dhi catalog

National Oilwell VarcoDownhole Instrumentation (DHI) Catalog

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Downhole Instrumentation Catalog

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Downhole Instrumentation (DHI)Complementing NOV’s surface solutions is a portfolio of Downhole Instrumentation products for both straight-hole and directional markets. Key advancements in this area include the introduction of NOV’s time saving e-Totco EDR, which serves as an electronic equivalent to the traditional mechanical drift tool that helped to launch Technical Oil Tool Company in 1928.

As a pioneer in downhole electromagnetic (EM) communications for Measurement While Drilling (MWD) tools, NOV serves independent directional drillers with both sales and rental business models via its BlackStar™ EM MWD group. The EM advantage is realized in drilling situations requiring speedy downhole survey data and in situations where aerated or contaminated mud systems make traditional mud pulsed communications problematic.

NOV can offer a partnership and a unique range of services to the industry, especially for high technology environments; electronics packaged to withstand conditions of extreme temperatures, high shock and vibration for specialized markets.

NOV’s DHI group employs highly trained technicians and engineers with experience in oilfield technology instrumentation and aircraft industry environments. It is a dedicated team with individuals totally responsible for their own workmanship and quality on a daily basis.

NOV has manufacturing centers in Europe as well as the US to make service a priority worldwide. NOV also provides product training, calibration of customer equipment, software development, engineering, testing, and product qualification services for its customers.

NOV’s DHI group designs and manufactures steering tools, survey tools (single and multishot), and downhole sensors which provide accurate and reliable information on inclination, azimuth, pressure, temperature, and weight on bit, as well as recently added directional sensors for MWD, Wireline, and Rotary Steerable applications. Such information is critical in directional drilling.

Comprehensive downhole instrumentation service package

• BlackStar EM Measurement While Drilling • BlackStar Dynamic Rotational Gamma • BlackStar Connect • BlackStar Wireline Steering Tool • RSS Calibrated Downhole Data Logger • Directional Digital Measurement Unit • Analog Measurement Unit • Downhole Electrical Generator • Excel Measurement Unit • Coiled Tubing Drilling Weight-On-Bit Sensor • Miniature Steering Tool • Miniature Multishot Tool • Natural Gamma Ray Module • Downhole Pressure Sub • Miniature Utility Steering Tool • Decelerator • Running Gear



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Downhole Instrumentation (DHI)Measurement While Drilling (MWD)National Oilwell Varco is a world leader in downhole tools, services, and technology. Our state-of-the-art BlackStar EM MWD system sets the standard for downhole data acquisition. Combining the latest in EM technology with the most durable and efficient design on the market, BlackStar provides you with a cost effective solution for EM MWD applications.

BlackStar EM MWD Tools MWD applications involve the sending of measurements made by instruments located at the bottom of the hole back to the surface to allow the crew to understand such things as the location and orientation of the drill bit. Traditional MWD systems transmit information to the surface by sending pressure pulses through the drilling fluids or wire transmission.

EM systems send information to the surface through the earth’s crust utilizing low frequency electromagnetic waves. Information is received at a surface antenna, decoded, and then processed by a computer and distributed to the driller’s readout display without the encumbrance of mud or wire

transmission.

Features The BlackStar EM MWD offers many key advantages over more traditional MWD systems. Some of these include:

• Key data points, including: — Magnetic/gravity tool faces.

— Near-bit inclination.

— Azimuth.

— High side gamma.

— Low side gamma.

— Total gamma (directional and 360°).

— Annulus pressure.

— Vibration.

— Downhole revolutions per minute (RPM).

• Variety of fluid conditions, such as: — Aerated mud.

— While pumping lost circulation material.

• Configurable to meet local field conditions.

• Variable data transmission speeds.

• Separate steering and survey frames.

• Compact and battery powered.

• Electronic design eliminates mechanical parts.

• Does not require pump pressure.

• Data output in standard Wellsite Information Transfer Standard format.

• Can be used with a variety of tubular sizes.

Every BlackStar kit is packed and transported in durable and waterproof cases.


