王永龙,郭佳宽,余在江,杜康,孙玉宁
WANG Yonglong,GUO Jiakuan,YU Zaijiang,DU Kang,SUN Yuning

• 1:河南理工大学能源科学与工程学院
• 2:煤炭安全生产与清洁高效利用省部共建协同创新中心

摘要(Abstract)：

施工瓦斯抽采钻孔是治理瓦斯危害的必要手段，针对松软煤层钻进因钻杆自重大引起的钻进阻力大、钻进效率低及劳动强度高等问题，提出了优化钻杆结构以减少自重并降低钻进阻力的研究思路，通过设置四翼内凹结构达到减小钻杆自重及降低钻进阻力的目的，并依此设计了四翼内凹刻槽钻杆，兼顾钻杆推进阻力和旋转扭矩损失，建立了钻杆钻进阻力模型，结合ANSYS数值模拟方法对四翼内凹刻槽钻杆进行强度校核分析与参数优化，研制了四翼内凹刻槽钻杆，并进行了现场工业性试验。研究表明：(1)对于100 m钻孔深度，四翼内凹刻槽钻杆相对于圆状刻槽钻杆质量减轻了21.88%，在正常钻进时，四翼内凹刻槽钻杆与圆钻杆相比旋转扭矩损失降低了25.10%；与圆状刻槽钻杆相比降低了20.90%。在塌孔10 m的情况下，四翼内凹刻槽钻杆钻进阻力相对于圆钻杆降低了51.44%，相对于圆状刻槽钻杆降低了43.65%。(2)对四翼内凹刻槽钻杆进行强度分析与参数优化，结果显示，在常规坑道钻机作用下，钻杆最大应力与内凹深度呈正相关，与壁厚呈负相关，壁厚对于应力的影响大于内凹深度的影响，且在内凹宽度为33 mm、深度为4 mm、壁厚为11.5 mm时，安全系数为1.59。(3)现场工业性试验表明，四翼内凹刻槽钻杆排渣顺畅，强度可靠，钻进深度提高了18.18%，钻进效率提高了17.80%。在保证钻杆强度的前提下、通过钻杆结构创新有效降低钻杆质量，对于降低工人劳动强度、提高钻进效率和成孔率具有显著的效果，为推动复杂地层钻探技术发展提供了新的方法。
Gas drainage boreholes during construction is a necessary means to control gas hazards. In response to the issues such as high drilling resistance, low drilling efficiency, and high labor intensity caused by the significant selfweight of the drilling rod in drilling into the soft coal seams, a research approach of reducing the self-weight and lowering the drilling resistance by optimizing the drilling rod structure was proposed. Thus, a four-winged concave grooved drilling rod was designed to address both of its advancing resistance and rotating torque losses. Meanwhile, a drilling resistance model for the drilling rod was established. On this basis, the strength verification analysis and parameter optimization for the four-winged concave grooved drilling rod was conducted with the ANSYS numerical simulation method. Subsequently, the drilling rod was developed, and industrial-scale field experiments were carried out. The study shows that:(1), the four-wing concave grooved drilling rod reduces the weight by 21.88% in every 100-meter drilling depth, compared to a circular grooved drilling rod. During normal drilling, the rotating torque loss of the four-wing concave grooved drilling rod is reduced by 25.10% compared to a circular rod and by 20.90% compared to a circular grooved drilling rod. In case of a collapse hole of 10 meters, the drilling resistance of the four-wing concave grooved drilling rod is reduced by 51.44% compared to a circular rod, and by 43.65% compared to a circular grooved drilling rod.(2) Strength analysis and parameter optimization of the four-wing concave grooved drilling rod show that under the action of a normal tunnel drilling machine, the maximum stress of the drilling rod is positively correlated with the concave depth and negatively correlated with the wall thickness. The influence of wall thickness on stress is greater than that of concave depth. Besides, the safety factor is 1.59 when the concave width is 33 mm, the depth is 4 mm, and the wall thickness is 11.5 mm.(3) On-site industrial experiments demonstrate that the four-wing concave grooved drilling rod works for smooth slag discharge, with reliable strength, having the drilling depth increased by 18.18%, and drilling efficiency improved by 17.80%. By effectively reducing the weight of drilling rods through innovative structural design while ensuring their strength, significant improvements can be achieved in reducing labor intensity, increasing drilling efficiency, and achieving a higher hole formation rate. Generally, this research provides a new method for promoting the development of drilling technology in complex geological formations.

关键词(KeyWords)： 松软煤层;瓦斯抽采;钻杆减重;钻进阻力;强度校核
soft coal seam;gas drainage;weight reduction of drilling rod;drilling resistance;strength verification

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41872188);; 中原学者基金项目(234000510003);; 河南省自然科学基金项目(242300421249)

作者(Author): 王永龙,郭佳宽,余在江,杜康,孙玉宁
WANG Yonglong,GUO Jiakuan,YU Zaijiang,DU Kang,SUN Yuning

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