A vacuum flask with a pump, also known as a geothermal vacuum flask tool, is a specialized device used in the production logging of geothermal wells. It is designed to withstand high temperatures and pressures, and to provide accurate measurements of various parameters within the well, including temperature, pressure, and flow.
Understanding the Key Features of Vacuum Flask with Pump
Thermal Decoupling and Temperature Compensation
One of the key features of the vacuum flask with pump is its ability to thermally decouple the internal flask temperature from the external well bore temperature. This is achieved through the use of a second temperature sensor, which is mounted on or near the pressure sensor within the tool. This allows for accurate temperature compensation of pressure sensor measurements, even when the external and internal temperatures are significantly different.
Sensor Protection and Exposure
The vacuum flask with pump includes sensors for measuring flow, which are protected from impact damage within a protective cage. These sensors are designed to maximize exposure to well bore fluid flow, in order to increase sensitivity to temperature changes. The tool also includes induction sensors for measuring the displacement of multiple spring-loaded mechanical fingers, which are used to identify material loss from corrosion, casing deformation from thermal cycling, and scale build-up within the casing bore.
Magnetic Field Generation and Casing Metal Loss Detection
The tool is typically designed to generate an alternating magnetic field, which is picked up by the tool’s receivers. Variations in the response of this field can infer change in mass, which can be used to detect casing metal loss from corrosion. The tool can also be paired with a Multifinger Caliper tool to resolve azimuthal variations and detect metal loss on the exterior of the casing.
Technical Specifications and Capabilities
Temperature and Pressure Ratings
The vacuum flask with pump is designed to withstand temperatures ranging from ambient to 800°F+ (430°C+), and to provide accurate measurements of temperature, pressure, and flow within the well. This high-temperature rating is achieved through the use of specialized materials and design features.
Sensor Protection and Response Time
The tool is also designed to mechanically protect the slender protruding sensor from impact damage, and to minimize the influence of the tool body’s temperature on the sensor’s temperature response time. This ensures that the measurements provided by the tool are accurate and reliable, even in the harsh downhole environment.
Examples and Applications
Some examples of vacuum flask with pump are the Vacuum Flasks – Down hole, Wireline logging, Geothermal from National Kworks, which are designed for use in geothermal wells and are capable of measuring temperature, pressure, and flow. These flasks are made of materials that can withstand high temperatures and pressures, and are designed to provide accurate measurements even in the presence of corrosive fluids.
Conclusion
In summary, a vacuum flask with a pump is a specialized device used in the production logging of geothermal wells. It is designed to withstand high temperatures and pressures, and to provide accurate measurements of various parameters within the well. The tool is equipped with temperature sensors, flow sensors, induction sensors, and a magnetic field generator, which allow for accurate measurements of temperature, pressure, flow, and casing metal loss from corrosion. This specialized equipment is essential for the effective and efficient exploration and production of geothermal resources.
References:
- Vacuum Flasks – Down hole, Wireline logging, Geothermal from National Kworks
- OSHA Sampling and Analytical Methods
- WKNCT Handbook
- Protocol for Equipment Leak Emission Estimates
- How do I prove my vacuum flask/isothermal bottle?
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