Abrasion Rule of Polycrystalline Diamond Compact Bit Cutter
- PDF / 988,790 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 9 Downloads / 156 Views
TECHNICAL ARTICLE–PEER-REVIEWED
Abrasion Rule of Polycrystalline Diamond Compact Bit Cutter Jingjing Wu . Shaohe Zhang . Xingyu Ding . Feilong Qu . Xiaohong Xie
Submitted: 18 March 2019 Ó ASM International 2019
Abstract To decrease polycrystalline diamond compact (PDC) cutter abrasion and improve the PDC bit’s drilling performance, based on the academic analysis, a series of rock cutting experiments were made on a lathe with a single PDC cutter to understand better the effects of cutting angle, height of protrusion, linear velocity and the indentation hardness on PDC cutter wear. By the experiments, it shows that the different cutting angles are suitable to different heights of protrusion; for example, the optimal protrusion height of PDC bit with cutting angles of 25° is 3 mm. Also, the PDC abrasion volume and the linear velocity are found to be in direct proportion during well drilling operations, and the PDC abrasion volume can be obtained by the formula V = dlpFvt. Besides, the PDC cutter’s abrasion volume is in inverse proportion to J. Wu School of Civil Engineering, Hunan University of Technology, Zhuzhou, People’s Republic of China S. Zhang (&) Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Ministry of Education, Changsha, People’s Republic of China e-mail: [email protected] X. Ding (&) College of Civil Engineering, Hunan City University, Yiyang, People’s Republic of China e-mail: [email protected] F. Qu Zhongye Changtian International Engineering Co., Ltd, Changsha, People’s Republic of China X. Xie Editorial Department of Journal of Earth Science, China University of Geosciences, Wuhan, People’s Republic of China
indentation hardness. It is suggested to select the PDC bit with larger cutting angle when drilling the rock samples with larger indentation hardness and select the smaller cutting angle when drilling the soft formation. Field drilling tests of five bits with different cutting angles are conducted to verify the validity of the laboratory tests. The drilling experiment results agree with the results obtained by the laboratory tests. The results of this study can be applied to each PDC cutter on a given bit; then, the contributions of every cutter can be integrated to determine the bit performance. Also, this study can serve as a guidance for developing new PDC bit design that are optimized for specific rock formations. Keywords PDC bit cutter Abrasion rule Cutting angle Height of protrusion Linear velocity Rock indentation hardness
Introduction Polycrystalline diamond compact (PDC) bits have gained wide popularity in petroleum and gas drilling due to its steadily improved drilling performance, the long bit life and high rates of penetration (ROP) [1]. The shearing action induced by fixed drag cutters has proven to be more efficient for penetrating rock. Wang et al. [2] indicated that the PDC bits were being used to drill about 60% of the total drilled footage in 2006. However, one of the challenges that m
Data Loading...
