| 摘要 |
A downhole pump of the jet type for use in a borehole in order to produce fluid from the wellbore by employment of a power fluid source located above the surface of the ground. The power fluid flows through the jet pump assembly to cause a pumping action. The jet pump includes a suction chamber formed about a nozzle assembly. The nozzle is spaced from a venturi throat. The venturi throat diverges in a direction away from the nozzle. A deflector device is arranged concentrically with the nozzle and venturi. One end of the deflector is supported by the pump body, and a reduced convergent marginal free end is received within the divergent venturi throat, thereby forming an annulus between the throat and the deflector. The annular area increases in a downstream direction respective to the nozzle. The power fluid exits from the nozzle and enters the inlet of the venturi, causing produced fluid to be pulled into the throat entrance. The mixed fluids continue to flow through the throat and about the deflector and out of the venturi as the fluids are forced to continue through the pump and then to the surface of the earth. The deflector causes the power fluid to act against a greater surface area thereby utilizing all of the power fluid to its maximum advantage.
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