Products & Services
Direct Systems Northseeker [DS-Northseeker]
The instrument itself is the smallest North Seeking Gyro on the market. It incorporates the latest gyro and accelerometer technologies, in a compact and rugged design. Combined with advanced electronics and calibration software the instrument provides high accuracy performance, coupled with ease of use and affordability.
The gyro sensor is a Two-degree-of-freedom, dry flexure tuned rotor gyro. The gyro provides electrical signals which are proportional to the angular rates about the two axes, orthogonal to the spin axis on the rotor.
The DS-Northseeker can calculate the component of the earth’s horizontal rate of rotation seen on each gyro axis relative to its precise known latitude at the commencement of a survey. These measurements are then used to determine the boreholes direction relative to True North.
System:
The system consists of a DS-Northseeker instrument which can run on either an electric wireline connected to a surface power supply and PC, or in memory mode on slick / braided line or in drop mode.
Features:
- Conductive Wireline mode
- Memory Multi-shot Mode
- Fast Traverse Speed 60m/min
- Calibrates Whilst Operational
- Accuracy to 0.3% Measured Depth
- Smallest North Seeking Gyro on the market and eliminates the need for surface orientations.
- 6 years proven reliability from manufacturers service division
Wireline Mode: Operation is fast and efficient. The instrument is placed in the borehole and ran to the required depth for the commencement of a survey. Within minutes of reaching the start point, the survey can commence, with real time diagnostics and communication with the instrument. In this format the instrument is also very efficient in checking the orientation of wedges and quickly checking the results of directional motor work.
Memory Mode: offers a plethora of options for the borehole survey.
- The instrument can be ran into the borehole on rig slick-lines that have counters attached
- Can be seated in the rods to survey as they are being withdrawn from the borehole
- 40 hours gyro memory operational capability (programmable hold off, shot interval)
Survey Speed: Can be traversed at the rate of 60m/minute whilst operational / Non operational. Normal stationary gyrocompass survey recording stations take ~10 seconds to obtain.
In-hole Calibration: Takes one minute to effect whilst the instrument is operational. This can be conducted for every survey station or at intervals as determined by the operator to effect a more efficient survey.
Accuracy: Each survey station is an individual recording of a gyrocompass position. Manufacturer quotes accuracy of 0.3% for measured depth. The advantage of an individually recorded station is that surface orientation or drift errors cannot be carried through the data set or be exacerbated as occurs with other instruments.
Software: User friendly, with state of the art diagnostic applications so that the operators can in real time assess the operation of the instrument or post survey diagnostics can be performed remotely by management or if need be the manufacturer. The interfaces are easy to navigate and can be used for planning, projections, or show instantly how close the boreholes are to known infrastructure.
6 Years proven service history from the manufacturers affiliated survey division which is base in the oilfields of the USA.
The next phase of its development will take the DS-Northseeker into a continuous running platform. There will also be a modulated version of the instrument that will be able to survey horizontal boreholes.
Instrument Specifications
- Inclination: +/- 0.1° Azimuth: +/- 0.35° {Dip range: -90° to -45° Degrees}
- Inclination: +/- 0.1° Azimuth: +/- 1° {Dip range: -45° to -30° Degrees}
- Positional Uncertainty: 0.3% of Measured Depth
- Max Borehole Survey Travel Speed: 60m/min
- Temperature: 4-93°C (without thermal shield), 0-204°C (with thermal shield)
Borehole Gyroscopic SRG
Traditional Surface Recording Gyroscopic (SRG) system with many years of proven field service. Suitable for open or cased boreholes. surface orientation bearings can be picked up by DSA personel or the prefered surfce surveyors of the client.
