Electrical submersible pumps in the riser section of subsea well flowline
First Claim
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1. A subsea well production assembly for producing well fluid from a subsea well, comprising:
- a riser extending upward from the well to at least near sea level and having an upper end;
an electrical centrifugal pump suspended within the riser for pumping the well fluid up the riser.
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Abstract
A riser is installed which extends from a wellhead near the sea floor to near sea level. An electrical submersible pump assembly is suspended within the riser to pump well fluids up the riser. The electrical submersible pump includes impellers for displacing well fluids, and a base member having an intake port for receiving well fluid. The pump assembly can also include a separator for separating any gases from the well fluids, a packer for sealing the pump to the riser, coiled tubing from the pump to at least the upper end of the riser, or NPSH stages to aid in pumping a mixed flow of well fluids and gas.
48 Citations
20 Claims
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1. A subsea well production assembly for producing well fluid from a subsea well, comprising:
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a riser extending upward from the well to at least near sea level and having an upper end;
an electrical centrifugal pump suspended within the riser for pumping the well fluid up the riser. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a subsea well production assembly having a wellhead at a sea floor, a riser extending upward from the sea floor to at least near sea level, the improvement comprising:
a tubing extending through the riser from an upper end of the riser to the proximity of the wellhead; and
a centrifugal pump assembly secured to the lower end of the tubing above the wellhead for pumping well fluid upward from the wellhead to the upper end of the riser.- View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for producing well fluid from a subsea well, comprising:
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(a) installing a riser from a wellhead near the sea floor with an upper end at least near sea level;
(b) suspending an electrical centrifugal pump in the riser; and
(c) pumping well fluid up the riser with the pump. - View Dependent Claims (18, 19, 20)
installing a separator below the pump and separating gas from the well fluid prior to entering the pump.
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19. The method according to claim 17, wherein step (b) comprises suspending the pump on a tubing and step (c) comprises pumping the well fluid up the tubing.
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20. The method according to claim 17, wherein step (b) comprises suspending the pump on a tubing and step (c) comprises pumping the well fluid up an annulus in the riser surrounding the tubing.
Specification
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Current AssigneeBaker Hughes Incorporated (Baker Hughes Company)
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Original AssigneeBaker Hughes Incorporated (Baker Hughes Company)
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InventorsShaw, Christopher K.
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Primary Examiner(s)DANG, HOANG C
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Application NumberUS09/657,261Time in Patent Office663 DaysField of Search166/335, 166/105, 166/106US Class Current166/335CPC Class CodesE21B 17/01 RisersE21B 43/01 specially adapted for obtai...E21B 43/128 Adaptation of pump systems ...E21B 43/36 Underwater separating arran...F04D 13/086 the pump and drive motor ar...F04D 13/10 adapted for use in mining b...
