Gas-Lift Optimization in Satellite Wells ... OptIntro 1/31 Gas-Lift Optimization in Satellite Wells...

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Transcript of Gas-Lift Optimization in Satellite Wells ... OptIntro 1/31 Gas-Lift Optimization in Satellite Wells...

  • OptIntro 1 / 31

    Gas-Lift Optimization in Satellite Wells

    Eduardo Camponogara

    Department of Automation and Systems Engineering Federal University of Santa Catarina

    October 2016

  • OptIntro 2 / 31

    Summary

    Motivation

    Problem Formulation

    Santos Multi-Reservoir Production System

  • OptIntro 3 / 31

    Motivation

    Summary

    Motivation

    Problem Formulation

    Santos Multi-Reservoir Production System

  • OptIntro 4 / 31

    Motivation

    Motivation: production from mature fields

    Young oil field

  • OptIntro 5 / 31

    Motivation

    Motivation: production from mature fields

    Mature oil field (without artificial lifting)

  • OptIntro 6 / 31

    Motivation

    Motivation: production from mature fields

    Mature oil field (with artificial lifting)

  • OptIntro 7 / 31

    Motivation

    Motivation: production from mature fields

    Gas-lift system

  • OptIntro 8 / 31

    Motivation

    Motivation: production from mature fields

    60% of Brazilian oil fields are gas-lifted

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    Problem Formulation

    Summary

    Motivation

    Problem Formulation

    Santos Multi-Reservoir Production System

  • OptIntro 10 / 31

    Problem Formulation

    Practical Application

    Petrobras bundled:

    I An in-house well simulator (Marlim)

    I Algebraic Modeling Languages (GAMS and AMPL)

    I Optimization solvers (CPLEX, Gurobi, and CBC)

    in a software package denominated BR-SIOP. It is available in Infogrid platform to run on a computer cluster.

    Remarks:

    I The baseline version of BR-SIOP optimizes daily production of platforms that operate with gas-lifted satellite wells.

    I It is the most common configuration in Campos Basin.

  • OptIntro 10 / 31

    Problem Formulation

    Practical Application

    Petrobras bundled:

    I An in-house well simulator (Marlim)

    I Algebraic Modeling Languages (GAMS and AMPL)

    I Optimization solvers (CPLEX, Gurobi, and CBC)

    in a software package denominated BR-SIOP. It is available in Infogrid platform to run on a computer cluster.

    Remarks:

    I The baseline version of BR-SIOP optimizes daily production of platforms that operate with gas-lifted satellite wells.

    I It is the most common configuration in Campos Basin.

  • OptIntro 11 / 31

    Problem Formulation

    BR-SIOP GLC

    I Mathematical model for gas-lift optimization of satellite wells in offshore operations.

    I Model implemented in BR-SIOP, Petrobras.

  • OptIntro 12 / 31

    Problem Formulation

    FPSO Cidade de Santos

  • OptIntro 13 / 31

    Problem Formulation

    FPSO Cidade de Santos

    FPSO Santos produces from two reservoirs, Tambau and Urugua.

  • OptIntro 14 / 31

    Problem Formulation

    Sets

    I N : set of production wells.

    I P iwh: breakpoints for well-head pressure of well i . I Qigl: breakpoints for gas-lift injection rate of well well i .

    I Ri : breakpoint pairs considering well-head pressure and lift-gas rate for well i , P iwh ×Qigl, including naturally flowing conditions.

    I Ri+: breakpoint pairs not considering naturally flowing conditions, P iwh × {Q igl \ {0}}.

    I Ri0: breakpoint pairs considering only zero gas-lift injection rate, P iwh × {0}.

  • OptIntro 14 / 31

    Problem Formulation

    Sets

    I N : set of production wells.

    I P iwh: breakpoints for well-head pressure of well i . I Qigl: breakpoints for gas-lift injection rate of well well i .

    I Ri : breakpoint pairs considering well-head pressure and lift-gas rate for well i , P iwh ×Qigl, including naturally flowing conditions.

    I Ri+: breakpoint pairs not considering naturally flowing conditions, P iwh × {Q igl \ {0}}.

    I Ri0: breakpoint pairs considering only zero gas-lift injection rate, P iwh × {0}.

  • OptIntro 14 / 31

    Problem Formulation

    Sets

    I N : set of production wells.

    I P iwh: breakpoints for well-head pressure of well i . I Qigl: breakpoints for gas-lift injection rate of well well i .

    I Ri : breakpoint pairs considering well-head pressure and lift-gas rate for well i , P iwh ×Qigl, including naturally flowing conditions.

    I Ri+: breakpoint pairs not considering naturally flowing conditions, P iwh × {Q igl \ {0}}.

    I Ri0: breakpoint pairs considering only zero gas-lift injection rate, P iwh × {0}.

