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Demzy's Presentation on HDD

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Demzy's Presentation on HDD

  1. 1. A TECHNICAL PRESENTATION HORIZONTAL DIRECTIONAL DRILLING (HDD) TECHNOLOGY GEORGE UDEMEOBONG NTA 0803 512 8478 BY ON
  2. 2. Objective • To enlighten the audience on Horizontal Directional Drilling Technology and how it can contribute towards developing and securing effective pipeline infrastructure in Nigeria.
  3. 3. Some of the Factors affecting development and security of Pipeline Infrastructure in Nigeria • Technology • Technical Expertise • Finance • Vandalization • Comprehensive Pipeline Infrastructure Database • Government and Regulatory Authorities • Social Awareness
  4. 4. Horizontal Directional Drilling Technology Overview • Developed in the early 70’s • Combination of road boring and oil well directional drilling • Lengths up to 3900m • Pipelines up to 56 inch. Diameter • Installation through sand, silts, clays and rock
  5. 5. Directional Drilling Applications • Land to Land Crossing – Rail, Road and River Crossings – Contaminated and environmentally significant areas
  6. 6. Directional Drilling Applications Water to Water crossing Islands crossings Channel Land to water crossing Shore approaches Outfalls
  7. 7. PROCEDURE FOR HDD • INITIAL PLANNING / FEASIBILITY • GEOTECHNICAL REVIEW • ENGINEERING DESIGN • INSTALLATION PROCEDURE • PULL BACK • DEMOBILISATION
  8. 8. INITIAL PLANNING/ FEASIBILITY • Site Investigation • Preliminary Design • Construction Costs • Time scale: - engineering & preparations 3 months, drill hole 2 weeks, pull back 1 day.
  9. 9. Directional Drilling Installation Procedure • Mobilization and Site Preparation • Pre-HDD Activities Installation Procedure • Rig-up • Temporary Casing Installation (If required) • Pilot Hole • Hole Opening Pass • Pullback • De-Mobilization
  10. 10. Site Preparation • Two sites normally required • Rig site 50m x 50m • Pipe side and stringing site • Staged on land and offshore
  11. 11. Typical Drilling Rig Site
  12. 12. Pilot Hole Assembly • Jetting or rock bit • Non-magnetic collars • Survey tool • Non-magnetic collars
  13. 13. DRILL BIT TYPE Mill-tooth Cutter TCI - Cutter
  14. 14. PILOT HOLE PASS • Installation of Para-track Guidance System • Typical Sizes – 8.5” (216 mm) – 12.25” (311.2 mm) • Drill Path Design – Entry Angles: 10 – 18 degrees – Design Vertical Curves: 100 x Outside Diameter (100 x 12) = 1200’ (366 m) – Exit Angles: 6 – 10 degrees. Subject to final design calculations.
  15. 15. Drilling Fluids • Purpose – Cutting medium for jet bits – Drive mud motors – To suspend carry cuttings away from face of drill and out of drilled bore – Provide fill to stabilize bore • Basic Materials – Dry Bentonite (naturally occurring clay) – Fresh water
  16. 16. REAMING-HOLE EXPANSION
  17. 17. FLY CUTTERS & BARREL REAMERS BARREL REAMERS FLY CUTTER
  18. 18. CONVENTIONAL HOLE OPENERS – MILL TOOTH CUTTERS
  19. 19. PULLBACK • Swab Pass(es) • Connection to Carrier Pipe • Rate of Pull • Buoyancy Control
  20. 20. TYPICAL PIPELINE PULLBACK
  21. 21. ENTRY POINT PULLBACK
  22. 22. Project Principles • To assess the feasibility of a HDD project the following basic information is required.  Environmental Considerations  Logistics  Topography  Geology
  23. 23. Project Principles • Environmental Disturbance to the local environment from Drilling Operations. Drilling Fluid discharge risks, control and mitigation. • Logistics  Transport of Equipment.  Support for Drilling Operations.  Movement of Tools.  Disposal of Cuttings and Drilling Fluids.  Movement of Personnel
  24. 24. Project Principles • Topography – Location Plan – Area Plan – Longitudinal Section including levels – Depth of Steams and Rivers • Geology – Evaluation of Existing Documentation – Historical Research – Boreholes – Penetration Tests – Geophysical Tests – Laboratory Tests – Geotechnical Reports
  25. 25. GEOTECHNICAL REVIEW • Number / Depth of Borings • Sieve Analysis Tests • Unconfined Compressive Strength Tests • Rock Quality Designation (RQD)
  26. 26. ENGINEERING DESIGN • Detailed Crossing Profile Design • Operating Stress Calculations • Installation Stress Calculations • Free Stress Minimum Bending Radius • Estimated Fluid Quantity Calculations • Pipeline Buoyancy Analysis
  27. 27. Equipments • Drilling Rig  American Augers DD625  American Augers DD440T  Astec DD3238  MPR 6000 MUD SYSTEM  TULSA IRON 1000 MUD SYSTEM
  28. 28. HDD Landfalls - General Details • Rig located onshore, (can be placed on marine spread offshore). • Drill to exit point from beach entry subject to pipe size and soil conditions. • Engineer coating on pipe-string to give temporary stability during the laying of the string and to have a low friction value when being pulled through the hole. • Pipe-string is preferably pulled directly into the hole either from a laybarge or from a pre-laid position on the seabed.
