Hunan New Diamond Construction Machinery Co., Ltd.
|Place of Origin:||Hunan, China (Mainland)|
|Brand Name:||New Diamond|
|Model Number:||11 835 279mm Tricone drill Bits|
|Minimum Order Quantity:||Negotiable|
|Packaging Details:||Carton packaging and wooden box packing|
|Delivery Time:||5-8 work days|
|Payment Terms:||L/C, T/T, Western Union|
|Supply Ability:||According to order quantity|
|IADC Code:||835||Circulation Type:||Jet Air|
|Pin Connection:||6 5/8”API||Metric Bit Diameter:||279mm|
|Product Weight:||74KG||Weight On Bit:||55,000-88,000Ibs|
three cone bit,
roller cone drill bit
The speed indicates how fast the drill must be rotating in diameter, which is the goal of the drilling process to measure the speed of reversal. When drilling, not the same as the rock hardness rock breaking condition is different, the impact of bit weight on it is not the same, so bit speed on rock breaking process and mechanical penetration rate, we should ponder rock and rock breaking moment elements.
(1) Rotational speed during soft ground drilling When drilling in soft, plastic and small abrasive formations (such as clay rock formations), the thickness of the cuttings cut by the cutting teeth is equal to the depth at which the cutting teeth cut into the rock, and the drilling The wear of the cutting teeth is very small. As a result, drilling in soft formations adds speed in direct proportion to ROP while drilling is under pressure.
(2) The rotation speed of medium hard and hard formation during drilling is hard and the hardness is hard to be pressed in, and the grinding property is high. The cutting teeth are continuously blunt and the area of the tooth and rock touch increases. Making the rock crushing deformation and fracture development moment extends, the difficulty of adding slow drilling rate, and the greater demand for bit weight. With the improvement of formation hardness, the time of rock breaking at the bit extends and increases the rate of drilling, which will make the process of rock breaking progress incompletely. The cutting teeth have not yet broken the rock sufficiently to separate from the rock, resulting in the decrease of rock breaking depth. Thus, subject to the rock breaking moment constraints, in order to prevent faster wear cutting teeth, hard and hard ground drilling can not increase the speed too much.
(3) is not the same rock drilling speed is not the same rock, drill speed with the speed added must have changed the curve and speed limit. Drilling in clay rocks with a penetration rate proportional to rotation speed; drilling in solid, highly abrasive rock with slower penetration rate due to extension of rock breaking moment with faster limit rotation than other rock types To be small, when the speed exceeds the limit speed, will result in lower drilling speed. After doubled speed, the experimental roller cone drilled different grades of rock. The results showed that the marble with grade 4 is rock, the drilling rate is 93%, and the grade 9 is macular granite. Only 28%, from 4 to 9, the rate of penetration rate showed a decreasing curve. Thus, for softer abrasive formations, progressive speed is favorable, while for strong, high-abrasive formations, it is not significant.
· Please select the applicable formation and parameters according to the instructions.
· Carefully check the bits appearance and to check the bits threaded end face,whether the serial number on the box and certificate.
· Selection of WOB and RPM should be within the limits of the recommended parameters, higher WOB and RPM cannot be used simultaneously.
· Bottom hole must be clean and bit must not be used for long section reaming.
· Drilling process must operate smoothly, find that there is Bie jump on abnormal phenomenon, should be timely analysis and take effective measures
· The bit should be kept indoor with dry and well ventilated conditions at 10-33℃ and kept from sunshine and rain. Stored under such conditions, quality of bit is guaranteed for 3 years.
|Bit Diameter||IADC||Applications||Special Features(Cutting Structure,Lug Protection)||Weight||PIN Conn||Operating Suggestions WOB/RPM|
|11 279mm||835||Extremly hard and abrasive formations with high compressive strengths.||Ovoid on gage,ogive on inner rows;Hardmetal on lug;Wear resistant carbide on shirttail lip and lug.||163||74||6 5/8”API||55,000-88,000Ibs/80-50RPM|
1. Price commitment: in order to ensure the high reliability of products, raw material selection are using grapefruit brand products; under the same competitive conditions, and not to reduce product technical performance on the basis of sincerity at a favorable price to customers.
2. Quality commitment: product manufacturing and testing have quality records and inspection data; the performance of the product can withstand customer inspection.
3. Customer service: in order to create new diamond brand, enhance the visibility of enterprises,establish corporate image, we serve customers with the principle of "preferential prices, good service, reliable product quality" principle.
Contact Person: Rick.liao