Customized Drill Solid Carbide
In the process of machining, there are often situations that are difficult to process with standard tools (drills and milling cutters). Therefore, the production of non-standard drills and milling cutters is very important for mechanical cutting.
Therefore, in the process of processing, the material of the drill bit, the size of the cutting edge, the geometric shape, the geometric angle, etc., need to be designed pertinently.
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More and more attention has recently been placed on the study of drill bits that can be used in rotary steerable drilling systems (RSS), which make it possible to design more complex wellbore shapes, including horizontal wells that were previously not effectively drilled using conventional drilling methods. Large displacement well.
Such systems fall into two categories, one of which can be referred to as a "push-the-bit" type and the other of which is a "point-the-bit" type. Regardless of the type chosen, the choice of drill bit must match the RSS system and formation to ensure the most basic three drilling factors: drilling efficiency, steerability, and stability. By ensuring these parameters, directional control, wellbore quality and vibration conditions are optimized.
Focus on hard rock formations
In hard formations, impact damage, thermal damage, and abrasive wear of PDC teeth can limit their performance. It is generally believed that hard rock formations contain rocks of high compressive strength, but in fact, hard formations are only rocks and formations that are difficult to drill. Since drilling operators spend up to 80% of the budget on hard rock drilling footage, which is only 20% of the total drilling footage, it is critical to properly align the drill.
In the past, roller cone bits have dominated the hard rock drilling market because PDC bits cannot effectively overcome the various destructive forces in hard rock formations. Nowadays, with the continuous development of new technologies, PDC drill bits have increasingly replaced roller cone drill bits in hard formation drilling.
Casing drill bit
The casing drill bit helps to reduce the inherent risks in the operation of the casing and liner. Whether the liner and the casing are drilled down through the problem section, either during a one-time operation or after drilling the wellbore in a conventional manner, effective control of, for example, wellbore instability, lost circulation, and energy can be achieved. Challenges such as lowering the casing to the total depth and effectively drilling into the problem section. The use of a full PDC cutting structure on such drills addresses the previously unachievable need to drill or ream in hard formations and drill longer sections.
This casing drill bit unit is available from Hughes Christensen. The company's EZCase unit includes a special alloy crown with a full PDC cutting structure in the crown that allows drilling and casing to be completed downhole at one time, reducing non-drilling time and reducing the need for casing in problematic wells. The risk of the pipe or liner down to the total depth of the bottom of the well. The use of this new type of drilling unit can also successfully complete wells in areas with severe leakage or instability, including in fractured lithotripsy, circulating fluid loss areas, depleted reservoirs, and areas with underground blowouts. In addition, the PDC bit can be drilled through the EZCase unit, eliminating the need for additional grinding operations.
Underbalanced drilling bit
Varel International recently introduced a new type of plain bearing drill that meets the needs of specially designed underbalanced drill bits, such as air, water mixed mist or foam as a circulating medium.
This air-injected plain bearing drill bit features a tungsten carbide insert cutting structure designed for effective drilling into the formation, thorough cleaning of the wellbore and drilling in the most economical way, enabling the drill bit to achieve high mechanical performance under underbalanced drilling conditions. Drilling speed while reducing sliding motion and bit wear.
An important feature of the drill bit is that the special edge shape of the palm tip around the seal area of ​​the drill bit prevents shale buildup and extends bearing life. To protect the seal, a proprietary hard metal weld is applied to the drill bit to the apex edge and the leading edge area of ​​the bit. At the same time, the placement of carbide teeth on the tip of the palm also extends the life of the drill.
Drill bit technology and drilling activities develop simultaneously (2)
New rotary guide