What is wireline logging?

Open-gap (Wireline) logging is one among an immense variety of measurements and analytic strategies utilized in formation evaluation of oil wells.

Wireline logging provides the satisfactory assembly situation for all formation evaluation ways in oil wells. Best through open-gap logging can a steady document of measurement versus depth be made of so many formation residences. In distinctive, wireline logs can report formation, electrical resistivity, bulk density, average and brought about radioactivity, hydrogen content material, and elastic module. These raw measurements can then be interpreted to present a steady measurement -versus-depth file of formation properties reminiscent of porosity, water saturation, and rock variety. Almost without exception, every well drilled for hydrocarbons (oil and fuel) is logged with wireline instruments.

With the cost of oil at this type of high accuracy now, more and more oil operating businesses are gearing up for more drilling, and for this reason, more wireline logging, to maximize their earnings at the moment of exorbitant oil prices.

The exact running of a log includes decreasing software on the end of a logging cable into an oil/gas well. A sensor, integrated into a sonde in conjunction with its related electronics, is suspended in the hole (well) by a multiconductor cable. The alerts from the sensor are conditioned using the downhole electronics for the upward transmission of the cable to the control panel at a surface which in flip stipulations the sign for the recorder. Because the cable is raised or decreased, it prompts some depth-measuring gadget, a sheave wheel (pulley) which in turn prompts a recording gadget. Ultimately, some form of reproduction takes place to furnish a hard copy of the recorded data which is referred to as the well log.

Normally, wireline logging jargon distinguishes between a logging survey/run, logging software, and a log as well as a curve. There’s customarily some confusion about these terms when logging matters are discussed. A logging survey is furnished by way of a logging carrier manufacturer for a patron. For the duration of the path of the logging survey, the logging engineer may rent a couple of logging tools, and document some distinctive logs on each of which might be provided several one-of-a-kind curves. The logging tools used, in turn, is also composed of multiple sensors.

Cased hole gamma ray

Gamma ray tools or instruments helps in documenting gamma radiation that naturally happens in the well adjacent to formations.The nuclear measurements determine the radioactive composition or content of the formations Gamma radiation tools are effective in any environment and they are known to be the conventional device for correlation of logs in cased hole. Applications of these tools include

  • Depth determination
  • Depth correlation
  • Qualitative assessment of radioactive mineral dump
  • Depth control for perforating cased hole
  • Identifications of lithology

Spectral gamma ray cased hole

Spectral gamma radiation tool offers intuition into the mineral content of mineral formation. The overall spectral gamma radiation was determined is resolves into 3 common component radiations that occur naturally in shale’s  and sand which are Uranium, thorium, potassium. These give information’s are used to differentiate imperative features of sand which are around the bore well


  • Delineation of the reservoir
  • Recognition or Identification of igneous rock
  • Capacity studies of cation exchange.