Hot pressed and diamond impregnated drill tooth applicable to strong abrasive hard formation

Abstract

The invention provides a hot pressed and diamond impregnated drill tooth applicable to a strong abrasive hard formation, which consists of a composite matrix and a natural diamond and is composed by a hot pressing and sintering process, wherein the composite matrix consists of 25-43% of WC (wolfram carbide), 15-25% of casting WC, 15-30% of Cu, 13-20% of Co, 11-17% of Ni, 1-3% of Mn, 1-2% of P and 0.5-1% of artificial single-crystal diamond powder; the natural diamond is a titanium coated natural diamond, the particle size range is 40-100 meshes, and the concentration is 75-110%; and the drill tooth is cylindrical. The drill tooth provided by the invention can be inlaid on a bit matrix in the vertical and horizontal ways and has cutting and grinding combined functions for rock breaking in the soft and hard interlaced and abrasive formation, high rock breaking efficiency and long service life.

Description

technical field [0001] The invention relates to a rock-breaking tool for oil drilling, in particular to a hot-press impregnated diamond drill tooth for a diamond drill bit. Background technique [0002] With the continuous improvement of exploration level, shallow and easy-to-develop oil and gas resources have gradually decreased, and it is imperative to develop oil and gas resources in deep formations. The drilling of deep and ultra-deep wells often encounters sandstone, granite and other strong abrasive hard formations. In the past, roller cone bits, PDC bits and diamond bits were often used in drilling such formations. However, the rock-breaking efficiency of the roller cone bit is low, the footage of a single bit is small, and it is prone to downhole accidents such as the loss of the cone; the PDC bit wears fast and is difficult to eat; the diamond bit also has the problems of slow drilling speed and short life. , seriously restricting the speed of oil and gas explorati...

AI Technical Summary

Problems solved by technology

The way to improve the performance of this type of drill bit is to reasonably design the diamond parameters. There is a set of reasonable diamond parameters corresponding to the formations with different characteristics. For example, when drilling into hard and abrasive formations, it is required to use magnetic separation, high-grade, fine-grained and High-concentration diamond, the specific parameters are calculated by theory to ensure the efficient rock breaking and long life of the drill bit, but there is a significant problem in this method: natural diamond is expensive, and the cost of the drill bit is too high. In order to reduce the manufacturing cost, most of them use Artificial diamond, which can achieve a certain effect in the drilling of general hard formations, but if the formation is highly abrasive, artificial diamond is not enough to resist the abrasiveness of the rock, and the distribution of diamond in the matrix is ​​uneven, resulting in the drill bit Severe early wear and tear, can not be used normally

However, the above method has the following problems: ①With the increase of the specific gravity of tungsten carbide, the sintering temperature of the drill bit also increases, resulting in a decrease in the quality of the diamond; ②The overall performance of the hot-pressed high phosphorus iron-based diamond bit is still low, although it can be Effective for hard and weak abrasive formations, but not effective for strong abrasive formations

[0005] In addition, the British patent GB2454589A pre-wraps different matrix materials around the diamond abrasive, and develops a drill bit cutting structure with mixed strength and weakness. Therefore the promotion effect is not obvious; Chinese patent CN101139727A widens the application of electroplating process in the drill bit manufacturing industry by adopting iron as the matrix material of the diamond drill bit, but the hardness and wear resistance of its product are still not as good as the hot pressing sintering method