Method of in situ oil extraction using hot solvent vapor injection

摘要: Heavy oil or bitumen is extracted and removed from underground bearing formations having low permeability such as tar sands by injection of hot hydrocarbon solvent vapor into a single well hole at pressure not substantially exceeding the in formation to effectively heat extract bitumen. The passed downwardly through an annular passage concentric piping place bore injected out upper performations casing formation. condenses drains along with recovered lower perforations back bottom end inner pipe, which product mixture pumped above ground. partially reclaimed distillation means friction reheated reinjected for further use. used should be matched characteristics most effective recovery bitumen, contains aromatic compounds. As more dissolved formation, drainage are spread apart vertically so cause penetrate dissolve away hole.