| 摘要 |
<p>Production equipment for oil and gas wells has features that allow accumulated liquid to be removed from the well without the need for a low pressure system. This equipment also isolates the preforations from accumulated liquid back pressure, even if there is insufficient hole depth below the perforations. The well has a tubing string located inside the casing, with the tubing in contact with the accumulated liquid. Both the tubing and the casing are connected to the sales line. Periodically, both the casing and tubing are shut-in, allowing formation pressure to build up in the casing. Then the tubing is opened to the sales line to discharge its accumulated liquid, it being driven by the higher formation pressure that has built up. To isolate the perforations from accumulated liquid, a standpipe is mounted in the casing above the perforations by a packer. The standpipe receives the lower end of the tubing which is closed except for a passage connecting it to the annular area between the standpipe and the casing. Produced fluid flows up the standpipe in a restricted area adjacent the tubing. At the top of the standpipe, liquid droplets drop out and accumulate above the packer between the standpipe and the casing.</p> |
