Wellhead controller with pressure change light rod

Abstract

The invention relates to the technical field of under-pressure operation equipment, and provides a well head controller for under-pressure polish rod replacing. The well head controller comprises an under-pressure control pipe, a pressure release valve and a packing seal box which can move a polish rod in a sealed mode; the lower portion of the packing seal box is fixedly provided with the under-pressure control pipe, the side wall of the under-pressure control pipe is provided with a side outlet pipe of which an inner hole is communicated with an inner cavity of the under-pressure control pipe, the side outlet pipe is fixedly provided with the pressure release valve, a limit part which can limit upward displacement of the polish rod through a limit coupling is arranged in the under-pressure control pipe, and the outer side of the lower end of the under-pressure control pipe is provided with an outer thread capable of being together connected with a well head. According to the well head controller, the structure is reasonable and compact, and under-pressure lifting of the polish rod can be achieved through the combination of the packing seal box which replaces an original packing box and the under-pressure control pipe; by adopting the well head controller to perform under-pressure polish rod replacing operation, operation is convenient, time and labor are saved, convenience and rapidness are achieved, the structure is simple, the production cost is low, the safety coefficient is high, the environment is not prone to be polluted, the stability is high, and invalidation is not prone to occur.

Description

technical field [0001] The invention relates to the technical field of hot-press operation equipment, and relates to a wellhead controller for a hot-drain polished rod. Background technique [0002] At present, when the polished rod is replaced in the downhole operation, it is first necessary to release and reduce the pressure. In the case that the pressure cannot be released, it is necessary to carry out the well flushing operation and use the well killing fluid to reduce the wellhead pressure and achieve the purpose of replacing the polished rod. When the pressure in the well is discharged, a large amount of crude oil is lost and there is a safety hazard, and it will also cause pollution to the environment. When the pressure in the well is released, the outlet control tank is used, and the well killing fluid is used when the pressure cannot be released all the time. In this case, the cost is always high. Contents of the invention [0003] The present invention provides...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a wellhead controller for the light changing rod with pressure, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the existing needs of the light changing rod in the downhole. It is time-consuming and labor-intensive to depressurize first, and there are potential safety hazards. It will also pollute the environment, and the conventional depressurization operation is prone to failure. It is often necessary to perform cleaning operations or use killing fluids, which will increase costs.

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