石油科学（英文版）
石油科學（英文版）
석유과학（영문판）
PETROLEUM SCIENCE
2005年
4期
41-45
,共5页
步玉环%程荣超%王瑞和%曹祥元
步玉環%程榮超%王瑞和%曹祥元
보옥배%정영초%왕서화%조상원
Carbon fiber%set cement%toughness%bending strength%elastic modulus%Poisson's ratio%thin-section analysis
Many measures, such as water injection, acid fracturing, thermal recovery, have been taken in the oilfield development. These can easily induce brittle fracture of set cement. Most of all, there are greater potential for fractures in set cement in slim holes. Therefore, it is necessary to improve the toughness of the cement mantle. Results obtained from experiments show that carbon fiber, with a concentration of 0.12%-0.19% in cement and a length of 700 to 1,400 μm, plays an important role in improving cement quality. Addition of carbon fiber can improve the bending strength of set cement by up to 30%. At the same time, the increase in fiber concentration can lower the elastic modulus and increase the Poisson's ratio of set cement. Thin-section analysis shows that fiber can effectively prevent the propagation of fractures and enhance the plasticity of the matrix and the ability to prevent fracture.
