| 摘要 |
<p>A logging tool (60) for measuring the fluid flow rate in a well, comprising a measuring pipe (65) provided with a flowmeter, a packer device (66) designed to derive the whole fluid flow (63) into the measuring pipe (65), and means for increasing, through the fluid flow action, the pressure of the fluid located upstream of the packer (66), in the form of an obstacle disposed in the fluid flow path, at, or downstream of, the exit of said packer. The obstacle is e.g. a valve (80,83) responsive to flowing fluid pressure on one side and to a biasing spring (84) on the other side. According to another feature, the packer (66) includes, in its bottom end (66b) designed to seal with the casing wall, an annulus sealing means (91) defining a tubular chamber (92) able to be inflated under the sole fluid action; the annulus sealing means (91) are made by two circumferential parts, facing one another, and fixed along their upper and lower perimeters; the tubular chamber (92) is in communication with the fluid flow (63) and adapted to expand radially upon the application of fluid pressure while being substantially longitudinally non-extensible.</p> |
