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lesson 10 flow drilling mudcap drilling snub drilling closed systems read: udm chapter 2.8-2.11

Flow Drilling. Flow drilling refers to drilling operations in which the well is allowed to flow to surface while drilling.All UBD operations are really flow drilling operations, but the term is usually applied to drilling with a single phase mud, and no gas is injected except by the formation.. Harold Vance Department of Petroleum Engineering.

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lesson 10 flow drilling mudcap drilling snub drilling closed systems read: udm chapter 2.8-2.11

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    1. Lesson 10 Flow Drilling Mudcap Drilling Snub Drilling Closed Systems Read: UDM Chapter 2.8-2.11 Pages 2.180-2.219

    2. Flow Drilling Flow drilling refers to drilling operations in which the well is allowed to flow to surface while drilling. All UBD operations are really flow drilling operations, but the term is usually applied to drilling with a single phase mud, and no gas is injected except by the formation.

    4. Drilling Fluid Selection Density is determined by: Maximum pressure = to formation pressure. Minimum pressure dictated by wellbore stability. Pressure limitations of diverter and BOP equipment.

    5. Surface Equipment

    11. Sizing Flare Line

    12. Sizing Flare Line

    13. Sizing Flare Line

    14. Sizing Flare Line

    16. Sizing Flare Line

    17. Sizing Flare Line

    18. Surface Pits Primary oil separation pit. Secondary oil separation pit. Skimmer system safety. Drilling fluid pit. Oil transfer tank.

    19. Operating Procedures Mechanical objectives during flow drilling are: To control the well. Minimize differential sticking problems. Minimize drilling fluids losses. Maximum tolerable surfaces pressures should be established before drilling starts.

    20. Mudcap Drilling Utilized with uncontrollable loss of circulation during flowdrilling operations. Higher pressures than can be safely handled with the rotating head or RBOP. It is not strictly an underbalanced drilling technique.

    21. Driller loads the annulus with a relatively high density high viscosity mud and closes the choke with surface pressure maintained. Drilling is then continued “blind” by pumping a clear non-damaging fluid down the drillstring through the bit and into the thief zone. Mudcap Drilling

    22. Applications: Sustained surface pressures in excess of 2,000 psi. Sour oil and gas production. Small diameter wellbores. Mudcap Drilling

    23. Mudcap Drilling

    25. Determining Pore Pressure

    26. Static Standpipe Pressures

    27. Example

    28. Dynamic Standpipe Pressures

    29. Example

    30. Example

    31. Example

    32. Fluid Volume Requirements

    33. Fluid Volume Requirements

    34. Fluid Volume Requirements

    35. Annular volumes will depend upon whether the operator desires continuous or periodic injection of annular fluids or whether a floating mudcap is to be used. Fluid Volume Requirements

    36. Fluid Volume Requirements

    37. Fluid Volume Requirements

    38. Example

    39. Snub Drilling UBD operation utilizing a snubbing unit or coiled tubing unit. Expense is justifiable if very high formation pressures are anticipated, and uncontrollable loss of circulation is expected.

    45. Closed Systems Refers to UBD operations with a specific surface system. A pressurized, four phase separator and a fully closed surface system, is used to handle the returned fluids.

    50. Other Surface Equipment Cuttings filter. Heater. Degasser. Flare stack/pit. Production tank. Water tank. Solids tank. Instrumentation.

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