近钻头仪器电阻率

GW-Near Bit Geosteering Instrument
1. Brief Introduction
2. Technical Specifications
3. Service Capability
4. Service Performance
1.Brief Introduction
Near-bit measuring technology is a cutting-edge MWD and LWD technology, and also it’s the edge tool to proceed high-end drilling technical service.This instrument is mainly applied in thin reservoir horizontal well drilling, oil (oil and water layer) boundary drilling, etc. It increases payzone drilling rate, single well production and recovery factor , and also it reduces development and production cost, achieve the efficient oil field development.
The characteristic of its short size (only 1m long) let it can be install behind the bit directly , And receive the real time geologic parameter and borehole trajectory parameters from the position less than one meter to downhole .
System structure
Downhole tool
Surface equipment and software Data acquisition and drill floor display
Motor
Near bit sub
Short Hop
Transmitter Receiver
Battery
Gamma Probe
1m
Technical Parameters
Tool OD 6 ¾”Max Operating Temp 150°C Max. Pressure 20000Psi Continuous Operating
Times
>150h Short Hop Transmission
Distance
>20m Inclination
0 ~ 180°Inclination Measurement
Accuracy
±0.5°@INC>30°
Short Hop Communication Sub Near Bit Resistivity, Inclination &
Azimuthal GR Imaging Tool
✓Downhole tool communication setting module ✓Pulse signal decoding module
✓Azimuthal gamma borehole imaging module ✓Database module
✓Depth tracking module
✓Driller data display module
✓Logging data processing and curve
display module System software platform
✓High-power downhole turbine generator ✓Control instruction transmitting technology
based on flow rate regulation
✓Reliable positive pulser signal transmitting ✓Accurate measurements while pump on
Directional measurement module:
Measuring Range
Inclination 0 ～180°Azimuth Angle 0 ～360°Tool Face 0 ～360°Measuring Accuracy
Inclination
±0.1°Azimuth Angle ±0.25°Tool Face
±0.5°
✓Borehole imaging：8 sectors，each 45°✓Measuring range：0-380 API
✓Measuring accuracy：士3 API @ 50 API ✓Max temperature：150 ℃
✓Max pressure：20,000 psi
Directional Gamma module :
Frequency 1Mhz
Range Amplitude 0.1-100Ω.m Phase 0.1-200Ω.m
Accuracy Amplitude ±8% (0.1-25 Ω.m)；±2 s/m(>25Ω.m) Phase ±5% (0.1-30 Ω.m) ；±0.6s/m(>30Ω.m)
Depth Of Investigation Amplitude 32″Rxo=1Ω.m,R t=10Ω.m
55″Rxo=10Ω.m,R t=100Ω.m
Phase 20″Rxo=1Ω.m,R t=10Ω.m 34″Rxo=10Ω.m,R t=100Ω.m
Vertical Resolution Amplitude12″
Phase 8″Near bit Resistivity
Comparison with similar foreign equipment
Drilling equipment manufacturing plant
Equipment Capability
International R&D team (Houston R&D Center): There are two internationally renowned scientists, 15 professional doctorate and many related professional technicians make the research and development for the while drilling tools and technology.
Domestic R&D team :
3 senior engineers at professor grade , 2
technical experts and 67 service engineers.
Human resources
6 ¾”size tools
Suitable for 8½”-9½” hole
Other size tools would be available according to clients’ needs.
Finished 4 wells in Liaohe area, the total footage is 1336m, the total drilling time is 384.5h.Transmitter Receiver
Short Hop
Transmission Antenna GW-NB vs. wireline logging in Well Ma209X
GW-NB field application
Figure in blue for near-
bit instrument of
resistivity log curves ;
red for cable resistivity
log curve. “ Ma209-x ” well GW-NB vs. wireline logging in Well Ma209X
✓
GW-NB vs GW-LWD in Well Ma209X
“Du813-HXXX” Well。