Gullet Mandrel for Laminar Flow and Control Line Simplification
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Solution Overview
Problem
Conventional downhole valves in the oil and gas industry face challenges such as complex wellhead setups, limited scalability due to separate control lines, and safety hazards from high surface pressures, particularly in deep wells, and lack effective control sensors for precise operation.
Innovation Solution
A gullet mandrel system with exterior gullets configured to promote laminar fluid flow and prevent slug flows, coupled with a downhole valve, allowing for efficient fluid management in wellbores through optimized fluid flow patterns and reduced complexity in control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional hydraulic valves are used with separate control lines for each downhole valve, then valve control is achieved, but device complexity and scalability are limited
Solution Approach 1:
Multiple separate control lines are merged into a single control line that serves all downhole valves. The system combines valve actuation and pressure communication functions into one integrated control line, eliminating the need for separate lines to each valve.
Solution Approach 2:
The single control line performs multiple functions: it acts as a pressure communication line for actuating all valves, a return line for pressure equalization, and a universal control pathway for the entire valve system. This multi-functional design replaces the specialized separate control lines.
2Adaptability or versatility
If multiple separate control lines are used for each downhole valve, then individual valve control is possible, but the number of downhole valves is practically limited
Solution Approach 1:
The control line is designed as a universal multi-functional line that can serve any number of downhole valves along the tubing string. It provides pressure communication, actuation, and return functions for all valves simultaneously, removing the practical limit on the number of valves.
Solution Approach 2:
The system transitions from a one-to-one control relationship (one line per valve) to a one-to-many relationship through the use of pressure wave propagation along the single control line. Control signals propagate dimensionally along the length of the line to reach multiple valves.
3Ease of manufacture
If conventional cylindrical mandrels are used, then manufacturing is simple, but fluid flow optimization is insufficient
Solution Approach 1:
The mandrel surface is modified with localized features (gullets or grooves) at specific positions to optimize fluid flow. These local modifications create controlled turbulence and enhance mixing or flow distribution in specific regions while maintaining the overall cylindrical shape for ease of manufacture.
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 gullet mandrel system enhances fluid flow stability and scalability, reduces operational complexity, and improves safety by enabling precise control and increased efficiency in fluid injection and production operations, including gas-lift and enhanced oil recovery processes.
Implementation Method 1
The gullets may direct movement of fluid exterior to the tubing string and help force fluid into a laminar or linear flow pattern and prevent the formation of slug flows
Data Source
AI summary
The present disclosure provides a gullet mandrel for fluid flow optimization in a wellbore. The gullet mandrel may be coupled to a downhole valve, such that a tubing string in a wellbore will have a plurality of valves coupled to a plurality of mandrels. Each gullet mandrel may have a valve recess and one or more gullets (or grooves) located in an exterior portion of the mandrel body. The gullets may have a wide variety of configurations, and may be formed in a portion, a majority, or substantially all of the mandrel. The gullets may direct movement of fluid exterior to the tubing string and help force fluid into a laminar or linear flow pattern and prevent the formation of slug flows and/or lessen the problems encountered by slug flows. The disclosed gullet mandrel may be used in any fluid injection or production operation, such as gas-lift operations.