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EM systems are the preferred MWD strategy in many applications, including:

• Under-balanced drilling

• Coal Bed Methane (CBM)

• Under-pressured formations

• Lost circulation

• Vertical control drilling

• Directional drilling

• Horizontal drilling

• Re-entry wells

• Contaminated mud systems

Specifications

Length • 30.75 ft. (9.373 meters)

Size • 1.875 ft. OD (0.5715 meters)

Pressure Rating • 20,000 psi (137,895 kPa)

Power Lithium Battery • 80 to 130 operating hours depending on borehole

conditions and transmitter power selection.

• Up to 260 hours of operation for the dual battery option.

Operating Temperature • -20° C (4°F) to +150° C (302° F)

Downhole Data Storage • Up to 144 hours of gamma, annular pressure, total

vibration, and temperature stored at one minute intervals.

Downlinking • Pumps on/off cycling sequence to

change tool’s mode of operation.

Contact Spring

Contact Spring

TransmitterBattery

BatteryCollar

Gap SubAssembly

InstrumentCollar

OrientingPressureSubAssembly

DirectionalAssembly

Gamma RayBattery

Gamma andPressure

Assembly

AnnularPressure Port

Tool GapTransmitter

Battery



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Downhole Instrumentation (DHI)

BlackStar Dynamic Rotational Gamma (DRG)The NOV BlackStar DRG provides the ability to make an accurate measurement of the natural radioactivity emitting from either the high side and the low side of the well bore while drilling. The DRG technology will allow the driller to make more rapid determination of the approaching bed boundary changes and make corrections to adjust his drilling program to stay within the desired zone, thus providing an improved method of geo-steering by adding the ability to record oriented gamma measurements while the drill string is rotating.

The gamma ray detection will graph the hi-side and lo-side gamma to further evaluate well plan formation changes

BlackStarConnectNOV’s BlackStarConnect integrated with RigSense can allow detection of directional drilling operations remotely. Utilize our RigSense EDR system through a WITS connection to add the accessibility of remote operations for your directional tools. Through the satellite feed, you can make up-to-the-second changes on your directional tool parameters. You can access the data with NOV’s WellData Real-Time website. This offers the flexibility to make changes, monitor status, and troubleshoot operations from a remote location.

WellData integrated with BlackStarConnect can monitor the directional tools progress from spud to total depth.

Features • Allow the expertise of a directional driller to

monitor five or more rigs at a time from a remote location to decrease operating costs

• Troubleshoot real-time to the rig with any rig interference data disturbing your directional tools

• Adjust the well plans real-time and no longer have costly rig shutdowns to make corrective actions

• With the use of the BlackStar DRG, stay in a formation for as long as possible to increase rig production

With a WITS feed directional tool, information will now be placed on the RigSense EDR screen to monitor with all other drilling parameters.


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BlackStar Wireline Steering ToolThe BlackStar Wireline Steering Tool is made up of a Directional Digital Measurement Unit (DMU) with a steering module acting as a modem to communicate by electric wireline to the surface system at a data transmission rate of 1200 baud. The system offers many advantages for real-time borehole measurements for a variety of drilling applications including under balanced, short radius, slimhole, and air drilling.

The Steering Tool system is made up of the following: • Downhole steering tool directional probe, with

optional gamma and pressure sensors.

• 1 ¾" OD downhole running gear with centralization.

• Surface wireline power supply and computer.

• Rig floor display unit.

Downhole Gamma ModuleThe addition of a Natural Gamma Module provides directional drillers with timely gamma log information to allow real-time formation correlation and target identification for tighter well placement.

• The Gamma Module will accurately chart shale bed stratification, enabling offset well correlations for better depth control and safer drilling practices within difficult geological environments.

• Gamma logging provides bed correlation in both field appraisal and development drilling to aid with casing point and core point selection.

