File : pdf, 9.5 MB, 74 pages
TOC
1—Introduction
Purpose
Background: St. Louis District
Levee Alteration Process
Increase in HDD Permit Requests
Benefits of HDD Utility Installation
HDD vs Other Forms of Trenchless Technology
Problem Identification
Seepage flow in hydrofracture cracks
Seepage flow through the annular space
Objectives of Study
Benefits of Study
2—Concepts
General HDD Process
Design Drill Path Considerations
Downhole Motors
Functions of Drilling Mud
Drilling Mud Recirculation
Hydrofracture or Inadvertent Returns
Downhole Surveying
Pilot Hole Reaming
Pipe Pullback
Maximum Allowable Annular Pressure
Blockage of Preferred Seepage Paths
3—Details of Field Work
General
Mississippi River Crossing
Wood River Crossing
Geotechnical and Geological Investigation
Topographical survey
Plan and profile of drill path
Allowable Pressures in Annular
Measurements of Drilling Mud Pressure in the Annular Space
Technical Specifications
4—Conclusions and Recommendations
Conclusions
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