Title:
【発明の名称】溝無し傾斜堀りのための掘穿用流体
Document Type and Number:
Japanese Patent JP2001521560
Kind Code:
A
Abstract:
Disclosed is a composition comprising a water swellable clay, and particularly a sodium montmorillonite clay such as bentonite, sodium carbonate, and a water-soluble biopolymer, and particularly a xanthan biopolymer. The composition when mixed with fresh water forms an aqueous drilling mud having the desirable fluid properties including a high gel strength profile of 10-second/10-minute/30-minute gel and a low API fluid loss for use in trenchless directional drilling including mini-horizontal directional drilling, guided boring, auger boring, pipe jacking, microtunneling, and river crossing. The composition mixed with an aqueous medium provides a water-based drilling mud applicable to trenchless directional drilling in an unconsolidated formation and particularly in an environment contaminated with salty water such as sea water. The composition contains a mixture of about 91 to 98% by weight of Wyoming bentonite, about 1 to 8% by weight of carbonate salt of alkali metal, and about 0.5 to 4% by weight of a selective xanthan biopolymer.
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Inventors:
Liao, W Andrew
Application Number:
JP54192598A
Publication Date:
November 06, 2001
Filing Date:
March 31, 1998
Export Citation:
Assignee:
Dresser Industries, Inc.
International Classes:
C09K8/04; C09K8/20; C09K17/32; (IPC1-7): C09K7/02; C09K17/32
Attorney, Agent or Firm:
Youichi Oshima