| 摘要 |
<p>PURPOSE:To predict the blowout flow rate and well characteristic of fluid in a well being drilled by adding an analysis of relative permeability to both analyses of vertical two-phase flow in the well and steady radial flow of the fluid in a reservoir, and finding such a condition that parameters are accorded with each other by repetitive calculations. CONSTITUTION:A fluid flowing into a geothermal well from a geothermal reservoir is partitioned off into single-phase flow, bubble flow, slag flow, intermediate flow and mist flow, finding the extent of density and frictional loss in each state. Next, the sum of values between pressure by the frictional loss at a minute interval of the well and fluid pressure consisting of a product of the density and interval length is found, thereby calculating the extent of pressure at a feed position in blowout. Successively, a flow rate of the fluid flowing into the well from the geothermal reservoir is calculated from a difference between pressure in the geothermal reservoir and another pressure at the feed position in the blowout. Then, a saturation factor of liquid phase of two-phase flow in the geothermal reservoir is also found out of the pressure at the feed position. In addition, a relative permeability curve is selected from the saturation factor of this liquid phase, regulating the flow rate of each phase of the two-phase flow, through which such a condition that these pressure values at the feed phase are accorded with each other is found out, thus the flow rate of the fluid flowing into the well from the geothermal reservoir is calculated in this way.</p> |
