Fixed diameter reamers are used to enlarge the surface large holes in onshore and offshore oil fields, that is, they are used to enlarge the wellbore pre-drilled by roller cone bits, or connected to the bit to complete drilling and reaming operations simultaneously. There are three types of roller cone bits: “SM” type for soft to medium-hard formations; “MH” type for medium-hard to hard formations; and “XH” type for hard formations.
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Downhole variable diameter reamer
A downhole expanding reamer is a tool that expands the wellbore while drilling, saving trips in the drilling process. This reamer is mechanically expanded, and the control of the blade arm opening and closing is convenient in the actual drilling process. It has the advantages of ingenious structure, convenient control and flexible operation.
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Slightly eccentric eye expander
Slightly eccentric reamer, which can be connected to the drill string to achieve while-drilling micro-reaming. The tool has two sets of spiral reaming blades, upper and lower. The lower set is responsible for while-drilling reaming during drilling or positive reaming during tripping, and the upper set is responsible for reverse reaming during tripping.
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