Wireline Operations. This is part of the Oil and Gas Production Series. Many of todayâs most vital oilfield operations depend directly on the use of wireline, a strong, thin length of wire cable mounted on a powered reel. Wireline is particularly important during completion and production. Field operators can run anything from a basic downhole directional survey to the most delicate gamma ray formation log on wireline.
The first modern solution of general relativity that would characterize a black hole was found by Karl Schwarzschild in 1916, although its interpretation as a region of space from which nothing can escape was first published by David Finkelstein in 1958.
1 First astronaut: Robert H. Lawrence, Jr., 1967, was the first black astronaut, but he died in a plane crash during a training flight and never made it into space. 2  Guion Bluford, 1983, became the first black astronaut to travel in space; Mae Jemison, 1992, became the first black female astronaut.