Abstract: On the basis of analyzing the characteristics of the stratum stratum, the problems existing in drilling the stratum are pointed out. The design idea of ​​the new type of diamond-plated drill bit for drilling in the stratum is proposed. The main and l are used in the working layer of the drill bit. Two kinds of grinding are supplemented, and the working mechanism, treatment process and manufacture of the new type of drill are described. The indoor drilling test results of the drill bit show that the drilling time efficiency of the new type of diamond-plated drill bit is increased by 1.93 times and the average wear amount is increased by 38% compared with the ordinary diamond drill bit when drilling a hard and dense zirconium corundum. The advantage of aging and long life is the ideal drill for drilling in slipping formations. Key words: Slip formation I new impregnated lacquer bit; main abrasive; auxiliary abrasive; drilling test Hard and dense weak abrasive rock (also known as slipping stratum) widely developed in China, with the following three characteristics: 1 rock hardness Large, high in quartz content. Its rock intrusion hardness is generally up to 5 000 MPa, some of which are between 5 500 and 6 500 MPa, and some even up to 7000 MPa. 2 High strength. The rock-forming minerals of this type of rock formation are fine, the particle size is mostly 0.01~0.20 mm, the siliceous cementation, the bonding force between the particles is large, the structure is compact, and the overall strength is high. Its uniaxial compressive strength is 150 MPa or higher. 3 Weakness is weak. Due to the low aging time, the rock powder is small and the particles are fine, the wear of the bit body is very small, and the diamond is difficult to blade. When drilling hard and dense weak abrasive rock formations, ordinary diamond drill bits are prone to "slip" phenomenon, that is, the diamond drill bit slips on the rock without drilling, or the footage is extremely slow, and the aging is often 0.1-0.2. m/h; the return footage is only 0.2~O. 5 m, the service life of the drill bit is 2 to 3 m. Due to the occurrence of the slip phenomenon, even if the rock layer is only a few meters or more than a dozen meters, it takes a lot of time and a drill bit, resulting in an extended construction period of the entire drilling, an increase in exploration costs, and a decrease in economic efficiency. Therefore, it is of practical significance to solve the problem of drilling and slipping in this type of rock formation. 1 Sliding formation drilling status and existing problems In order to solve the problem of drill slip during drilling, the predecessors have carried out various researches, carried out many experiments and production practices, and produced many methods to overcome the drill slip: 1 Diamond drill bit Artificial blade method. There are mainly grinding method, sand blasting method, lip surface etching method, hole bottom sanding method, etc. The auxiliary working time required by this method is not increased much, but if the amount of sand is too much, or the time of sanding is not mastered Well, it will lead to faster wear of the drill bit and reduce the life of the drill bit. 2 Soft carcass bit method. However, if the carcass in the method is too soft, the carcass strength of the entire diamond bit will be insufficient, and even the bit will be deformed and cannot be used. 3 Shaped lip face bit method. Such as high and low edge and concentric round claw lip drill. However, after drilling for a certain period of time, the sharp teeth are smoothed, the drilling speed drops rapidly, and the advantages of the sharp teeth are no longer existed, which is the same as the ordinary drill. 4 Weakly inlaid diamond bit method. This method uses a weak encapsulation process for diamond. In this type of drill bit, the diamond is properly detached from the carcass during drilling, and the carcass is worn, which is beneficial to the diamond blade and can improve the time efficiency of the drill bit, but the life of the drill bit is reduced, so it is not the fundamental method for solving the drilling of the slip formation. 2 The design of the new impregnated diamond drill bit is to solve the problem of drill bit slip during drilling. Combining the work of the predecessors, it breaks the conventional idea of ​​improving the performance of the drill bit from the structural shape of the drill bit, the soft and hard performance of the carcass, and the volume fraction of the diamond. The design idea of ​​the new type of impregnated diamond drill bit in the slipping stratum is proposed, and the application effect is verified by experiments. The design idea is to select two kinds of abrasives as the main and auxiliary abrasives in the working layer of the drill bit. The main abrasive is the main crushing material for cutting the rock layer, and the auxiliary abrasive is the secondary crushing material, which is mainly used to realize the self-sharpness of the carcass. The organic combination of the main and auxiliary abrasives can improve the performance of the drill bit and improve the life of the drill bit. And drilling aging, to solve the "slip" problem in the hard and dense weak abrasive rock drilling. Granular compressive strength is large. durable. The ability to print rock is strong, and a vacuum casting process is used to deposit a strong carbide on the surface of the diamond. The ruthenium metal w plating layer has the following effects: 1 diaphragm action. Separating diamond from oxygen and carcass material during high temperature sintering of the drill bit. The diamond is protected from the oxidation of oxygen and the erosion of the carcass material. Reduce the loss of the barrier stone 2 Improve the surface properties of the diamond to greatly improve the wetting properties of the diamond and the carcass material, and improve the bonding force between the diamond and the carcass material during sintering. The diamond is firmly wrapped in the carcass material and does not fall off easily. As the main cutting material of the working layer of the drill bit, the working time is prolonged. Can greatly improve the life of the drill bit. (2) The auxiliary abrasive is made of low-quality diamond or other abrasive. The surface of the auxiliary abrasive is coated with a layer of WC powder by rolling granulation process. The adhesion of this layer of WC powder to the auxiliary abrasive is poor. The auxiliary abrasive can be separated from the carcass material. Therefore, the auxiliary abrasive is not firmly wrapped in the carcass material when drilling. The auxiliary abrasive easily falls off the carcass material and enters the L bottom. Worn carcass. The main abrasive is exposed in time to cut the rock. 3 Treatment process of main and auxiliary abrasives in the working layer of the drill bit 3.1 Vacuum plating of the main abrasive surface W. Take an appropriate amount of wo 3 . Powder. Wet with HF acetone solution, add titanium hydride powder and diamond particles. After mixing, put it into the vacuum evaporation equipment for plating. The plating temperature is 820oC. The holding time is 1 h, and the surface morphology of the diamond-plated metal w is shown in Fig. 1.
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