Sourceless LWD formation evaluation

July 19, 2012

Schlumberger has introduced NeoScope, a sourceless logging-while-drilling formation evaluation service based on pulsed neutron generator technology that eliminates the need for chemical sources and provides real-time measurements close to the bit to guide interpretation and decisionmaking in all drilling environments.

The service offers a full suite of sourceless formation evaluation measurements, including spectroscopy, sigma, neutron porosity and neutron-gamma density, as well as delivering gamma ray images and array resistivity measurements for well placement. A set of ultrasonic calipers and a full drilling mechanics package complete the measurement and interpretation suite.

‘With its compact design and neutron-on-demand technology, this service saves rig time, reduces risks and provides a comprehensive suite of petrophysical measurements,’ said Steve Kaufmann, president, Schlumberger Drilling & Measurements. ‘With more than 200 jobs conducted in the field test phase for customers in over 30 countries, the NeoScope service has demonstrated its ability to provide high quality data while lowering operational and technical risk.’

The NeoScope service has been field tested extensively for the last four years in a wide range of formations and environments, ranging from tight carbonates to conventional clastics, to validate the measurement response. The challenging measurement physics were also verified through extensive modeling and experimentation both in the laboratory and the field. A typical job run during the service field test phase cited by Schlumberger was the acquisition of a full suite of petrophysical measurements in a directional exploration well in Africa, where poor borehole conditions prevented wireline tools from reaching the entire interval of interest.

According to Schlumberger, the NeoScope measurements acquired helped save the customer seven days by eliminating the time and cost associated with chemical source deployment while providing the data required to successfully evaluate the well.



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