Wireline Dump Bailer With Outlet Pump for Deviated Well Unloading
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Solution Overview
Problem
Existing dump bailers face challenges in accurately unloading materials in deviated wells due to uncertain valve function and pressure issues, and they often require multiple trips to deliver sufficient chemicals for cleaning and lubrication, especially in wells with deposits that hinder equipment functionality.
Innovation Solution
A dump bailer equipped with a pump positioned at the outlet, which can be directly or indirectly coupled to a cable, and features a rotary motor-driven mono pump or PCP pump, along with releasable barriers to prevent fluid mixing and backflow, allowing for precise material delivery in both vertical and deviated wells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a valve-controlled dump bailer is used to unload material, then material can be delivered, but the valve function becomes uncertain and unloading accuracy deteriorates in deviated wells
Solution Approach 1:
The patent replaces the mechanical valve-controlled unloading system with a pump-based system. The pump is positioned at the outlet and can actively push material out through the outlet opening, eliminating the uncertainty of valve function and providing reliable material delivery in both vertical and deviated wells.
Solution Approach 2:
The pump is pre-positioned at the outlet during assembly, ready to immediately push material out when activated. This preliminary positioning ensures that unloading can begin instantly without relying on uncertain valve mechanisms, improving both operational ease and location accuracy.
2Quantity of substance
If multiple trips are made to deliver sufficient chemicals, then adequate material quantity is delivered, but operational time and productivity are reduced
Solution Approach 1:
The pump provides dynamic control over material delivery, allowing the system to deliver the required quantity of chemicals in a single trip by actively pumping the material out at the desired location. This eliminates the need for multiple trips, thereby improving productivity while ensuring adequate chemical delivery quantity.
3Reliability
If a pump is positioned at the outlet, then material can be reliably delivered in deviated wells, but device complexity increases
Solution Approach 1:
The patent extracts the unloading function from the complex valve mechanism and concentrates it in a simple pump positioned at the outlet. This simplifies the overall device structure while improving reliability, as the pump provides a single, reliable point of material ejection without the complexity of multiple valves and control mechanisms.
4Quantity of substance
If releasable barriers are added to prevent fluid mixing, then material purity is maintained, but device complexity increases
Solution Approach 1:
The releasable barriers act as intermediaries between the material inside the dump bailer and the surrounding well environment. These barriers prevent unwanted fluid mixing and maintain material purity during delivery and unloading operations. The barriers are simple in concept - essentially seal elements that can be released when needed - and do not significantly increase device complexity while effectively protecting material purity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reliable and efficient method for unloading materials, such as chemicals or curable cement, in both vertical and deviated wells, minimizing mixing with surrounding liquids and reducing the need for multiple trips, thus improving operational accuracy and effectiveness.
Implementation Method 1
a pump positioned in a flow path between the inlet and the outlet
Implementation Method 2
the pump during transport of the dump bailer in the well constitutes a tight barrier for a material carried in the receptacle
Data Source
AI summary
This invention relates to a dump bailer (1) for insertion into a well (20) in the ground. The dump bailer (1) includes a receptacle (2) which communicates with surroundings through an inlet (4) and an outlet (6), and a pump (10) positioned in a flow path (7) between the inlet (4) and the outlet (6). The pump (10) is positioned at the outlet (6), and the pump (10) during transport of the dump bailer (1) in the well (20) constitutes a sealed barrier for the carried material (18) in the receptacle (2). A method for use of the dump bailer (1) is also described.