Change of Production Rate when the Bottom Hole Pressure stays Constant: In this cases, the boundary condition is Eq. (3.1), instead of Eq. (2.8) in II.
In order to obtain the fundamental properties of a rock bit the gear-type cutters are tested. Factors which affect the drillability of a rock bit are determined and those results are described in this paper.
The typical cores of VIII, IX zones in Yabase oil field are analysed by the differential thermal analysis and the results of analysis are described in this paper. In addition a few experiments about swelling of clay are explained.