Downhole Pressure ProbeWhile drilling pressure and vibration measurements provide the necessary information for overall motor/bit/ROP performance improvement, as well as hydraulics optimization for under balanced drilling applications. The addition of wellbore and annulus pressure sensors to the steering tool suite offers significant operational flexibility and efficiency benefits, particularly in wells with potential problems as lost circulation, formation fluid influx, hole collapse, differential sticking and poor hole cleaning (cuttings build up).

• The modular 1¾" sonde instrument couples directly to the Steering Tool assembly (directional + gamma) sensor suite and locks into the Oriented Pressure Sub Assembly.

• Real-time annular and drill pipe pressure measurements.

• Axial and lateral shock/vibration sensors outputting time averaged peak values.

• Choice of further transducer ratings dependent on customer accuracy and pressure requirements are available.

Surface SystemA compact surface wireline power supply and interface provides power to the Wireline Steering Tool and connects to the serial port on an Windows® compatible PC. The PC receives continuous real-time data updates from the downhole instrument via the surface Interface Unit (IFU) and calculates angular data of the borehole. The surface software then provides service functions and transmits data to the RFD unit.



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Downhole Instrumentation (DHI)Russel Sub-Surface Systems (RSS) Calibrated Downhole Data LoggerThe Russell Sub-Surface Calibrated Data Logger represents a new sensor development to record downhole drill string vibration events as determined by a user pre-set minimum threshold. Housed in a 92.8 mm (3.652”) x 19.05 mm (0.75”) diameter cylindrical cartridge, the battery powered Data Logger can be configured and downloaded in the field by way of a mini USB interface to a PC USB port. Downloaded memory files can be processed for graphic display and integrated with other data sets via Excel in a .csv format. Both axial and lateral accelerations are measured with output calibrated in G’s, together with temperature against time and can be graphically displayed on downloading.

Above is an example of recorded 2-axis vibration and temperature data versus time. The software has a capability to enable the user to zoom in for closer interrogation at any point on the time line, as per the example above.

Applications and Benefits • Monitor drill string vibration activity and

temperature over time for equipment tracking. • Vital information for post-run string

component failure analysis. • From 4 seconds to 66 minutes sampling interval option. • Calibrated accelerometer output in G RMS for

both axial and lateral measurements. • Vibration threshold (G RMS) and sampling intervals are

selectable by user in the field or maintenance shop. • Easy to use surface interface kit and

software for data evaluation. • Nickel alloy construction cartridge for improved wear. • Can be customized further for specific

monitoring applications. • Replaceable battery for easy serviceability. • High temperature operation at 150º C (302° F).

A graph is produced from a .csv file for easy viewing of the axial/lateral vibration.


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Directional Digital Measurement Unit (DMU)The Directional Digital Measurement Unit (DMU) has been designed to provide low-cost, high-accuracy survey measurements under extreme shock and vibration.

The module incorporates highly reliable sensor technology which has been custom-designed for borehole applications and provides a small diameter (1.04”) measurement while drilling package for original equipment manufacturer (OEM) applications. The DMU is designed to nominally provide measurement accuracies of 0.1° inclination and 1.0° azimuth and is typically used in borehole

measurement instruments for directional drilling and surveying applications within the oil and gas industry.

The DMU is a multi-purpose directional module enabling a flexible approach to custom applications which incorporates a tri-axial accelerometer set and three fluxgate magnetometers to provide an all-angle measurement capability. The unit includes integral

analog to digital conversion and processing electronics supplying calibrated data streams for each sensor, removing the need for separate calibration in users’ target systems. The communications bus enables a “Plug and Play” capability for a suite of add-on RSS sensor modules or customer systems.

Benefits • Modular design offers ultimate flexibility.

• Minimum length of 18 inches and instrument O.D. of 1.04 inches suits slimhole and short radius work.

• Customizable for standard mounting arrangement.

• High reliability and reduced operating costs.

• Small size for slimhole and short radius applications.

• High temperature capability (no need for thermal flasks in most applications).

• Superior accuracy due to sensor performance and the minimization of thermal errors using a digital sensor module.

• Standard serial peripheral interface provides multi-sensor option that can be used for verification and/or sensor redundancy purposes.

