Specific Production Analysis workflow with basic Production Performance Metrics.
Application | Sample Cases |
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First guess on redevelopment opportunities | Natural Depletion Reservoir |
Identify and prioritise surveillance opportunities | Waterflood Sector Analysis |
Assess current production performance: | Oil Producer Analysis |
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Definition
Primary Production Analysis is the specific workflow and report template on Primary Well & Reservoir Performance Indicators.
Application
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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 = CurVRR, Pe
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Background = STOIIP & Structure
Bubbles = Qo, Qg , Qw, Qinj
Number = CumVRR, Pe
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Background = STOIIP & Structure
Bubbles = VRR
Number = Pe / Pem
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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_{LIQ}} |
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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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{\rm GOR} = \frac{q_g}{q_o} |
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{\rm GOR_m} = R_s + \frac{B_o \, \mu_o}{B_g \, \mu_g} \cdot \frac{k_{rg}}{k_{ro}} |
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q_{LIQ} = q_O + q_W |
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PIR
Production Injection Ratio
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{\rm PIR} = \frac{Q_O}{Q_{WI}} |
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{\rm PIR_m} = { \frac{1}{VRR} } \cdot { \frac{1-Y_w}{ Y_w + (1-Y_w) \bigg[ \frac{B_o}{B_w} - \frac{B_g}{B_w}(GOR - R_s) \bigg] } } |
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{\rm J_{O}} = \frac{q_O}{P_e - P_{wf}} {\quad \Rightarrow \quad} P_{wf} = P_e - \frac{1}{J_O} q_O |
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JPI
Total Productivity Index
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{\rm J_t} = \frac{q_t}{P_e - P_{wf}} |
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{\rm J_{tm} } = \frac{2 \pi \sigma}{\ln \frac{r_e}{r_w} +0.5 + S} |
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title | PIR equation deduction |
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VRR = \frac{B_w \, q_{WI}}{B_w \, q_W + B_o \, q_O + B_g \, [ q_G - R_s \, q_O] } = \frac{B_w \, q_{WI}}{B_w \, q_W + B_o \, q_O + B_g \, [ GOR - R_s] q_O } = \frac{B_w \, q_{WI}}{B_w \, q_W + [ B_o + B_g \, ( GOR - R_s) ] \, q_O } |
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VRR = \frac{q_{WI}}{q_W + \bigg[ \frac{B_o}{B_w} + \frac{B_g}{B_w} \, ( GOR - R_s) \bigg] \, q_O } |
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Y_w=\frac{q_W}{q_W + q_O} \rightarrow \frac{q_O}{q_W} = \frac{1-Y_w}{Y_w} \rightarrow q_W = \frac{Y_w}{1-Y_w} \, q_O |
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VRR = \frac{q_{WI}}{q_O} \cdot \frac{1}{\frac{Y_w}{1-Y_w} + \bigg[ \frac{B_o}{B_w} + \frac{B_g}{B_w} \, ( GOR - R_s) \bigg] } =
\frac{q_{WI}}{q_O} \cdot \frac{1-Y_w}{Y_w + (1-Y_w) \, \bigg[ \frac{B_o}{B_w} + \frac{B_g}{B_w} \, ( GOR - R_s) \bigg] } |
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PIR=\frac{q_W}{q_{WI}} = \frac{1}{VRR} \cdot \frac{1-Y_w}{Y_w + (1-Y_w) \, \bigg[ \frac{B_o}{B_w} + \frac{B_g}{B_w} \, ( GOR - R_s) \bigg] } |
Diagnostic
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title | Expand |
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group | sofoil |
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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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Advantages | Limitations |
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Fast Track | Short production forecasts only |
Minimal input data | Sometimes incapable to forecast |
Straightforward analysis | High 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 ]
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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