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    Basic Well Planning checklist

    Successful well planning needs proper collaboration between geoscientist and engineers.Basic consideration to keep in sight before  starting to a well planning:-

    1. Target(s) to be evaluated.
    2. Drilling method to reach the target(s).
    3. Process of evaluation of the target zone(s).

    Given below are few of the points to consider when planning a well:-

    • Lease status of area like ownership,limitation like oil rights down to certain depth/formation, gas rights below to certain level,nearby acreage availability ,well permit ,survey lines,ground elevation,legal well location etc.

    2.Geological and Economical Justification like anticipated pay zone(s),hydrocarbon phase and  expected net to gross .

    3.Detailed description for Each formation  like name, age, depth, thickness, structure , lithology, secondary and exotic minerals if present, porosity and permeability.

    1. Environmental  and local cultural factors like weather, topography, need of  Environmental Impact Statement (EIS), cultural hazards, accessibility and safety  hazards.

    5.Drilling program and plan for drilling straight or slanted or an horizontal well,anticipated total depth (TD) and true vertical depth (TVD),presence of H2S and other gasses,presence of over-pressured zone,casing point,drilling problems like (a) sloughing shales,(b) swelling shales (c) salt beds, (d) faults, (e) high angle beds,  (f) lost circulation zones  like fractures,  excessive mud weight  etc.

    1. Communication channel with  operators and partners.
    2. Data Collection to be done and crew size needed for that like Mud logging  and services   to be provided with mud logging acquisition, number of sets of each type of sample   (wet, dry,     geochemical, palaeontological), pressurized unit,bit dulling plot,   overpressure plot, rate of      penetration (ROP), weight on bit (WOB),   pump pressure (PP),  revolutions per minute (RPM)  and bit data, mud data,   pit volume monitors, special  analysis like ion tracing, radioactive  monitoring, shale densities , hydrogen  sulphide (H2S)  detectors,   ‘Measurement While Logging’, fluid samples, repeat formation test (RFT) and   drill stem test (DST), coring of different types.
    3. Other data to be recorded and person responsible for interpreting it like drilling  records, mudlogs and mudlog records, electric logs, core and/or cuttings (wet and/or  dry),  fluid samples ,Pressure charts, laboratory analyses of cuttings and cores,  biostratigraphic and geochemical     data, fluid properties etc.
    1. For planning a well main source of data comes from nearby  offset wells.Offset well  data to be checked are wireline logs, mudlogs, drilling reports, velocity surveys, bit  records, palaeontology and geochemistry reports, production data.