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Title: Method of deep drilling

Deep drilling is facilitated by the following steps practiced separately or in any combination: (1) Periodically and sequentially fracturing zones adjacent the bottom of the bore hole with a thixotropic fastsetting fluid that is accepted into the fracture to overstress the zone, such fracturing and injection being periodic as a function of the progression of the drill. (2) Casing the bore hole with ductile, pre-annealed casing sections, each of which is run down through the previously set casing and swaged in situ to a diameter large enough to allow the next section to run down through it. (3) Drilling the bore hole using a drill string of a low density alloy and a high density drilling mud so that the drill string is partially floated.
  1. (4616 Ridgeway, Los Alamos, NM 87544)
Publication Date:
OSTI Identifier:
Report Number(s):
US 4483399
DOE Contract Number:
Resource Type:
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
method; deep; drilling; facilitated; following; steps; practiced; separately; combination; periodically; sequentially; fracturing; zones; adjacent; bottom; bore; thixotropic; fastsetting; fluid; accepted; fracture; overstress; zone; injection; periodic; function; progression; drill; casing; ductile; pre-annealed; sections; run; previously; set; swaged; situ; diameter; allow; section; string; density; alloy; mud; partially; floated; drilling mud; drill string; following steps; deep drilling; /166/175/