is designed for quick oil saturation estimating and rock ultimate composition due to multichannel registration of inelastic scattering/radiative capture energy spectra but also due to recording an additional time spectrum of induced GR integral flux within fast neutron pulses interval.

Description

For quantity reduction of round-trip operations and simultaneous

recording of several parameters, TzSP-O/C-90 tool can be produced as an integrated tool with the TzSP-GK-S-90 digital downhole gamma-ray spectrometry tool (100 mm diameter in complex) and also be completed with a thermometry channel.

Downhole tool is to be run with the log recorder Hector, Vulcan V3 and with tree-core cable.

Features and Advantages

• simultaneously-consecutive registration of 3 energy spectrums according to 512 quantization signal levels according to amplitude and summary gamma-radiation temporal spectrum according to 50 channels;
• the use of high-frequency impulsive (10 khz) fast neutron ING-06 radiator of increased power (more 108 n/sec) and operation resource more 200 hours;
• technological program package for measurements process control and application program package for primary C/O logging data processing.

Application field

Estimation of oil-and-gas saturation coefficient on value of the relative amplitude of C/O and Ca/Si anomalies taking into account layers lithology, neutron and effective porosity of the investigated collectors.

Measurement of inelastic scattering gamma-ray, radiation capture gamma-ray and epithermal neutron spacetime and energy distributions provides the principle conditions for calculating of partial contributions from the basic oil-, water- and rock-forming element nuclei (C, O, H, Si, Ca, Fe, Cl, etc.) as well as for calculating different relations associated by the correlation dependences with the filtration-capacity parameters, rock lithology and fluids (oil, water) which saturates them.

Specifications

Terrigenous reservoir oil saturation KH measurements range, %

1-100

Basic relative error limits of KH measurements under normal conditions, %

±7

Scintillation detector BGO (bismuth germanate) size, mm

50×150

50×120

50×100

Cs-137 line resolution, %

up to 12

Neutron generation frequency, kHz

10

Tool power supply, V

200

Time analyzer bandwidth, microsec

2.0

Width of the window time analyzer, ms

2

Number of registratable energy spectrum and channels in the spectrum

3×512

Number of registratable time spectrum and channels in the spectrum

1×50

“Dead” time of  measuring channel, ms, up to

3

Data transmission rate (through logging cable), kbaud

42

Tool retrieving speed, m/h

50-70

Max. operational temperature, °C

120

Max. hydrostatic pressure, MPa

60

Tool dimensions, mm:

diameter

length

 

100

3200

Weight, kg

50

Results

Examples of oil-saturated reservoir identifying by C/O logging diagrams

Certificate

The TzSP-C/O-90 tool is certified.