Southwestern Part of Mt. Chookai where is covered with its lavas and detritus, has been explorated by geophysic methods and wells these few years. Results of exploration are outlinedin followings; (1) Oil accumulation and reservoir conditions in Fukra field were controlled by sea bottom high which had existed during Tentokuji grey mudstone depoisted. (2) At Masukawa, Katsurane alternated facies quickly change its thickness from north to south. It is presumable that warping or arching actions occurred in late Tentokuji in this district. (3) From studies of stratigraphic sections, it is reasonably expected that oil have accumulated in Katsurane formation at Higashi-Fukura, westside of Masukawa, and in Katsurane, Funakawa and Onnagawa formations near nakamura, eastside of Masukawa.
By the use of an upright glasspipe the capacity of upward blow of liquid to carry cutting is tested. As shown in the figures, the carrying capacity of flowing liquid increases as both the velocity and viscosity of liquid increase.
The accumulation of water in wellbores has become difficult to produce natural gas and liquid hydrocarbons. In that place, the application of foams to remove water column and foaming ability of non-ionic surface active agents is described in this paper.
The stimulation method to increrse the oil productivity by injecting fluid with high pressure and rate into the oil reservoir, where fractures are created and packed with the brought sand to keep the highly permeable channel for oil flow, is hydraulic fracturing. Therefore, at fracturing, how to pack fractures with what size of sand is very important. In this paper the discussion is made on properties which the fracturing sand must have, and further the conclusion is developed about “Hisanohama sand” of the most suitable fracturing sand as the result of study which has been made on properties, production status and others of Hisanohama sand being used for fracturing in Japan.