MWD Standard Directional MWD Service

Transcription

1 MWD Standard Directional MWD Service Provides reliable Directional MWD measurements in hole sizes down to 5-7/8 diameter. (9-1/2-4-3/4 Collar Sizes). Transmits: Hole Inclination, Azimuth, Tool Face & Circulating Temperature (tool also transmits a Quality Assurance status word with each transmission). Tool modes can be programmed from surface. Continuous tool faces in steering mode. Survey transmission time: Average 90 seconds Tool face update rate: Average 30 seconds. Average 9 seconds in fast mode. Power Source: High temperature lithium battery. Operating Parameters Directional Sensor Specifications Maximum Flow rates by Collar Size: Accuracy 9-1/2 OD: 1200 GPM Inclination: +/ OD: 1100 GPM Azimuth: +/-0.5 (inc > 5 ) 6-3/4 OD: 800 GPM Magnetic Tool Face +/ /4 OD: 480 GPM Gravity Tool Face : +/- 0.5 No lower flow limit Temperature: +/- 0.5 C Nominal pressure drop* Repeatability (Dependent on mud weight & flow rate) Inclination: +/ Azimuth: +/-0.5 Maximum sand content: 1% by volume** Maximum operating temperature: 302 F Maximum operating pressure: 15000psi (20000psi available) Maximum drill String RPM: No limit LCM circulation limits: No limit *** Crossover to highside tool face at inclinations > 3.0 * Refer to Target s pressure drop charts ** No uphole filter required *** LCM pills may inhibit tool operations. See LCM Guidelines for full details

2 GAMMA Directional Gamma LWD Service Gamma module is compatible with all Target s MWD systems down to 3-1/8 OD Rapid service upgrade at the wellsite without deploying extra complete downhole assemblies Self contained module with its own power source ensures Directional MWD reliability is not compromised Does not increase the length of the BHA because of sonde configuration. Gamma Sensor Specifications Photomultiplier tube with 4 x 1-1/4 scintillation detector. Service Specifications Gamma update rate: Average 60 seconds. Gamma memory sampling: 16 second samples. Gamma memory life: 1,000 hours. Directional Survey transmission time: As per standard Directional MWD service. Operating Parameters and Physical Specifications As per Directional MWD Service Gamma Battery Cartridge Processor High Voltage Assembly

3 PWR Directional Gamma Resistivity LWD Service PWR tool is compatible with all Target s MWD systems down to 3 1/8 Rapid upgrade at well site Sub mounted with its own power supply PWR Tool specifications PWR tool provides two resistivity curves (Phase and Amplitude Ratio) with different depths of investigation. Depth of investigation varies with the value of Rt being measured: Rt = 20 ohm.m, Phase 69.3, A.R Rt = 1 ohm.m, Phase 39.0, A.R Vertical Resolution varies with value of Rt being measured: Vertical Rt = 20 ohm.m, Phase 2.3m, A.R. 4.8m Vertical Rt = 0.2 ohm.m, Phase 0.26m, A.R Mhz operating frequency. Service Specifications Resistivity update rate: Average 60 seconds. Memory update as requested: seconds. PWR battery life: 500 hours. Directional Survey transmission time: As per standard. Directional MWD service. Advanced data modelling: Dipping bed modelling available to predict the resistivity response in the presence of a dipping formation Both Phase and A.R. Readings can corrected to set depths of investigation for better comparison with wire line tools.

4 PDD Pressure During Drilling Real-time & Memory MWD / LWD Service Available in 3 ⅛, 3 ½, 4 ¾, 6 ¾, 7 ¾ and 8 ¼ OD tool diameters.. Sensor Specifications Measurement Range: psi Accuracy: +/- 0.25% of full scale Repeatability: +/- 3 psi Transmitted Resolution psi / bit Operating Temperature Range: -55 C to 150 C Measurement Type: Detection Method: Bridge Excitation: Corrections: Averaging Time: Update Time Memory: Power Source: Battery Life Keller Piezo Resistive Silicon Sensor Phase sensitive detector / Synchronous demodulator AC 4th order temperature correction of bias and scale factor Adjustable from 1sec - 30sec Adjustable from 1sec - 30sec 2Mb of non-volatile memory High Temperature Lithium Battery 500 hours Service Applications Theoretical ECD modeling Real-time downhole hydraulics monitor Real-time ECD monitoring and management Annulus cuttings overload detection Washout detection Kick monitoring and control Lost circulation detection Mud motor performance and control Mud rheology control Optimization of hole cleaning Formation fracturing / loss limitation Air and underbalanced drilling well control Nitrogen / Air mix control

5 The Target MWD System

6 Short Collar Correction A short-collar correction algorithm (Survey Correction Programme) for solid state magnetic surveys, eliminates the need to run an extensive length of non-magnetic material to obtain a magnetic-non disturbed azimuth, by means of an axial correction. The correction program needs accurate local geomagnetic data obtained from either the British Geological Survey (BGS) model (BGGM) or from locally measured data (IFR). When correcting magnetic surveys the MWD can be run in a standard non-magnetic collar. The Bz magnetometer measuring the axial magnetic component will measure a magnetically interfered azimuth due to the steel below and above the MWD collar. SCC will correct for the axial interference using the local geomagnetic data and the two other magnetometers sensors values (Bx and By). When SCC corrections should NOT be used (NO-SCC zone) Magnetic interference programmes should not be used in high Inclination wells (from +/- 60 degrees inclination), which are drilled in an easterly or westerly direction. The azimuth uncertainties due to the SCC axial correction will become unacceptable. These uncertainties will depend on the tool attitude and hence well path and the sensor calibrations. The cut-off point to use SCC is +/- 1.5 degrees of azimuth uncertainty.