Wireline Bailer Tool for Precise Acid Placement
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Solution Overview
Problem
Current well stimulation methods, such as hydraulic fracturing and matrix treatments, face challenges in precise acid injection due to the stretching and buckling of coiled tubing or drill pipes, leading to depth discrepancies and potential failure of acid treatments when the acid is injected off-target.
Innovation Solution
A bailer tool assembly attached to a wireline or slickline, equipped with a piston, rotatable nozzles, and a depth indicator tool, allows for precise acid treatment by sliding the piston through a fluid reservoir to push acid through rotatable nozzles at a designated downhole location, using a gamma ray unit or casing collar locator for accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If coiled tubing or drill pipe is used to deliver acid downhole, then the acid can be delivered to deep target zones, but the tubing stretches and buckles during tripping, causing depth discrepancies that lead to off-target acid injection
Solution Approach 1:
The patent replaces the mechanical coiled tubing/drill pipe delivery system with a wireline-suspended bailer tool assembly. This substitution eliminates the stretching and buckling issues inherent in mechanical tubular systems while maintaining the ability to reach deep target zones. The wireline provides stable positional reference without the elastic deformation problems of coiled tubing.
Solution Approach 2:
The bailer tool assembly integrates multiple functions into a single device: it serves as both the acid containment vessel and the injection mechanism. The assembly combines the fluid reservoir, piston-driven injection system, and depth indication capabilities in one unified tool, eliminating the need for separate depth measurement equipment and reducing overall system complexity.
2Length of moving object
If coiled tubing or drill pipe is used for acid injection, then deep well treatment is enabled, but tripping time is increased due to rig up time and stretching/buckling issues
Solution Approach 1:
The patent replaces the mechanical coiled tubing/drill pipe delivery system with a wireline-suspended bailer tool assembly. This substitution eliminates the stretching and buckling issues inherent in mechanical tubular systems while maintaining the ability to reach deep target zones. The wireline provides stable positional reference without the elastic deformation problems of coiled tubing.
Solution Approach 2:
The bailer tool assembly is self-contained with an integrated fluid reservoir and piston system that operates autonomously downhole. The tool carries its own acid supply and injection mechanism, eliminating the need for continuous surface equipment rig up and teardown operations. This self-sufficient design significantly reduces tripping time and surface equipment requirements.
3Length of moving object
If acid is injected using coiled tubing or drill pipe, then the operation can be performed across deep target zones, but depth measurement becomes inaccurate due to stretching and buckling
Solution Approach 1:
The patent replaces the mechanical coiled tubing/drill pipe delivery system with a wireline-suspended bailer tool assembly. This substitution eliminates the stretching and buckling issues inherent in mechanical tubular systems while maintaining the ability to reach deep target zones. The wireline provides stable positional reference without the elastic deformation problems of coiled tubing.
Solution Approach 2:
The bailer tool assembly incorporates a depth indicator tool with gamma ray units or casing collar locators that provide real-time depth feedback. This feedback mechanism allows for continuous monitoring and verification of the tool's position, enabling precise depth control and confirmation of correct placement before acid injection occurs.
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 precise and effective acid treatment by ensuring accurate placement of the acid at the target location, preventing failures associated with off-depth injection and improving the efficiency of well stimulation operations.
Implementation Method 1
a depth indicator tool having at least one of a casing collar locator or a gamma ray unit attached to an upper end of the bailer tool assembly
Implementation Method 2
The first piston may then be activated to slide through the first fluid reservoir to push an acid out of the first fluid reservoir and through the plurality of rotatable nozzles
Data Source
AI summary
A system for acid treating a section of a well includes a wireline or slickline extending from a surface of the well into the well and a bailer tool assembly attached to an end of the wireline or slickline. The bailer tool assembly includes a first piston positioned in a first piston housing at an axial end of at least one bailer, the first piston being slidable through the at least one bailer, at least one rotatable nozzle positioned at a lower end of the bailer tool assembly and fluidly connected to a fluid reservoir in the at least one bailer, and a depth indicator tool attached to an upper end of the bailer tool assembly.