Coil tubing string and downhole generator
First Claim
Patent Images
1. A borehole logging system for gathering downhole data and including a downhole electrical power generator, comprising:
- a unitary spoolable coiled tubing member arranged to be run into and out of the borehole and thereby selectively extended from the earths surface downhole location, said coiled tubing member comprised of nonmetallic structural materials and having a hollow centrally located core portion divided into a plurality symmetrical longitudinal cells for forming separated flow paths from the surface to the downhole location through said tubular member when extended into a wellbore; and
generator means mounted on said coiled tubing member and operable in response to fluids being conducted through said isolated cells for generating electrical power at said downhole location.
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Accused Products
Abstract
A borehole system for operating a downhole generator suspended on a composite coiled tubing string. The coiled tubing has at least two separate longitudinal chambers to provide separate flow paths. A fluid is pumped from the surface through one flowpath to drive a downhole turbine powered generator for operating downhole systems. A second flowpath in the tubing is used to return fluids to the surface. The non-metal environment of the composite coiled tubing provides a non-magnetic environment in which to operate wellbore devices. Data is transmitted to the surface by way of a fiber optic conductor.
313 Citations
19 Claims
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1. A borehole logging system for gathering downhole data and including a downhole electrical power generator, comprising:
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a unitary spoolable coiled tubing member arranged to be run into and out of the borehole and thereby selectively extended from the earths surface downhole location, said coiled tubing member comprised of nonmetallic structural materials and having a hollow centrally located core portion divided into a plurality symmetrical longitudinal cells for forming separated flow paths from the surface to the downhole location through said tubular member when extended into a wellbore; and generator means mounted on said coiled tubing member and operable in response to fluids being conducted through said isolated cells for generating electrical power at said downhole location. - View Dependent Claims (2, 4, 5)
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3. The apparatus of claim wherein said generator means has:
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a housing arranged for connection to said coiled tubing member; a turbine rotatably mounted in said housing; inlet means for directing fluids from one of said isolated cells into said turbine to rotate said turbine in said housing; electrical generating means connected to said turbine for rotation therewith; and fluid exit means for providing fluid communication with another of said isolated cells so that fluids can be moved from the earths surface down one of said cells through said turbine and then returned to the earths surface through another of said cells.
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6. A method of generating electrical energy downhole in a borehole, comprising the steps of:
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placing a fluid operated electrical generating device in a composite coiled tubing string constructed of nonmetallic structural materials, said coiled tubing string having at least two longitudinal isolated cells centrally located along the axis of said tubing string to form the core of said tubing string; extending the coiled tubing string from the earths surface to a downhole location in a borehole; moving fluids from the surface through one of the isolated cells in the tubing string to the electrical generating device downhole for generating electricity at the downhole location to operate a device downhole; and passing fluids from the downhole generating device back to the surface through another of said isolated longitudinal cells. - View Dependent Claims (7)
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8. An apparatus for providing electrical power for an electrically operated downhole device positioned in a borehole in the earth, the apparatus comprising:
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spoolable tubing means having a first end at the surface and a second end extending down into the borehole and a core portion centrally positioned within said tubing means, said core portion having at least two symmetrically arranged cells isolated from one another for carrying fluid from one end of said tubing means to the other; means for directing fluid into a first cell of said tubing means at said first end thereof; fluid motor means attached to said second end of said tubing means for receiving the fluid from said first cell and directing the fluid into a second cell of said tubing means at said second end thereof, said fluid motor means further including a shaft mounted for rotation about its axis and means for rotating said shaft by movement of fluid in said fluid motor; electric generating means connected to said rotatable shaft of said fluid motor means for generating electrical energy; and means for connecting a downhole electrically powered device to said electrical generating means. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for providing electrical power for an electrically operated downhole tool positioned in a borehole in the earth, the method comprising the steps of:
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inserting a composite coiled tubing string into the borehole, said coiled tubing string being constructed of non-metallic materials and having at least two longitudinal isolated cells; directing fluid into a first cell at a first end of said coiled tubing string which extends into the borehole with its second end; receiving the fluid from the first cell into a fluid motor at the second end of the tubing string; rotating a shaft within the fluid motor by movement of the fluid in the fluid motor; directing the fluid into a second cell at the second end of the tubing string to return to the first end thereof within the second cell; generating electrical energy with an electric generator connected to the rotating shaft of the fluid motor; and conducting the electric power to the downhole tool connected to the end of the electric generator. - View Dependent Claims (15, 16)
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17. A coiled tubing string for running downhole tools from the earths surface into a deviated borehole to a downhole location comprising:
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a continuous composite tubing member constructed of nonmetallic structural materials designed, constructed and arranged to permit compressive forces to push a downhole tool through a deviated portion of a borehole, overcoming frictional forces produced by engagement of the downhole tool and tubing member with the borehole walls, said tubing member having a plurality of symmetrical chambers forming a longitudinal core portion within said tubing member for providing isolated fluid conduits through the tubing member from the surface to the downhole location. - View Dependent Claims (18, 19)
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Specification