Double-pipe cyclic heating wellhead four-way device

Abstract

The invention provides a double-pipe cyclic heating wellhead four-way device. The double-pipe cyclic heating wellhead four-way device comprises an outer pipe and an inner pipe, wherein the outer pipe sleeves the inner pipe in a fixed manner; an annular space is formed between the inner pipe and the outer pipe; a water inlet bypass and a water outlet bypass communicated with the annular space are arranged on the pipe wall of the outer pipe; the water inlet bypass is located above the water outlet bypass; a filtering assembly is arranged in the outer pipe and at the upper end of the inner pipe; the filtering assembly comprises a shell with a water filtering cavity and a filter element arranged in the water filtering cavity; a water inlet hole and a water outlet hole are formed in the shell; the water inlet hole is communicated with the water inlet bypass; the water outlet hole is communicated with the upper end opening of the inner pipe; and a liquid circulating channel is formed by sequentially making the water inlet bypass, the filtering assembly, an inner cavity of the inner pipe, the annular space and the water outlet bypass communicated. The double-pipe cyclic heating wellhead four-way device can be used for filtering water and the liquid circulating channel is prevented from being blocked.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a wellhead four-way device for circulation heating of double-pipe hollow rods. Background technique [0002] With the improvement of the processing technology level, the double hollow rod hot water circulation heating technology has gradually matured. This technology is obviously superior to the electric heating process in terms of energy consumption, and it is the development direction of the rod pump heat tracing lift. The core principle of this technology is to establish a thermal circulation channel through double hollow rods, and then heat the liquid in the oil pipe. The process has very high requirements on water quality. The oilfield injection water is generally pre-treated and can only be used if it meets the injection requirements, and the impurity content generally does not exceed 3%. In the double-pipe circulation heating process, due to the small diameter o...

AI Technical Summary

Problems solved by technology

In the double-pipe circulation heating process, due to the small pipe diameter and long injection period, there are more impurities deposited in the hot water during circulation, which has a greater impact

If the incoming water contains impurities, calcium, magnesium ions, etc., during the hot water circulation process, impurities will precipitate or scale, which will block the circulation channel, resulting in increased circulation pressure, reduced circulation volume, and even jamming of the inner pipe , which brings great inconvenience to construction, operation and production

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