FIELD: construction, particularly directed drilling and compacting means or borehole isolation means used during pipeline laying under river bed.
SUBSTANCE: method involves performing directional pilot well drilling; consolidating well area in instable ground with grouting composition and forming communicational well bore by pilot well reaming. Well area consolidation is carried out by grouting composition injection through at least one pilot well branch. The branch is drilled towards line of pilot well bearing over well bore location in instable ground.
EFFECT: increased communicational well bore stability in instable alluvial ground during technological directional drilling operation along with following stepwise well reaming and provision of trouble-free offshore pipeline installation.
4 cl, 3 dwg
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SU787611A1 |
