关键词: PDC钻头, 个性化设计, 水平井, 砂砾岩, 钻井

Abstract: Mahu tight conglomerate oil field in Junggar Basin is a key area for Xinjiang oilfield to increase production. In the horizontal sections of glutenite in Aihu well area of Xinjiang Oilfield with strong heterogeneity and poor drillability，a drill bit has only a short footage and a high decommissioning rate，giving rise to long-time drilling. In view of the long drilling period there，formation lithology，drill bit usage and drilling parameters of the drilled wells were analyzed and studied，and a new type of individualized PDC bit was designed and developed. Packaged with optimized drilling parameters and drill string assembly，a technical scheme based on the new bit to improve the drilling speed was formulated. After the application of this new bit to the drilling in glutenite horizontal sections，mechanical penetration rate increased by 137.46% and footage increased by 32.7~153.3%，compared with the average parameters per bit in this block. Field application shows that the new individualized PDC bit specially designed is highly targeted，and the packaged technical scheme to increase drilling speed is reasonable. With this scheme，mechanical penetration rate and footage for one run of bit were significantly improved，and drilling period and cost were reduced，laying a sound foundation for the development and application of individualized bits similar to this application.

Key words: PDC bit, individualized design, horizontal well, glutenite, drilling