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Items (48)

  • What are the 12 measurements provided by EcoScope?

    Neutron PorositySigma (RT only)Multi-depth Sigma (not commercial)SpectroscopySourceless Neutron Gamma Ray (NeoScope)Azimuthal Density &_ PEFAzimuthal Natural G.R.ResistivityUltrasonic &_ Density CalipersAPWD &_ Annular tempNear-bit INC.Tri-axis shocks

  • What are the specifications for EcoScope?

    tool size - 6.75"length - 16'Hole size - 8 3/8 to 9 7/8max dogleg - 8 rotate, 16 sliding per 100'max flow - 800GPMmax temp - 150¤Cmax pressure - 20,000 psistab sizes - 7 7/8, 8 1/4, 9 3/8"power - from PUP (ONLY! PP doesnt have enough juice!) 55w, 1.7A, 29v

  • Can EcoScope be run with Stethoscope?

    Yes, but they need to be on opposite sides of PUP

  • What are the stab sizes for EcoScope?

    7 7/8, 8 1/4, 9 3/8"

  • When building frames for EcoScope, what is of primary concern?

    The DHS version for the tool.

  • What are the new design features of EcoScope?

    Single collarReduced Inter-tool connectionsLatest electronics - modularBoards reduced to 17 from 22 (ARC)Tool self-DiagnosticsSimplified single source loadingOrion3 data compressionCl on antenna shields (split-key on ARC)Slide-on Stabilizer

  • What is the current DHS for Ecoscope?

    Noemi 5.3

  • Explain how the EcoScope makes the natural_Gamma Ray measurement.

    A NaI scintillation detector measures the_Natural Gamma Rays (NGR), however on this tool_the crystal is bigger than on other tools and_the stabilization is achieved in a very_different manner.

  • Define G.R. gain regulation:

    Regulation is based on backscatter peak, from_160-175 KeV based on windows 1 and 2 counts_comparison (weighted ratio around the peak)

  • what is the high energy threshold, and how_does the Ecoscope handle it?

    H.E. Threshold is around 3.5MeV (cut off_level,) and any GR detected above this is_considered coming from O2 activation, and is_removed from total counts.

  • What are the 3 Natural GR measurement environmental corrections? (Ecoscope)

    Bit size, MudWeight, K%

  • Explain how Azimuthal focusing is achieved for_the GR measurement:

    A tungsten back shielding is used to absorb GR_coming from the back of the tool. Tungsten is_high density material (19.25 g/cc). So Gamma_Rays cannot pass through the back. The Collar_is also thinner, has better shielding and the_crystal is bigger, which leads to improved_measurement statistics and better Azimuthal_focusing.

  • Describe the GR measurement formula and how it is corrected for_Oxygen activation:_

    Net count rate = Uncorrected count rate - O1 *_N4when: N4 - CPS above threshold TH4 (3.5 MeV)_and O1 - Correction factor (from experiments)

  • Where does the O2 correction take place?

    Done automatically in tool (since Lagerfield)Karl2 DHS required additional dpoint TCOA to_make correction @ surface.

  • How many GR sectors does EcoScope provide?

    16 in RT &_ RM (since Karl)

  • Are GR quadrants available?

    Yes, in RT, interpolated to produce a 56_sector image.

  • How do we calculate GR_API

    GR_API=CPS * 1.8For RAB=CPS * 4.8

  • Explain the Natural GR computation flowchart for_Ecoscope: (convert cps to API)

    Raw counts -&gt_ O2 correction -&gt_ K correction -&gt__Borehole &_ M.W. correction -&gt_ CPS to APIROK-B M.W. =CPS TO API

  • Does Ecoscope require a second calibration?

    No. Blanket is only used to verify tool_operation.

  • Describe / draw a diagram of the Ecoscope tool

    T1, T3, T5 BELOW receivers, T2, T4 above._Shield directly above R2. T2 spacing @ 24"<img src="eco02.PNG" />

  • Why is T2 spaced at 24"?

    Due to Neutron shielding on SSn (Short-spacing_Neutron detector.

  • If backreaming is required but neutron_measurements are not what is your response?

    Perform downlink

  • Explain the term “mixed borehole compensation”_and how it is affected by a failed transmitter

    BHC resistivities are computed from the raw_channels using this matrix:RES XX= a x Res12 + b x Res22 +c x Res32 + d x_Res42 + e x Res52When a transmitter fails, the BHX matrix can_be adjusted to compensate for the loss with_the remaining channels if needed. The_coefficient for the transmitter is set to 0_and the others adjusted. In RM this has to be_done manually, in RT the EcoScope DHS will_automatically switch to the different_transform_

  • What is the Ecoscope resistivity record rate?

