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        Usually refers to the drillable, rotational speed and mud displacement three skill parameters that can be manipulated during the drilling process. In practice, drilling skills should be based on formation conditions, drill bit type, drilling equipment, and operator skill levels.
    According to their different needs and conditions, drilling skills are divided into:
        1) Optimize drilling skills: Drilling skill parameters that can reach the best economic goals under certain conditions.
        2) Intensive drilling skills: In order to reach higher drilling speeds, drilling parameters higher than the usual drilling parameters are selected.
        3) Special drilling skills: Special methods or constrained drilling parameters are selected for special purposes.
        Different drilling parameters require different standards and types of drill bits. The method of failure of drill bits in drilling also has its own characteristics and should be treated differently.
        1. Influence of drilling pressure on drilling
          Drilling pressure is a necessary condition for rock breaking at the bottom of the well. The size of the drilling pressure determines the method and characteristics of breaking the rock, which directly affects the drilling speed and the damage method of the drill bit. During drilling, the drill bit is subjected to axial pressure and reversal force. The cutting teeth are worn, dull or damaged during the process of pressing in and shearing the rock, which must affect the drilling speed. With the addition of the drilling pressure, the drilling speed will continue to improve, and the bearings and cutting teeth of the drill bit will also accelerate the wear and affect the drilling speed.
        2. The effect of speed on drilling
          The speed indicates the speed at which the diameter of the drill must rotate. It is the target used to measure the speed of the reversal during the drilling process. When drilling, the rock breaking condition of different hardness rock is different, and the influence of drilling pressure is different. Therefore, the influence of the bit speed on the rock breaking process and the mechanical drilling speed should be considered in the lithology and rock breaking moments.
        (1) Speed ​​in soft formation drilling
           When drilling in a soft, plastic, and abrasive rock formation (such as a clay-like rock formation), the cuttings cut by the cutting teeth are equal to the depth of the cutting teeth and the wear of the cutting teeth is small. Thus, drilling in a soft formation, when the drilling pressure is mandatory, the rotational speed is proportional to the mechanical drilling speed.
        (2) Speed ​​in medium and hard formation drilling
          Medium and hard lamination has high hardness and high abrasiveness. The cutting teeth are continuously blunt during drilling, and the tooth and rock touch area is also increasing, which makes the deformation and crack development of the rock break when the rock breaks. The drilling speed is slower, and the demanding drilling pressure is greater. Following the improvement of the hardness of the formation, the bite breaking moment and extending the drilling speed will make the rock crushing process not complete. The cutting teeth have not fully broken the rock, and they are separated from the rock, which reduces the rock breaking depth. Therefore, in order to prevent the cutting teeth from being worn out quickly, it is not allowed to over-fire and increase the rotational speed when drilling in medium-hard and hard formations.
       (3) Different speeds of drilling in the rock
          Different rock, the drilling speed has a certain change curve and limit speed with the speed. Drilling in clay-like rocks, the rate of penetration is proportional to the speed of rotation; drilling in sturdy, high-abrasive rock, the rate of penetration increases with the addition of speed, which is relatively slow, because the breaking moment extends, the limit speed is higher than other types of rock To be small, when the speed exceeds the limit speed, the drilling speed will decrease.
          After doubling the speed, the experimental roller bit drilled into a different grade of rock. The results showed that the marble grade 4 marble, the rate of penetration rate was 93%, the grade 9 grade of porphyry granite, the rate of penetration rate. Only 28%, from 4th to 9th, the rate of penetration rate is decreasing. Thus, for softer abrasive formations, improved speed is advantageous, while for strong, highly abrasive formations, it does not make much sense.
         In practice, the progressive speed is constrained by the strength, length and drill function of the drill string and the ability of the drilling equipment. During the current period, following the development of small well drilling skills, as well as the improvement of the drill string in the well and the selection of leading lubricants to reduce the reverse wear resistance, high speed will be fully utilized.
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