INDUCTION BED FRACTURE DIPMETER NIPT-1
It is designed to determine bed slope angles and bed dip azimuth, rock stratification and fracturing in oil/gas, core-parameter and engineering-geological wells including inclined horizontal wells.
The dipmeter is used with any-type logging stations which are equipped with any three-core armored cable.
Featues and advantages
- Large radial depth of focused circumferential scanning sounding of the near-borehole space;
- High reliability of bed elements measurements, of fractures and other planes of rock anisotropy both in vertical wells and in inclined horizontal ones;
- Identifying of sub-vertical and vertical fractures including the fractures which do not cross the bore hole; and of picking out of co-ordinates of their spatial orientation within the near-borehole space of up to 1 m in diameter.
Specifications
Recorded parameters
A - difference between rock bed longitudinal and transversal specific electrical conductivity (SEC);
C and B - instantaneous values of A parameter in an azimuth sector 5o towards the north and east directions
Measured characteristics
Measuring ranges, grad.:
- angles of bed dips, fractures
- azimuth of bed dips, fractures
|
0÷90
0÷360 |
Measurement errors, grad.:
- angles of bed dips, fractures
- azimuth of bed dips, fractures
|
±1,5
±5 |
| SEC range of the rocks under study, mMho/m
|
1,5÷1000 |
Apparatus parameters
| Measuring sonde length, m | 1,0
|
| Operating frequency of scanning, kHz | 225
|
| Rotation speed (of circumferential scanning), re./sec | 7 |
|
Diameters of the boreholes under study, mm | 76÷300
|
| Maximum pressure/temperature, MPa/grad. | 60/120
|
| Maximum logging velocity, m/hr. | 1000
|
| Dimensions, mm: length/diameter | 4200/60
|
| Mass, kg | 35
|
Results of fractured zones allocation using NIPT data in the well # 89 of Yurubchenskoye oil field in Krassnoyarski kray
|
