Subsurface distribution of acoustic velocities obtained through the Continuoous Veocity Logging is useful for identification, correlation and evaluation of geological formations, and is also used with success to interpret seismic reflectiono records in geophysical words. The Japan Petroleum Exploration Co., Ltd. has carried out some tentative works in the last two years, to check limits of adaptability of this tool to oil-field development works in Japan. In this paper an attempt will be made to give an outline of the Velocity Surver.
Following the previous study at the laminar flow region, in this paper are reported the results of experiment on the flow of bentonite mud at the turbulent flow region. Regnolds number based on apparent viscosity is about 2320 at the critical point of the flow of bentonite mud. The turbulent vissocity can be used to calculate the pressure loss of bentonite mud within 10% error.
The fundamentals of performance of the gas-lift well drilled in the formation which contains gas-dissolved water are written in this paper. The method is presented for predicting the gas production by means of gas-lift method applied to a well producing gas-dissolved waterfrom two formations as shown in Fig. 1. Some of the results obtained are as follows: (1) except for a low pressure formation, the production increases with the increase of gas injection, (2) when the gas-lift method is applied to this well, the production of the two zones is about 1.3 times that of the lower zone only. The cause may be due to the higher bottom hole pressure created by flowing water which contains a small amount of gas from the shaller zone into the well.