*OptionsThe DMU can be offered with a choice of accelerometer sets: Quartz hinge for high accuracy, industry standard MWD sensors Trax for robust tool-face output in high vibration applications (underbalanced, coil tubing, and hard rock drilling) Silicon for low temperature steering and multishot survey duty



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Downhole Instrumentation (DHI)Analog Measurement Unit (AMUQ)The RSS Analog Measurement Unit (AMUQ) has been designed to provide high accuracy directional measurements under extremes of temperature, shock, and vibration. The module combines a tri-axial Honeywell Q-Flex® and fluxgate set, which are custom designed to provide a small diameter, high accuracy flexible measurement package for OEM applications.

The unit is designed to provide measurement span accuracies of 0.1° inclination and 0.75° azimuth over the full temperature range and is typically used in borehole measurement instruments for directional drilling and surveying applications within the oil & gas industry. The directional measurement unit consists of 3 quartz flex accelerometers and three magnetometers to provide tri-axial all angle measurement capability. The AMUQ is supplied with an analog output and provides raw (uncalibrated) sensor output voltages proportional to the strength of either the gravitational or magnetic field experienced by the respective receptor. A separate calibration data set is then provided to customers for incorporation in their target system.

Analog Measurement Unit (AMUT)The RSS Analog Measurement Unit has been designed to provide low cost, high accuracy directional measurements under extremes of temperature, shock and vibration. The module combines the RSS TRAX tri-axial accelerometer fluxgate set which is custom designed to provide a small diameter, high accuracy, flexible measurement package for OEM applications. It is designed to nominally provide measurement accuracies of ±0.1° inclination and ±1.0° azimuth, and is typically used in borehole measurement instruments for directional drilling and surveying applications within the utility and oil and gas industries. The DMU consists of a three axis RSS accelerometer (TRAX) and three magnetometers to provide tri-axial all angle measurement capability. The AMUT provides uncalibrated sensor output voltages proportional to the strength of either the gravitational or magnetic fields experienced by the respective sensor. A separate calibration data set is then provided to customers for incorporation into their target system.

Downhole Electrical GeneratorThe RSS Downhole Electrical Generator provides regulated power and is ideal for the replacement of lithium battery systems and flow switches. A 10-way through conductor mechanical interface connection may be customized to suit customer requirements. Flow associated wear parts are field replaceable and serviceable.

unit is designed to provide measurement span accuracies of 0.1° inclination and 0.75°uth over the full temperature range and is typically used in borehole measurement uments for directional drilling and surveying applications within the oil & gas industry. The tional measurement unit consists of 3 quartz flex accelerometers and three magnetometersovide tri-axial all angle measurement capability. The AMUQ is supplied with an analog ut and provides raw (uncalibrated) sensor output voltages proportional to the strength her the gravitational or magnetic field experienced by the respective receptor. A separate ration data set is then provided to customers for incorporation in their target system.

log Measurement Unit (AMUT)

Applications and Benefits • Low cost maintenance • Field replaceable flow parts • Wear and flow parts are configurable in the field • 50 watts of regulated DC power at 2000

RPM (higher power options available) • Impellers can be designed to meet

customer specific requirements • 1 7/8" Pressure housing • A range of collar IDs can be accommodated • Overall length approximately 41" • High Temperature capability • Electrical connectors specified by the customer • Retrievable option available

The package is made up of the following elements: • External pressure capability (20,000 psi)

• Connectors (as required by customer)

• Electrical generator assembly

• Thrust and radial bearings

• Run time logging

• Flow tube installation for high flow rates


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Excel Measurement UnitNOV’s Excel Measurement Unit represents the next generation of subsurface directional oilfield measurement while drilling (MWD) surveying sensors, offering a cost effective modular alternative to the industry standard. The tool can be configured with a choice of either a TRAX (TT150) or quartz hinge (TQ150) accelerometer package to fit both 1.5” or 1.875” pressure housings and comes with a separate interface box to allow tool set up and surface testing communications via laptop computer. The tool is made up of a controller and directional sensor, using standard multi-pin connectors to enable the sensor package to fit customer specific snubber and sensor end assemblies and has the ability to be pre-configured with selectable data strings in conjunction with existing surface equipment. Suitable interfacing with computers and quality assurance data configuration checking facilitate this capability.

