4/6/2025, 12:19:18 AM 星期日
PDC钻头V形齿的磨损对岩石接触面积的影响
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中国地质大学(北京)工程技术学院,北京 100083


Influence of Wear on Rock contact area of V-shaped Cutter PDC Bit
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Affiliation:

School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China

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    摘要:

    With the increasing demand for deep-sea and deep-earth drilling, the downhole drilling tools using traditional PDC bits are severely worn out and cannot fully meet the drilling requirements of deep wells in hard formation. Therefore, special-shaped cutter PDC bit, especially V-shaped cutter PDC bit, has become the focus of research. There are fewer studies on the effect of wear on contact area of V-shaped cutter PDC bit. The contact area affects contact pressure of cutter, which in turn affects the depth of penetration into the rock and drilling efficiency, so it is of great significance to study the change rule of contact area of V-shaped cutter. In order to calculate the contact area of V-shaped cutter with the rock during the wear, the expressions for contact area as a function of the wear height and the geometric parameters of V-shaped cutter, such as chord length and tangent angle, were derived using the method of planar oblique intersection of the cylindrical surface on which the cutter is located, and the effects of the geometric parameters of V-shaped cutter and wear height on contact area and contact pressure were analyzed. The results show that: the cylindrical cutter and V-shaped cutter have the same contact area in the early stage of wear, when the cutter is worn to a certain stage, the contact area of the V-shaped cutter is smaller than that of the cylindrical cutter. The smaller the chord length and tangent angle are, the smaller the contact area is. Under the same load and the wear height of the cutters, the contact pressure between the V-shaped cutter and rock is larger than that of the cylindrical cutter, so the V-shaped cutter has the ability to penetrate deeper into the rock. For wellsite applications, the driller can measure and record the wear height and the corresponding ROP of a batch of the same type bits after lifting. The statistical relationship between the wear height and ROP can be obtained for this type of bit, and then the contact area can be estimated from the wear height. This method makes it easy to adjust the weight on bit in time to maintain a high ROP, or to optimize the V-shaped cutter geometry parameters during design, which also helps to improve drilling efficiency.

    Abstract:

    With the increasing demand of deep-sea and deep-earth drilling, the wear of downhole drilling tools using traditional PDC bit is serious, which cannot fully meet the drilling requirements of deep wells in hard formation, so the special-shaped cutter PDC bit, especially the V-shaped cutter PDC bit, become the focus of research. At present, there are few studies on the influence of wear on rock contact area of V-shaped cutter PDC bit, so it is very important to study the influence of V-shaped cutter wear on its ROP. In order to calculate the contact area between the V-shaped cutter and the rock in the wear stage, by using the method of plane inclined intercepting the cylindrical surface where the composite piece is located, we deduce the expression of the contact area as a function of the wear height and the geometric parameters of the V-shaped cutter, such as chord length and tangent angle, and we analyze the influence of the geometric parameters of the V-shaped cutter and the wear height on the contact area and the contact pressure. The results show that: in the early stage of wear, the contact area of cylindrical cutter and V-shaped cutter is the same, when the composite piece wears to a certain stage, the contact area of V-shaped cutter is smaller, and the smaller the chord length and tangent angle are, the smaller the contact area is; under the same load, when the wear reaches to a certain stage, the contact pressure of the V-shaped cutter is larger compared to that of the cylindrical cutter, and it have the ability to cut deeper into the rock. When drilling rock formations, V-shaped teeth PDC drills can be used, by measuring the height of the cutting teeth wear and accurately calculating the contact area between the cutting teeth of the drill bit and the rock, it is convenient to adjust the drilling pressure in time to maintain a higher drilling speed; or optimize the geometric parameters of the V-shape teeth when designing, which is also conducive to improving the drilling efficiency.

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  • 收稿日期:2024-08-13
  • 最后修改日期:2024-11-13
  • 录用日期:2024-11-27
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