Methods and cement compositions utilizing treated polyolefin fibers

摘要

Methods and cement compositions are provided that utilize treated polyolefin fibers for lost circulation and/or mechanical property enhancement. Disclosed is a method comprising: providing a cement composition comprising: a hydraulic cement; water; and treated polyolefin fibers that are rod-shaped and have a length in a range from about 0.0625 inches to about 0.25 inches, wherein the treated polyolefin fibers have been treated with a surfactant to make the treated polyolefin fibers hydrophilic; placing the cement composition in a selected location; and allowing the cement composition to set.

主权项

1. A method of preventing lost circulation in a well bore comprising:
preparing a dry blend comprising: fibers consisting of treated polyolefin fibers; and a hydraulic cement; wherein the treated polyolefin fibers are non-fibrillated, rod-shaped and have a length in a range from about 0.0625 inches to about 0.1825 inches, wherein the treated polyolefin fibers have a mean diameter of from about 0.00034 inches to about 0.00090 inches and a denier in a range of from about 7 to about 10, wherein the treated polyolefin fibers comprise polyolefin fibers that have been treated with a surfactant to make the treated polyolefin fibers hydrophilic; preparing a cement composition comprising the dry blend and water, wherein the cement composition is non-foamed, wherein the treated polyolefin fibers are included in the non-foamed cement composition to prevent lost circulation, wherein the water is present in an amount of about 100% to about 200% by weight of the hydraulic cement; placing the cement composition in a well bore, wherein the treated polyolefin fibers reduce loss of fluid circulation of the non-foamed cement composition and/or any subsequently introduced fluids; and allowing the cement composition to set in the well bore.