Schlumberger is an oil services company. It operates through the following segments: Reservoir Characterization, Drilling, Production, Intervention. The Reservoir Characterization segment delivers characterization models incorporating all the characteristics of the reservoir that are pertinent to its ability to store and produce hydrocarbons, including petrophysics, geology, geomechanics, and geophysics. The Drilling segment offers technologies bit and cutting element technologies, along with drilling fluids and mud logging capabilities for hole-making. The Completions segment helps to optimize the critical connection between reservoirs. The Production segment provides services, technologies, and tools to achieve reservoir life and yield. The Intervention segment manages to extend the life of producing wells.