directional control in longhole drilling
TRANSCRIPT
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Directional Control in Longhole Drilling
Gas and Coal Outburst Committee
Half Day Seminar27 June 2012
Frank Hungerford
Ting Ren
Naj Aziz
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INTRODUCTION
•Directional drilling allows boreholes to be accurately
positioned to provide effective gas drainage
•Ability to steer boreholes allows alternate functions
such as exploration and water management
•Early projects defined drilling and steering
characteristics
•1005m maximum depth
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Vertical Response Lateral Response
- 74 mm Slimdrill DHM
- ¾ degree Bend
- 89 mm Bit
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Steering Guide
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EQUIPMENT DEVELOPMENT
•Availability non-magnetic of high-torque, low speed
Accu-drill DHM
•Increase bit diameter to provide a bigger diameter
borehole to reduce friction – coincidentally standard
HQ open-hole bit diameter of 96.1mm suited
•Increased bend to 1.25 degrees to provide off-set and
steering ability
•Boreholes drilled to 1250 m and 1500 m
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DHM Construction
DHM Bend Off-set
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- 73 mm Accu-dril DHM
- 1.25 degree Bend
- 96 mm Bit
Lateral ResponseVertical Response
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DGS Surveying Configuration – 3m lead
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Survey positions relative to drill bit
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Borehole and Seam profile
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Lateral Deviation
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Vertical Response
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Lateral Response
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Penetration Rate (m/min)
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Feed Pressure
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Planned Borehole
with Roof Intersections
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Borehole and Seam Profile
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Plan- Exploration Borehole
- Previous Borehole
- Defined Structures
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Lateral Deviation Vs Borehole Depth
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Feed Pressure vs Borehole Depth
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Feed Pressure vs Borehole Depth
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Lateral Deviation vs Azimuth
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FUTURE RESEARCH / DEVELOPMENT
•Introduce 6 m survey “lead’ to VLI drilling operations
•Improve data collection in areas of feed pressure, rates
•Produce Response Curves from each drilling project for each
DHM/Bend/Bit configuration
•Assess accumulated friction effects from various steering
practices
•Assess friction effects from overall curve rates and initial off-set
angle of standpipe from Target Azimuth
•Define optimum borehole design and steering practices for
consistent longhole depths
•Define optimum DHM configuration for individual project
requirements
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CONCLUSION
•Understand in-hole friction effects
•Provide optimum drilling practices
•Provide optimum equipment design / configuration
•Enhance driller knowledge and skills
•Improve ability of recovering gear bogged in longholes