In the process of stratigraphic evaluation, gamma-ray (GR) logging is a commonly used method for quickly identifying rock types and determining changes in shale content. However, when interpreting the logging curves, it should not be simply assumed that “high GR values indicate shale and low GR values indicate sandstone”. More importantly, what geological features do the…
Formation evaluation is a critical process in the oil and gas industry used to determine the physical and fluid properties of subsurface formations. It helps engineers identify hydrocarbon-bearing zones, evaluate reservoir quality, and make informed drilling and production decisions. Among various evaluation methods, well logging is one of the most efficient and widely used techniques….
Formation evaluation in unconventional reservoirs, such as shale gas, tight oil, and coalbed methane, presents unique challenges due to the low permeability and complex geology of these formations. Traditional well-logging techniques often fail to provide the necessary resolution and accuracy for effective evaluation and development of these resources. Consequently, specialized well-logging techniques have been developed and…
Formation evaluation is a critical aspect of oil and gas exploration and production. It involves the assessment of subsurface geological formations to determine their potential to store and produce hydrocarbons. One of the most effective ways to perform formation evaluation is through the use of downhole tools, which provide real-time data and insights into the characteristics…
Density logging is an essential technique in the oil and gas industry. By measuring the bulk density of subsurface formations, this method provides critical insights into the geological structure, helping in reservoir characterization, formation evaluation, and resource estimation. What is Density Logging Density logging is a type of well logging that measures the electron density of rock…
Well cementing is serving as the backbone for well integrity and long-term production efficiency in oil and gas operations, ensuring the isolation of different subterranean formations and providing structural support to the wellbore. Evaluation and diagnostics in well cementing are essential to ensure the operation is successful and to prevent potential issues that could compromise the well. Importance of Evaluation and Diagnostics…
Geophysical well logging stands as a cornerstone technique, providing invaluable insights into geological formations, fluid properties, and resource potential. It involves the deployment of specialized instruments and sensors down a borehole to measure various physical and chemical properties of rocks, fluids, and formations. Let’s delve into the science, importance, methodologies, and applications of geophysical well logging. Understanding…
Well logging, the practice of recording geological and petrophysical data from boreholes, provides crucial insights into reservoir properties, formation characteristics, and fluid compositions. Traditional well logging tools have served the industry well, but the demand for more comprehensive data and operational efficiency has spurred the development of multifunctional well logging tools. In this article, we delve…
Oil and gas wells are engineered structures that provide a controlled connection between underground hydrocarbon reservoirs and surface facilities. The process of drilling and producing a well involves several stages, including exploration, well planning, drilling, casing, cementing, completion, production, and later workover or intervention. Operators rely on modern drilling rigs, simulation technologies, and monitoring systems to…
Well intervention is the set of jobs done on an oil or gas well after it is already built. The goal is to bring back output, keep it steady, raise performance, or extend the time the well can produce, which is different from drilling a brand new well. With well intervention, workers reach into an existing…