As a well-established and essential procedure for logging worldwide, slimhole logging has been praised throughout the years as a highly effective method. In the oil and gas industry, it is a staple for measuring the rock and fluids in any formation being tested.

Its genesis goes back September 5th, 1927 thank to the ingenuity of two brothers called Marcel and Conrad Schlumberger in France working for the Pechelbronn Oil Company. Success followed with the process initially being coined an ‘electric survey’ by the pair. Years passed before well-logging became standard in the USA which was the start of slimhole logging being called what it is today.

The application for the tools is fairly simple due to it being lowered into a ‘slim’ hole in which testing can commence. Cylindrical in shape with quite the small diameter, this makes it the line ideal for tight quarters. There are three types of logging tools most commonly used in the oil and gas industry.

Firstly, the tool is for spontaneous potential (meaning it could produce oil or not).  The voltage differs on the surface and also underground to help understand the yield of any substance below. With the implementation of further instruments, the tester can also determine the natural radiation of the substance to understand its temperature and pressure.

Another less conventional method is similar to a probe in that it is lowered before producing a small charge of a variety of different techniques. Typically, these include magnetic resonance; electric; inductive and acoustic amongst others.

Possibly the most rewarding process for any examiner is extraction itself. The mechanical aspect retrieves samples of the potentially rich rock before being brought back to the surface for inspection.

Thanks to all of this, slimhole logging is a very advantageous for any excavators to undertake. It allows for a swift result under examination, determining whether it’s viable to manage the potential oil and for its harvest in the long-run.