Title:
MUD FOR SHIELDING PROCESS
Document Type and Number:
Japanese Patent JP3169391
Kind Code:
B2
Abstract:
PURPOSE: To keep a sealing effect by applying for a high water permeable stratum like a sand layer, by adding a mud slurry composed of specified-formed spherical particles or crushed polymer to a water solvent in order to increase the viscosity.
CONSTITUTION: Spherical or crushed polymer of 100 pts.wt. like water-absorptive and bridge-formed polyacrylic acid is mixed with a reversed-phase emulsion type water soluble agent of 100-500 pts.wt. such as a polymer like polyvinyl alcohol for instance for increasing the viscosity to produce a mud slurry used for a shielding process. This mud of 0.5-1.5 pts.wt. is added into a fresh water solvent of 100 pts.wt. for instance to make a viscous mud slurry which is poured into the working face. A good cutting-off effect of water can be obtained even in a high water permeable stratum. Or it can keep a sealing effect in a high water permeable stratum like a sand layer or a conglomerate layer.
Inventors:
Katsuhisa Abe
Togashi Kaoru
Togashi Kaoru
Application Number:
JP14147591A
Publication Date:
May 21, 2001
Filing Date:
May 17, 1991
Export Citation:
Assignee:
Tell Night Co., Ltd.
International Classes:
E21D9/13; C09K8/02; C09K8/04; E21D9/06; (IPC1-7): E21D9/06; C09K7/02
Domestic Patent References:
| JP62267389A | ||||
| JP5575483A | ||||
| JP6465186A | ||||
| JP337290A |
Attorney, Agent or Firm:
Okuyama Shoichi (5 people outside)
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