Passive type multifunctional well head backflow dredging compensating device

Abstract

The invention relates to a passive type multifunctional well head backflow dredging compensating device for petroleum industry, mainly comprising a separating backflow assembly and a medicament carrying unit, wherein the separating backflow assembly mainly comprises a well fluid separating unit, a filter, a sand and water storage chamber and a backflow flow rate control unit; the medicament carrying unit mainly comprises a medicament carrier, a medicament can and an air balancing connection pipe, wherein the medicament carrier is respectively communicated with a fluid returning pipe and the medicament can; and after well fluid is separated and filtered by the separating backflow assembly, a part of polluted water enters the medicament carrier through a well fluid backflow pipe column along the fluid returning pipe and is mixed with medicament inside the medicament can by a water power spray principle to flow back to a passage dredging submergence depth air in an oil sleeve ring in theair. The invention reduces the resisting force of the air which upwards flows from submergence depth, prevents the air reversely entering an electric pump, ensures the separating effect of an electric pump separator, prolongs the exemption period of an electric pump well and saves a great amount of operation expense and operation time.

Description

1. Technical field: [0001] The invention relates to a passive multifunctional wellhead backflow dredging compensation device used in the petroleum industry. 2. Background technology: [0002] During the production and operation of the electric pump well, the upward flow of gas through the submergence degree is affected by the temperature, pressure and the temperature difference between the tubing and casing walls, and the resistance it suffers is also constantly changing, resulting in the existence of gas in various forms. The crude oil is heated at high temperature for a long time, the viscosity of the crude oil gradually increases, hardens and dies, forming an oil cap, blocking the passage of gas, making it difficult for the gas to be discharged from the casing, and gathering in the upper part of the submergence to form foam sections of different lengths , and even form air pockets. Over a long period of time, the gas in the submerged gas will enter the electric pump in t...

AI Technical Summary

Problems solved by technology

Over a long period of time, the gas in the submersion will enter the electric pump in turn, seriously affecting the pump efficiency, and this phenomenon is more serious in oil wells with high wax content and high gas production.

This phenomenon will lead to: ①The separation effect of the electric pump separator becomes poor, the operating current of the electric pump is unstable, air lock occurs, and problems such as dry grinding of the electric pump impeller, cavitation, and pump jam occur, so that the displacement efficiency of the electric pump is in the range of The operation in the low-efficiency area leads to serious mechanical wear of the electric pump, shortens the maintenance-free period of the electric pump, and shortens the life of the electric pump; ②The measurement of the dynamic liquid level is inaccurate; ③It is difficult to calculate the supply pressure of the electric pump

In addition, the excessive difference between supply and demand of a single well caused by the adjustment of water injection in the oil field will also cause the displacement efficiency of the electric pump to operate in the low-efficiency area, causing serious mechanical wear of the electric pump, shortening the repair-free period of the electric pump, and shortening the life of the electric pump

The above problems not only greatly increase the operating cost, but also affect the production of crude oil

[0003] Currently, the dosing treatment adopts the method of pouring directly into the annulus of the oil sleeve, which will cause the chemical to stick to the oil, casing and cable, which not only loses the chemical, but also greatly reduces the use efficiency of the chemical due to the uneven mixing of the chemical

For the above problems, there is currently only the method of washing wells with cement trucks, but the instantaneous displacement of cement trucks is too large, and it is easy to have a negative difference with the bottom hole pressure, resulting in backflow, causing pollution to the formation, and the water content will increase after the well is opened for production. , the recovery period is also long, which affects crude oil production, and the well flushing is only a one-time treatment, which cannot fundamentally solve the problem

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