HPHT Multifinger Caliper

A multifinger caliper for the most hostile HPHT environment - digital electronics, 205 °C 1200 bar rated

The HPHT 40-finger Multifinger Caliper is based on READ’s existing MFC range, widely recognised in the industry for its high accuracy and measurement resolution, providing detailed inspection of the well bore and completion components.  Sensitive components have been protected using the latest flasking and heat-sink technology, enabling the tools to survive for at least 15 hours at their maximum rated temperature. Two versions of the caliper tool are available - one is run on electric line giving real-time data at surface, the other records identical data on a downhole memory which is recovered when the tool returns to surface. 

The 40 fingers of the HPHT tool, with hardened tungsten tips, individually measure any small changes in casing radius to within 0.003", providing clear and accurate measurement of corrosion, wear, scale deposits , deformation or other feature.  The fingers measure continuously across an ID range of 3" to 7.5" allowing various diameters of tubing to be logged during a single run in the well. These individual measurements are either transmitted to surface or recorded digitally in the downhole memory module. Tool orientation in the well is continuously recorded, thus enabling each finger measurement to be oriented relative to the borehole. The tools have also been run with a gyro in order to track  direction of movement at the sites of tubing deformation.

The caliper fingers are designed to collapse to tool body diameter to ensure that the tool will pass through restrictions during logging with no risk of damage to the fingers. Sensor fingers are opened and closed by command from surface, or by the pre-programmed memory.  Centralisers are run above and below the tool to ensure centralisation in the well bore.

See a  specification of the memory tool and the surface readout tool, or request a complete data sheet.

Key Benefits:

  • Rated to 205°C (400°F) and 17,600 psi (1213 bar) for up to 15 hours 
  • Continuous digital measurement across multiple tubing sizes
  • Fully supported by READ Well Integrity Analysis services

Applications

  • Monitoring of casing and tubing corrosion and wear
  • Evaluation of scale and planning of scale removal
  • Quantitative evaluation of tubular deformation or failure
  • Monitoring of well integrity - downhole jewellery inspection
  • Determination of exact location, orientation and numbers of perforations
  • Locating suitable packer and patch areas
  • Baseline logging of new completions
  • Time-lapse studies

Tool Specification - Surface Readout HPHT Multifinger Caliper

O.D. Max. 2.81” (71.4 mm)
Multifinger Caliper Length 12.24 ft (3.73 m)
Total Tool Length incl. 2 heavy duty centralisers 18.2 ft (5.55 m) 
Tool Weight 187 lbs (85 kg)
Maximum Pressure 17,600 psi
Maximum Temperature 205°C (400°F) for up to 15 hours
Radial Resolution 0.003" (0.076 mm) or better
Vertical Resolution at 30 ft/min 0.111" (2.82 mm) or better
Finger Coverage 40 fingers with 1 sensor each
Finger Contact Radius  0.05"
Measurement Range (casing/tubing ID) 3” – 7.5” (76.2 mm – 190.5 mm)
Recommended Logging Speed 30 ft / min (9.1 m/min)
Inclinometer & Azimuth 2 Inclinometer (X-Y) 
Inclinometer Deviation Accuracy Better than ± 2°
Inclinometer Rotational Accuracy Better than ± 5°

Tool Specification - Memory HPHT Multifinger Caliper

O.D. Max. 2.81” (71.4 mm)
Multifinger Caliper Length 13.94 ft (4.25 m)
Total Tool Length incl. 2 heavy duty centralisers 19.94 ft (6.07 m)
Tool Weight 212 lbs (95 kg)
Maximum Pressure 17,600 psi
Maximum Temperature 205°C (400°F) for up to 15 hours
Radial Resolution 0.003" (0.076 mm) or better
Vertical Resolution at 30 ft/min 0.111" (2.82 mm) or better
Finger Coverage 40 fingers with 1 sensor each
Finger Contact Radius 0.05"
Measurement Range (casing/tubing ID) 3” – 7.5” (76.2 mm – 190.5 mm)
Recommended Logging Speed 30 ft / min (9.1 m/min)
Inclinometer & Azimuth 2 Inclinometer (X-Y) 
Inclinometer Deviation Accuracy Better than ± 2°
Inclinometer Rotational Accuracy Better than ± 5°