A hydraulic system for automatic alarm and shutdown when encountering obstruction in a continuous tubing.

By integrating electromagnetic directional valves and weight sensors into the hydraulic system, automatic alarm and shutdown are achieved when the coiled tubing encounters obstruction, solving the problem of frequent obstruction accidents in coiled tubing operations and reducing operational risks and economic losses.

CN224283058UActive Publication Date: 2026-05-26HUAXIN TANGSHAN PETROLEUM EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HUAXIN TANGSHAN PETROLEUM EQUIP CO LTD
Filing Date
2025-08-14
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing technologies, obstruction accidents frequently occur during coiled tubing operations, leading to construction delays and significant economic losses. This is mainly due to the failure of construction personnel to detect abnormal downhole tubing loads in a timely manner, resulting in operational errors.

Method used

Design a hydraulic system that integrates an electromagnetic directional valve and a closed axial piston variable pump, uses a weight sensor to monitor load changes, automatically controls the injection head motor to stop, avoids human intervention, and achieves automatic alarm shutdown.

Benefits of technology

It effectively avoids operational errors caused by human negligence, reduces accidents of coiled tubing getting stuck, and lowers operational risks and economic losses.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224283058U_ABST
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Abstract

This utility model relates to a hydraulic system for automatic alarm and shutdown when encountering obstruction in coiled tubing, belonging to the field of coiled tubing operation technology. The technical solution is as follows: When the weight sensor on the injection head detects a sudden load change, and this load change reaches the initial set value, the weight sensor sends a pulse electrical signal to the solenoid directional valve. The main valve core of the solenoid directional valve reverses, and at this time, port 1 and port 2 of the solenoid directional valve are connected. Because port 2 of the solenoid directional valve is directly connected to the oil tank for unloading, the pressure difference acting on both sides of the three-position four-way servo valve is instantly relieved, and the three-position four-way servo valve returns to the neutral position. At this time, the output flow of the closed axial piston variable pump returns to 0, the speed of the injection head motor drops to 0, and the injection head motor automatically stops. This utility model does not require human intervention, avoiding operational losses caused by improper operation monitoring or failure to detect abnormal load fluctuations in a timely manner due to human negligence.
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