| 摘要 |
The present invention is an improved method of installing a flowline below t he surface. The method includes the steps of establishing first and second sigh t relief holes along a linear path, positioning a directional drilling machine on the surface, boring a first portion of a pilot hole from the surface to t he first sight relief hole, determining the elevation of the boring tool and adjusting the boring tool to the desired depth, boring a second portion of t he pilot hole to the second relief hole, and determining the elevation of the boring tool and adjusting the tool to the desired depth. In another aspect o f the invention, a method for directionally boring a flowline is provided. The method includes the steps of establishing a number of sight relief holes alo ng the desired path of the bore, directionally drilling a pilot hole, reaming t he material around the pilot hole to the define a bore wherein the bore is at least partially filled with a slurry of the reamed material, and pulling a pipe into the bore wherein a portion of the slurry is displaced into the sig ht relief holes so that pressure does not develop around the pipe.
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