MRP-Q Nuclear Magnetic Resonance Logging system
Last-Release：2024-06-19 17:02:34 Font Size：T|T
Introduction
MRP-Q logging system is the latest logging system developed by Beijing Orangelamp Geophysical Exploration Co., Ltd.
Application of MRP-Q
Studying pore-size distribution and evaluating formation liquid producing capacity.
Hydrocarbon typing and oil-water interface determining. Formation parameters derived from the basic parameters measured by MRP:
Hydrocarbon typing and oil-water interface determining. Formation parameters derived from the basic parameters measured by MRP:
Formation permeability
Formation fluid
Pore -size distribution
Fluid viscosity.
Direct measured formation parameters :
PHIT or MSIGMPHI
MPHI
MBVI
MFFI
MRP-Q:
The spin echo method is used to measure the nuclear magnetic relaxation. It can eliminate the diffusion
effect on the measured results, improving the signal-to-noise ratio. This system can bring three advantages as below:
effect on the measured results, improving the signal-to-noise ratio. This system can bring three advantages as below:
superior signal-to-noise ratio
No requirement for the uniformity of magnetic field
Spin echo Impulse sequence
MRP-Q Interpretation model is similar to NMR porosity, permeability and bound water model. But it uses the dual-water model to detect oil and gas by combining with conventional logging data.
Component of MRP-Q
MREE – MR electronic enegy. This is an energy storage unit. The unit includes 10 capacitances. Quick-acting charging within every cycle for transmitting a high-frequency impulse.
MREP – MR electronic plant. Combining with power supply module,stimulate module, transmitter module, transmitter interface module,antenna interface module, pre-amplification module, B1 sensor. Providing high voltage radio-frequency pulse to transmitting antenna and achieving communication with ground system.
MRMD – MR magnetic detector. Nuclear magnetism sensor with 6’’ external diameter. It consists with relay assembly, host magnet, antenna,pre-polarized magnet. MRSN isa core component part of MRP-Q. It can form gradient magnetic field, transmit RF impulse and receive NMR signal.
Technical index
| Work environment: uncased hole | Mud effect: not in measurement range |
| Downhole fluid: drilling fluid, water, oil, air | Drape: no limited |
| Measuring position: middle | Signal: radio-frequency signal |
| Sensor: RF antenna | Maximum logging speed: 24 feet/min |
| Maximum number of echoes(NE): 500 | Minimum inter-echo spacing: 0.6ms |
| Resonant frequency: 9 | Length: 13.5m(includes MREP electronic plant) |
| Sensor external diameter: 152.4mm(6 feet) | Temperature resistance: 175 ° |
| Withstand voltage: 137.9Mpa | Minimum well diameter: 17.8cm |
| Maximum well diameter: 42.6cm | Maximum radius of investigation: 42.6cm |
| Limitation of mud resistance bunch: ＞ 0.02ohm | Cable top voltage: 120AC, 45W |
| DC power supply: 600VDC 3A | Transmitting duty cycle:18% |
Output index
| Porosity | T2 | |
| Range | 0-100pu | 0.5ms-2048ms |
Accuracy |
Maximum error: 5%(1pu) |
 |
| Repeatability | Porosity standard error: 1pu | |
| Vertical Resolution | 24” fixed point measuring | |
| Resolution | 0.5ms | |
| Measurement range | 750ms HQ; 500ms MQ; 360ms LQ |
