Patent ID: 11866367
Assignee: CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 3:
4. A method for a preparation of the oil well cement composite permeation enhancement agent for the hydrate layer according to claim 1, comprising specific steps of:
(1) mixing the distilled water with the emulsifier and stirring well, then adding with the kerosene and stirring at a high speed to obtain an emulsion;
(2) heating the paraffin to be a liquid paraffin and immersing hollow porous and permeable microspheres into the liquid paraffin, followed by placing in an open container;
placing the open container in a vacuum chamber, conducting a vacuuming under a negative pressure, wherein a temperature of the vacuum chamber is higher than a melting point of the paraffin; then, refrigerating the hollow porous and permeable microspheres until the liquid paraffin becomes a solid paraffin; wherein the paraffin is stored in a center of the hollow porous and permeable microspheres in a solid form, and paraffin-bearing microspheres are obtained;
(3) adding the surface-modified polypropylene fiber into the emulsion and adding the paraffin-bearing microspheres while stirring to obtain the oil well cement composite permeation enhancement agent.