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Bit Selection in Oil Drilling

Bit Selection in Oil Drilling

In the process of drilling, drill bit is the main tool to break rock, and borehole is formed by a drill bit breaking rock. The formation of a well is good or bad, and the length of time it takes is not only related to the rock characteristics of the drilled formation and the performance of the bit itself, but also related to the matching degree between the bit and the formation. The reasonable selection of bit plays an important role in improving the drilling speed and reducing the comprehensive cost of drilling.


The bit is one of the important tools for oil drilling. Whether the bit adapts to the rock property and its quality plays a very important role in the selection of drilling technology, especially in the aspects of drilling quality, drilling speed and drilling cost. PDC bit is a rock breaking tool widely used in the oil and gas exploration and development industry today which effectively improves the mechanical drilling tools and shortens the drilling cycle.


Bit is one of the main drilling equipment. According to the different working environment and regional environment, the specification and shape of bit should also be different. When drilling oil, the bit should be selected reasonably and scientifically based on the specific needs and design scheme.


At present, there are many kinds of bits used in the petroleum industry. According to different drilling methods, the bits can be classified into diamond bits, roller bits and scraper bits. These three kinds of bits are the most basic ones.


Because of the excellent cutting performance of diamond drill bits rock, the diamond bit can drill at high speed and enlarge the drilling depth to a certain extent when being selected as oil drilling tool. In the process of drilling oil with diamond bit, the following aspects need to be paid attention to:


First, the price of diamond bit is relatively high, so we should operate it carefully to reduce the damage degree;


Secondly, the diamond bit has some defects in thermal stability, so the cooling performance and cleaning condition of the bit should be guaranteed when it is used;


Thirdly, its texture is relatively brittle, so the impact resistance of the diamond bit will be relatively poor, so we should strictly follow the relevant rules of the diamond bit to carry out strict and standardized operation.


When selecting a bit as an oil drilling tool, it is necessary to select the bit according to the actual situation of the drilling equipment, the actual conditions of the formation, the geological data of the adjacent oil wells and the formation data. During the selection, the following issues need to be considered:


First of all, we need consider whether there is soft and hard interlacing in the drilling formation;


Secondly, it should consider whether anti deviation drilling and curve operation are needed in the oil drilling work;


Thirdly, the actual depth of different drilling sections in the same well should be considered;


Finally, drilling geology, formation abradability and hardness should be considered.



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