DNA Blast Group products

This natural gamma spectroscopy probe analyzes the energy spectrum of the gamma radiation of the isotopes naturally present in the formation surrounding a well. Subsequently, discrete windows centered on the maximum levels of K, U and Th are used to derive the concentration of these radioelements.

This probe provides a solution for cases where only one natural gamma record of basic total counts is required, and also provides a measurement of well fluid temperature, useful for correcting other records. Based on a ø 25 x 50 mm NaI (Tl) scintillation crystal detector coupled to a high performance photomultiplier tube, the probe has excellent sensitivity (± 1.2 cps / API unit) and provides a final result of high quality.

The formations surrounding the well are subjected to an alternating square wave voltage applied through the upper and lower injection electrodes. After each injection cycle, the resulting potential difference in a section of the formations is analyzed as it decays over time. The shape of this decay curve is related to the “chargeability” of the formations. A high load capacity indicates that the induced electro-chemical potentials can develop within the formations as a result of ion transfer between the pore fluids and the semiconductor metallic mineral grains present within the rocks.

This probe emits an ultrasonic wave train to scan the side wall of the well, thus providing a continuous 360 ° image. This information, combined with the data provided by the included orientation system, provides an extremely detailed and oriented acoustic image of the well wall. 

This probe generates an electromagnetic field in the well and measures the response of the formations to this field. The probe takes and digitizes the measurements both in phase and in quadrature to transmit them to the surface equipment. In this way, formation conductivity and magnetic susceptibility data can be obtained, even in dry wells or equipped with PVC.