Method and equipment for obtaining energy from oil wells

• US 5,117,908 A
• Filed: 09/28/1990
• Issued: 06/02/1992
• Est. Priority Date: 03/31/1988
• Status: Expired due to Fees

• Current Assignee: KSB AG (Ksb Stiftung)
• Original Assignee: KSB AG (Ksb Stiftung)
• Inventors: Hofmann, Heinrich
• Primary Examiner(s): Dang, Hoang C.
• Application Number:
  US07/585,124
• Time in Patent Office: 613 Days
• Field of Search: 166/75.1, 166/66.4, 166/104, 166/267, 166/357, 166/369, 290/43, 290/52, 290/54, 60/398, 60/419, 60/485, 417/334, 417/335, 417/348, 417/350, 417/390-393, 417/408, 417/442
• US Class Current: 166/267
• CPC Class Codes: E21B 43/01 specially adapted for obtaining from underwater installations
• CPC Class Codes: E21B 43/34 Arrangements for separating materials produced by the well
• CPC Class Codes: F03G 7/04 using pressure differences or thermal differences occurring in nature F03G7/06 takes precedence

Abstract

Pressurized petroleum flows from a well into a turbine. The petroleum undergoes a pressure reduction in the turbine and then enters a separation chamber where it is separated into liquid and gaseous phases. The liquid phase is sent to a pump which serves to transfer the liquid phase to a station remote from the well. Similarly, the gaseous phase is directed to a compressor which functions to transfer the gaseous phase to a station remote from the well. The pump and the compressor are coupled to the turbine which uses the energy liberated by the petroleum during pressure reduction to drive the pump and the compressor.

Claims

1. An installation for the recovery of petroleum from a well, comprising a turbine having an inlet, an outlet and an expansion chamber between said inlet and said outlet;

first connecting means connecting the well with said inlet in such a manner as to prevent significant pressure reduction of the petroleum upstream of said chamber;

means for separating the petroleum into a nongaseous flowable component and a gaseous component;

second connecting means connecting said separating means with said outlet;

means for conveying the components from said separating means to at least one location remote from the well and including at least one driven conveying device; and

means coupling said turbine to said one conveying device so that said turbine can drive said one conveying device in response to pressure reduction of the petroleum in said chamber.

2. The installation of claim 1, further comprising a generator, said coupling means including means which couple said turbine to said generator in such a manner that said turbine can drive said generator in response to pressure reduction of the petroleum in said chamber.

3. The installation of claim 1, wherein said turbine comprises a reversible centrifugal pump.

4. The installation of claim 1, wherein said coupling means comprises a common shaft for said turbine and said one conveying device.

5. The installation of claim 4, further comprising an electric motor or generator unit mounted on said shaft.

6. The installation of claim 1, wherein said turbine has a plurality of stages including a final stage and said outlet is provided at said final stage, said turbine having an additional outlet at another of said stages;

and further comprising third connecting means connecting said additional outlet with said second connecting means.

7. The installation of claim 6, wherein said third connecting means comprises a valve.

8. The installation of claim 7, wherein said valve is adjustable.

9. The installation of claim 1, further comprising a generator and an electric conductor extending from said generator to a location remote from the well, said coupling means including means which couples said turbine to said generator in such a manner that said turbine can drive said generator in response to pressure reduction of the petroleum in said chamber.

10. The installation of claim 9, further comprising an additional driven conveying device at another petroleum well for conveying a petroleum component away from the other well, said conductor being connected to said additional conveying device.

11. A method of recovering petroleum from a well, comprising the steps of withdrawing a stream of the petroleum from the well;

subjecting said stream to a pressure reduction;

separating said stream into a nongaseous flowable component and a gaseous component subsequent to said pressure reduction; and

conveying at least one of said components from the well using at least a portion of the energy derived from said pressure reduction.

12. The method of claim 11, further comprising the step of generating electricity from said energy.

13. The method of claim 12, further comprising the step of transmitting said electricity to a location remote from the well.

14. The method of claim 12, further comprising the step of recovering petroleum from another well using said electricity.