The Delta Epsilon family of portable borehole loggers offers a unique combination of versatility, compactness, ruggedness of design and ease of operation.

The Delta Epsilon Loggers are easily transported, set up, and operated by one person to efficiently acquire borehole data.

With an unsurpassed combination of features, the Delta Epsilon Loggers represent a superior engineering concept and are the world's finest portable borehole logging systems.



  • A choice of two acquisition Systems: (1) A weatherproof integrated system featuring a ruggedized computer and well log plotter, or (2) a probe to PC interface utilizing standard or ruggedized PC notebook/laptop computers.
  • A self-explanatory, menu driven system serves as the operator interface for both acquisition systems, facilitates automatic data storage and display, and has optional real time hard copy plotting in the field. The system utilizing external notebook or laptop computers uses a Windows 95 based operating system.
  • A multiple function digital probe system that economically provides a comprehensive logging capability. Data are converted to digital form in the probe and transmitted digitally to the surface.
  • A choice of four winch systems that includes two portable hand cranked or motor driven 300 meter systems, a portable motor driven 600 meter system, and a semi-portable motor driven 1000 meter system.
  • All winches and instrument assemblies are internally shock mounted in protective permanent shipping and storage cases.
  • All systems are completely battery powered and do not require external motor driven generators or inverters and have world wide power compatibility



Click to download full-size pic (26kb)

Typical field setup

The user has a choice of two computer based surface acquisition systems which serve as the operator interface, control the probes, and acquire, display, and store the log data. All Delta Epsilon probes are compatible with either system, and either system may be used with any of the Delta Epsilon winches. Each system is supplied with Delta Epsilon LOGWELL software for a log header, log recording, real time display and plotting of logs, or for log playback. Logs are plotted or displayed in either a split or API style grid and digitally stored in LAS 2.0 standard format. Additional processing, editing analysis and formatting can be done with VIEWLOG or WELLCAD, both of which are available from Delta Epsilon. Operating commands are simple and easy to understand. Initialization files are saved to simplify insertion of header information for repeated operations at one site.


Click to download full-size pic (31kb)Because you cannot always choose your working environment, the Delta Epsilon 1000 AM acquisition system is prepared to work reliably under the toughest conditions. The entire instrument assembly has been designed to resist intrusion from moisture or dust and is internally shock mounted. The integral PC computer has a wide temperature operating range, is water and dust tight and can withstand a four foot drop onto concrete. It also features an industry standard PCMCIA 2.0 memory card rather than an inherently fragile floppy disk for data storage. A 1 MB memory card can store conservatively 1 0~000 feet of borehole data assuming four logs and a .5, digitization interval. This allows both application software and data to be kept in a secure, rugged memory medium.

There are instances for making decisions at the well-site where there is no substitute for having a hardcopy log in the field. Data displayed on most computer screens is difficult or impossible to see in direct sunlight, and typically only a limited portion of the entire log is observable at once. The 1000 AM features an integral 4.5" wide thermal well log plotter. Carefully chosen for rugged field use, the plotter is housed behind a water and dust tight door and features efficient power management, a wide temperature operating range, graphics capabilities specific to logging and a chart take-up which prevents the log from flapping in the wind or spooling off into the mud. After acquiring a log at the borehole, the log may be re-played to the plotter with different spans, scales, and offsets. This allows production of a final, high quality log before leaving the well site.

The 1000 AM is completely battery powered. It and the plotter will operate for a minimum of eight hours from its internal battery pack. This is more than twice as long as a typical notebook or laptop computer without any hardcopy function. When used with the 300-1 hand cranked winch, no external power source is required. A convenient "gas gauge" display clearly informs the operator of battery status. The 1000AM may be recharged or operated from an external 12 VDC, 90 - 240 VAC 50-60 Hz. source. Full battery charge from its internal charger is accomplished in less than three hours.


Click to load full-size pic (33kb)EPCI-9511: POWER, ECONOMY AND VERSATILITY OF THE PC

The EPCI-9511 digital acquisition system is a micro-controller based PC interface that supports all Delta Epsilon digital probes and allows them to utilize the power and economy of an external notebook or laptop PC to record and display borehole data and to provide interactive log processing power on site. Because of its small size, the EPCI-9511 is easily integrated with any of the Delta Epsilon winches.

For applications where the environmental suitability of a standard notebook or laptop computer is adequate and a hardcopy in the field is not a consistent necessity, the EPCI-9511 acquisition system offers several advantages. The larger keyboard, screen and Windows 95 based operating system will be familiar to many.

The user has the choice of an ever burgeoning array of increasingly powerful and economical notebook and laptop computers, including several recently introduced ruggedized versions. As opposed to standard laptop/notebook computers that are designed for an office environment, ruggedized versions are shock resistant, watertight, and some have displays that have improved visibility in sunlight. These are very appropriate and highly recommended for field use. These can easily be upgraded or replaced as technology evolves. In many instances, sales and service are available world wide. Environmental conditions permitting, optional real time plotting in the field can be done on a portable ink jet or thermal printer.


