Title:
ADDITIVE FOR OIL WELL CEMENT, AND CEMENT COMPOSITION AND CEMENT SLURRY BOTH INCLUDING SAID ADDITIVE FOR OIL WELL CEMENT
Document Type and Number:
WIPO Patent Application WO/2017/195855
Kind Code:
A1
Abstract:
Provided is a PVA-containing additive for oil well cement, the additive having satisfactory performance in preventing the escape of water. Specifically, provided is an additive for oil well cement, the additive containing poly(vinyl alcohol) having a degree of saponification of 75-85 mol% and a viscosity-average polymerization degree of 2,800-4,500. Also provided are: a cement composition which contains the additive for oil well cement in an amount of 0.01-30% bwoc; and a cement slurry which contains the additive for oil well cement in an amount of 0.01-30% bwoc.
Inventors:
TAMAI HIROSHI (JP)
Application Number:
PCT/JP2017/017787
Publication Date:
November 16, 2017
Filing Date:
May 11, 2017
Export Citation:
Assignee:
DENKA COMPANY LTD (JP)
International Classes:
C09K8/44; C04B24/26; C04B28/02; C08F8/12; C08F18/08; C09K8/487
Domestic Patent References:
| WO2007146348A2 | 2007-12-21 | |||
| WO2007146348A2 | 2007-12-21 |
Foreign References:
| JP2002104853A | 2002-04-10 | |||
| JP2008510846A | 2008-04-10 | |||
| JP2015196733A | 2015-11-09 | |||
| US20110042086A1 | 2011-02-24 | |||
| JP2015196733A | 2015-11-09 |
Other References:
See also references of EP 3456796A4
Attorney, Agent or Firm:
WATANABE Kaoru (JP)
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