Downhole Impulse Turbine for Water Breakthrough Detection
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Solution Overview
Problem
Well operators face challenges in controlling the production of fluid components in a wellbore, particularly in preferentially producing hydrocarbons while reducing or eliminating water production, due to changing fluid compositions over time.
Innovation Solution
A downhole flow control system that includes a rotor chamber and a rotor, where the rotational speed of the rotor is used to detect changes in fluid composition, and a flow regulator is adjusted based on these changes to control the flow of production fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional production equipment is used without real-time fluid composition monitoring, then the equipment structure remains simple, but the ability to preferentially produce hydrocarbons while reducing water production deteriorates
Solution Approach 1:
The impulse turbine measures fluid properties and detects water breakthrough autonomously as fluid flows through it, without requiring external power or control systems. The turbine's rotational speed naturally varies with fluid density and viscosity, providing self-service measurement capability that resolves the contradiction between improved productivity and avoided device complexity
Solution Approach 2:
The patent replaces complex electronic sensing and power systems with a mechanical impulse turbine measurement system. The turbine converts fluid flow energy into rotational motion, which directly indicates fluid composition changes, eliminating the need for complex electronic instrumentation while maintaining measurement capability
2Measurement precision
If real-time fluid composition monitoring is implemented to detect water breakthrough, then the precision of fluid composition detection is improved, but the device complexity increases
Solution Approach 1:
The impulse turbine performs measurement functions autonomously during normal fluid flow without requiring separate monitoring equipment or external power sources. The turbine's rotational characteristics inherently provide measurement data, achieving high measurement precision while avoiding additional device complexity
Solution Approach 2:
The impulse turbine serves multiple functions simultaneously: it measures fluid density, detects water breakthrough, and can indicate fluid composition changes. This multi-functionality achieves comprehensive measurement precision without requiring multiple separate devices, thereby avoiding device complexity
3Productivity
If flow regulator is continuously adjusted to optimize fluid production, then the productivity is improved, but the ease of operation deteriorates
Solution Approach 1:
The impulse turbine provides real-time feedback on fluid composition and water breakthrough detection, enabling automated or semi-automated flow regulator adjustments. This feedback mechanism improves productivity by optimizing fluid production while reducing manual operation complexity through clear operational signals
4Measurement precision
If impulse turbine is used to measure fluid properties and detect water breakthrough, then the measurement precision of fluid composition is improved, but the device complexity increases
Solution Approach 1:
The impulse turbine measures fluid properties autonomously as production fluid flows through it during normal well operation. The turbine's rotational speed and characteristics naturally respond to fluid density and viscosity changes, providing measurement precision without requiring complex powered sensing systems
Solution Approach 2:
The impulse turbine represents a simple, robust mechanical measurement device that can be deployed downhole without complex electronics or power requirements. Its simplicity and lack of moving electronic parts make it reliable and cost-effective, achieving measurement precision while minimizing device complexity
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 system effectively detects changes in fluid composition, such as the formation of emulsions, and adjusts the flow to maintain optimal production of hydrocarbons while minimizing water production, thereby improving well management and production efficiency.
Implementation Method 1
A portion of the flow is directed through a rotor chamber to rotate an impulse turbine
Implementation Method 2
A sensor may be used to detect changes in a rotational speed of the impulse turbine
Data Source
AI summary
A transition in the fluid composition of a production fluid is detectable downhole based on a rotational response of a rotor through which flow is directed. The transition is detectable, at least in part, based on different rotational speeds of different fluid compositions. The transition may be detected or confirmed by an anomaly in the rotational response (e.g., a temporary dip) due to an emulsion between two or more fluid components. The non-Newtonian behavior of the emulsion makes its presence easily detectable in a rotor chamber. These principles may enable a rotor to act not only as a power source but as a water cut sensor.