Efficient cleaning tool for offshore oilfield seawater pump wellbore

The high-efficiency cleaning tool for offshore oilfield seawater pump wellbore, which integrates mechanical scraping and high-pressure flushing, solves the problems of long time, high cost and high risk of traditional cleaning methods. It achieves efficient cleaning of sediments on the inner wall and bottom of the wellbore, and significantly improves the operational reliability and safety of the seawater pump system.

CN122328019APending Publication Date: 2026-07-03CNOOC TIANJIN BRANCH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CNOOC TIANJIN BRANCH
Filing Date
2026-06-02
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Traditional wellbore cleaning relies on high-risk diving operations, which are time-consuming and costly. Furthermore, simple water flushing or purely mechanical scraping is insufficient to effectively remove the mixture of marine organisms and mud and sand blockages inside the wellbore of offshore oilfield seawater pumps.

Method used

Design a high-efficiency cleaning tool for offshore oilfield seawater pump wellbore, integrating mechanical scraping and high-pressure flushing functions. Made of stainless steel, it achieves full-coverage cleaning of the wellbore's inner wall through the coordinated work of a circular wellbore scraper and a conical nozzle, and is operated using the platform's fire-fighting water system.

Benefits of technology

It has achieved efficient removal of sediment from the inner wall and bottom of the well, shortened the cleaning time, reduced operational risks and maintenance costs, and improved the operational reliability and maintenance efficiency of the seawater pump system.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a high-efficiency cleaning tool for offshore oilfield seawater pump wellbores, comprising a high-pressure water inlet pipe, the tail end of which is connected to an octagonal closed-loop high-pressure seawater ring pipe. The high-pressure seawater ring pipe is connected to a high-pressure drainage long pipe via eight high-pressure drainage short pipes, and the end of the high-pressure drainage long pipe is connected to a conical nozzle. A circular wellbore scraper is installed between the high-pressure drainage long pipe and the high-pressure drainage short pipes. This invention integrates the circular wellbore scraper with eight flushing branches consisting of high-pressure drainage short pipes, high-pressure drainage long pipes, and conical nozzles, and installs the entire assembly at the bottom of the riser pipe. This allows the cleaning tool to simultaneously achieve mechanical scraping of the wellbore inner wall and high-pressure flushing of bottom deposits during the lowering or raising of the riser pipe.
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