| 摘要 |
A plunger lift system has a plunger with main and ancillary sleeves that dispose in tubing. The sleeves can move in the tubing between a bumper and a lubricator. Both sleeves have a passage for fluid to pass therethrough, and the sleeves can fall independently of one another from the surface to the bumper. When disposed on the bumper, the sleeves mate together. Building gas pressure downhole can then lift the mated sleeves, which push a column of liquid along with them to the surface. The main sleeve has a narrow stem on its distal end with openings that communicate with the sleeve's passage. A nodule also extends from the distal end. The ancillary sleeve fits at least partially on the narrow stem, and an orifice in the sleeve's opening engages on the nodule. Thus, the mated sleeves close off fluid communication through the main sleeve's passage. |
