
The Measurement While Drilling (MWD) System consists of directional probe, pulser, and surface system. The directional probe features high vibration resistance design and configurable encoding/decoding methods including PPM, M-ary, and combination codes. The pulser system uses direct-drive DC motor, suitable for high flow rate (85L/s) operations. High pass-through rate for lost circulation materials with strong resistance to blockage (140kg/m³). The surface system utilizes integrated platform framework with data acquisition, processing, display, and storage functions, compatible with downhole instruments from different manufacturers, encoding methods, and measurement schemes.
Ø High vibration resistance ≥25g, 20% improvement over comparable systems
Ø Minimum decoding amplitude of 3psi based on adaptive filtering algorithm
Ø Superior cemented carbide materials with strong erosion resistance
Ø Intelligent downhole condition assessment mode and low-power circuit design for power conservation
Ø Dual battery intelligent management mode for reduced operating costs
| System Specifications | |||
| OD | Φ48mm | ||
| Tool Length | 5.8m or 6.9m (with gamma) | ||
| Max. Working Pressure | 25kpsi | ||
| Working temperature | -40~175℃ | ||
| Battery Life | ≥200h(typical working conditions) | ||
| Shock | 1000g@0.5ms | ||
| Vibration | 25g RMS | ||
| Measurement Parameters | |||
| Natural/Azimuthal Gamma Sensor | |||
| Parameter | Range | Sensitivity | Accuracy |
| Gamma | 0~1000API | Natural 1.97CPS/API Azimuthal 0.52CPS/API | ±5%F.S.@150℃ ±10%F.S.@175℃ |
| Directional Probe | |||
| Parameter | Range | Resolution | Accuracy |
| Inclination | 0~180° | 0.1° | ±0.1° |
| Azimuth | 0~360° | 1.0° | ±1.0° |
| Toolface | 0~360° | 1.0° | ±1.0° |
| Temperature | 0~175℃ | 0.1℃ | ±0.5℃ |
| Magnetic field | 0~100μT | 0.01μT | ±0.075μT |
| Magnetic dip | -90~90° | 0.1° | ±0.15° |
| Surface System | |||
| RFD | ATEX Zone 1, CE certified | ||
| Surface Processor | 110/220V power input, UL&CE certified | ||
| Surface Transmission | Cable bus/Wireless communication | ||
The SNM-MWD/LWD System was deployed in the horizontal section of well Zi201H69-11, facing challenges including high drilling fluid density, high downhole temperature, large formation dip angle variations, and long horizontal section. Using a "rotary pulser + HT battery pack + HT probe + HT azimuthal gamma" tool string, it broke two records in PetroChina's Zi201 block:
Ø Highest footage record for conventional geosteering in single trip: 811m
Ø Longest single-trip usage time record: 290h

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