| 摘要 |
The present invention discloses a by-pass valve (18) for use in well testing. It is desirable to test a petroleum formation under both static and flowing conditions. This has usually been effected utilising complicated and relatively expensive apparatus and procedures. …<??>The present invention provides for the use of a simple by-pass valve (18) which can be retrievably located in well tubing by simple wire-line techniques. The valve (18) of the present invention has a body (23,24) having a seat (26) therein, a valve member (27) being cooperable with said seat (26). A first spring (29) urges the valve member (27) towards one of open and closed positions and a plunger (31) is connected to the valve member (27) to move with the valve member (27) between the open and closed positions. The connection between the plunger (31) and the valve member (27) provides for movement of the plunger (31) relative to the valve member (27) after the valve member (27) reaches the other of said open and closed positions. A second spring (38) opposes relative movement between the plunger (31) and the valve member (27) and pulling means (43) are arranged to releasably latch onto the plunger (31), latch release means (36) being arranged to release the pulling means (43) from said plunger (31) upon movement of the plunger (31) a selected distance towards said other position after the valve member (27) has moved to said other position. Thus the present invention basically provides a well testing system and method in which a by-pass valve (18) is positioned in the tubing (14) and a probe (19) run on a line from the surface opens and closes the valve (18) with vertical movement of the probe (19). The probe (19) when located in the valve (18) is exposed to formation fluids and may transmit back to the surface, or may record information about the formation. The probe (19) may also collect a sample of fluid to return to the surface with the probe. |
