Because the decline curve is affected by physical properties of an oil reservoir, the theo-retical decline curve is obtained by the use of the data of reservoir conditions. In this paper the method of obtaining theoretical decline curve using reservoir data is explained, and funda-mental properties of both production decline curve and pressure decline curve are described.
A consideration of the linear flow of gas-dissolved water is described in this paper. The reservoir is 1, 500 ft in length and 10 ft2 in sectional area, having permeability of 17.5 darcys and relative permeabilities of curves shown in Fig.4. Gas-dissolved water flows into the reservoir under pressure of 800 psia and flows out under atmospheric pressure. The results computed on the rate of flow, on the pressure gradient, and on the gradient of water premeability are shown in Figs. 7 and 8. Accoring to the results obtained it becomes clear that the flow of gas-dissolved water can be treated as flow of pure water. The reason for this is that, free gas does not flow through the reservoir, because gas saturation in the reservoir is lower than equilibrium gas saturation.
For the purpose of obtaining an effective emulsifier for high pH Lime-emulsion drilling fluid, the humic acid has been researched in our oaboratory, and it has been found that it is superior to other various surface active agents. In this paper the effect of the humic acid upon drilling fluid is described.