US 11,866,367 B2
Oil well cement composite permeation enhancement agent suitable for hydrate layer and preparation method
Chang Lu, Qingdao (CN); Huajie Liu, Qingdao (CN); Shenglai Guo, Qingdao (CN); Yuhuan Bu, Qingdao (CN); Changyou Xiang, Qingdao (CN); Qiang Wang, Qingdao (CN); and Xinyang Guo, Qingdao (CN)
Assigned to CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Qingdao (CN)
Filed by CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Qingdao (CN)
Filed on Feb. 15, 2023, as Appl. No. 18/109,859.
Claims priority of application No. 202210490142.5 (CN), filed on May 7, 2022.
Prior Publication US 2023/0357080 A1, Nov. 9, 2023
Int. Cl. C09K 8/02 (2006.01); C04B 16/06 (2006.01); C04B 16/08 (2006.01); C04B 40/00 (2006.01); C04B 111/00 (2006.01)
CPC C04B 16/0633 (2013.01) [C04B 16/085 (2013.01); C04B 40/0039 (2013.01); C04B 2111/00284 (2013.01)] 7 Claims
 
1. An oil well cement composite permeation enhancement agent for a hydrate layer, wherein, in parts by weight, a composition of raw materials of the oil well cement composite permeation enhancement agent is 4.6 parts-5.0 parts of kerosene, 0.23 parts-0.25 parts of an emulsifier, 0.8 parts-1.1 parts of a surface-modified polypropylene fiber, 10.0 parts-12.0 parts of porous and permeable microspheres, 1.0 part-1.2 parts of paraffin, and 57.5 parts-62.5 parts of water;
wherein a length of the surface-modified polypropylene fiber is 5 mm-6 mm, a diameter of each of the porous and permeable microspheres is 0.27 mm-0.55 mm, and an aperture of each of the porous and permeable microspheres is 0.15 mm-0.25 mm;
a specific preparation process of the surface-modified polypropylene fiber is as follows: first, swelling a polypropylene fiber with a xylene for 60 min-80 min, then taking it out and filtering to dry to obtain a first resulting fiber; soaking the first resulting fiber in an acetone solution for 3 h-4 h, then washing with a distilled water and drying in an air to obtain a second resulting fiber; followed by soaking the second resulting fiber with a silane coupling agent with a concentration of 50% for 120 min to modify and optimize a surface of the polypropylene fiber to obtain a third resulting fiber; after a modification is completed, washing the third resulting fiber to be neutral with the distilled water and drying to obtain the surface-modified polypropylene fiber; finally, blowing the surface-modified polypropylene fiber into a root shape with an air gun and packing for a set aside.