Subterranean Cement Activation Devices for Setting Control
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Solution Overview
Problem
Existing cementing operations in subterranean zones face challenges in monitoring and controlling the setting of cement slurries, particularly due to the harsh alkali environment and electromagnetic noise, which can damage sensors and reduce their effectiveness.
Innovation Solution
The use of Micro-Electro-Mechanical Systems (MEMS) devices embedded in cement slurries that can release activators to accelerate the setting process and include sensors to monitor parameters like moisture content, temperature, and pH, allowing for on-command cement delivery and real-time monitoring without the need for continuous power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active electronic moisture sensors are embedded within cement, then moisture content can be monitored, but the highly alkali environment damages the electronics and electromagnetic noise interferes with operation
Solution Approach 1:
The patent replaces electronic moisture sensors with a mechanical/physical method: measuring the dielectric constant of the cement slurry. The dielectric constant changes predictably with moisture content, providing a non-electronic means of measurement that is immune to alkali damage and electromagnetic interference.
Solution Approach 2:
The patent uses the change in dielectric constant as a parameter to infer moisture content. Instead of directly measuring moisture with electronic sensors, the system measures the dielectric constant (which changes with moisture) and calculates moisture content from this parameter, avoiding electronic components in the harsh environment.
2Loss of information
If internal batteries are used to power sensors, then data transmission is enabled, but sensor size increases and useful life decreases
Solution Approach 1:
The patent replaces battery-powered electronic sensors with a dielectric measurement system that requires no internal power source. The measurement is performed by external equipment, eliminating the need for internal batteries and their associated size and life limitations.
3Productivity
If cement slurry setting rate is accelerated, then wellbore stabilization is improved, but control over setting timing becomes difficult
Solution Approach 1:
The patent incorporates retarders into the cement slurry formulation before placement, which preliminarily delay the setting reaction. This allows the slurry to be pumped and positioned without premature setting, after which the setting process is allowed to proceed naturally or can be accelerated by removing the retarder, providing controlled timing.
Solution Approach 2:
The patent uses dynamic control of the setting rate through adjustable retarder concentration and type. The setting characteristics can be modified by changing the chemical composition, allowing optimization for different pumping rates, wellbore conditions, and setting requirements.
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 the control and monitoring of cement setting, improving the integrity and longevity of cement seals by allowing tailored cement properties and passive sensor operation, reducing maintenance costs and extending service life.
Implementation Method 1
the dielectric constant of the cement slurry changes as the moisture content of the cement slurry changes
Data Source
AI summary
The present disclosure is directed to a system and method for managing cement in a subterranean zone. In some implementations, a method of cementing in a subterranean formation includes positioning a cement slurry including a plurality of activation devices in a wellbore. The activation devices configured to release an activator that increases a setting rate of the cement slurry. A signal is transmitted to at least a portion of the cement slurry to activate the activation devices. The activation device releases the activator in response to at least the signal.