencies in terms of operation and maintenance costs, operation intensity, and formation crude oil producti...

AI Technical Summary

Problems solved by technology

However, because the rodless lifting equipment does not have the agitation of the sucker rod string, and at the same time, the displacement is small and the flow rate is slow, the wax deposition in the oil well is relatively serious. The existing wax removal methods mainly use hot well washing, artificial wax removal, and electric heating to prevent wax etc., the above-mentioned technologies have deficiencies in operation and maintenance cost, operation intensity, and formation crude oil production.

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