Métodos y dispositivos para el monitoreo de esfuerzos, desgaste y sumergencia en pozos petroleros desviados con bombeo mecánico
AssigneeYpf TecnologíA S.A.
InventorsGustavo Ariel MORENO, Abel Esteban GARRIZ
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Abstract
Methods for monitoring and diagnosing the operation of a deviated oil well pumping system comprising sucker rod string driven by a polished rod, as well as devices for carrying out such methods, are described. The methods employ mathematical models incorporating phenomena not contemplated in the methods of the prior art, providing advantageous results for the adequate operation of a non-vertical oil well.
Claims13
A method for determining the stress profile in an oil well pumping system comprising a sucker rod string operated by a polished-rod, based on the axial position of the sucker rod string, where the method comprises the following steps:
- a) obtaining a measurement of the position of the polished rod at the surface,
- b) obtaining a measurement of the force on the downhole pump,
- c) calculating the value of the force on the polished rod at the surface by numerically solving a system of equations representative of the pumping system in a natural generalized coordinates system using measurements of the position of the polished rod at the surface and the force on the downhole pump,
- d) calculating the stresses at each axial position of the rod string from the measurement of the force on the downhole pump and the value of the force on the polished rod at the surface calculated in c), and
- e) associating to each stress calculated in d) the corresponding axial position of the sucker rod string in order to obtain the stress profile.
A method for diagnosing the operation of an oil well pumping system comprising a sucker rod string driven by a polished rod, where the method comprises the following steps:
- a) obtaining a measurement of the position of the polished rod at the surface,
- b) obtaining a measurement of the force on the polished rod at the surface,
- c) calculating the value of the force on the downhole pump by numerically solving a system of equations representative of the pumping system in a natural generalized coordinates system using measurements of the position of the polished rod and the force on the polished rod at the surface,
- d) obtaining a diagnosis of the operation of the pumping system from the value of the downhole force calculated in c).
A device for monitoring the operation of an oil well pumping system comprising a sucker rod string driven by a polished rod, where such device comprises, in a single housing or enclosure:
- at least one data acquisition unit,
- at least one source of energy and
- at least one processing unit,
- where this data acquisition unit obtains a measurement of the position of the polished rod at the surface and a measurement of the force on the downhole pump and such processing unit calculates the value of the force on the polished rod at the surface by numerically solving a system of equations representative of the pumping system in a natural generalized coordinates system using the measurements of the polished rod position at the surface and the downhole pump force.
(canceled)
Dependencies are inferred from the claim text.