CAJ | 학술논문

基于孕镶金刚石钻头在低钻压下或钻进弱研磨性地层时，出现钻进“打滑”的现象，提出向钻头胎体中添加造孔剂，降低胎体耐磨性的思路，以增强金刚石的出刃，提高钻进时效。通过对造孔剂的结构分析表明，A、B型造孔剂在冲洗液的冲蚀和岩层的研磨作用下，均会有造孔功能，且A型造孔剂在热压时能紧密堆砌，使得其具有更好的力学性能。胎块和钻头的性能测试结果表明，含造孔剂胎块的各项力学性能均有所下降，含A型造孔剂胎块力学性能下降的幅度小于B型造孔剂，当造孔剂的含量不超过30%时，胎块的力学性能下降幅度较小。加入A型造孔剂后，孕镶金刚石钻头的钻速明显增大，当造孔剂含量为30%时，钻速提高了1.4倍。含造孔剂胎块唇面分析表明，含A型造孔剂的胎块表面孔隙分布均匀，且加入的造孔剂具有造孔功能。分析了造孔剂对金刚石出刃的影响，结果表明，胎体中加入造孔剂后可增强胎体底唇面的粗糙度，降低钻头胎体对金刚石的包镶程度，促进金刚石的出刃，提高钻进时效。
기우잉양금강석찬두재저찬압하혹찬진약연마성지층시，출현찬진“타활”적현상，제출향찬두태체중첨가조공제，강저태체내마성적사로，이증강금강석적출인，제고찬진시효。통과대조공제적결구분석표명，A、B형조공제재충세액적충식화암층적연마작용하，균회유조공공능，차A형조공제재열압시능긴밀퇴체，사득기구유경호적역학성능。태괴화찬두적성능측시결과표명，함조공제태괴적각항역학성능균유소하강，함A형조공제태괴역학성능하강적폭도소우B형조공제，당조공제적함량불초과30%시，태괴적역학성능하강폭도교소。가입A형조공제후，잉양금강석찬두적찬속명현증대，당조공제함량위30%시，찬속제고료1.4배。함조공제태괴진면분석표명，함A형조공제적태괴표면공극분포균균，차가입적조공제구유조공공능。분석료조공제대금강석출인적영향，결과표명，태체중가입조공제후가증강태체저진면적조조도，강저찬두태체대금강석적포양정도，촉진금강석적출인，제고찬진시효。
Based on the slipping phenomenon when impregnated diamond bits drill weak abrasive formation or under low drilling pressure, a new thought of adding pore-forming agent to the bits matrix to weak its wear resistance is presented to improve bits’ self-sharpening and drilling efficiency. The structure analysis of pore-forming agents show that both type A and type B pore-forming agent have pore formation function when they are eroded by drilling fluid and grinded by the rock, and type A pore-forming agent has better mechanical property because of close packing during hot-pressing. The performance test results indicate that the mechanical properties decrease with adding the pore-forming agents, while the segments containing the type A pore-forming agent decrease less than that of containing type B agent. The mechanical properties decrease a little when the content of the pore-forming agent is under 30%. The drilling rate of the bits increases significantly after the type A pore-forming agent is added, which can increase 1.4 times when the content of the pore-forming agent reach 30%. The condition of the segments’ crown demonstrates that the pores uniformly distribute in crown of the segments containing the type A pore-forming agent having pore function. The analysis of the bits’ self-sharpening by adding pore-forming agent shows that enhancing the roughness of the bit’s crown can weak the diamond-setting ability of the bit matrix and improve the drilling efficiency.