The oil and gas industry relies heavily on wireline logging, to obtain a continuous record of a rock formation and its properties. The results then allow them to find out further properties, such as hydrocarbon saturation and formation pressure, which will make further drilling and production decisions a lot easier looking ahead.
Wireline logging is performed by lowering a ‘logging tool’ on the end of a wire line into an oil well (or borehole) and recording petro physical properties using a variety of sensors. Logging tools that have been developed over years measure the electrical, acoustic, radioactive, electromagnetic, nuclear magnetic resonance and many other properties of rocks and their contained fluids, allowing them to evaluate before looking ahead to reap the advantages.
Data is recorded at surface or in the actual hole. In an electronic data format that can then be either be recorded through printing or electronic presentation called a “well log” that is then provided to the client. An electronic copy of the raw data is made up and well logging operations can either be performed during the drilling process. This provides real time information about the formations being penetrated by the borehole, or once the well has reached a total depth and the whole depth of the borehole is able to be logged.
There are a variety of different types of wireline logs, which are often categorized by singling out their functions or alternatively by the technology that they use. “Open hole logs” are run before the oil or gas well is lined with pipe or cased. “Cased hole logs” are run after the well is lined with casing or production pipe. Wireline logs can also be divided based on what physical properties they measure, making up the different categorization methods.
Robertson Geologging are developers of slim-hole digital borehole logging systems and techniques and are also one of the largest global suppliers for slim-hole and bore-hole logging equipment.
For more information on wireline logging, please visit: http://www.geologging.com/