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RIG PROCESSES

RIG PROCESSES. Drilling, Coring, Directional Drilling & Survey. Tripping, Wash & Ream, Fishing. E- Logging. Casing & Cementing. Perforating &Testing. Acidizing & Fracturing. Drilling & Coring. Normal Drilling. Coring; Convetional Coring: Core head core barrel. Tripping.

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RIG PROCESSES

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  1. RIG PROCESSES • Drilling, Coring, Directional Drilling & Survey. • Tripping, Wash & Ream, Fishing. • E- Logging. • Casing & Cementing. • Perforating &Testing. • Acidizing & Fracturing.

  2. Drilling & Coring Normal Drilling. Coring; Convetional Coring: Core head core barrel

  3. Tripping ((Pulling out or running the string in hole )) Normal tripping. Tight Hole. Wash and Ream. Normal Drag. Overpull. Twist off. Stuck Fishing

  4. II. Stuck pipe Drilling string cannot be raised, lowered or rotate.

  5. Mechanisms of stuck pipe • Differential Stuck. • Wellbore Geometry. • Hole packing off.

  6. A. Differential Stuck Sticking of pipe against a permeable formation as the result of the pressure of the mud in the hole exceeding the bore fluid pressure.

  7. Differential sticking • Stuck breadth = 4” • Stuck length = 25’ • Fm pressure = 4000 psi • H pressure = 5000 psi • D. F=4*25*12*(5000-4000) • 1,200,000lbs

  8. Key Seat Causes: • Abrupt change in angle or direction in soft formations. • High string tension and pipe rotation wears a slot into the formation. • While POOH the drill collars jam into the slot.

  9. C. Packing Off & Bridging Formation cuttings cavings or medium to large pieces of hard formation, cement or junk settle around the drill string and pack off/bridging the annulus. • Settled cuttings • Shale instability + • Unconsolidated formations • Fractured formations • Cement related. • Junk.

  10. Settled Cutting Straight Hole Causes: • Low annular velocity and/or poor mud properties. • When circulation is stopped, the cuttings fall back down the hole and pack off the drill string.

  11. Settled Cutting Deviated Hole Causes: • Drill cuttings settle on the low side forming a cutting bed. • The cutting bed builds and slide down hole. • While POOH the cuttings is dragged upward by the BHA

  12. ELECTRIC LOGGING Logging While Drilling (MWD). Post Drilling E- Logging. Gamma Resistivity Neutron Density. Sonic.

  13. Resistivity Sonic

  14. CASING Casing is steel pipe placed in an oil or gas well at the end of every drilled phase, and then cemented in place prior to striating drilling the lower smaller hole section.

  15. Function Of Casing Printing hole from caving or collapsing Privinting loss of drilling fluids into weak formations. Isolate troublesome formations. Prevent communication between formations. Provides means of extracting hydrocarbons Provides a means of support for the wellhead equipment.

  16. Centralizers:attached to the casing and since they have a bowed spring arrangement keep the casing centred in the hole after it is lowered in. Centralised casing can make for a better cement job later. Casing Accessories

  17. Scratchers Float collars

  18. Cementing

  19. Well Completion • Completing the well & Setting Production Casing. • Perforating production casing. • Drill Stem Test (DST). • Acidizing. • Fracturing. • Installing the Christmas Tree.

  20. THANK YOU

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