| 摘要 |
A fluid injection device for controlling injection of fluid into an oil-carrying tube in an oil well, such as chemical injection valves incorporated into an artificial gas lift unit with multiple injection ports, includes an inlet for receiving the fluid; an outlet for supplying the fluid for injection into the oil-carrying tube; an inlet valve in a fluid path between the inlet and the outlet; an actuator for opening and closing the valve; and a connector for coupling the inlet to a fluid supply tube extending between the device and a source of the fluid above the ground. The invention facilitates use of a single supply pipe to feed multiple injection points with the ability to control injection at each point independently of the other and not rely on an over pressure to actuate the valves. |
