About Mud Logging

About Mud Logging

About Mud Logging

 THE PAST: How mud logging evolved with the development of horizontal drilling

In common with other forms of data acquisition, mud logging has emerged as a key contributor for placement and completion of horizontal wells. Horizontal wells require optimized geological and geomechanical placement within each reservoir unit to optimize long term production. This led to the development of geosteering. Over time, gains in the number and quality of data streams - such as Gas While Drilling (GWD) - have improved and refined wellbore trajectory placement.

THE PRESENT: How mud logging enhances unconventional asset development

Unconventional asset development is now presenting additional challenges which can be addressed by Advanced Surface Data Logging (ASDL) technology. State-of-the-art mud logging produces higher frequency and more accurate GWD measurements integrated with laboratory quality geochemical analysis of well cuttings using X-Ray Diffraction (XRD) and X-Ray Fluorescence (XRF) in near realtime at the wellsite. This information can produce more efficient fracturing programs that limit spending on zones of poor productivity, and ultimately enhance hydrocarbon production and recovery.

Unconventional asset development requires the drilling of many more wells than conventional development. This is very favourable for mud logging improvement because cost effective surface logging acquisition procedures can be employed and improved along the drilling campaign. The goal in understanding how to characterize the sweet spots for a given play is realized through their identification while drilling and by adjusting well placement and fracture design accordingly.

THE FUTURE: How mud logging technologies for unconventional asset development enhance conventional asset development

Contrary to unconventional basins where many wells are drilled, in conventional asset development (such as deepwater) we may not have enough wells to optimally characterize and produce the drilled formations. Improvements made in mud logging technologies as a result of unconventional asset development will benefit conventional developments with cost-effective primary data acquisition in addition to a backup solution to borehole data lost due to downhole tool limitations.


Excellence Logging promotes, researches, develops, documents, and improves Advanced Surface Data Logging technology. Our techniques have the advantage of being much less expensive to deploy than downhole technology. The information and interpretation results stand-alone but we recognize the additional benefit which can be realized in conjunction with both downhole and laboratory measurements.

The potential value of ASDL requires a rigorous interpretation workflow to be fully realized by the industry. This workflow (such as that described outlined in this document) must be systematically applied as an integral part of the drilling and logging process.

Our objectives ensure that these techniques shall be widely adopted by the industry. The result is a significant reduction in the cost of developing unconventional resources which allows our customers to remain competitive in a wider range of market conditions.

This document describes workflows available to the customer for advanced surface data acquisition and analysis of the samples collected while drilling. Following the sample analysis comes a series of data validation steps to produce accurate, timely, actionable information in support of our customer’s operations.

From beginning to end, our field personnel, operations managers and leadership team work relentlessly to offer our customers the quality products, exceptional service, and impeccable communication achieved only with Excellence Logging.