| 摘要 |
In accordance with an illustrative embodiment of the present invention, a pressure equalizing and packer deflating valve apparatus useful in an inflatable packer straddle testing system included telescopically arranged mandrel and housing member defining test and inflation passages, first valve means for communicating the test passage with the well annulus when said members are extended to maintain pressure equalization as the packer elements are inflated, second valve means for communicating the inflation passage with the well annulus when the members are extended to enable packer element deflation; and third valve means that can be shifted in response to pump outlet pressure when said members are extended to a position preventing packer element deflation even though said second valve means is open. As said members are retracted, the third valve means is shifted to a position closing the inflation passage to maintain the inflation pressure therein.
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