Dual Induction Laterolog-8 Tool DIL-2C（1503XC）
1．SPECIFICATIONS
Maximum Temperature . . . . . . . . …….175 ℃ for 1 hour
Maximum Pressure . . . . . . . . . . . . . . . . 140 MPa
Diameter . . . . . . . . . . . . . . . . . . …. . . . .89 mm
Minimum Hole Diameter . . . . . . . . . . . .4.75 in.
Maximum Hole Diameter . . . . . . . . . . . .15 in.
Make-up Length . . . . . . . . . . . . . . . . . . .7.450 m
Maximum Tensile Strength . . . . . . . . . .9000 kg
Maximum Compressional Strength . . . .9000 kg
Weight .. . . . . . . . . . ……………. . . . . 154kg
Maximum Logging Speed . . . . . . . . . . 30 (m/min)
Curves Recorded:
Curves Computed Curves Available
RFOC: Resistivity from CFOC from Focused.
CFOC: Conductivity
RIIM : Resistivity from CILM Log
RILD: Resistivity from CILD
SP : Spontaneous CDPD
Measuring Range . . . . . . . . . . . . .
CILD: 0.5 to 5000 mmho
CILM: 0.5 to 5000 mmho
CFOC: 0.5 to 5000 mmho
SP : 0 - 200 mV
Sensitivity: . . . . . . . . .Approx. 1 mV/mmho for Induction and Focused Log
Accuracy . . . . . . . . . . ±2 mmho or ±3% of reading
Stability: . . . . . . . . . . ..±10 mmho at small signals or ±5% at large (Max.Temp.) signals (interval zero and calibrate set at max. temp.)
Reliability . . . . . . . . . . . . . . . . . . 98% with proper preventive maintenance
Radius of Investigation . . . . . . . . .. FOC: 9.5 in. (24.1 cm) for Rt/RM=100
FOC: 13.0 in. (33.0 cm) for Rt/Rm=10
ILM: 32.0 in. (81.3 cm)
ILD: 64.0 in. (162.6 cm)
Zero Point . . . . . . . . . . . . . . . . . bottom of tool
Measure Point . . . . . . . . . . . . . . .
FOC: 1.67 ft (0.508 m) above bottom of tool
ILM: 7.67 ft (2.337 m) above bottom of tool
ILD: 10.92 ft (3.327 m) above bottom of tool
SP: 10.92 ft (3.327 m) above bottom of tool
Wireline Requirements . . . . . . . . 7 conductor cable
Line Utilization . . . . . . . . . . . . . . AC Power 4 and 6
Switching： 1, 5, and 10
FOC Signal：1 and 5
ILD Signal ：2 and 5
ILM Signal ：3 and 5
SP ：7
Operating Voltage and Current . . . . 180 Vac, 60 Hz, 80 to 100 mA at cablehead
Detector of Sensor Type . . . . . . . . . Coil (Induction)
Electrodes (SP, LL-8)
Possible Combinations . . . . . . . . . . Compensated Densilog/Gamma Ray, or Spectralog/Caliper/Compensated Neutron/BHC Acoustilog
BRIEF DESCRIPTION OF SERVICE
The Dual Induction Laterolog-8 Instrument provides the conductivity data necessary to estimate the effects of mud filtrate invasion and to resolve true formation resistivity. Four measurements are recorded simultaneously:
Deep Induction ；Shallow Focused Laterolog；Medium Induction ；SP .
To achieve different diameters of investigation, the dual induction section consists of a transmitter (three coils) plus two receivers: IL Deep (three coils) and IL Medium (five coils). Proper combination of this eleven-coil system controls the focusing; the coil spacings, number of turns, and direction of turns determines the contribution to the total in-phase signals induced into the receiver coils. This multi-coil arrangement also cancels the mutual inductance between the transmitter-receiver circuits.
The Laterolog section is a multiple-electrode, constant-voltage device engineered to overcome the adverse effects of highly conductive drilling fluids, to detect and measure thin permeable beds in highly resistive formations, and to aid in the interpretation of invasion profiles.
Detailed descriptions of the individual induction and laterolog circuits are provided in Circuit Descriptions
