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Drilling program
The document outlines comprehensive well planning and drilling technology, detailing the essential components of a drilling program including well objectives, site preparation, casing design, and mud program. It emphasizes the importance of determining formation pressures, selecting appropriate drilling fluids, and adhering to operational procedures. The summary encapsulates the preparation stages required for effective drilling, encompassing equipment selection and reporting requirements.
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Drilling program
- 1. SECTION 1 :WELL PLANNING BASIC DRILLING TECHNOLOGY AND EQUIPMENT 1 -2 1.2 Drilling Program - Initial Information De ning well objectives • exploration • appraisal • development / production Obtaining Consent • permission from relevant authorities Collection of data • well pressure data, seismic etc. Establish subsurface pressure regimes • differing pressure regimes Establish formation fracture gradients • forecast of fracture gradients or effective casing design Well Plan Basics Porosity • Sedimentary rock has pores (small openings) Permeability • Connected pores allow uid to ow Pore Pressure • Normal, abnormal or subnormal pore uid pressure Rock Stress • Force imposed to the rock Balance • Mud weight must balance pore pressure and rock stress
- 2. SECTION 1 :WELL PLANNING BASIC DRILLING TECHNOLOGY AND EQUIPMENT 1 -3 1.3 Drilling Program Preparation Well Details • location • type • depth • operator / owner • designation • target size and depth • contractor and rig name Well Objectives • to establish objectives at TD Casing Design • conductor • surface casing • intermediate casing • production casing • liners • pressure pro le chart • initial design • setting depth • reservoir uid gradient • casing shoe setting depth • burst, collapse, tension, compressional effects • tensile failure • shock loading • overpull • cement force • position of packer • centralisation • running procedures Well Head Selection • correct pressure rating • ease of operation • cost • operator preferences
- 3. SECTION 1 :WELL PLANNING BASIC DRILLING TECHNOLOGY AND EQUIPMENT 1 -4 BOP Requirements • bottom hole pressures • company policy • stack up con guration Cementing Program • volumes required • bottom hole temperatures • mud type • formation type • stinger technique • liner cementing • yield • density • thickening time • mix water • compressive strength • uid loss • ow characteristics Deviation Program • need for deviation • realistic target needs • extent of drift • kick off point • range of hole angles • abrupt angle changes • jetting techniques • whipstocks Survey Requirements • minimum requirements • totcos • magnetic single shots • magnetic multi shots • electronic multi shots • directional MWD Mud Program • mud weight requirements for primary control • suitable trip margin • con rm mud weight does not exceed formation strength
- 4. SECTION 1 :WELL PLANNING BASIC DRILLING TECHNOLOGY AND EQUIPMENT 1 -5 • reaction of formations to drilling uid alternatives • selection of mud type • uid loss requirements • pH requirements • viscosity • temperature/ stability • analysis of mud treatment equipment Bits and Hydraulic Program • bit selection • formation drillability • mud systems in use • directional implications • bit drive methods • annular velocity • bit and hole cleaning Drill String Design • drill collars • drill pipe • speciality drilling tools • cross-overs Evaluation Requirements • drilling log • mud logging • coring • MWD (measurements while drilling) • electric log • testing • plug and abandon Operational Procedures and Time Graph Construction • company policy • contractor policy • bridging document • time graph Site Plan • license area • position of well relative to other features • obstructions • pipelines
- 5. SECTION 1 :WELL PLANNING BASIC DRILLING TECHNOLOGY AND EQUIPMENT 1 -6 Reporting Requirements • what reports required • frequency • recipients/addresses Completion Equipment • Support Structure • Wellhead • Downhole Completion • Tubing Hanger • Xmas Tree • Flowlines • Control Systems • Manifolds • Production Risers • Surface Production/ Processing Facility • Export Facilities Summary: Drilling Program Preparation: • Well Details • Well Objectives • Casing Design • Wellhead Selection • BOP Requirements • Cementing Program • Deviation Program • Survey Requirements • Mud Program • Bits and Hydraulic Program • Drill String design • Evaluation Requirements • Operational Procedures and Time Graph Construction • Site Plan • Reporting Requirements