Goodrich/Humphrey DG-69
- X-Y Inclinometers (XY) 0 to 90 degrees +/-.5 degrees Gyro
- (Goodrich DG-69 or WellNav) 0 to 45 degrees from vertical +/-1 degrees
Magnetic Survey Instrumentation {3 Component Magnetic Survey, Steering, Wireline survey}
- Inclination: +/- 0.1o
- Raw Azimuth: +/- 1.0o
- Pressure Case OD: 1 3/4"
- Pressure Rating: 20000 psi
- Parameters Displayed: Inc, Az, TF, Mag Dip, Btot, B(x,y,z), G(x,y,z), Temp,
Sensors
- DMS Triax accelerometer & magnetometer sets
- Temperature: 0 - 125oC
- Shock/Vibration: 1000g, 20g rms 5-500Hz
Surface components of Equipment
- Wireline Power Supply
- Rig Floor Display: Transflective LCD with backlight, Sealed to IP65
Reflex Ez-track
- Azimuth 0º to 360º ± 0.35º
- Dip ± 90º from horizontal ± 0.25º
- Magnetic field strength 0 to 100,000 nT ± 50 nT
- Magnetic dip ± 90º from horizontal ± 0.25º
Steering
With the wireline steering system provided by Direct Systems continuous directional cuts have been conducted successfully at depths of up to 2100m, and for cut lengths of up to 65m.
The advantage in Directional Steering is that the high side tool face of the Navi Motor can be precisely know at all times through the cuts and movements on both Inclination and Azimuth can be monitored real time which enables dynamic changes to be administered to the settings. Doglegs can easily be calculated and monitored. Required borehole movements can be made in the borehole whcih reduces downtime for repeat cuts and missing required targets.
Acoustic Borehole Televiewer
The Acoustic Borehole Televiewer provides continuous logs of oriented, unwrapped images of borehole walls. Further processing allows for the computation and display of standard information on fractures and other geological features. The Acoustic Televiewer can be run in both clear and opaque mud.
Operating Conditions: Fluid filled boreholes. Max Pressure: 200 bar, Max Temperature: 70ºC, Borehole Diameter Range: 50 to 400 mm (depending on borehole fluid conditions)
- Dimensions: Length: 2.10 m, Diameter: 42 mm
- Sampling density : 90, 120, 180 or 360 per revolution
- Resolution 1-3mm (logging speed, borehole fluid, & wireline length dependant)
- Operational speed: 1.5-->3 m/min
- 3-axis magnetometer - Azimuth accuracy: +/- 2.5º
- 3-axis accelerometer - Inclination accuracy: +/- 0.4º
- Log Parameters:
- 360° oriented Travel Time Image
- 360° oriented Amplitude Image
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Borehole Design and Monitoring
- 3D graphical software (e.g. Drillog or Surpac)
- Independent assessment of borehole survey data.
Topography and Surface Surveying
- Leica GPS or Total Station
Petro-Physical Borehole Logging
Natural Gamma, Conductivity/Magnetic Susceptibility, Side Wall Density Sonde, Spectral Gamma, 3 Arm Caliper
Mag Suss/Conductivity
- Sonde length 1.90 m
- Sonde diameter 45 mm
Induction/Conductivity
- Inter-coil spacing: 50 cm
- Operating frequency: 100 kHz
- Measuring range: 1 to 3000 mS/m ( 0.33 to 1000 Ωm)
- Accuracy: 3% for range 100 to 1000 mS/m
- 10% for range 1000 to 3000 mS/m
Mag. Susc.
- Inter-coil spacing: 25 cm
- Operating frequency: 2 kHz
- Measuring range: 10-4 to 2 SI unit
- Accuracy: 3%
Natural Gamma
- This sonde uses a Sodium Iodide scintillation crystal coupled to a photomultiplier to detect natural gamma radiation.
- The range of energies detected by the sonde is from 65KeV (the lower threshold of thesonde) and upto 2.6MeV, the highest naturally occurring radiation.
Sidewall Density Sonde
This combinable sonde is suitable for quantitative formation density measurements in uncased holes. It uses a gamma ray source and a set of two detectors at different spacing to detect the gamma rays scattered by the formation.
- Length/Diameter: 2.06 m/ 54 mm
- Detector (NaI) spacing: 47 and 25 cm.
- Source: 100mCi 60Co
- Density Range: 1-4 g/cc
- Calliper: 60 to 350 mm
- Max Pressure/Temp: 20 MPa/80ºC
Spectral Gamma
The spectral gamma sonde can operate in both spectral and 5 windows mode which helps to filter the background radiation from formations.
Specifications:
- Length / Diam: 0.8m / 50mm
- Detector (NaI) : 150mm x 38 mm
- Max. Press. /Temp. 20MPa / 80ºC
- Energy Range 100keV to 2.8MeV
3 Arm Caliper
- Length 1.45
- Diameter 38mm
- Accuracy ±3mm
- Max. Pressure/Temp 20MPa/80ºC
- Range 45 – 600 mm