A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Variable-density foam cement slurry well cementation method and well completion structure
The invention provides a variable-density foam cement slurry well cementation method and a well completion structure, and belongs to the technical field of oil exploration. The well completion structure comprises an oil and gas well borehole and a casing pipe, an annulus is formed between the oil and gas well borehole and the casing pipe, and a cement sheath and a foam cement sheath are arranged on the horizontal section of the annulus at intervals in the well depth direction. By reducing the elastic modulus and the strength of the cement sheath between the casing and the stratum, when shear sliding displacement occurs on the stratum fracture surface, the low elastic modulus and the low strength of the foam cement sheath form a buffering effect between the stratum and the casing, so that the load acting on the casing is reduced, and the deformation of the casing is prevented or reduced; the section losing and well abandoning risks caused by casing deformation are reduced, and the oil and gas exploitation efficiency is improved.
本发明提供了一种变密度泡沫水泥浆固井方法及完井结构，属于石油勘探技术领域。所述完井结构包括油气井井眼和套管，油气井井眼和套管之间形成环空，所述环空的水平段沿着井深方向间隔设置有水泥环和泡沫水泥环。本发明通过降低套管与地层之间水泥环的弹性模量和强度，在地层裂缝面发生剪切滑动位移时，泡沫水泥环的低弹模低强度在地层与套管之间形成缓冲作用，降低作用在套管上的载荷，防止或降低套管变形，降低了套管变形引起的丢段和弃井风险，提高油气开采效率。
Variable-density foam cement slurry well cementation method and well completion structure
The invention provides a variable-density foam cement slurry well cementation method and a well completion structure, and belongs to the technical field of oil exploration. The well completion structure comprises an oil and gas well borehole and a casing pipe, an annulus is formed between the oil and gas well borehole and the casing pipe, and a cement sheath and a foam cement sheath are arranged on the horizontal section of the annulus at intervals in the well depth direction. By reducing the elastic modulus and the strength of the cement sheath between the casing and the stratum, when shear sliding displacement occurs on the stratum fracture surface, the low elastic modulus and the low strength of the foam cement sheath form a buffering effect between the stratum and the casing, so that the load acting on the casing is reduced, and the deformation of the casing is prevented or reduced; the section losing and well abandoning risks caused by casing deformation are reduced, and the oil and gas exploitation efficiency is improved.
本发明提供了一种变密度泡沫水泥浆固井方法及完井结构，属于石油勘探技术领域。所述完井结构包括油气井井眼和套管，油气井井眼和套管之间形成环空，所述环空的水平段沿着井深方向间隔设置有水泥环和泡沫水泥环。本发明通过降低套管与地层之间水泥环的弹性模量和强度，在地层裂缝面发生剪切滑动位移时，泡沫水泥环的低弹模低强度在地层与套管之间形成缓冲作用，降低作用在套管上的载荷，防止或降低套管变形，降低了套管变形引起的丢段和弃井风险，提高油气开采效率。
Variable-density foam cement slurry well cementation method and well completion structure
一种变密度泡沫水泥浆固井方法及完井结构
LIU KUI (author) / CHU YONGTAO (author) / WANG MU (author) / DING SHIDONG (author) / XIAO JINGNAN (author) / LI HE (author) / LU PEIQING (author) / LIU LUO (author)
2024-12-13
Patent
Electronic Resource
Chinese
Well cementation cement slurry composition and well cementation cement slurry
| European Patent Office | 2022
| European Patent Office | 2023