For extra-low permeability reservoirs, with a permeability of about 0.3x 10-3 μm2, fluid flow and production performance in cores were studied. A long core hol
In recent years, air-foam combining the advantages of both liquid and air drilling has been utilized as a drilling medium. Air-foam drilling has proved its effi
The origin of anorthosite and associated igneous gabbronorite and ferrodiorite was investigated through detailed study of a typical massif-type anorthosite comp