高温硬岩空气潜孔锤钻头设计

干热岩试验性开发井钻井施工,在高温硬岩的地层条件下,如何实现高效钻进仍存在很多技术难点。空气潜孔锤钻进技术是解决硬岩地层钻进的有效方法之一,潜孔锤钻头是空气潜孔锤钻进的关键器具。根据青海共和干热岩GH-01井空气潜孔锤钻进技术应用情况,分析探讨了空气潜孔锤钻头断齿、掉齿、磨损严重、使用寿命短等问题,从钻头结构设计、钻头材料选取、钻头冷压固齿工艺等几个方面对空气潜孔锤钻头进行了优化。固齿优化过程中采用有限元分析方法,对钻头冷压固齿过盈量进行仿真分析计算,根据分析计算结果确定最优固齿过盈量。通过对潜孔锤钻头结构、材料、加工等优化,为适用于高温硬岩的空气潜孔锤钻头研制提供了借鉴。为提高空气潜孔锤钻进综合效率,为干热岩钻探开发提供了技术支持和技术储备。

Development of the air DTH hammer drilling bit for high temperature hard rock

Experimental hot dry rock development wells are drilled under high?temperature and hard rock formation conditions where there are still many technical difficulties in how to achieve efficient drilling.Air DTH hammer drilling technology is one of the effective methods to solve the problems with drilling in hard rock formations.The DTH hammer bit is the key tool for air drilling.Through the application of air DTH hammer drilling technology in the hot dry rock well GH-01 in Gonghe of Qinghai,the paper analyzes and discusses the problems of broken teeth,severe wear and short service life of the air DTH hammer bits.The air DTH hammer drill bit was optimized from several aspects,such as drill bit structure design,drill bit processing material selection,and drill bit cold pressing and tooth fitting technology.The finite element analysis method was used in the optimization process of tooth fitting to simulate and calculate the interference of the cold?pressing tooth fitting process,and according to the results of analysis and calculation,the optimal interference of tooth fitting was determined.The optimized structure,materials,and processing of the DTH hammer bit can provide some reference for the development of air DTH hammer bits suitable for drilling high?temperature hard rock,improve the comprehensive drilling efficiency of air DTH hammer drilling,and provides technical support and reserve for the development of hot dry rock.