Downhole Cutting Tool Flow Restriction Assembly
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Solution Overview
Problem
Existing downhole tools require multiple trips to perform various tasks, making the process time-consuming and expensive, as they lack the capability to efficiently control fluid flow and actuate multiple tools on a single tool string.
Innovation Solution
A downhole cutting tool with a flow restriction assembly and hydraulic actuation system that allows controlled actuation of cutting and other tools on the same tool string, enabling multiple operations in a single trip by managing fluid flow paths and applying axial forces, such as weight or ball drops, to facilitate the use of different tools with specific hydraulic requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple downhole tools are used on the same tool string, then productivity and efficiency improve by performing multiple operations in a single trip, but control over fluid flow and actuation becomes complex and difficult to manage
Solution Approach 1:
The fluid flow system is segmented into multiple independent flow paths (first flow path and second flow path) that can be controlled separately. Each flow path has its own control mechanism, allowing independent actuation of different downhole tools without interfering with each other, thus managing complexity while enabling multiple operations
Solution Approach 2:
A flow restriction assembly acts as an intermediary component between the fluid source and the cutting mechanism. This intermediary controls fluid flow to the cutting mechanism by introducing a pressure difference, enabling precise control of the cutting tool's actuation while allowing other tools to be operated simultaneously through different flow paths
2Quantity of substance
If fluid flow is increased to actuate downstream tools like drills and mills, then those tools can operate effectively, but the cutting tool may activate unintentionally
Solution Approach 1:
The hydraulic system is divided into separate flow paths with independent control. The first flow path supplies fluid to downstream tools requiring high flow rates, while the second flow path controls the cutting mechanism. This segmentation ensures that increasing flow for downstream tools does not inadvertently activate the cutting tool
Solution Approach 2:
Different flow rates and pressure parameters are assigned to different flow paths. The system changes fluid parameters (flow rate, pressure) selectively for different tools based on their specific requirements, allowing high flow rates for drills/mills while maintaining controlled, lower flow rates for the cutting mechanism until intentionally activated
3Reliability
If multiple trips are made to perform different downhole tasks, then each task can be performed with dedicated tools, but time and cost increase significantly
Solution Approach 1:
Multiple downhole tools (cutting tool, drill, mill, packer) that would traditionally require separate trips are merged onto a single tool string. The flow control system enables each tool to be actuated in sequence or simultaneously as needed, completing multiple tasks in one trip and eliminating repeated trips to surface for tool changes
Solution Approach 2:
The tool string is designed with universal functionality to perform multiple different downhole operations (cutting, drilling, milling, sealing) using a single integrated system. The flow control mechanism provides universal actuation capability across all tools, allowing the same tool string to adapt to different tasks without returning to surface
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 multiple downhole operations to be performed in a single trip, improving productivity and efficiency by allowing controlled actuation of tools like drills, mills, and packers without uncontrolled activation of the cutting tool, thus reducing the need for multiple trips and enhancing the reliability of the tool string.
Implementation Method 1
The nozzle is configured to introduce a pressure difference in the fluid upstream of the nozzle and the fluid downstream of the nozzle
Implementation Method 2
A piston is axially movably mounted in the body. The piston is configured to move axially between a first position and a second position in response to fluid pressure
Implementation Method 3
Axial force may be applied by a set down weight and/or a ball drop
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2B
AI summary
A downhole cutting tool and method of operating the cutting tool. The cutting tool (10) has first and second flow pathways through the tool body (12) and a switching mechanism operated by axial force via weight-set or drop ball to control the opening of the flow pathways and direct fluid to the second flow path and operate the cutting mechanism (18). Fluid flow through the first pathway can be used to actuate a hydraulically operated tool mounted on the tool string below the cutting tool (10).