Simulation test device and method for gas channeling of cement slurry under closed annulus condition
By designing a simulation testing device under closed annulus conditions, the problem of simulating the risk of gas channeling in cement slurry under high temperature and high pressure in tailpipe cementing was solved, enabling scientific research on gas channeling factors and improving cementing quality and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA OILFIELD SERVICES LTD
- Filing Date
- 2026-04-24
- Publication Date
- 2026-07-17
AI Technical Summary
Existing gas channeling simulation experimental devices cannot accurately simulate the risk of gas channeling of cement slurry in the closed annulus formed by tailpipe cementing, especially under high temperature and high pressure conditions. They cannot scientifically evaluate the risk of gas channeling, which makes it difficult to guarantee the quality of cementing.
A simulation test device for gas channeling of cement slurry under closed annulus conditions was designed. The device includes an annulus formed by casing, cylinder, top cover and bottom cover. It is divided into a confining pressure cavity and a cement cavity by a piston. Combined with a confining pressure injection unit, a back pressure application unit, a pressure injection unit and a monitoring unit, the device simulates the actual downhole working conditions and monitors the gas channeling phenomenon and filtration loss of cement slurry.
It can accurately simulate the actual downhole working conditions of cement slurry after the tailpipe packer is set, scientifically study the factors affecting gas channeling, improve the reliability of cementing quality, and reduce economic losses.
Smart Images
Figure CN122409355A_ABST