    2 seconds (default) can be changed to 4 sec.

  • What are some other differences between_Ecosope and ARC?

    EcoScope will monitor all transmitters_currents and modes, and will switch it off if_it sees something strange, and will correct_failed transmitters automatically.Automatic tuning- This is a diagnostic check_that the tool performs to check if the tool is_operating correctly at the relevant frequency,_it results in less noisy logs.physically, the resistivity antenna are reversed, and is spaced at 22" because of the shield.

  • Describe the Ecoscope resistivity flags.

    QC flags always have a Hardware and a_Measurement side to them.If one of them is_outside of the “green” area the flag is_triggered.GREEN - RESSTAT=0,_YELLOW - HARDWARE ERRORRED - BOARD ERROR OR MEMORY FULLWHITE - NO MEASUREMENT TICKS FOR MORE THAN 2'

  • What type of GR detector does Ecoscope use?

    A Spectral NaI Scintillation detectors (similar to ADN.)

  • Draw a graph and insert the correct labels for GR interactions

    Our sources emits GR energy of around 662 KeV.

  • What window (W1-W4) has the largest photoelectric effect? and what information is contained in it?


  • What does the Spine and Rib chart do?

    Compares the density measured using the short and long spacing detectors as shown.

  • What is the N.B. inc formula?


  • As standoff increases in light mud what_happens to the GR measurement?

    the density measured in the short spacing_detector will decrease more rapidly than the_long spacing as it has a shallower depth of_investigation_

  • How is the shape of a "rib" designed?

    The shape of the rib is characterized during_tool design so it is possible to determine the_density correction (delta p)

  • What would be an indication of excessive_standoff? And how should we handle it?

    large delta p values (>.2g/cc)coresponding density data values should be_disregarded

  • What is the Ecoscope density RT range?

    0.9-3.44 g/cc

  • What does the Ecoscope tool do when the_measurement is outside it's range?

    send default value of 3.44 g/cc (even if it's_below the lower threshold value of 0.9 g/cc

  • Where can we find the Ecoscope QC flag_descriptions?

    In Ecoscope LQCRM

  • List the Drilling Dynamics measurements available:

    shocks: lat,ax,tor, NB INC, APWD, US caliper

  • How many accelerometers does ecoscope have, and what is their function?

    4 accelerometers, to measure the three types of shocks: Lateral, Axial, Torsional.

  • Describe how the near bit inclination measurement is done in EcoScope, and what is it's accuracy?

    Single axis accel., mounted @ slight angle and also slightly off center. rpm correction req'd Above 45deg inclination, accuracy is ~0.1deg

  • How is the Near-bit INC. accelerometer calibrated?

    Calibration includes 4 horizontal measurements to correct for centrifugal force, and for sensor misalignment (sliding)Calibration has also _up-down gain/offset corrections.

  • Describe Static and Dynamic Pressure

    Dynamic pressure=with pumps on and MWD powerStatic pressure=with pumps off and no MWD power (RTC battery power instead)

  • Describe the APWD function in Ecoscope

    Sensor re-calibration every 2 yearspowered by RTC when MWD off.Static &_ Dynamic pressures recorded into memoryup to 24 hrs LOTStatic temp available in RT &_ RM (since Martina)_

  • List the Ecoscope drilling dynamics measurements

    4 accelerometers to measure the three types of shocks, one inclinomiter for Near Bit inclication, an APWD sensor for LOT and dynamic pressure and up to two ultrasonic calipers for caliper measurements while rotating (at least one sensor present) and while sliding (2 Ultrasonic sensors required).

  • Can static APWD data be merged with circulating data?_

    Static measurement data can be merged with circulating data via ToolScope software see Intouch 5667074: ESD Recompute for EcoScope in MaxWell.

  • Describe the Ecoscope MVC, and what shock dpoints are we using?_

    One triaxial Accel.One single axis, 180o, vibX, viblat, vibrot

  • Describe the Ultrasonic caliper, and what is it's function?

    US H.D. when sliding and rotating can be provided. The caliper measurement is made by firing the two sensors simultaneously. as a result,._Ultrasonic sensors mounted on enlarged section of collar, although not on the stabilizer, less standoff. The reason they could not be placed on the stabilizer is due to space limitations.

  • What are the_Ultrasonic Caliper-Measurements?

    Avg BH d.16-sector average caliper(rot)_Vert. d.(rot)_Horizontal d.(rot) Tool eccentricity (rot) Similar measurements to ADN except we can get Caliper while sliding and also 16 sector images instead of 8, whilst rotating.