Downhole Tubing Assembly for Real-Time Cement Annulus Sensing
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Solution Overview
Problem
Existing technologies lack effective methods to monitor and ensure the quality of the cement annulus in downhole operations, particularly in terms of cement distribution and contamination, which is crucial for sealing and preventing fluid migration in boreholes.
Innovation Solution
A downhole tubing assembly equipped with a sensor unit at its distal end, capable of measuring parameters such as pressure, density, flowrate, pH, and acoustic impedance, is used to monitor fluid circulation and cement placement in the annulus, allowing real-time detection of cement properties and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If post-cement-setting logging operations are performed to evaluate cement placement quality, then measurement precision of cement distribution is improved, but loss of time and productivity are worsened
Solution Approach 1:
The sensor unit is deployed within the inner tubing before cementing operations begin, positioned to detect cement as it exits the flow port. This preliminary positioning enables real-time monitoring during cement placement, eliminating the need for subsequent logging operations and resolving the time loss contradiction while maintaining measurement precision.
2Measurement precision
If multiple sensors are deployed to monitor various fluid parameters, then measurement precision of fluid properties is improved, but device complexity is worsened
Solution Approach 1:
The sensor unit integrates multiple detection capabilities (acoustic, temperature, pressure, density sensors) into a single multi-functional device. This universal approach allows comprehensive fluid parameter monitoring while consolidating hardware components, thereby improving measurement precision without proportionally increasing device complexity.
3Reliability
If real-time monitoring of cement placement is implemented, then reliability of cement seal quality is improved, but device complexity is worsened
Solution Approach 1:
The sensor unit is nested within the inner tubing, which itself is positioned within the bore-lining tubing. This nested configuration allows the monitoring system to be integrated into the existing downhole assembly without requiring separate complex structures, thereby improving reliability through real-time monitoring while minimizing the increase in overall 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
Enables real-time monitoring and evaluation of cement placement, reducing the need for post-cement-setting logging operations and ensuring the integrity of the cement seal by identifying contamination and optimizing fluid circulation parameters.
Implementation Method 1
Parameters of the circulating fluid determined by the sensor unit may include at least one of pressure, density, flowrate, pH, and acoustic impedance
Data Source
AI summary
A method of cementing a bore-lining tubing in a drilled bore includes providing an inner tubing for location within the bore-lining tubing. The inner tubing has distal and proximal ends, and a sensor unit at the distal end of the inner tubing. The inner tubing is translated into the bore with the sensor unit being operated to determine a parameter of the bore. Fluid is then circulated through the inner tubing, the flow port, and an annulus between the bore-lining tubing and the drilled bore with the sensor unit being operated to determine a parameter of the fluid. The fluid comprises a settable material, such as cement slurry, which at least partially fills the annulus between the bore-lining tubing and the drilled bore. The inner tubing is then translated out the bore-lining tubing with the sensor unit being operated to determine a parameter of the settable material in the annulus.