The Excel Measurement Unit has been specifically engineered to be a direct replacement for other manufacturers’ directional modules within their own MWD system.

Benefits • Low cost • Choice of accelerometer packages dependent on applications — TRAX or Quartz hinge • Easy to integrate and use with existing mud pulse system assets — both downhole

and surface; connectors can be modified for customer specific needs • Built-in system level checking features and trouble shooting • Tool set up and testing communications via interface box and laptop • Sensor package only or with pressure housing/bulkheads options • Gamma ray facility allows for the processing of natural gamma data

Coiled Tubing Drilling (CTD) Downhole Pressure and Weight-On-Bit SensorThe NOV CTD downhole pressure and weight on bit sensor complements the NOV steering tool capability.

In addition to accurate bore and annulus pressure, knowledge of this instrument gives a valuable insight into coiled tubing drilling operations. In highly deviated and horizontal wells, indications of load at surface will not be an accurate indication of what is actually happening downhole, particularly in the event of poor weight transfer.

With the CTD downhole pressure and weight on bit sensor, monitoring of forces experienced downhole can be assessed in real-time. This information, when used in conjunction with the NOV pressure module data, provides the necessary parameters required to optimize drilling efficiency.

This instrument is a real-time weight on bit gauge for measuring downhole loads during drilling operations that interfaces directly to the NOV wireline steering (directional and gamma) Tool sensor suite. The CTD downhole pressure and weight on bit sensor also incorporates vibration sensors.

Features • Modular subsurface instrument which couples directly to the steering tool (directional and gamma) sensor suite.

• Real-time weight on bit annular and drill pipe pressure measurements.

• Axial and lateral shock/vibration sensors.

• Temperature sensor.

• Torque on bit also available.

Real-time measurements • Tension and compression loads (fully compensated for drill bit pressure drop).

• High accuracy bore and annulus pressures.

• Bottom Hole Assembly (BHA) shock and vibration.

eatures



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Downhole Instrumentation (DHI)Miniature Steering Tool (RST)The NOV RSS Miniature Steering Tool can be run on standard electrical wireline. It is made up of a Directional digital Measurement Unit (DMU) with a steering module acting as a modem link by wireline to surface. Overall tool length is 24 inches, with a data transmission rate of 1200 baud. The RST system offers many advantages for real-time borehole measurements for a variety of drilling applications including under balanced, short radius and slimhole drilling.

Downhole steering tool probeThe directional sensor consists of an RSS fluxgate set and a choice of tri-axial Honeywell Q-Flex® or TRAX accelerometers. These sensors enable the azimuth and inclination of the borehole to be accurately measured. The signals from these sensors are sent via the steering module by way of an insulated wireline cable to the surface computer. The steering tool is fitted into a single pressure housing of either 13/8" or 1¾" OD.

Surface systemA compact surface wireline power supply and interface provides power to the RST and connects to the serial port on the computer. The computer receives continuous real-time data updates from the downhole instrument via the surface interface unit and calculates angular data of the borehole. The surface software then provides service functions and transmits data to the rig floor display unit. A hard copy of the data is also available.

Applications and benefits • High reliability and reduced operating costs through the use of RSS sensor technology • Survey data while drilling, eliminating the need to stop circulation • Small size eliminates the need for instrument articulation • High temperature option • Superior accuracy due to sensor performance and calibration • Easy use of Microsoft® Windows-based steering and well guidance software • Built-in checking features and system trouble shooting • Versatility of use in oilfield, mining, and utility applications • Fully configurable to customer requirements • Magnetic interference correction software available.

Miniature Multishot Tool (MMT)The Advanced Miniature Multishot Tool (MMT) represents the current generation of open hole/drill pipe survey instruments with an OD of 1.04 inches. The MMT provides definitive survey information, corrected for magnetic interference, and can be run at any time during the drilling process or prior to making a bit trip, in time to make any directional course corrections.

