Hydromechanical Slot Perforator Cutting Unit With Independent Pistons
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Solution Overview
Problem
Existing well perforation devices suffer from uneven force application on cutting discs, leading to non-uniform slot formation, increased wear, and the need for additional operations to replace worn discs, resulting in reduced efficiency and reliability.
Innovation Solution
The introduction of an additional piston below the cutting unit to apply opposing force to the lower cutting tool, ensuring equal force distribution and uniform wear, along with a mechanism for independent extension of cutting tools to reduce jamming and enhance slot formation quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single piston-pusher is used to drive both upper and lower cutting discs, then the device structure is simple, but the force application on cutting discs becomes non-uniform leading to uneven slot formation
Solution Approach 1:
The single piston-pusher is divided into two independent pistons (upper piston and lower piston), each independently driving one cutting disc. This segmentation allows each piston to apply force uniformly to its respective cutting disc, resolving the non-uniform force application problem while maintaining reasonable structural complexity.
Solution Approach 2:
The upper and lower pistons are positioned asymmetrically relative to the central axis, with the lower piston located below the cutting unit and the upper piston above it. This asymmetric arrangement enables independent force application to each cutting disc, ensuring uniform slot formation in both upper and lower projections.
2Reliability
If the axial distance from lower cutting disc to central axis is increased to ensure exit yield, then the lower slot formation improves, but force application becomes more uneven and upper disc goes beyond dimensions
Solution Approach 1:
By segmenting the driving mechanism into independent upper and lower pistons, each piston can be optimized for its specific position and function. The lower piston can be positioned to ensure reliable exit yield while the upper piston maintains proper dimensional control, eliminating the compromise required by a single piston system.
3Productivity
If cutting tools are extended simultaneously in two projections, then productivity increases, but force distribution becomes uneven causing non-uniform wear
Solution Approach 1:
The simultaneous extension of cutting tools in two projections is achieved through independent upper and lower pistons, each controlling one cutting disc. This segmentation allows each cutting tool to receive uniform force application, ensuring uniform wear while maintaining high productivity through simultaneous operation.
Solution Approach 2:
The independent piston arrangement allows for optimization of force application parameters (pressure, stroke length, timing) for each cutting disc separately. This parameter control ensures uniform force distribution to both cutting tools, preventing non-uniform wear while maintaining high productivity.
4Duration of action of stationary object
If additional round-trip operations are performed to replace worn discs, then cutting tool life is extended, but time loss increases and efficiency decreases
Solution Approach 1:
By optimizing the force application parameters through independent pistons, the cutting discs experience uniform wear distribution, which extends their service life and reduces the frequency of replacement operations, thereby minimizing time 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
This design achieves uniform and efficient slot formation, reduces wear, and increases the reliability and performance of the perforator by ensuring equal force application and minimizing jamming, allowing for consistent high-quality slot creation in two projections.
Implementation Method 1
the upward stroke of the lower piston is provided by an action of fluid coming under pressure
Implementation Method 2
the balance beam is mounted in the casing with the possibility of rotation around an axle during the moving down of the upper piston
Implementation Method 3
both cutting tools are simultaneously performing at least two slots in the production column
Data Source
AI summary
The proposed hydro-mechanical slot-type perforator enables simultaneously performing at least two slots in a production column. The perforator includes a casing, upper and lower pistons movable within the casing, a cutting unit driven by the pistons and carrying extendable cutting tools, and, optionally, a retractable mechanism fixing the perforator for transportation. The extension is provided by rotatable shackles, or balance beams, or a combination thereof. The lower piston is moved by pressurized fluid supplied through hydraulic channels or a hydraulic system, made in the casing. The shackles rotate around axles being spaced apart, or coincided. The cutting tools can be mounted on the shackles' movable parts, and, when mutually interacted, oppositely extend the cutting tools during countermovement of the pistons. The cutting tools can be mounted in the balance beam's shoulders, or can represent sharp edges thereof. The shackles and balance beams can have wedge-shaped portions, grooves, and connecting rods.