Reaming Technology and Its Applications
Sidetracking Well Reaming Technology
As oilfield development enters the middle and late stages, the number of wells idled for extended periods due to various reasons is increasing. Using sidetracking as an alternative to regeneration or adjustment wells has gained widespread favor among oil companies due to its advantages of low investment and rapid effectiveness. However, over time, the short lifespan of sidetracking wells completed using conventional technology has gradually become apparent.According to statistics, the average lifespan of sidetracking wells with 7" casing is only about two years, and that of sidetracking wells with 5.5" casing is only about one year, far shorter than the lifespan of typical production wells, which severely impacting the development of sidetracking technology.
The main reasons for the short life of sidetracked wells include:
Small annular clearance
Uncentered liner
Poor cementing quality
Since 2000, through theoretical research and field testing, a series of reaming technologies have been
developed. This has increased the annular clearance of sidetracked wells to 20-26mm, tripling the average
lifespan and resolving the bottleneck that has restricted the promotion of sidetracked wells.
Sidetracking small wellbore reaming tool
Features of Micro-Stepped Underreamer:
1, Simple and reasonable structure, can be directly connected to the drill pipe without additional crossover subs.
2,Stable and reliable during downhole operations; equipped with an automatic closing device, ensuring smooth opening and closing of blades.
3,The tool has a strong ability to penetrate complex interlayers and is suitable for various soft and hard formations.
4, Adjustable reaming diameter to meet the requirements of different hole sizes.
Reaming tool series
Underreaming technology has been gradually extended to CBM (coalbed methane), expandable tubulars, casing valve installation, underground gas storage projects, and deep well casing running,
forming a series of mature and diversified underreaming techniques.
Application Scope:
1, Underreaming in CBM wells (threading through narrow boreholes)
2, Underreaming in complex formations (salt, swelling, and creeping formations)
3, Large-diameter underreaming in underground gas storage projects (to improve cementing quality)
4, Auxiliary underreaming for expandable tubulars and corrugated pipes in leakage sealing
5, Underreaming in horizontal wells (for gravel packing and sand control completions)
Hydraulic opening mechanical locking type reaming tool
Advantages:
1. The tool automatically locks after opening, unaffected by drilling fluid flow, ensuring stable reaming diameter and long service life.
2. Suitable for reaming in hard formations and long openhole sections.