Applications and benefitsThe MMT provides a sophisticated multishot service package offering a number of advantages, including:

• High reliability through the use of industry standard tri-axial accelerometers • Small size for slimhole and short radius applications • High temperature capability of up to 5 1/2 hours at 315°C in heat shield (eliminating

the need for high cost thermal flasks in most applications) • Superior accuracy due to sensor performance and the minimization of thermal errors due to the use of a digital sensor module • Standard interface providing multi-sensor options can be used for verification and/or sensor redundancy purposes • Reduced operating costs due to lower power consumption and R&M cycles • High capacity data storage (5000 shots) providing increased data resolution and extended downhole time • Both multishot and single shot running options • 32-bit surface processing software with magnetic interference routines • Custom designed mechanical/hydraulic decelerator available for ‘Go Devil’ work • Double battery stack allows for 60 hours (Alkaline)/90 hours (Lithium) operation (based on one survey shot per minute)

Natural Gamma Ray Module (NGM)


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The RSS Natural Gamma Ray Module (NGM) has been developed to complement its highly successful range of slimhole directional measurement instruments. The probe has the same OD as the directional probe (DMU) and can be placed either above or below the DMU within a standard non-magnetic collar.

The addition of an NGM probe provides directional drillers with readily available formation correlation and target identification information for tighter control, allowing earlier corrections to be made.

Applications and benefits

The NGM tool is the industry standard and can form the basis of any downhole directional plus gamma package.

The NGM offers a wide number of benefits over the conventional gamma, including:

• Low cost add-on module with high temperature capability

• Provides real-time logging-while-drilling in combination with steering data

• Standard interface providing multi-sensor options

• The NGM will accurately chart shale bed stratification enabling offset well correlations for better depth control and safer drilling practices within difficult geological environments

• Its small size enables the NGM to be run in collars as small as 2.5 inches, providing enhanced bed boundary marking in many slimhole applications

• Provides bed correlation in field appraisal and development drilling for casing point and core point selection

• Focused gamma ray options available for customer specific applications

• Tool utilizes a scintillation detector, enabling faster sampling capability and data updates

Downhole Pressure SubThe RSS sonde mounted modular Downhole Pressure Sub complements the NOV steering tool capability.

Pressure and vibration measurements while drilling provide the necessary information for overall motor/bit/rate of penetration performance monitoring as well as overall hydraulics optimization for underbalanced drilling applications. The addition of wellbore and annulus pressure sensors to the steering tool suite offers significant operational flexibility and efficiency benefits, particularly in wells with potential problems as lost circulation, formation fluid influx, hole collapse, differential sticking, and poor hole cleaning (cuttings build up).

Features • Modular 1¾ inch sonde instrument which couples directly to the Steering Tool assembly (directional + gamma) sensor suite

• Real-time annular and drill pipe pressure measurements

• Axial and lateral shock/vibration sensors out putting time averaged peak values

• Choice of further transducer ratings dependent on customer accuracy and pressure requirements are available

• Temperature sensor



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Downhole Instrumentation (DHI)Miniature Utility Steering Tool (MUST)RSS Miniature Utility Steering Tool represents a Wireline Steering Tool for the utility industry. It is made up of a Directional digital Measurement Unit (DMU) with a steering module acting as a modem link by wireline to surface. Overall tool length is 24 inches with a data transmission rate of 1200 baud. The MUST system offers many advantages for real-time borehole measurements for a variety of drilling applications including under balanced, short radius, and slimhole drilling.

Downhole Steering Tool ProbeThe Directional Sensor is composed of either an RSS TRAX tri-axial or q-flex accelerometer and fluxgate set. These sensors enable the azimuth and inclination of the borehole to be accurately measured. The measurements from these sensors are sent via the Steering Module by way of an insulated wireline power cable to the surface computer. The Steering Tool is fitted into a single

pressure housing of either 13/8 inches or 1¾ inches OD.

