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Method of operating an oil and gas production well activated by a pumping system

  • US 6,119,781 A
  • Filed: 02/04/1999
  • Issued: 09/19/2000
  • Est. Priority Date: 02/13/1998
  • Status: Expired due to Term
First Claim
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1. Method of operating an oil and gas production well activated by a pumping system, comprising, placed at the wellbottom, a submerged pump (5) driven by an electric motor (6) which draws a known amount of current, the said well comprising, at its top, an oil-outlet choke (17) and a gas venting choke (22), characterized in that it comprises a starting phase which consists in running the following steps:

  • a preparative step which consists in;

    acting on the gas venting choke (22) to bring the pressure upstream of the said choke to a predetermined starting value,acting on the oil outlet choke (17) to bring the pressure upstream of the said choke to a predetermined starting value,re-closing the oil outlet choke (17),checking that, with no power applied to the electric motor (6), the condition of the pump (5) is compatible with starting,a start-of-production step which consists in;

    gradually applying power to the motor (6) until the pump (5) is running at a predetermined minimum speed,checking, after a time, that the pressure upstream of the oil outlet choke (17) has exceeded a predetermined pressure-rise threshold,checking, after a time, that the current drawn by the electric motor (6) has exceeded a predetermined threshold,leaving the pump (5) running if these two thresholds have been exceeded, otherwise stopping the pump (5),gradually increasing the extent to which the oil outlet choke (17) is open, up to a predetermined value,waiting for a predetermined stabilizing time,checking for correct operation by simultaneously making checks on the current drawn by the motor (6) and on the production of the well using at least one production indicator,regulating the pressure upstream of the gas venting choke to the predetermined starting value.

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