Downhole Temperature Control via Joule-Thomson Pressure Drop
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Solution Overview
Problem
Current methods for controlling downhole injection temperature in oilfield applications lack the ability to effectively adjust the temperature of fluids during injection, which is crucial for optimizing the performance and interpretation of treatments in subterranean formations.
Innovation Solution
The method employs the Joule Thomson effect by using a pump, a bottom hole assembly with temperature sensors, and fluid additives to control the pressure drop of the fluid, allowing for precise adjustment of downhole injection temperature through the combination of pump rate, orifice control, and additive composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the downhole injection temperature is not controlled, then the treatment effectiveness cannot be optimized, but the temperature control system increases device complexity
Solution Approach 1:
The patent implements a feedback control system where downhole temperature is measured by a temperature sensor and the measurement is transmitted to surface equipment. The surface equipment then adjusts the pump rate based on the temperature feedback to maintain the desired downhole injection temperature, resolving the contradiction between treatment effectiveness and system complexity through intelligent control
Solution Approach 2:
The system uses the natural Joule-Thomson cooling effect of the injection fluid itself to control temperature, rather than requiring external heating or cooling equipment downhole. The fluid's own thermodynamic properties are exploited to achieve temperature control, reducing the need for complex active temperature control systems
2Productivity
If the pump rate is increased to improve productivity, then more fluid can be injected, but the downhole temperature becomes harder to control
Solution Approach 1:
The patent employs dynamic adjustment of pump rate based on real-time downhole temperature measurements. The pump rate is not fixed but is continuously modified to maintain optimal temperature conditions, allowing the system to adapt to changing conditions and maintain temperature control across a range of productivity levels
Solution Approach 2:
The system changes the operating parameters (pump rate, injection pressure) based on downhole temperature measurements to maintain optimal injection conditions. By dynamically adjusting these parameters, the system can maintain temperature control while operating at different productivity levels
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 enables accurate control of downhole injection temperature, enhancing the performance of injected fluids and improving the accuracy of treatment interpretation by optimizing the temperature conditions during fluid injection.
Implementation Method 1
This method employs the Joule Thomson effect by using a pump, a bottom hole assembly with temperature sensors, and fluid additives to control the pressure drop of the fluid, allowing for precise adjustment of downhole injection temperature
Data Source
AI summary
Methods and apparatus for using a fluid within a subterranean formation comprising forming a fluid comprising a fluid additive, introducing the fluid to a formation, observing a temperature, and controlling a rate of fluid introduction using the observed temperature, wherein the observed temperature is lower than if no observing and controlling occurred. A method and apparatus to deliver fluid to a subterranean formation comprising a pump configured to deliver fluid to a wellbore, a flow path configured to receive fluid from the pump, a bottom hole assembly comprising a fluid outlet and a temperature sensor and configured to receive fluid from the flow path, and a controller configured to accept information from the temperature sensor and to send a signal.