What are the characteristics of Surface Set Diamond Core Bits
2025-12-15
Surface Set Diamond Core Bits is a coring tool made by directly embedding diamond particles into the working surface of the drill bit body. Its core characteristics are strong targeting, controllable cost, and adaptability to coring operations in medium to hard formations. It can be divided into four categories: performance characteristics, structural process characteristics, application advantages, and limitations
Core performance characteristics
High cutting efficiency and strong targeting: Diamond particles are exposed on the surface of the matrix and cut directly in contact with the rock, resulting in fast rock fragmentation speed; The particle size and concentration of diamond can be adjusted according to the hardness of the formation, such as using coarse and high concentration diamond for hard and brittle formations, and fine and low concentration diamond for medium hard formations, with flexible adaptability.
Good wear resistance and stable lifespan: Diamond hardness far exceeds various types of rocks. When working in abrasive formations, the wear rate of the matrix is slower than that of diamond, which can maintain effective cutting for a long time, avoid frequent replacement of drill bits, and improve the efficiency of core extraction operations.
High core quality and intact rock core: The cutting tooth design is regular, and the crushing effect on the rock is concentrated at the edge of the drill bit. The rock core column is minimally disturbed, and high integrity rock core samples can be obtained, meeting the strict requirements for rock core quality in geological exploration and mineral testing.
Structure and process characteristics
Simple structure and low manufacturing cost: Compared with impregnated diamond core drill bits (where diamonds are evenly distributed inside the matrix), surface mounted drill bits require less diamond and have a simplified processing technology, without the need for complex matrix sintering and infiltration processes. They have lower production costs and are suitable for small and medium-sized batch customization.
The bonding between the tire body and the diamond is firm: the diamond is fixed on the surface of the tire body by electroplating or hot pressing sintering process, with high bonding strength and less diamond detachment during operation; The tire body material can be selected from copper based, iron-based, or cobalt based alloys according to the needs, to adapt to the grinding properties of different geological layers.
There are various specifications for drill bit diameters: different diameters of core drill bits can be made, covering a full range of requirements from geological exploration small diameters (such as Φ 28mm) to engineering construction large diameters (such as Φ 300mm or more), meeting different scenarios such as core sampling and concrete drilling core extraction.
Application advantages
Wide adaptability to geological strata: mainly used for medium hard to hard and moderately abrasive strata, such as granite, quartz sandstone, limestone, marble and other rock strata, and can also be used for drilling and core detection of concrete components and asphalt pavements.
Easy maintenance and repeatable repair: When the surface diamond wears out, the drill bit can be repaired by re electroplating or welding diamond particles, extending the overall service life and further reducing operating costs.
Flexible drilling parameters: The requirements for drilling pressure and speed are relatively relaxed, and ordinary drilling rigs can be used in conjunction without the need for specialized high-power drilling equipment, making it suitable for mobile work scenarios such as field geological exploration.
limitation
Not suitable for extremely abrasive formations: In highly abrasive formations with extremely high quartz content, the wear rate of the matrix will accelerate, leading to premature diamond detachment and significantly shortened drill bit life. At this time, it is more suitable to use impregnated diamond core drill bits.
Weak impact resistance: When diamond particles are exposed, if they encounter formation fractures or hard interlayers during drilling, they are prone to diamond fracture due to excessive impact load, which affects drilling stability.
The efficiency of deep hole drilling is limited: in deep and ultra deep well operations, the cooling conditions of the drill bit are poor, the body is prone to softening due to high temperature, and it is difficult to discharge rock powder, which will reduce cutting efficiency. A good cooling and slag discharge system is needed.
Core performance characteristics
High cutting efficiency and strong targeting: Diamond particles are exposed on the surface of the matrix and cut directly in contact with the rock, resulting in fast rock fragmentation speed; The particle size and concentration of diamond can be adjusted according to the hardness of the formation, such as using coarse and high concentration diamond for hard and brittle formations, and fine and low concentration diamond for medium hard formations, with flexible adaptability.
Good wear resistance and stable lifespan: Diamond hardness far exceeds various types of rocks. When working in abrasive formations, the wear rate of the matrix is slower than that of diamond, which can maintain effective cutting for a long time, avoid frequent replacement of drill bits, and improve the efficiency of core extraction operations.
High core quality and intact rock core: The cutting tooth design is regular, and the crushing effect on the rock is concentrated at the edge of the drill bit. The rock core column is minimally disturbed, and high integrity rock core samples can be obtained, meeting the strict requirements for rock core quality in geological exploration and mineral testing.
Structure and process characteristics
Simple structure and low manufacturing cost: Compared with impregnated diamond core drill bits (where diamonds are evenly distributed inside the matrix), surface mounted drill bits require less diamond and have a simplified processing technology, without the need for complex matrix sintering and infiltration processes. They have lower production costs and are suitable for small and medium-sized batch customization.
The bonding between the tire body and the diamond is firm: the diamond is fixed on the surface of the tire body by electroplating or hot pressing sintering process, with high bonding strength and less diamond detachment during operation; The tire body material can be selected from copper based, iron-based, or cobalt based alloys according to the needs, to adapt to the grinding properties of different geological layers.
There are various specifications for drill bit diameters: different diameters of core drill bits can be made, covering a full range of requirements from geological exploration small diameters (such as Φ 28mm) to engineering construction large diameters (such as Φ 300mm or more), meeting different scenarios such as core sampling and concrete drilling core extraction.
Application advantages
Wide adaptability to geological strata: mainly used for medium hard to hard and moderately abrasive strata, such as granite, quartz sandstone, limestone, marble and other rock strata, and can also be used for drilling and core detection of concrete components and asphalt pavements.
Easy maintenance and repeatable repair: When the surface diamond wears out, the drill bit can be repaired by re electroplating or welding diamond particles, extending the overall service life and further reducing operating costs.
Flexible drilling parameters: The requirements for drilling pressure and speed are relatively relaxed, and ordinary drilling rigs can be used in conjunction without the need for specialized high-power drilling equipment, making it suitable for mobile work scenarios such as field geological exploration.
limitation
Not suitable for extremely abrasive formations: In highly abrasive formations with extremely high quartz content, the wear rate of the matrix will accelerate, leading to premature diamond detachment and significantly shortened drill bit life. At this time, it is more suitable to use impregnated diamond core drill bits.
Weak impact resistance: When diamond particles are exposed, if they encounter formation fractures or hard interlayers during drilling, they are prone to diamond fracture due to excessive impact load, which affects drilling stability.
The efficiency of deep hole drilling is limited: in deep and ultra deep well operations, the cooling conditions of the drill bit are poor, the body is prone to softening due to high temperature, and it is difficult to discharge rock powder, which will reduce cutting efficiency. A good cooling and slag discharge system is needed.
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