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

摘要： 准噶尔盆地玛湖致密砂砾岩油田是新疆油田提产的重点区域。针对新疆油田艾湖井区砂砾岩水平段地层不均质性强、可钻性差，钻头单只进尺短，报废率高，导致钻井周期长的难题。对艾湖井区已钻井的地层岩性、钻头使用情况、钻井参数等进行分析研究，设计开发了针对艾湖区块砂砾岩水平段的新型个性化PDC钻头，配套优化的钻井参数及钻具组合，形成了以钻头为主体的提速技术方案。开发的新型个性化钻头在艾湖井区砂砾岩水平段应用，便取得了机械钻速比该区块钻头的平均机械钻速提高137.46%、进尺比之前钻头单只平均进尺提高32.7%～153.3%的良好效果。现场应用情况表明，设计开发的艾湖区块水平段砂砾岩个性化PDC钻头针对性强，配套提速技术方案优化合理，显著提高了机械钻速和单趟钻头进尺，节约了钻井周期和成本，也为类似砂砾岩水平段个性化钻头的开发应用奠定了良好的基础。

关键词: PDC钻头, 个性化设计, 水平井, 砂砾岩, 钻井