Flexible Barrel Dump Bailer With Electric Pump
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Solution Overview
Problem
Current dump bailers face limitations in maximum practical length, volume of content released in one run, and control over drain rate, leading to incomplete cement deposition and heterogeneity in cement plugs due to sensitivity to gel strength and viscosity, especially in high inclination wells.
Innovation Solution
A dump bailer system with a tool body, elongated bendable receptacle, and integrated electric pump that pressurizes wellbore fluid to drive bailer content out, featuring piston assemblies with rupture disks and a vibrator for improved placement and release, allowing controlled flow rate and extended length without length limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gravity is used to dispense cement slurry from the dump bailer, then the device structure is simple, but the maximum practical length is limited and the drain rate cannot be controlled
Solution Approach 1:
The patent replaces the gravity-based mechanical dispensing system with an electric motor-driven screw mechanism. This substitution enables controlled rotation of the screw to dispense cement slurry at a regulated rate, eliminating the length limitations of gravity-based systems while providing precise flow control through motor speed regulation.
2Quantity of substance
If a long bailer is used to increase cement plug volume, then the volume of content released in one run increases, but the drain rate becomes uncontrolled causing turbulence and dilution
Solution Approach 1:
The patent replaces uncontrolled gravitational draining with a motor-driven screw dispensing system. The electric motor allows precise control of the screw rotation speed, which directly controls the drain rate of cement slurry. This enables long bailers to be used effectively while maintaining controlled, turbulence-free discharge through regulated flow rates.
3Quantity of substance
If multiple dumps are used for long cement plugs, then the total volume requirement is met, but the operation time increases and homogeneity is compromised due to repeated dilution
Solution Approach 1:
The patent enables continuous, controlled dispensing of cement slurry through the motor-driven screw mechanism. This continuous action allows the entire required cement volume to be deposited in a single controlled operation, eliminating the interruptions and repeated dilution events associated with multiple dumps, thereby reducing total operation time and ensuring plug homogeneity.
4Productivity
If the drain rate is rapid to reduce operation time, then the dispensing speed increases, but turbulence and intermixing with brine or water occurs causing dilution and viscosity loss
Solution Approach 1:
The patent replaces rapid, uncontrolled gravitational discharge with a motor-driven screw dispensing system. This mechanical system provides precise control over dispensing speed, allowing the cement slurry to be discharged at an optimized rate that maintains productivity while preventing turbulence and intermixing with wellbore fluids, thus avoiding dilution and viscosity loss.
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
Enables efficient and homogeneous cement deposition with controlled flow rate, reducing turbulence and dilution, and allowing longer, high-capacity cement plugs without the need for multiple dumps, improving the overall cementing operation.
Implementation Method 1
an electric pump carried by the tool body and disposed along a fluid passage extending from the exterior surface of the tool body to the first cavity end so that wellbore fluid can be pumped to into the cavity to pressurize the first side of the piston and drive the piston from the first cavity end to the second cavity end so as to release the bailer content from the cavity
Implementation Method 2
a vibrator carried by the tool body wherein the vibrator is positioned adjacent the first end or the second end of the cavity to improve release of the bailer content, and improve placement of the bailer content into the potentially complex geometry of the wellbore
Data Source
AI summary
A system and method for injecting bailer content utilizing a dump bailer having an elongated, flexible bailer receptacle secured between a head assembly and an injection assembly. Disposed within the dump bailer are first and second piston assemblies, each of which includes a piston having a central fluid passage with a pressure actuated flow control mechanism in the form of a rupture disk disposed along the fluid passage of the piston. An electric, positive displacement pump within the head assembly draws wellbore fluid into the dump bailer assembly to drive the first piston assembly towards the second piston assembly so as to release bailer content into a wellbore. The elongated flexible bailer receptacle may be a hose stored on a bailer receptacle reel, which hose may be paid out by the reel to a length that corresponds with a volume of bailer content to be released into the wellbore.