| 摘要 |
Wellhead production apparatus is set forth. It is adapted to be connected to a cased well having a production tubing string therein. It cooperates with a plunger traveling freely in the production tubing string. The wellhead apparatus connects typically through a flange at the wellhead, a master valve, a vertically extending tube which connects into and comprises a tee. The equipment extends thereabove so that the plunger can travel above the tee and is rebounded for reciprocation. The tee is formed of two cylindrical members which are arranged concentric of one another to define an annular flow space therebetween. The annular flow space being connected through an opening into a lateral production flow line. The tee thus cannot be blinded by stalling the plunger even with the lateral flow line.
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