  29. 29. Offshore Support “Back Reaming” • Support vessel – Locate and survey exit point – Pick-up wash pipe – Stage prereaming operations
  30. 30. Offshore Support Pipeline Pullback • Support vessel – Hold product string – connection for pullback
  31. 31. Intercept Drilling • Concept developed from oilfield technology for tapping into capped wells. • Requirements – Two HDD Maxi Rigs – Insert Casings at each Drill Site. – Drill from one side to within a notional 500m of the opposed rig – Drill from the opposed side to intercept the first drill
  32. 32. HDD Intercept Drilling • Restrictions –Ground Conditions (Rock, Stiff clays) –Depth of Geotechnical Survey –New –Repeatability.
  33. 33. INSTALLATION METHODOLOGY FOR INTERCEPT CROSSINGS • Mobilize Equipment and Personnel to Site. • Survey and re-establish entry and exit co-ordinates. • Set up Equipment at both sides of the River (Rig, mud unit and Steering Tool and wire coils). • Install casing in alignment to entry angles to firm ground bed at both sides. • Drill 2nos Pilot holes into the intersect area, from both sides of the river. • Switch the Guidance system on the shorter crossing to the Passive Magnetic ranging system (PMRS) mode and establish contact between both guidance systems. • Retrieve the short crossing as the longer crossing is steered into the same hole as the shorter crossing, using the PMRS as a homing device to the exit point. • Disconnect both guidance systems. • Connect a reamer and commence the hole expansion process
  34. 34. My Various Site HDD Experiences • 24” X 1.5Km River Niger Crossing At Kwale For Daewoo/NAOC In March Of 2004 Using 300Ton (625,000#) American Augers Rig • 40” X 760M Road & Creek Crossing For Daewoo/SPDC In January 201O Using The 300Ton American Augers Rig. • 18” X 1.3KM Uruan River Crossing at Uruan, Akwa-Ibom State. (swamp) • 18” x 950m Aka-Ibonda River crossing at Creek Town, Cross River state. (swamp) • 18” x 704m Calabar River Crossing at Calabar. (land) • 18” x 650m Itu River Crossing, C.River State. (swamp) • 18” x 550m Esu and Esukudo River crosings, CRS. (swamp) • 18” x 363m Abak river Crossing, Aks. (land)
  35. 35. My Various Site HDD Experiences  30” x 300m Road Xing – Zakhem Constr Ltd (October 2011)  12” x 300m Liverpool River Xing – Oando Plc (September 2011)  Test Pilot Hole Bore, 300m – Oando Plc (August 2011) Installation Period: November 2011  24” X 1.7km Oron River Crossing  24” x 1.2km Uruan River Crossing  24” x 950m Calabar River Crossing  24” x 650m Itu River Crossing  24” x 600m Esu River crossing Client – NIPP/KAZTEC Status– Swamp Site Preparations and Mobilization Installation Period – 2nd Quarter 2012 16”,6” and 4” X 700m Mid-Stream, Bundle Crossing across Commodore Channel Lagos.  Method – HDD, Shore Approach. Client – Oando Plc Status – Engineering and Design Completed
  36. 36. HDD EQUIPMENT & CREW WORKED WITH  RIG – AMERICAN AUGERS DD625 HDD RIG (2004)  CAPABILITY – 300 TON (625,000 LB) PULL BACK CAPABILITY (CAPABLE OF PULLING 3.5KM X 12” P/L)  PUMP/CLEANING SYSTEM – TULSA RIG IRON 10,000 GALLONS MUD CLEANING / RECYCLING SYSTEM  750GPM WEATHERFORD T425 MUD PUMP  6” SYKES TRASH PUMPS (3 NOS).  3KM 6-5/8” FH DRILL PIPES.  VARIOUS SIZES OF FLY CUTTERS/HOLE OPENERS AND BARREL REAMERS Frm 12” to 60”.
  37. 37. HDD EQUIPMENT & CREW WORKED WITH  RIG – AMERICAN AUGERS DD440T HDD RIG (2009)  CAPABILITY – 200 TON (440,000 LB) PULL BACK CAPABILITY (CAPABLE OF PULLING 2.5KM X 12” P/L)  PUMP/CLEANING SYSTEM – MPR 6000 MUD CLEANING / RECYCLING SYSTEM/PUMPING SYSTEM.  200 GALLONS MUD RECYCLING UNIT COMPLETE WITH SHAKERS, DESANDERS AND DESILTERS.  3 NOS 6” SYKES TRASH PUMPS.  2.5KM 5” X 4-1/2 IF DRILL PIPES.  VARIOUS SIZES OF FLY CUTTERS/HOLE OPENERS AND BARREL REAMERS
  38. 38. HDD EQUIPMENT & CREW WORKED WITH  RIG – ASTEC 3238 DIRECTIONAL DRILLING RIG  CAPABILITY – 15 TON (30,000 LB) PULL BACK  PUMP/CLEANING SYSTEM – MX 330 MUD CLEANING / RECYCLING SYSTEM/PUMPING SYSTEM.  2 NOS 4” SYKES SUBMERSIBLE PUMPS.  750M 2-3/8” DRILL PIPES.  VARIOUS SIZES OF FLY CUTTERS/HOLE OPENERS AND BARREL REAMERS
  39. 39. The Benefits of Directional Drilling • Minimum environmental disturbance • No interruption to shipping, road or rail traffic • Accurate installation • Shorter construction schedules • Lower installation costs • Minimal maintenance • Greater protection from external damage
  40. 40. • Requires no concrete coating. • Cheaper alternative to open cut. • Less logistics • Can be buried up to 30mtrs, hence out of the reach of vandals. • Fewer personnel. • Depth of cover add as additional protection to the pipe. • Accurate As-Built Documentation. The Benefits of Directional Drilling cont.
  41. 41. THANK YOU FOR LISTENING

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