Click to download full-size pic (37kb)300 SiL: PORTABLE WITH PC POWER AND WEATHERTIGHT HARDCOPY

An available option combines the EPCI-951 1 with the weather-tight plotter and packaging from the 1000AM, and an external ruggedized notebook/laptop computer to make an exceptionally field-worthy acquisition and plotting system. It is integrated with a 300-1 E winch to form a complete and very compact unitized 305 meter logging system. The entire logging system can be carried or shipped in one compact case and is capable of recording and generating logs in the field under the toughest conditions. The winch, uphole electronics and computer are all powered form an external 12 VDC source.



Winches for portable loggers tend to be viewed as generic devices that merely lower and raise a probe in and out of a borehole. This is only partially true, for how well they perform this seemingly simple function will, in many respects, determine how satisfactory a logger is to use.

Often on the ground, exposed to the elements, and adjacent to a recently drilled borehole, winches have to function in a wet, abrasive and corrosive environment. All Delta Epsilon winches are constructed of lightweight corrosion- resistant materials and all bearings are sealed and require no lubrication. The mercury-wetted slip rings are sealed and require no maintenance. All winches incorporate a disk brake and an overrunning clutch, which ensures that probe descent is controlled, and when logging uphole, if upward momentum stops for any reason, the probe cannot reverse direction or run away. It is also possible to precisely stop the probe at an exact spot in the borehole without it reversing direction or creeping backwards. All winches have an integral measuring wheel, resulting in a more compact design and eliminates the necessity of a connecting cable from a tripod mounted encoder. Most exposed surfaces are finished with a durable powder coat or hard anodize. All Delta Epsilon winches are characterized by fine machining, smooth and precise operation, practical rugged design and attention to detail. In addition to these shared features, each model has specific characteristics which complement its intended use and depth capacity.



The 300 series winches are our smallest, most portable and economical. They are ideally suited for near surface work up to 305 meters using .1" armored logging cable. Insulated "clean cable" may be fitted to these winches for environmental contamination work. Cable layering is accomplished with a manually initiated device that works on the twist of the cable, not against cable tension. This greatly reduces the required mechanical force, friction and operator intervention to adequately spool cable. The Delta Epsilon 300 series are unique among small winches in this respect.

When the hand cranked version 300-1 winch is combined with a 1000 AM acquisition system, they form what is the most portable, economical, compact, self contained digital borehole logger available since it requires no external power source. The 300-1 E motor drive is easily disengaged and may also be hand cranked if desired.



The 600-1 E is ideally suited to higher volume logging applications and depths up to 600 meters. It features a precision gear driven, ball bearing suspended level wind to evenly spool the cable on the drum, and an adjustable level wind clutch which allows the operator to make spooling adjustments while logging. It also features a continuously variable speed control with a modulated dynamic brake, efficient DC motor, emergency hand crank and integral surface electrode storage.


Click to load full-size pic (19kb)1000-lE ALTERNATIVE TO VEHICLE MOUNTED SYSTEMS

Though objectively not as portable as the other Delta Epsilon winches, and requiring 120 VAC 60 Hz power, the 1000-1 E is capable of logging holes up to 1000 meters and is ideally operated out of the back of a small truck or sport utility vehicle or can be transported by helicopter to remote locations. It may be carried short distances by two people and operated on the ground. It incorporates an automatic level wind and many of the same features of the 600-1 E. It is an economical and versatile alternative to large vehicle mounted systems



Using surface mount technology and innovative packaging, all geophysical probes are capable of being used in holes as small as 50mm. (2") in diameter. Length and weight have been reduced to manageable levels with the intent that the entire logging system will be carried in a passenger car or small truck and operated by one person. For any given combination of measurements, Delta Epsilon probes are among the shortest available and, in some instances, are less than half the length of competing products. From a design standpoint, there is no limit to the number of measurements that could be combined, but for practical reasons, we feel five related measurements is a meaningful limit. All digitization occurs within the probe and data are precisely and reliably sent by digital telemetry to the surface. Delta Epsilon has access to nearby USDOE borehole calibration models and several test boreholes including a 300 meter USGS drilled and cored test hole. Every system that we manufacture is field tested prior to shipment. Actual field test, and where appropriate, calibration data are supplied to the end user.

With resistivity logs acknowledged as the foundation of most water, geotechnical and environmental logging, Delta Epsilon has incorporated 16" and 64" normal resistivity measurements in a manner that does not require an isolation bridle, and can run them simultaneously on 0.1" single conductor cable in conjunction with gamma, r&sp logs. All of these logs are incorporated in our GE-4909 tool with a long normal adapter. In contrast to other systems employing isolation bridles which lose at least 25 to 50 feet or more of the upper part of the hole, Delta Epsilon probes incorporating resistivity measurements can run normal resistivity logs to the top of the fluid level in the hole. This is particularly advantageous in shallow holes and near surface surveys when 25 to 50 feet of additional data in the upper part of the hole often represents a significant part of the entire hole and may be the most crucial area of interest.