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Specific Production Analysis workflow with basic Production Performance Metrics.


ApplicationSample Cases
First guess on redevelopment opportunitiesNatural Depletion Reservoir
Identify and prioritise surveillance opportunitiesWaterflood Sector Analysis
Assess current production performance:Oil Producer Analysis
  • current

Definition

Primary Production Analysis is the specific workflow and report template on Primary Well & Reservoir Performance Indicators.

Application

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  • status and trends of reservoir depletion against expectations

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  • current status and trends of

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  • waterflood efficiency against expectations

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  • comparative analysis of performance of different wells or

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Technology

Primary Production Analysis is built around production data against material balance and require current FDP volumetrics, PVT and SCAL models. 

It includes well-by-well diagnostics and gross field diagnostics, but may be extended to sector-by-sector diagnostics.

Metrics

Primary Production Analysis includes the following metrics:

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Background = STOIIP & Structure

Bubbles = qo, qg , qw, qinj

Number = VRR, Pe

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Background = STOIIP & Structure

Bubbles = Qo, Qg , Qw, Qinj

Number = VRR, Pe

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Left Axis = qo, qg , qw, qinj,

Rigth Axis = Yw, GOR, Pe , Np, Ninj

Hor Axis = Elapsed Time

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Decline Curve Analysis

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Left Axis = qo1, qliq1, qinj1,

Rigth Axis = Yw, GOR, VRR, Pe

Hor Axis = Elapsed Time

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Left Axis = qo1, qliq1, qinj1

Rigth Axis =Yw, GOR, VRR, Pe, Pem

Hor Axis = RF

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Left Axis = Yw, Ywm

Hor Axis = qliq

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Left Axis = GOR, GORgm

Hor Axis =qo

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Injection Efficiency Diagnostics

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Left Axis = PIR , PIRm

Hor Axis = Yw

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Left Axis = Pwf_IPR , Pwf_VLP

Hor Axis = qo

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Productivity Index Diagnostic

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Left Axis = JPI, JPIm

Hor Axis = dP = Pwf - Pe

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Below is the list of the production properties  involved on the above metrics.

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Cumulative Voidage Replacement Ratio

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{\rm VRR_{cum}} = \frac{B_w \, Q_{WI}}{B_w \, Q_W + B_o \, Q_O + B_g Q_G - B_g R_s Q_O}

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{\rm VRR_{inst}} = \frac{B_w \, q_{WI}}{B_w \, q_W + B_o \, q_O + B_g (q_G - R_s Q_O)}

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Recovery Factor

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{\rm RF} = \frac{Q_o}{V_{STOIIP}}

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Watercut

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{\rm Y_w} = \frac{q_w}{q_{lis}}

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{\rm GOR} = \frac{q_g}{q_o}

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q_{liq} = q_o + q_w

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Watercut model

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{\rm Y_wm} = \frac{1}{1 + \frac{K_{ro}}{K_{rw}} \cdot \frac{\mu_w}{\mu_o} \cdot \frac{B_w}{B_o}}

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PIR

Production Injection Ratio

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{\rm PIR} = \frac{Q_o}{Q_i}

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{\rm PIR_m} = { \frac{1}{VRR} }*{ \frac{1-Y_w}{ Y_w + (1-Y_w) [ \frac{B_o}{B_w} - \frac{B_g}{B_w}(Y_g - R_s) ] } }

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P_{wf} = P_e - \frac{1}{J_{PIo}} q_o

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JPI

Total Productivity Index

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{\rm J_{PI}} = \frac{Q}{P_e - P_{wf}} {\quad \Rightarrow \quad} P_{wf}=P_e - \frac{1}{PI}Q
  • well groups

  • first guess on areal distribution of recovery against expectations



AdvantagesLimitations
Fast TrackShort production forecasts only
Minimal input dataSometimes incapable to forecast
Straightforward analysisHigh level hint of reserves distribution only
Fair hints for underperforming wells and sectors


See Also

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Petroleum Industry / Upstream /  Production / Subsurface Production / Field Study & Modelling / Production Analysis

[ Production Performance Indicators @model ]

[ Dynamic Data Statistical Correlation ]

[ Well Location and Flow Rate Map ]

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{\rm J_{PIm} } = \frac{q_o}{P_e - P_{wf}} 
Expand
titlePIR equation deduction
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Y_w=\frac{q_q}{q_w + q_o} \rightarrow \frac{q_o}{q_w} = \frac{1-Y_w}{Y_w}
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PIR=\frac{q_o}{q_i}
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PIR = \frac{q_o}{q_i}={ \frac{1}{VRR} }*{ \frac{1-\gamma}{ \gamma +  [ \frac{B_o}{B_w} - \frac{B_g}{B_w}(GOR - R_s) ] } }

Diagnostic

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titleExpand

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groupsofoil

Введение

История добычи

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Карты разработки

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Падающая добыча

Стационарная добыча

Стационарная добыча это режим в котором давление на линии отбора поддерживается постоянным за счет газовой шапки, аквифера или закачки в нагнетательные скважины.

Растущая добыча

Динамика пластового давления

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Снижение пластового давления приводит к снижению пористости и проницаемости коллектора, что приводит к потере продуктивности и снижению дебита сквжаины.

Снижение пластового давления ниже давления насыщения приводит к выделению газа в призабойной зоне и потере продуктивности скважин по жидкости за счет более высокой мобильности газа и за счет дроссельного охлаждения, что в итоге приводит к снижению дебита скважины.

Диагностические графики анализа добычи NDR

q1o vs RF

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q_{1o} = \frac{\sum Q_o }{ \sum {t_o}}
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RF = \frac{\sum_t Q_o }{V_{STOIIP}}

Yw vs RF 

Рис. 1. График обводненности от КИН

Pe vs RF 

Диагностические графики анализа заводнения WIR

Sample Case

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Fig. 1. Production History Map

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