Optical Fiber Backscatter Control for Wellbore Pressure Stabilization
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Solution Overview
Problem
Current methods for optimizing wellbore performance, especially during the decline phase, are inadequate, leading to premature well closure and low recovery rates, as they fail to effectively monitor and control pressure fluctuations and fluid flow in existing infrastructure without significant modifications or costly enhancements.
Innovation Solution
A method involving the use of digital orthogonal backscatter signals from an optical fiber to control outlet and injection valves, allowing for continuous monitoring and regulation of fluid circulation, pressure stabilization, and increased production by optimizing the operation of wellbores during the decay phase without altering existing infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensors and monitoring systems are used to detect wellbore conditions, then the location of defects and degradation can be identified, but the operation of declining wellbores cannot be improved and recovery rates remain low
Solution Approach 1:
The system implements a closed-loop feedback mechanism where optical fiber sensors continuously monitor pressure and temperature conditions, the data is processed to identify wellbore degradation patterns, and control signals are automatically sent to adjustment devices (such as choke valves or injection systems) to modify flow conditions. This real-time feedback enables dynamic optimization of wellbore operation during the decline phase, converting static monitoring into active productivity enhancement
Solution Approach 2:
The invention replaces traditional mechanical pressure and temperature sensors with optical fiber-based sensing systems that use light propagation characteristics (such as Brillouin scattering or Raman scattering) to detect wellbore conditions. This substitution provides more precise distributed measurements along the wellbore length, enabling better identification of degradation zones and more accurate control decisions to maintain productivity
2Productivity
If wellbore monitoring and control systems are enhanced to improve decline phase operation, then recovery rates increase, but infrastructure complexity and cost increase
Solution Approach 1:
The optical fiber sensing system serves multiple functions simultaneously: it acts as both a communication conduit for wellbore data transmission and a distributed sensor array for pressure and temperature measurement. The same optical infrastructure used for telemetry is leveraged for production optimization, eliminating the need for separate sensing hardware and reducing overall system complexity despite the advanced capabilities provided
Solution Approach 2:
The system utilizes the existing optical fiber infrastructure already installed in the wellbore for its original communication purpose and repurposes it to provide sensing capabilities. The optical fiber itself serves the dual role of data transmission medium and measurement sensor, making the system self-sufficient and avoiding additional infrastructure installation that would increase complexity and cost
3Measurement precision
If optical fiber sensing systems are deployed to monitor wellbore conditions, then distributed pressure and temperature data can be obtained, but the distance between surface and bottom of deep wellbores exceeds the effective range of reflectometry systems
Solution Approach 1:
The system employs periodic pulsed laser excitation to generate Brillouin or Raman scattered signals that travel back to the surface detector. By using time-domain analysis of these periodic pulses, the system can determine the spatial distribution of pressure and temperature conditions along the entire optical fiber length, effectively extending the measurement range to match the full depth of deep wellbores
Solution Approach 2:
The invention transitions from point-by-point measurement approaches to distributed continuous measurement along the optical fiber length. By analyzing the temporal characteristics of backscattered light signals, the system converts a one-dimensional time signal into a three-dimensional representation of pressure and temperature distribution throughout the wellbore depth, effectively overcoming the distance limitation through dimensional transformation of the measurement data
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 approach enhances wellbore production, prevents premature closure, and increases recovery rates by stabilizing pressure and fluid flow, providing reliable and accurate data for improved well operation and extended infrastructure life.
Implementation Method 1
Generating two digital orthogonal backscatter signals from at least one light signal injected into the optical fiber
Data Source
AI summary
A method (1000) of improving the operation of a wellbore (1), said wellbore (1) including a drill pipe (2) in which a fluid (3) circulates and an optical fiber (5) positioned outside the drill pipe (2). The circulation of said fluid (3) is controlled at least in part by an outlet valve (4a) and/or an injection valve (4b). The method includes steps of generating (100) two digital orthogonal backscatter signals from at least one light signal, preferably polarized, injected into said optical fiber (5), and controlling (400) the opening of injection and/or outlet valves (4) depending on the two digital orthogonal backscatter signals.