Planning Horizontal Directional Drilling for Pipeline Construction

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In addition to having an EPP, it is essential to have qualified people onsite to enact the plan, to handle deviations to the plan and to report events properly to the authorities. Having an environmental specialist or biologist onsite to liaise directly with the DFO habitat biologist or other similar authority can prove useful. Effective communication of unintended events and subsequent mitigation actions to the authorities may reduce delays or unwarranted enforcement actions contingency planning, e.g., inadvertent returns, (see also Section 10.3.2); and reclamation. September 2004 Planning Horizontal Directional Drilling for Pipeline Construction Page 9-6
10 CONSTRUCTION CONSIDERATIONS 10.1 Drilling 10.1.1 Types and Sizes of Rigs The size of HDD rigs can vary substantially. This range in sizes should be considered when planning and developing specifications for an HDD project. In general, rigs are sized according to their available pull force and rotary torque that can be applied to the drill stem and pipe string. The following are samples of rig sizes and the respective ranges of projects that can be completed. Rig Torque Length of Drill Diameter of Pipe 0 – 54,000 Nm up to 200 m up to 168.3 mm 54,000 – 108,500 Nm up to 400 m up to 273.1 mm 108,500 – 217,000 Nm up to 500 m up to 323.9 mm 217,000+ Nm over 500 m over 323.9 mm Note: Nm = Newton metres The capabilities of each rig should be assessed for each project. The assessment of rig capabilities should take into account the possibility that formations or other subsurface materials may be encountered that could cause difficulties with the HDD project. 10.1.2 Casing Considerations related to casing are discussed in Section 8.3. 10.1.3 Drag Section The pipe installation should be designed so that, wherever possible, the pipe string or drag section can be laid out and pulled back in one continuous section. The pipe will have to be lifted into place to match the exit angle of the drill to allow the drill rig to pull the section into place. The pipe string is usually placed on rollers as it is pulled into the drilled hole. The drag section may be cradled through a vertical curve to achieve the proper angle at the exit point. This curvature should be no more than the limiting curvature of the pipe. September 2004 Planning Horizontal Directional Drilling for Pipeline Construction Page 10-1
Page 1 and 2: GUIDELINE Planning Horizontal Direc
Page 3 and 4: OVERVIEW Horizontal Directionally D
Page 5 and 6: 6.1.2 Clays and Shales ............
Page 7 and 8: E.4 Drill Continuance Plan.........
Page 9 and 10: 1 INTRODUCTION Horizontal direction
Page 11 and 12: Figure 1 Watercourse Crossing - Hor
Page 13 and 14: An internal inspection of the pipe
Page 15 and 16: 2 REGULATORY AND INFORMATION REQUIR
Page 17 and 18: • the bed, if disturbed, must be
Page 19 and 20: 3 SELECTION OF HDD AS THE PREFERRED
Page 21 and 22: Sediment and erosion control protec
Page 23 and 24: 4 RISK CONSIDERATIONS As with all c
Page 25 and 26: Potential HDD Difficulty Constructi
Page 27 and 28: 5.3 Direct Costs and Benefits of HD
Page 29 and 30: during directional drilling. Conver
Page 31 and 32: to be provided to prospective HDD c
Page 33 and 34: complement to, bore hole investigat
Page 35 and 36: exit area for pipe stringing, weldi
Page 37 and 38: • interruption of fish movements
Page 39 and 40: 8 ENGINEERING DESIGN CONSIDERATIONS
Page 41 and 42: • landowner consultation during t
Page 43 and 44: Conventional two-layer extruded pol
Page 45 and 46: 9 CONTRACTUAL CONSIDERATIONS 9.1 Ty
Page 47 and 48: 9.2.5 Equipment The bid documents s
Page 49: • inability to prevent excessive
Page 53 and 54: • plugging and sealing capabiliti
Page 55 and 56: the drill path should be aligned to
Page 57 and 58: 10.3.4 Clean-up and Remediation An
Page 59 and 60: Equipment Use Frac tanks • for ab
Page 61 and 62: Directional Crossing Contractors As
Page 63 and 64: APPENDICES September 2004 Planning
Page 65 and 66: Appendix A - Glossary annular press
Page 67 and 68: adius of curvature the bend radius
Page 69 and 70: Appendix B - Primary Regulatory and
Page 71 and 72: Jurisdiction Agency Purpose Northwe
Page 73 and 74: Appendix C Example Drilling Executi
Page 75 and 76: d) disposal plan composed of: i) an
Page 77 and 78: Appendix D - HDD Related Conversion
Page 79 and 80: Appendix E - Example (Alberta) - Pi
Page 81 and 82: 4. The drilling mud must be cleaned

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