Logging

The XY-CALIPER tool is a motorized instrument. It links two opposite arms together forming a dual-caliper measurement, called XY Caliper. The two caliper signals are generated by using high resolution and high precision sensors. The nominal casing diameter range covered is between 10 and 150 cm.

The pressure and temperature tool is commonly used in the oilfield, geothermal or mining wells alike. It records the temperature and pressure gradients in a well. The temperature log is interpreted by looking for anomalies or departures from the reference gradient. This reference may be the geothermal gradient, a log recorded before production started or a log recorded with the well shut-in. Most of these anomalies are related to the entry of fluid in the well or fluid exit into the formation. Since temperature is also affected by all surrounding material, including the material outside the casing, a temperature log is sensitive both to the borehole, the formation and the casing-formation annulus. Since temperature takes time to dissipate, temperature usually gives information about the behaviour of the well over a longer period of time than other measurements.

The Acoustic borehole Imager records a 360º unwrapped 3D image of the borehole wall by transmitting ultrasound pulses from a rotating sensor and recording the amplitude and travel time of the signals reflected at the interface between mud and formation (borehole wall). The tool can work both in open and cased holes, giving crucial information in both cases.
In cased hole, the tool along with sophisticated algorithms and real time processes are also implemented to extend the possible tool applications to casing thickness measurement, corrosion evaluation and measurement behind a PVC casing.

The Cement Bond Log instrument acquires an omnidirectional, high-resolution full-wave acoustic data in cased and open holes. It accurately infers directly the cement quality from the degree of acoustic coupling of the cement to the casing and to the formation.
It operates on the principle that acoustic amplitude (in millivolts) is rapidly attenuated in good cement bond but not in partial bond or free pipe.

Adapted to the highest industry standards, the Multifinger Caliper is a mechanical downhole well logging tool. Its main function is to detect deformation, bending, fractures, perforation and inside corrosion of the casing with 40 measuring caliper fingers. Measuring fingers and centralizing fingers are opened and closed by a motor, ensuring the tool centralization during the acquisition. Loaded with springs, measuring fingers move along the inner casing wall and maintain close contact with the wall.