support of oil and gas
wells drilling
Complex Corsair 8АД73

Solve the problem

  • Lithological dismemberment of the section
  • Determination of the ratio and type of porosity of rocks
  • Allocation of permeable layers
  • The calculation of the elastic moduli of rocks
  • The calculation of the direction of anisotropy according to the cross-dipole probe

Advantages

  • Eight receiving stations provide maximum accuracy of calculations in comparison with two-channel equipment, such as AVAC, MAC, etc.
  • The low frequency of the dipole emitter (1.8 kHz) allows to reliably determine the parameters of transverse waves without correction for the velocity dispersion
  • The diameter of the device 73mm allows you to work in small diameter wells (95 mm) and through the drilling tool
  • Work on a three-core geophysical cable

The composition of the device
Receiver module 
Eight 4-channel stations provide registration of wave packets

Emitter module
Two monopole and cross-dipole radiator

Own software "Optimus-Interpreter" for processing recorded materials

Scope:

  • Separation of p, S and St wave velocities from the monopole emitter to obtain energy, elasticity, porosity and permeability coefficients.
  • Obtaining the speeds of fast and slow transverse waves
  • Determining the acoustic anisotropy and the azimuthal orientation
  • Determination of the speed of fast and slow transverse waves and the orientation of their vectors

Processing step:

1. Preprocessing of data from the device memory, depth-linking.
2. Calculation of interval time of longitudinal, transverse and Stoneley waves.
3. Analysis of the results, the formation of the report.

An example of a tablet processing

It should be noted a good coincidence of the direction of propagation of the fast transverse wave determined by the cross-dipole acoustic logging, and the direction of the maximum horizontal voltage determined by the electric MicroScanner.

Applied algorithms

Calculation of interval time by STC (semblance)
Construction of dispersion map of velocities
The determination of the direction of anisotropy by the method of Alford

Comparison 8АД data MPAL

  • Interval time of longitudinal waves according 8АД and MPAL well agree among themselves 
  • the difference between them does not exceed 5%

  • Interval times of the fast and slow shear waves according 8АД and MPAL well agree among themselves 
  • the difference between them does not exceed 10%

  • The difference in the direction of propagation of the fast transverse wave is mainly 15 degrees
  • With the direction of maximum horizontal stress, determined according to the EMS, better aligned the azimuth of the fast propagation of the shear wave is obtained according Karsar 8АД.

 

Table of characteristics:

8АД73 the device consists of the Assembly of the devices KORSAR – hotel, providing simultaneous registration of a wave packet from a monopoly, X-dipole and Y-dipole source of acoustic radiation. The device is designed to work with a three-core geophysical cable up to 7000 meters long and can be used in wells filled with fresh, salt water or oil-based washing liquid.

Параметр Значение
Диапазон измерения времени пробега акустической волны
DTP
DTS
130…820 мкс/м
230…1800 мкс/м
Вертикальное разрешение
Стандартное
Высокое
1.4м
0.2м
Скорость записи 400 м/ч
Диаметр скважины 95…400мм
Максимальная температура 125°С
Максимальное давление 100 мПа

 

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