Wellhead drip medicament charging method by using water pressure to retain constant medicament charging differential pressure

Abstract

The well head chemical dropping method of utilizing water pressure to maintain constant chemical adding pressure aims at providing sufficient chemical adding amount to maintain constant chemical concentration and features that water is shunt with controlling tap from the water adding pipeline to the chemical adding tank to form constant pressure difference on the chemical storing capsule so as to control the chemical adding amount accurately, and the capsule is provided with filter and capillary for chemical to be dropped into water adding mixing pipe and added to oil jacket annular space connecting valve continuously and stably under relatively small pressure difference. The chemical adding tank has temperature maintained with water adding temperature maintaining pipe and water flows out through capillary in temperature maintaining water bath. The method has stable chemical concentration within the effective wax-preventing and antifreezing range.

Description

Technical field: [0001] The invention relates to the oil well dosing technology in the petroleum industry, in particular to a method for dripping medicine at the wellhead by using the mixed water pressure to maintain a constant medicine adding pressure difference. Background technique: [0002] In the process of oil production in the oil field, in order to realize the wax removal and anti-scaling of the downhole tubing and the downhole pump, it is necessary to add chemical agents to the downhole from the oil casing annular space of the oil well. At present, the conventional wellhead dosing is done by using water nozzles or valves. To control the amount of dosing in the well, the average daily dosing amount is designed to be 1-3Kg. However, due to the inaccurate control of the dosing amount and the small amount of dosing, the concentration of the dosing agent in the produced fluid fluctuates after the dosing agent passes through the liquid in the casing. , cannot be stabilize...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of the existing wellhead dosing method that the concentration of the medicine fluctuates greatly due to the small dosing amount and cannot be stabilized above the minimum effective concentration, the present invention provides a wellhead point drop method that uses water mixing pressure to maintain a constant dosing pressure difference. The drip method not only accurately controls the drug concentration in the downhole due to the small amount of drug added, but also makes the concentration of the chemical agent reach the inlet of the downhole oil well pump and the oil pipe to be continuously and stable within the range of effective wax control concentration , at the same time has the advantages of antifreeze in winter

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