Title:
ADDITIVE FOR OIL WELL CEMENT AND OIL WELL SLURRY USING THE ADDITIVE FOR OIL WELL CEMENT
Document Type and Number:
Japanese Patent JP2022027773
Kind Code:
A
Abstract:
To provide an additive for oil well cements that contains a vinyl alcohol polymer and exhibits good fluid loss reduction performance.SOLUTION: An additive for oil well cements contains a vinyl alcohol copolymer that is a saponified product of a copolymer of a vinyl ester monomer with a multifunctional monomer, and has a saponification degree of 70-95 mol% and a viscosity-average degree of polymerization of 1000-10000.SELECTED DRAWING: None
Inventors:
YAMASHITA AKIHIRO
WATANABE KOSUKE
WATANABE KOSUKE
Application Number:
JP2021187384A
Publication Date:
February 14, 2022
Filing Date:
November 17, 2021
Export Citation:
Assignee:
DENKA CO LTD
International Classes:
C04B24/26; C04B24/12; C04B28/02; C08F8/12; C08F216/06; C08F218/04; C09K8/12; C09K8/44; E21B33/13; E21B43/00
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| JP2016079308A | 2016-05-16 | |||
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Foreign References:
| WO2017195855A1 | 2017-11-16 | |||
| WO2014171502A1 | 2014-10-23 | |||
| WO2017099082A1 | 2017-06-15 |
Attorney, Agent or Firm:
Axis International Patent Business Corporation