  • OptIntro 14 / 31

    Problem Formulation

    Sets

    I N : set of production wells.

    I P iwh: breakpoints for well-head pressure of well i . I Qigl: breakpoints for gas-lift injection rate of well well i .

    I Ri : breakpoint pairs considering well-head pressure and lift-gas rate for well i , P iwh ×Qigl, including naturally flowing conditions.

    I Ri+: breakpoint pairs not considering naturally flowing conditions, P iwh × {Q igl \ {0}}.

    I Ri0: breakpoint pairs considering only zero gas-lift injection rate, P iwh × {0}.

  • OptIntro 14 / 31

    Problem Formulation

    Sets

    I N : set of production wells.

    I P iwh: breakpoints for well-head pressure of well i . I Qigl: breakpoints for gas-lift injection rate of well well i .

    I Ri : breakpoint pairs considering well-head pressure and lift-gas rate for well i , P iwh ×Qigl, including naturally flowing conditions.

    I Ri+: breakpoint pairs not considering naturally flowing conditions, P iwh × {Q igl \ {0}}.

    I Ri0: breakpoint pairs considering only zero gas-lift injection rate, P iwh × {0}.

  • OptIntro 15 / 31

    Problem Formulation

    Parameters

    I q̂ io(whp i , qigl): oil rate from well i , at well-head pressure whp

    i and

    lift-gas injection qigl.

    I gor i : gas-oil ration for well i .

    I wcut i : water cut.

    I qigl,min: minimum lift-gas injection rate.

    I qigl,max: maximum lift-gas injection rate.

    I whpimin: minimum pressure.

    I whpimax: maximum pressure.

  • OptIntro 15 / 31

    Problem Formulation

    Parameters

    I q̂ io(whp i , qigl): oil rate from well i , at well-head pressure whp

    i and

    lift-gas injection qigl.

    I gor i : gas-oil ration for well i .

    I wcut i : water cut.

    I qigl,min: minimum lift-gas injection rate.

    I qigl,max: maximum lift-gas injection rate.

    I whpimin: minimum pressure.

    I whpimax: maximum pressure.

  • OptIntro 15 / 31

    Problem Formulation

    Parameters

    I q̂ io(whp i , qigl): oil rate from well i , at well-head pressure whp

    i and

    lift-gas injection qigl.

    I gor i : gas-oil ration for well i .

    I wcut i : water cut.

    I qigl,min: minimum lift-gas injection rate.

    I qigl,max: maximum lift-gas injection rate.

    I whpimin: minimum pressure.

    I whpimax: maximum pressure.

  • OptIntro 15 / 31

    Problem Formulation

    Parameters

    I q̂ io(whp i , qigl): oil rate from well i , at well-head pressure whp

    i and

    lift-gas injection qigl.

    I gor i : gas-oil ration for well i .

    I wcut i : water cut.

    I qigl,min: minimum lift-gas injection rate.

    I qigl,max: maximum lift-gas injection rate.

    I whpimin: minimum pressure.

    I whpimax: maximum pressure.

  • OptIntro 16 / 31

    Problem Formulation

    Parameters

    I ql,max: Liquid handling capacity of the platform.

    I qw,max: Water handling capacity of the platform.

    I qflare,max: Limit for gas flaring.

    I qflare,min: Minimum rate for gas flaring.

    I qgtc: Gas compression capacity.

    I qturbine: Gas demand for electric turbine.

    I qmaxexp : Maximum rate for gas exportation.

  • OptIntro 16 / 31

    Problem Formulation

    Parameters

    I ql,max: Liquid handling capacity of the platform.

    I qw,max: Water handling capacity of the platform.

    I qflare,max: Limit for gas flaring.

    I qflare,min: Minimum rate for gas flaring.

    I qgtc: Gas compression capacity.

    I qturbine: Gas demand for electric turbine.

    I qmaxexp : Maximum rate for gas exportation.

  • OptIntro 16 / 31

    Problem Formulation

    Parameters

    I ql,max: Liquid handling capacity of the platform.

    I qw,max: Water handling capacity of the platform.

    I qflare,max: Limit for gas flaring.

    I qflare,min: Minimum rate for gas flaring.

    I qgtc: Gas compression capacity.

    I qturbine: Gas demand for electric turbine.

    I qmaxexp : Maximum rate for gas exportation.

  • OptIntro 17 / 31

    Problem Formulation

    Parameters

    I (t ilb and t i ub) are two parameters that impose conditions on well

    operations:

    I (0, 0) forces well i to be closed during the optimization process. I (0, 1) allows the optimization algorithm to decide whether to

    operate well i or not. I (1, 1) forces well i to be producing. I (1, 0) not a viable setting.

    I enablei allows well i to operate without gas-lift injection, naturally flowing production.