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RESERVOIR ANALYSIS

TemitopeBello6Follow

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- Interpretation of Formation Pressure Data
- Raw Data Table (With Initial Fluid Interpretation)
- Step 1: Plot the Data • Pressure on the x-axis • Subsea (vertical) depth on the y-axis
- Step 2: Initial Visual Interpretation Initial Interpretation; • 3 Fluids • GOC near 10600 Ft SS • OWC (FWL) near 10700 Ft SS • Unknown fluid at 9626 Ft SS – Not in pressure communication w/ underlying reservoirs ? Gas Oil Water
- Step 3: Initial Quantitative Interpretation Remarks; • Gas gradient look realistic • ?Oil gradient looks too low • Exclude data from 9626 Ft SS Gas Oil
- Step 4: Detailed Look at GOC Remarks; • Initial interpretation has oil zone data points above the gas-oil contact Apparent GOC
- Step 5: Revised Interpretation of Gas-Oil System Remarks; • Oil gradient (density) more realistic that initial interpretation
- Detail of Revised Interpretation Remarks; • Realistic oil gradient But; • Only 2 data points in ?oil column, • Lowest data point at 10673.8 ft SS has very low drawdown mobility (k/u). The resultant apparent pressure and gradient are therefore uncertain. • Apparent gradient should be checked for conformance with other field data GOC 10645
- Feasible – but high water gradient Step 6: Check for Realistic Data Remarks; • Pressure gradient between bottom 2 points is not realistic – far too high • A feasible but very high density water gradient projects into the hydrocarbon zone, • This is not possible if the fluids are in pressure communication
- Step 7: Is the Interpretation Realistic • Are the fluid pressure gradients realistic and consistent with the interpreted fluid • Utilize offset well and regional fluid pressure gradient data • Be prepared to eliminate data from the interpretation; − Remove data points with low drawdown mobility to improve consistency of interpretation, − Eliminate data if there is an apparent pressure discontinuity (data at 9626 ft SS, for example) • Sometimes data cannot be used to determine fluid contacts. For example, the gradient in the assumed water zone is unrealistic. Also, a realistic water gradient plots into a known hydrocarbon zone. • Be prepared to change the interpretation as more data becomes available. For our example no wireline log data or fluid sample data was available.
- Table for Fluid Pressure Gradient Conversion

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