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| Number | Title | Issue Date |
| 7185706 | Arrangement for and method of restricting the inflow of formation water to a well An arrangement for restricting the inflow of formation water from an underground formation to a hydrocarbon producing well, where, between the underground formation and a production tubing (38) located in the well, there is disposed at least one flow chamber ... | 03/06/2007 |
| 5066198 | Gas lift valve A gas lift valve of the unloading type having a main valve for controlling fluid flow between a well casing and a well tubing, a volume of compressible liquid a spaced distance from said main valve and subject to casing pressure, and a pilot valve between... | 11/19/1991 |
| 4437514 | Dewatering apparatus Method and apparatus for dewatering a gas well in which the level of water in the well may be maintained at a fairly constant low level employing a diverter valve for introducing liquid into the tubing which valve is maintained closed when the liquid leve... | 03/20/1984 |
| 4067350 | Gas lift valve A gas lift valve capable of being actuated by fluid such as a predetermined liquid head in a tubing string or by gas in a casing surrounding the tubing for introducing lifting gas from the casing into the tubing for lifting liquid in the tubing from one e... | 01/10/1978 |
