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Brand: M/D Totco
E-Totco Electronic Drift Survey Tool
Description
An electronic drift indicator for vertical hole surveys
The E-Totco electronic drift survey tool is an electronic instrument for vertical drift surveys that displays and prints the survey result together with its accuracy. NOV states that it is a drop-in replacement for all vertical mechanical controlled vertical drilling (CVD) instruments and is designed for use with the standard NOV pressure barrel, known as a Go-Devil. It forms part of the M/D Totco family of data acquisition and information management products.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / brand | NOV, M/D Totco E-Totco electronic drift survey tool |
| Application | Vertical drift surveys; replaces vertical mechanical CVD instruments |
| Run configuration | Standard NOV pressure barrel (Go-Devil) |
| Multishot | Up to 64 surveys per run; multishot surveys while tripping out of hole |
| Maximum temperature | Up to 302 F (150 C) |
| Repeatability | 0.05% of survey records |
| Reading accuracy | 1% (plus or minus 0.1 degree) |
| Quality assurance | Calculates precise inclination accuracy and displays and prints the actual survey accuracy |
| Temperature reporting | Well temperature recorded with each survey |
| Data integration | RigSense compatibility; survey records stored and accessible without manual report filling |
What the tool changes on the rig
With survey on demand the driller no longer guesses the survey time, which reduces the risk of a missed or moving survey. The multishot capability allows the tool to be dropped at total depth so that surveys are taken while tripping out, which NOV links to avoiding nonproductive time caused by stuck pipe. The recorded well temperature lets the driller correlate temperature with each survey, and the printed accuracy figure removes uncertainty over survey quality.
Confirm the barrel size and thread, the hole temperature and depth, the printer and data interface and the RigSense version used on the rig before ordering. The flyer carries no ordering codes or dimensions.
Related M/D Totco products: M/D Totco TRU-VUE GM14 Unitized Pressure Gauge, M/D Totco Anchor Type Hydraulic Weight Indicators, M/D Totco GM6A / GM6AP Single Pointer Hydraulic Indicators, M/D Totco DBS107A / DBS112A Pressure Debooster Systems, M/D Totco GM4 / GM4P Compound Pointer Hydraulic Indicators and M/D Totco H6E Tong Line Pull Indicator and Load Cell.
Documents and quotation
The NOV E-Totco flyer is available on this page. See Portable Test & Measurement for other portable instruments. Seven Star LLC quotes against the confirmed configuration.
Datasheets & Documents
- Brochure E-Totco Electronic Drift Survey Tool flyer (NOV) Download
Reviews (0)
About brand
M/D Totco is a brand of drilling instrumentation and rig data systems owned by NOV. It combines two businesses from the 1920s: Martin-Decker, formed in 1928 when Elmer Decker and Frosty Martin bought out the Loomis Oilwell Control Company, and Totco, the Technical Oil Tool Corporation, founded in 1929 to make a mechanical drift recorder. Varco acquired both in 1990 and formed M/D Totco.
Seven Star LLC is an independent supplier in Muscat. We list M/D Totco instruments for drilling contractors and rig maintenance in Oman and the GCC.
M/D Totco company profile
| Origins | Martin-Decker (1928) and Totco (1929), USA |
|---|---|
| Formed as M/D Totco | 1990, under Varco |
| Ownership | NOV Inc. |
| Industry term | A totco is a common name for a mechanical drift recorder |
| Product families | Weight indicators and deadline anchors, mud pressure gauges, pump stroke counters, pit volume totalizers, Totco drift recorders, driller's displays, RigSense wellsite information systems |
Milestones
- 1928: Martin-Decker is formed.
- 1929: Totco is founded.
- 1990: Varco combines the two as M/D Totco.
- 1999: The RigSense wellsite information system is introduced.
M/D Totco product series
Weight instruments include the anchor type hydraulic weight indicators, the GM6A and GM6AP single pointer indicators and the GM4 and GM4P compound pointer indicators. The H6E is a tong line pull indicator with load cell.
Pressure products include the TRU-VUE GM14 unitized pressure gauge and the DBS107A and DBS112A pressure debooster systems, and the E-Totco is an electronic drift survey tool.
Hydraulic weight indicators read the dead line tension through a load sensor at the anchor and show hookload on a large dial in front of the driller. Debooster systems isolate gauges from drilling mud while passing the pressure signal.
Where M/D Totco instruments are used
Hookload and weight-on-bit reading, mud pump and standpipe pressure, tong torque and wellbore inclination surveys on drilling and workover rigs.
M/D Totco products we list
Ordering M/D Totco instruments: what we need
Send the model or part number, the dead line anchor or sensor type, range and dial, and the hose and fitting needs.
Facts checked against NOV's M/D Totco brand history, October 2026.
Browse M/D Totco products by category: Pressure Instrumentation.
Related products
Frequently Asked Questions
What does the E-Totco measure?
Vertical drift inclination in drilling, replacing vertical mechanical CVD drift instruments.
How many surveys can one run take?
Up to 64 surveys per run, including multishot surveys while tripping out of hole.
What accuracy is stated?
1% reading accuracy (plus or minus 0.1 degree) and 0.05% repeatability of survey records.
What temperature can it handle?
The flyer states depth capability at temperatures up to 302 F (150 C).
What does it run in?
The standard NOV pressure barrel, known as a Go-Devil.
Reviews
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