| 摘要 |
<p>A testing string having a central flow passage therethrough and located in a fluid filled bore of an oil well extending from the earth's surface to an underground formation, a valving apparatus comprising: tubular housing means, including means for allowing axial movement therein, having a central bore therethrough for communicating at one end thereof with the flow passage of that portion of the testing string below the tubular housing, tubular operating mandrel means, located within the housing means central bore and having a central bore therethrough for communicating at one end thereof with the flow passage of that portion of the testing string above said operating mandrel and communicating at the other end thereof with the second end of the central bore of the tubular housing means to thereby form a continuous flow channel through said tubular housing means and the tubular mandrel means, for moving, within the limits of the axial movement allowing means, in a first direction responsive to weight in the testing string, and in a second opposite direction responsive to fluid pressure increases in the well bore, and, valve means located in the central bore of the housing means and operably connected to the operating mandrel means, for closing the continuous flow channel when the mandrel means moves in said first direction, and for opening the continuous flow channel when the mandrel means moves in said second direction, thereby providing control of fluid communication in the flow passage of the testing string responsive to weight and well annulus pressure increases.</p> |
