Why Log?

Geophysical logs are performed to acquire data about the formation penetrated by a well, fluid in the well or a physical characteristic of the borehole. Each log is a record of a measured values across a specific depth, or range of depths in the well and most are presented as curves on grid paper.

Open-hole borehole geophysical logs are compared with the drill cuttings from the well to aid in interpretation of the formation the well penetrates. During the drilling process parts of some formations may fall from the upper  hole and mix with the samples from the lower formation. This can make interpretation difficult and errors may occur. By comparing the cuttings and borehole logs, a more accurate description of the lithology is possible. Along with the Drillers Log, any geophysical logs run on a well should be kept with all the records about the well.

Why Use welenco?

Since welenco's inception the company has made every effort to be the industry leader in both  the scope and quality of services we provide.  Our employees, our most important asset, have a combined 180+ years of logging experience!  In addition to that, we have the largest fleet of logging and video survey units on the west coast and enough logging tools to allow us to cover many jobs at once, often with little or no notice.  So, even if it is 10:00 p.m. on Sunday of a holiday weekend, welenco will probably be able to cover your job.

 A Word About Up-Hole Vs. Down-Hole Digitization

welenco inc. maintains logging systems which can digitize logged data  either at the surface or down-hole.  With advances in computer and electronic technology most logging tools manufactured today digitize the data down-hole and then send it to the surface to be analyzed.  To you the customer, there is no difference between data that has been surface digitized or down-hole digitized, data is data.  However, the new digital technology does have the advantage of allowing us to pack more sensors onto one tool, therefore reducing or sometimes eliminating the need for multiple logging passes.  This in turn reduces the total time the logger spends  in the hole and subsequently drill-rig standby time.  Other than that, the remaining benefits are to the tool operator in the form of ease of operation, flexibility of data manipulation and ease of maintenance.

Below is a reference chart that lists most of the logging tools we have available and their applications.  Call us and we will send you a copy of the guide free of charge.

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