Tungsten Carbide Nozzle Used for Oil Drilling

With the development of the oil industry and increasing energy demands, the oil drilling related technology has been developing constantly. In the early years, oil drilling mainly uses impact drilling by human, mechanical drilling and rotary drilling, etc., and at a selected location down or side surface drilled to a diameter of the cylindrical bore underground reservoirs. These types of high-pressure pneumatic drill, DTH drill and cone drill can be used with tungsten carbide buttons to improve the drilling efficiency and extend the service life of the drill. Now the researchers through studying deeply and find a kind of more effective technology that high-pressure abrasive water jet technology for the deep and edge reservoirs exploiting. High pressure abrasive water jet takes high-pressure water as the carrier, adds a certain amount of abrasive particles to greatly enhance the impacting force and the rock formation cutting efficiency also be remarkably improved. So it has a broader application prospect.

Tungsten carbide nozzle plays an important role in high pressure abrasive water jet. It has high hardness, high strength and excellent wear and corrosion resistance. Generally, oil drilling process is always under a high confining pressure environment, so the nozzle needs to withstand the high-speed impact of high pressure grinding compound and it will be wore and failure easily. Such this situation, common materials like steel nozzle will be prone to thermal deformation or be cracked, which needs to change the nozzles frequently and the drilling efficiency decreased. Especially it is extremely inconvenient that remove and replace the drill bit in deep drilling. In addition, to mount tungsten carbide material in the parts most likely to be worn is also a kind of method to improve the properties and extend the service life of nozzle. Furthermore, in the manufacturing process of tungsten carbide nozzle, it can improve the hardness and wear and corrosion resistance further by decreasing the granularity of WC grains based on no reducing the material toughness.

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