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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