Applications and benefits • High reliability and reduced operating costs

through the use of RSS sensor technology • Survey data while drilling, eliminating

the need to stop circulation • Small size eliminates the need for instrument articulation • Superior accuracy due to sensor

performance and calibration

• Easy use of PC Windows-based steering and well guidance software

• Built-in Quality checking features and system trouble shooting

• Versatility of use in both mining and utility applications • Fully configurable to customer requirements • Magnetic interference correction software available • Programmable inclination crossover from

magnetic to gravity tool face

DeceleratorNOV’s Decelerator is designed to limit the impact shocks applied to sonde based instrumentation tools which house sensitive electronics and sensors. The device utilizes a linear hydraulic braking mechanism to arrest the terminal velocity motion of the instrument bearing assembly in a controlled manner.

The decelerator is available in 1¾" and 1 3/8" diameter options.

Running GearNOV offers a substantial range of downhole tool running gear and spares in various sizes to suit your requirements,

e.g., 1.375, 1.5, 1.75".

• Upper centralizers

• Lower centralizers

• Landing shock absorbers

• Spacer bars – aluminum

• Spacer bars – brass

• Contact sub assemblies

• Pressure barrels (beryllium copper)

• Contact springs

• Muleshoe stingers

• Swivels

• Overshots

• Rope sockets with fishneck

• Top/bottom finger guides

• Bulkheads

• Bottom plugs with shock absorbers

• Decelerators

• High temperature heat shields


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e-Totco® Electronic Drift & Temperature RecorderThe e-Totco electronic drift survey tool improves accuracy and offers enhanced reliability and “user friendliness.” NOV now offers a Multishot Reader and e-Totco (150°C) tool with significant technological advantages over single shot tools to reduce overall surveying time and costs in drilling vertical boreholes.

Compatible with all industry standard pressure barrelsThe e-Totco tool is a “drop-in” replacement for all vertical mechanical Controlled Vertical Drift (CVD) instruments. The compact, robust electronic package is designed to be used with the rig’s existing running gear, including the standard NOV pressure barrel (Go Devil), or in many other pressure barrels owned by drilling contractors around the world.

Survey on Demand Push a button and the display will lead you through the survey procedure. No more waiting for a preset clock to take survey, eliminating the timing guess work associated with running mechanical surveys means a more efficient, cost effective, and reliable way of optimizing CVD measurements.

Multishot capability allows you to select up to 64 surveys per run by just pushing a button when the Go-Devil reaches desired depth. In addition, it provides a manual depth entry option, which allows correlation of survey measurement and well temperature with corresponding depth on the printed survey ticket.

Better resolution than mechanical surveys The e-Totco instrument has an electronic sensing system that produces 0.05% repeatability of survey records and 1% reading accuracy [±0.1°].

• Greater Range - Up to 20 degrees.

• One e-Totco instrument provides all mechanical CVD instrument ranges: (1-1/2°, 3°, 7°, 8°, 14°, 16°, and 20°).

Records Downhole Temperature The e-Totco records the wellbore temperature at the survey depth and can be extrapolated to total depth.

• Operating temperature: 10° to 150° C (50° to 302°F).

• Survival temperature: -20° to 165°C ( -4° to 329°F).

e-Totco Multishot Reader The e-Totco Multishot Reader data terminal operates on rechargeable NiCad batteries and features an LCD status readout, a thermal printer, and three buttons that control the sequence of a survey and allows depth entry.

RigSense® 2.2 Compatible No more printing necessary; you can store and access all survey records. The integration with RigSense 2.2 removes the necessity to manually fill out reports, saving you more time.

National Oilwell Varco has produced this brochure for general information only, and it is not intended for design purposes. Although every effort has been made to maintain the accuracy and reliability of its contents, National Oilwell Varco in no way assumes responsibility for liability for any loss, damage or injury resulting from the use of information and data herein. All applications for the material described are at the user’s risk and are the user’s responsibility.All brands listed are trademarks of National Oilwell Varco.

One Company . . . Unlimited Solutions

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