MainLog is truly a real time program in that it has the ability to read and even control some gas detection instruments and/ or read a “wits” feed from them. It can also read and plot wits data being sent in from an EDR directly to the mudlog. Even MWD gamma can be wits in, in real time. You are actually looking at and working with a mudlog all the time, no importing of spreadsheets, text or LAS files to delay you in the log presentation. Entering in descriptions, notes, well information, as well as editing, is all done while incoming ROP, gases and wits data are being plotted in real time.

In the data acquisition mode, MainLog displays a Wits and Gas Monitor box showing the incoming data.

MainLog can read directly from most gas detection instruments via a Modbus interface. In this mode a real time gas chart can be displayed showing chromatograms, the hot wire reading, depth marks, lagged depth and time. Annotations can also be made easily on the chart. It creates a 24-hour chart file that is saved and stored for review at any time, even after the well is done.

The ability to create and embed all morning, show and DST reports in the mudlog. Makes it easy to access, view and print reports. When creating a new morning report MainLog will automatically calculate the following information and enter it into the report:

• Date & time
• Day & Report number
• Depth
• Footage made since last report
• Ft/hr
• Header information
• Current background gas
• Maximum gas since last report & any trip or connection gas

After being created the morning reports can be accessed by just clicking on the letter "R" in the ROP column; the letter "S" for show reports, the letter "D" for DST’s and "P" for jpegs of sample photos.

LAS Files can be easily created in the field or office version under the Options tab. LAS Version 3 is also available. (includes descriptions in the LAS file) No need to create a template, as all data on the log, including gamma will be included in the LAS file. There is also an option to automatically create and send an LAS file in with the mudlog.

The logger and office user can create a TIF, BMP, JPG, and PNG file of the mudlog or horizontal log. A PDF file can also be created with additional software, Adobe or freeware CutePDF.

With the “Quick View” menu the user can easily view a 5”, 2” or 1” vertical or horizontal log.

Horizontal Logs are easily created by either manually entering-in surveys or importing them into the working mudlog.

When entered in, MainLog will create the horizontal log and it can be viewed and printed in a 5”, 2” or 1”format. It can also be saved as a TIF, JPEG, BMP, PNG or PDF file.

The five Inch horizontal is easily drawn from the working mudlog with little or no additional logger input. Redundancies such as re-writing descriptions or surveys are not necessary to create the 5”, 2” or 1” horizontal. Anchor and target e-log curves can be imported onto the horizontal log to help correlate while drilling.

In the Horizontal Set-up Menu there are many options available including:

• Gas, ROP and Gamma Scale changes
• Logarithmic or linear gas scales
• Drawing depth from
• Figuring regional dip for target gamma’s

Another feature of MainLog is the ability for the logger and office geologist to import E-logs curves for correlating and even to calculate water saturations. Offset gamma ray curves can be clicked and dragged up or down to determine how high or low you are to that well. After importing the e-log curves to the mudlog file you can go to the Scheme’s tab and display any data contained in the mudlog or E-log curve file. There are six data sets which you can name and display with a click of the mouse.

If the resistivity and porosity curves are imported the water saturations will be calculated and the user has the ability to change the values for RW, a, and m in the Archie Equation and select the depths for those values as well.

Integrating a jpeg photo of a sample cutting is as easy as naming the photo at the depth it was taken (i.e. 7020.jpeg) and copying it to the c:/MainLog directory. MainLog handles it from there and the client can easily open it once the log is e-mailed in by just clicking on the letter P in a blue box, from the mudlog.

Log colors: The logger and office user has the ability to choose any color for any curve, descriptions or notes on the log.

With MainLog two additional custom tracks are available to plot additional information being wits in such as, WOB, SPM, PP and Torque. D-exponent can also be plotted with the correct information being wits in.

A theoretical lag can be calculated by entering the specific drilling parameters. With a wits feed from the EDR, lag can be calculated using strokes. Even down hole motors can be figured in.

Alarms can be set by depth, time, high or low gas, drilling breaks, long feet and even when to catch a sample. A wits alarm can also be set up as shown below.

To aid in correlating on a horizontal well, projections can be made by clicking and dragging on the last survey point on the 5” horizontal log. MainLog will show the TVD at the measured depth the point was dragged to, and give the inclination to get there. The example also shows an imported Target gamma to aid in correlating.

On one-man jobs, Mainlog can mark the lag depth on the log to aid the logger with rough neck caught samples.

Tops lines can easily be drawn onto vertical and horizontal logs. Once drawn you can click and drag on the “tops Line” and subsea will be recalculated. When created the Top becomes part of the “Tops Menu” and by selecting it will take you to that point on the log.

Using the “Zoom” feature shows the entire well on the right side of the screen. Click on any part of the well and it will take you there on the 5-inch log.