A water injection pipe for offshore water injection wells

Abstract

The invention discloses a water injection pipe for an offshore water injection well, which comprises a pipe body provided with external threads at both ends, the pipe bodies are connected by couplings provided with internal threads, and the ends of the external threads of the pipe are provided with The axially elongated nose of the body, the inner wall in the middle of the coupling is provided with a radial inner boss, the thickness of the nose is consistent with the height of the radial inner boss, so that the inner diameter of the water injection pipe is consistent; the radial inner boss of the collar is consistent with the height of the radial inner boss A polytetrafluoroethylene gasket is arranged between the nose ends of the pipe body; an epoxy resin protective layer is arranged on the inner wall of the pipe body and the radially inner boss surface of the collar. The present invention adopts a pipe body thread structure with a nose end and a coupling structure with a radially inner boss, so that the inner diameter of the water injection pipe is completely consistent, effectively eliminating the influence caused by the eddy current, and preventing severe erosion and large-scale scaling , Extend the continuous working life of the water injection pipe, improve the water injection efficiency, increase the water injection volume, increase the formation pressure, reduce the frequency of downtime and maintenance, and reduce the production cost.

Description

technical field [0001] The present invention relates to equipment components for extracting oil, gas, water, soluble or meltable substances or mineral mud from wells, in particular, to a water injection pipe for offshore water injection wells. Background technique [0002] In the development of oilfields, with the continuous development of oil reservoirs, it is inevitable that the production will decrease and the oil recovery rate will decrease. Therefore, it is necessary to inject water into the oil reservoirs through water injection wells to achieve the effect of oil displacement and realize the stable production of oil fields. , Resumption of production. The water injection pipe is the pipeline for injecting water into the oil reservoir, so its water injection efficiency will greatly affect the water injection volume, thereby affecting the production and work efficiency of the oil field. At present, the water injection pipes used in offshore water injection wells are all...

AI Technical Summary

Problems solved by technology

Erosion causes the water injection pipe to be unusable and needs to be replaced in time; large-area scaling causes the inner diameter of the water injection pipe to become smaller and the pressure in the pipe increases, which leads to the phenomenon of suffocation of the water injection pump, which needs to be shut down for maintenance

Therefore, at present, the continuous working life of ordinary water injection pipes is short, only about one year, and the shutdown and maintenance are more frequent, resulting in lower working efficiency and higher production costs of offshore water injection wells

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