US 11,753,572 B2
Additive for cement slurry for well and method for producing said additive, cement slurry for well, and cementing method for well
Satoru Murakami, Sodegaura (JP); Masaki Kimata, Sodegaura (JP); and Isao Oota, Sodegaura (JP)
Assigned to NISSAN CHEMICAL CORPORATION, Tokyo (JP)
Appl. No. 17/604,093
Filed by Nissan Chemical Corporation, Tokyo (JP)
PCT Filed Apr. 7, 2020, PCT No. PCT/JP2020/015614
§ 371(c)(1), (2) Date Oct. 15, 2021,
PCT Pub. No. WO2020/217966, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-082615 (JP), filed on Apr. 24, 2019.
Prior Publication US 2022/0220357 A1, Jul. 14, 2022
Int. Cl. C09K 8/48 (2006.01); C04B 14/06 (2006.01); C04B 14/10 (2006.01); C04B 18/02 (2006.01); C04B 28/02 (2006.01); C04B 40/00 (2006.01); E21B 33/14 (2006.01); C04B 103/24 (2006.01); C04B 111/00 (2006.01); C04B 111/40 (2006.01)
CPC C09K 8/48 (2013.01) [C04B 14/06 (2013.01); C04B 14/104 (2013.01); C04B 18/027 (2013.01); C04B 28/02 (2013.01); C04B 40/0039 (2013.01); E21B 33/14 (2013.01); C04B 2103/24 (2013.01); C04B 2111/00706 (2013.01); C04B 2111/40 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An additive for cement slurry for a well, comprising:
an aqueous dispersion of layered silicate; and
silica,
wherein
a solid content concentration of the layered silicate is 0.01 to 5% by mass,
a solid content concentration of the silica is 0.3 to 30% by mass,
a mass ratio of the layered silicate to the silica is 0.01 to 0.1, and
an average particle size of a dispersoid in the aqueous dispersion by laser diffractometry is 0.1 to 30.0 μm.