Cone Bit

roller cone bit

 

As a tool for drilling rock formations, the roller cone bit has been widely used. Significant improvements in bit performance have directly reduced drilling costs, especially in the past decade. The service life and drilling speed are two performance indicators, which ultimately determine the degree to which the drill bit affects the drilling cost.

Improving the drilling speed and service life of the drill bit is an effective way to reduce the drilling cost. It has been confirmed that the improvement of the drilling speed has a greater impact on reducing the drilling cost than the improvement of the drill bit life. The most direct method of drilling speed.

For a long time, the improvement of the cutting structure has been mainly focused on the main cutting tooth structure. For example, in terms of the carbide tooth structure, people have successively invented wedge-shaped teeth, spoon-shaped teeth, partial-top spoon-shaped teeth, etc. People have gradually realized that the gage structure also has a great influence on the ROP and life of the drill bit, especially the drill bits used in highly deviated wells and horizontal wells that require a reasonable gage structure, and many new gage structures have been researched and developed. And applied it to the roller cone bit and achieved good results.

 

What are the uses and classifications of roller cone bits?

The roller cone bit is only suitable for medium and soft formations. It is generally used in shallow and medium formations of oil wells. When drilling into deep layers or oil layers, the drill bit generally needs to be replaced.

Roller cone bits can be divided into single-cone bits, triple cone bits and assembled multi-cone bits according to the number of cones. According to the cutting material, it can be divided into steel teeth (milling teeth) and toothed gear bits.

Steel teeth: The teeth milled on the gear shell have poor wear resistance.

Inlay teeth: The teeth made of hard alloy steel (such as carbon-tungsten alloy) are inlaid on the gear shell. It can drill various rocks from soft to hard. The disadvantage is that the teeth are easy to collapse, break, or the inlay is not strong. And fall.

What are the characteristics of the roller cone bit?

1. Adopting high-strength and high-toughness cemented carbide teeth, which improves the impact resistance of the teeth and reduces the rate of broken teeth;

2. Optimized design of the number of rows of teeth, the number of teeth, the height of the exposed teeth and the unique shape of the alloy teeth give full play to the cutting ability and cutting speed of the drill;

3. The circlip is used to lock the cone, which can withstand high drilling pressure;

4. The inner hole of the cone is welded with anti-friction alloy to improve the anti-occlusion ability of the bearing;

5. Highly saturated nitrile rubber O-ring is used, and the optimized sealing compression improves the reliability of the bearing seal;

6. The all-rubber oil storage bag that can limit the pressure difference and prevent the drilling fluid from entering the lubrication system provides good lubrication for the bearing system and ensures the normal operation of the “O”-shaped sealing ring, which improves the working life of the drill bit;

7. The use of a new type of grease that can withstand high temperatures of 250 ° C and low wear improves the high-temperature resistance of the sealing and lubrication system of the drill bit. It can withstand high drilling pressure when used at conventional speeds.

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