is designed for implementation of complex methods of radioactive and spectrometric pulsed neutron gamma logging: (2INGK-S) spectrometric pulsed neutron gamma logging, including (C/O) carbon-oxygen logging, (2INGK) pulsed neutron gamma logging, (SGK and GK) spectrometric and gamma-ray logging.
Complete tasks:
• an operational evaluation of the current oil-and-gas saturation of reservoir beds by an energy spectrums multi-channel recording by 2-probes of (GINR) gamma-ray inelastic scattering and (GIRZ) radiation capture, and also in addition time spectrum of an integral flow induced by gamma radiation within the range of interpulse times of fast neutrons by the method of spectrometric pulsed neutron gamma logging (2INGK-S, including C/O-logging);
• evaluation of neutron rock characteristics and estimation of collectors’ oil-and-gas saturation through the definition of the thermal neutrons lifetime (effective capture cross section) and the coefficient of water-filled porosity by 2-probes pulsed capture gamma-ray logging (2INGK);
• evaluation of the elemental composition of fluid and rock, including weight content of chlorine and hydrogen, concerned with mineralizing of formation fluid, as well as other primary elements that composing formation for a lithology differentiation;
• delination of fresh water inputs intervals in the oil-bearing strata, evaluation of direction flow of the fluid in violation of the integrity of the cement bond and finding radio-geochemical anomalies by gamma-ray log;
• quantitative estimation of natural radioactive elements containing – uranium (U), thorium (Th) and potassium (K) – in rocks during in the course of investigation of oil-and-gas wells for lithology differentiation by gamma-ray spectral log.
Features and advantages
• performing in total complex of nuclear-physical well logging methods in one trip;
• possibility of application not only an open hole and in the wells, cased with a casing 124 mm in diameter, but also in prospect in shanks and in the lateral holes (including horizontal), cased with a casing of 102 mm.
|
Range of hydrocarbon saturation index determination (Kng) % |
10-100 |
|
Limit of absolute measurement error Kng, % |
±5 |
|
Possible scintillational detector dimensions based on crystal LaBr3(Ce)(lanthanum bromide), mm, |
50х50 |
|
Permission in the line of Cs-137 for crystals of LaBr3(Сe) based on benefits, % |
up to 5 |
|
Measuring range of thermal neutron life, ms |
20-2000 |
|
Relative error of time thermal neutron life determination |
±2 |
|
Measuring range of water-filled porosity, % |
1-40 |
|
Type of applied pulse neutron generator |
ING-063 |
|
Measuring range of keeping radioactive elements, %: U Th K |
(1-100)·10-4 (1-100)·10-4 0.1-20 |
|
Measuring range of gamma energy, MeV |
0.06-7.0 |
|
Supply of the borehole tool, V |
200 |
|
Number of channels in match point |
1024 |
|
Number of registrable match points |
7 |
|
“Dead” time of measuring channel, ms, up to |
0.7 |
|
Logging speed, m/h |
50-70 |
|
Maximal operating temperature, °C |
120 |
|
Maximal operating pressure, MPa |
80 |
|
Diameter, mm |
74 |
|
Length, mm |
3200 |
|
Weight, kg |
40 |