Category: Oil and Gas business

See gas migration

A flow regime in which gas, oil, and water are all flowing

The measurement versus depth or time, or both, of one or more physical quantities in or around a well. The term comes from the word “log” used in the sense of a record or a note. Wireline logs are taken downhole, transmitted through a wireline to surface and recorded there. Mud logs that describe samples of drilled cuttings are taken and recorded on surface.

The movement of hydrocarbons from their source into reservoir rocks (see also gas migration)

A well equipped to produce oil and/or gas separately from more than one reservoir. Such wells contain multiple strings of tubing or other equipment that permit production from the various completions to be measured and accounted for separately. For statistical purposes, a multiple completion well is reported as one well and classified as either an oil well or a gas well. If one of the several completions in a given well is an oil completion, the well is classified as an oil well. If all of the completions in a given well are gas completions, the well is classified as a gas well.

A generic term for several classes of self-contained floatable or floating drilling machines such as jackups, semisubmersibles, and submersibles

A person responsible for testing the mud at a rig and for prescribing mud treatments to maintain mud weight, properties and chemistry within recommended limits

In 1981 the US congress adopted a moratorium against drilling on the US outer continental shelf covering 5 km to 320 km offshore. The US EIA estimates that 18 billion barrels of oil are in the area covered by the moratorium which could be enough to match current US production for 10 years. However, a 2007 analysis by the agency concluded that opening up drilling in the moratorium area would not have a significant impact on domestic crude oil and natural gas production or prices before 2030. The primary concern about offshore drilling has been that unsightly oil rigs would damage tourism or that spills would threaten the environment. In July 2008 President Bush decided to remove the moratorium and permit drilling offshore

Drilling at different depths of a wellbore in order to increase productivity of the gas or oil