Title:
【発明の名称】掘削泥水用添加剤
Document Type and Number:
Japanese Patent JP2587480
Kind Code:
B2
Abstract:
Drilling fluid additives which are able to display the properties of drilling fluid constantly regardless of presence or absence of salts, composed of water-soluble copolymer ( A ) having average molecular weight of 1,000 SIMILAR 50,000, which are led from monomer components composed of a monomer ( I ) of 40 SIMILAR 99.5 molar percentages in a series of unsaturated carboxylic acids, as shown in the following general formula ( I ), and an unsaturated monomer ( II ) of 0.5 SIMILAR 60 molar percentages in a series of ( meth )allylethers, as shown in the general formula ( II ). In the formula ( I ), each of A<1> and A<2> independently represents hydrogen, methyl, or -COOX<2>, and A<1> and A<2> are not -C00X<2> at the same time. A<3> represents hydrogen, methyl, or -CH2COOX<3> and, in a case that A<3> is -CH2C00X<3>, each of A<1> and A<2> independently represents hydrogen or methyl. Each of X<1>, X<2>, and X<3>, independently or at the same time represents hydrogen, monovalent metal, divalent metal, ammonium, or organic amine. In the formula ( II ) R<1> represents hydrogen or methyl , and Z represents hydroxyl; a sulfonic acid group or its monovalent metal salt, divalent metal salt, ammonium salt, and organic amine salt; a phosphoric ( or phosphorous ) acid group or its monovalent metal salt, divalent metal salt, ammonium salt, and organic amine salt.
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Inventors:
SHIOJI NAOTAKE
IRIE YOSHIO
FUJIWARA TERUAKI
IRIE YOSHIO
FUJIWARA TERUAKI
Application Number:
JP28126288A
Publication Date:
March 05, 1997
Filing Date:
November 09, 1988
Export Citation:
Assignee:
NIPPON CATALYTIC CHEM IND
International Classes:
E21B21/00; C08F220/04; C09K8/04; C09K8/24; (IPC1-7): C09K7/02; E21B21/00
Domestic Patent References:
| JP57143386A |