Multi-finger Caliper (24 Finger) is a widely used in the field of oil logging, mainly used to measure the geometric shape and inner wall condition of the wellbore, to evaluate the integrity, corrosion, deformation, rupture and other damage conditions of the casing.
Its measuring fingers are usually of different types such as 30, 40, and 60 fingers, capable of measuring the wellbore from multiple angles, providing more comprehensive wellbore diameter data. Its measurement principle is based on physical contact measurement. That is, after the measuring finger comes into contact with the well wall, the displacement change is converted into an electrical signal through the displacement sensor. The ground receives and decodes it to generate a three-dimensional image or cross-sectional view of the well wall. This technology can provide high-precision well diameter data and is suitable for casing inspection in various complex well conditions.
The types of multi-finger calipers (24 Finger) mainly include the following
◆ On the Base of the Finger to Classify
24 Finger
With 24 caliper fingers, it is suitable for smaller casing diameters, providing high resolution and accuracy.
40 Finger
With 40 caliper fingers, it is suitable for Medium-sized diameter casing, providing a wider measurement range and higher accuracy.
60 Finger
With 60 caliper fingers, it is suitable for larger casing diameters, providing the widest measurement range and the highest accuracy
◆ On the Base of Measurement Method to classify
Surface Readout Type
The measurement data is read and analyzed on the ground, it is suitable for simple wellbore monitoring.
Memory Type
The logging data is stored in the downhole tools and is read and analyzed after the tools return to the surface, it is suitable for monitoring complex wellbores.
◆ On the Base of Software Support to Classify
Warrior Logging Software
It supports a variety of multi-finger caliper tools, correcting the eccentric logging readings, and providing various output options, such as correcting image graphs, correcting maximum diameter, correcting minimum diameter, etc.
Characteristics and Advantages
◆ Characteristics
High-Precision Measurement
Multi-finger Caliper (24 Finger) can precisely measure the inner diameter of the casing and provide high-quality measurement data.
Multi-finger Design
Through the synchronous operation of multiple measurement fingers to obtain the detailed information about the internal geometry of the wellbore
Three-Dimensional Imaging
Through the multi-finger wellbore interpretation software to display the actual condition of the inner wall of the tested casing.
Multi-functional Integration
It can be connected with other various tools to acquire a multiple logging data in a single run.
◆ Advantages
High-Precision Measurement
It can simultaneously measure the diameters at different positions of the wellbore through multiple independent measuring fingers, providing the high-precision wellbore diameter data. Compared with the traditional single-finger wellbore logging, multi-finger calipers can more accurately capture the minute changes in the wellbore wall, such as local deformation, cracks or corrosion.
Multi-Parameters Measurement
It can not only measure well diameter, but can also be combined with other logging techniques (such as acoustic logging, etc.) to provide multi-parameter data such as well temperature, magnetic well diameter, and magnetic weight, to achieve a comprehensive evaluation of the wellbore condition.
Beyond borehole diameter, the tool can be run in combination with other logging technologies-such as acoustic logging-to deliver multi-parameter data including borehole temperature, magnetic caliper, and magnetic weight, enabling a comprehensive assessment of casing integrity.
Well-adapted
It is applicable to various well types, including horizontal wells, vertical wells, high-sulfur wells, gas storage wells, etc., and adapt to complex environments such as high temperature, high pressure, and hydrogen sulfide content.
Ease of Operation
The measuring finger of the multi-finger caliper is designed for easy disassembly and replacement, with simple operation, it can be suitable for long-term use and maintenance.
Conclusion
The Multi-finger Caliper (24 Finger) is a high-precision and multi-functional downhole logging tool, widely used in the oil and gas industry for casing damage detection, perforation quality assessment, wellbore stability assessment and other fields. The advantages lie in providing high-precision well diameter data, supporting multi-parameter measurement, and having good adaptability and ease of operation. With the continuous development of technology, the application prospects of multi-finger calipers in complex well conditions will be even broader.
Each type of multi-finger caliper offers each has advantages in the oilfield logging and are suitable for different well conditions and measurement requirements. Choosing the appropriate type of multi-finger caliper can enhance the accuracy and efficiency of measurement, optimizing the management and production of wells.
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