Horizontal Directional Drilling
Horizontal Directional Drilling
(OP)
Has anyone had experience with stabilizing the area outside the directional drilled pipe. The normal drilling mud is documented as providing little to no support to the pipe. Therefore, it is hard to make ring deflection calculations work for normal pipe design. I was wondering if an acceptable prcatice is to pressure grout around the exterior of the pipe after it is in place. Or maybe add a late setting cement or grout to the drilling mud which would stabilize the soil directly outside the pipe. Anyone else encountered this problem?





RE: Horizontal Directional Drilling
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying " Damn that was fun!" - Unknown>>
RE: Horizontal Directional Drilling
unless I'm very wrong you are talking about a different application than SJCivil. I believe you are discussing a directionally (vertically) drilled well whereas the topic is regading a horizontally directionally drilled pipeline. The pipeline is a permanent installation that SJCivil is concerned will be affected by the continued prescence of the driling fluid
RE: Horizontal Directional Drilling
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying " Damn that was fun!" - Unknown>>
RE: Horizontal Directional Drilling
"Stabilizing the bore path, especially in loose or soft soils, by building a low-permeability filter cake and exerting a positive hydrostatic pressure against the bore path wall. The filter cake and positive hydrostatic pressure reduce obstruction of the bore path and prevent formation fluids (i.e., groundwater) from flowing into the bore, or drilling fluids from exiting the bore path into the formation (loss of circulation)."
http://www.dipra.org/pdf/HDD-brochure.pdf