Slimline logging Tools16 Aug 2021 21:42
Have been reading an article produced by Richard Reischman and Robert Porter in a paper for the American Association of Drillers presented in Houston in April 2011
It describes difficult Drill Hole scenarios where conventional logging may be problematic as in our case, and how slimline tooling may be a solution!
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Abstract
Open hole logging of wells with adverse hole conditions and high deviations is now becoming more commonplace due to newly developed conveyance and acquisition systems. In many cases it can be impractical to obtain logs due to the cost and downside risk of doing so. On the flip side though, having this information can often significantly impact future drilling and completion decisions and possibly the ultimate success of a field.
There is now a system available that features an innovative hollow bit design. This design allows for mutiple methods of deployment of a specially designed slim logging string through the drill pipe and bit into open hole. Basic log information can be obtained in real time on wireline below the bit, in memory while tripping out with pipe, or a combination between the two depending on conditions. The specific method chosen depends on the well design and hole conditions. Added flexibility to ream, circulate, and even drill just prior to logging is also possible. The rig time to run logs, along with the associated cost and risk, can be minimized using this system when compared to other methods that are currently available. An overview of this system’s conveyance methods and equipment components will be presented along with some examples that illustrate its use in a variety of situations and wellbores, including horizontal wells.
Introduction
The successful acquisition of open hole log data is important for locating and quantifying potential producing horizons in newly drilled wells. Logs are needed to decide if the final completion of a well is justifed, and how to best proceed with optimizing the ultimate recovery of hydrocarbon reserves. A large percentage of the total cost of the well is attributable to the completion, especially when hydraulic stimulation is involved. Logging data has a significant impact on stimulation design.
There are often times when traditional wireline logs are difficult to obtain due to challenging hole conditions, including sloughing or swelling shales, ledges associated with washouts and high deviations. Horizontal wells present the ultimate challenge. Depending on the circumstances, other log acquisition methods including LWD and pipe conveyed logging are possible alternatives. The associated costs and risks of these other methods can often be substantial.
Continued on next post
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