Reamers are core components in the reaming process of horizontal directional drilling rigs. In horizontal directional drilling construction, the reamer is the tool that cuts and breaks up the formation and soil along the guided trajectory. Enlarging from the pilot hole to a suitable borehole diameter usually requires multi-stage reaming and multiple trips for hole cleaning. it can be divided into bucket, blade, fly cutter, toothed, and roller reamers based on structural characteristics.
1. Bucket Reamers
The bucket exerts a certain squeezing and wall-stabilizing effect on the borehole wall during the reaming process. The wear-resistant materials welded on the outer surface of the bucket can maintain diameter while also correcting the borehole wall. The back end of the reamer is welded with a large tapered conical surface of tungsten carbide inserts, which is conducive to back reaming in case of borehole collapse.
It can also be divided into general bucket reamers and channeling bucket reamers. The latter adopts a spiral channel groove, which is more conducive to the drainage of mud and cuttings. In addition, there is a blade-bucket reamer, which has the characteristics of large cutting blades of blade reamers, as well as the squeezing, borehole correction, and large buoyancy effects of bucket reamers, with very high bore-enlarging efficiency.
2. Blade Reamers
Its structure adopts large cutting blades for staged reaming. The reaming dimensions range from 480 to 1625 mm, with watercourse diameters of 71 to 76 mm, and blade counts of 12, 20, 24, etc.
3. Fly Cutter Reamers
Fly Cutter Reamers: Use carbide cutting inserts with interchangeable nozzles above. Reaming dimensions are 480-1625 mm, watercourse diameter is 76 mm, and blade counts are 12, 20, 24, etc.
4. Toothed reamers
Toothed reamers have no fixed tooth shapes or bearings. Suitable tooth types and bearing structures should be selected according to different formation structures. Adopting inclined palms and cold alloy wear-resistant design, they have anti-tooth-loss structures to mainly prevent bearing damage and tooth loss, avoiding downhole accidents. They are suitable for horizontal directional drilling construction with high design strength, good wear resistance, long service life, and good safety performance. The reaming dimensions range from 220 to 1600 mm.
Similar to oil drilling bits, it can be divided into milled-tooth and insert-tooth types based on the different gear wheel types of the bit body.
(1)Milled-tooth reamers refer to reamers using milled teeth on the gear wheel body, which have relatively poor wear resistance. Hard alloy layers are often welded on them to improve wear resistance.
(2) Insert-tooth reamers refer to reamers using inserted teeth, with teeth made of hard alloy inserted and fixed into the gear wheel body. This type of tooth has high hardness and good wear resistance, with a long service life. The disadvantage is the brittleness of inserts, which are prone to fracture and dropping out due to loose fixation.
5. Roller reamers
Roller reamers use large-diameter sealed roller cutters with a bearing life of over 100 hours. They have unique multi-stage anti-dropping interlocking devices to prevent decoupling during dry running and roller cutter housing dropping out when bearings are damaged. They also have excellent hydraulic design for smooth cuttings removal and hydraulic rock breaking. The bits are made of high-quality alloy steel and large diameter bits use lightweight design to reduce trajectory deformation. The reaming dimensions range from 400 to 2000 mm.
Choose Vigor as your Roller Reamer manufacturer, please contact us at info@vigorpetroleum.com.
