Well Planning Information Sheet, Well Datasheet, Well Design Information. This is the list of information required by the drilling department to plan and design a well.
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BLOCK / LICENCE
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WELL NAME
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WELL CLASSIFICATION
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PARTNERS (with %'s )
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COMMITMENTS/LICENCE CONSTRAINTS - Spud Date - Completion Date - Other Timing Constraints - Total Depth
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PROPOSED SPUD DATE
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UNITS OF MEASUREMENT - Depth (feet or meters) - Referenced to (MSL, LAT)
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TARGET LOCATION - Seismic line - Shot point - Coordinates UTM
- Surface Location Accuracy - Water Depth - Site Survey
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TARGET SIZE / BOUNDARIES
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OBJECTIVES - Primary Objectives Name Lithology Depth Thickness Type of Fluids Gradient/Gravity H2S / CO2 / Chlorides ( ppm ) Target Tolerance Hole angle constraints
- Secondary Objectives Name Lithology Depth Thickness Type of Fluids Gradient/Gravity H2S / CO2 / Chlorides ( ppm ) Target Tolerance Hole angle constraints |
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GEOLOGICAL SEQUENCE - Geological sequence showing range of possible interval thicknesses and depths, and any uncertainties.
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PRESSURE PROGNOSIS - Include actual reservoir pressure - Potential for overpressure
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FORMATION STRENGTH PROGNOSIS
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TEMPERATURE GRADIENT
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FORMATION DIP - Dip angle and direction for all intervals
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TOTAL DEPTH - Definition (e.g. 20 ft into basement) - TD core required
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CORING REQUIREMENTS - Coring Policy (on shows etc ) - Possible cored intervals - Estimated No. and thickness of cores - Restrictions on core size - Special requirements (oriented core, fibre glass inner barrels, low invasion system, etc.)
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SAMPLING REQUIREMENTS
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ELECTRIC LOGGING REQUIREMENTS - Top Hole Section” Logs required Optional logs No. of runs Estimated duration
- Intermediate Hole Section Logs required Optional logs No. of runs Estimated duration
- Reservoir Hole Section Logs required Optional logs No. of runs Estimated duration
- Cased hole logging Logs required Estimated duration
- Hole size restrictions / preferences - Constraints on drilling mud properties - Rathole req'd below last depth of interest - Log Data Transmission Requirements
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VSP REQUIREMENTS - Type of survey ( VSP / check shot ) - Estimated duration - Special requirements
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TESTING REQUIREMENTS - Type of test - Testing Policy / Objectives - Hole / csg size restrictions / preferences - Est. No. and duration of tests (AFE ) - Possible stimulation ( acidise, frac ) - Testing fluid - Drilling mud tracer requirements - Depth correlation markers in casing - Wellhead / Tree requirements - Flaring requirements - Rathole required below test interval
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POTENTIAL DRILLING PROBLEMS - Surface gas (Shallow seismic ) - Overpressure - High Temperatures - H2S & CO2 - Hole stability (Reactive shales,….) - Abrasive formations - Faulting - Hard stringers ( chert, quartzite, etc ) - Restrictions on bit types ( PDC )
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DISCOVERY / APPRAISAL DRILLING Sidetracking Option Additional well(s) Wellhead / Tree heights Abandonment/Suspension Procedures
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OFFSET WELLS The following list is required (useful) for each offset well: - Mud logs - Composite logs - Pressure detection logs and tests - Drilling completion reports - Daily drilling reports - Daily geological reports - Any drilling related reports, mud recaps, IADC reports etc
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