PDC无心钻头结构参数与钻进性能的关系   总被引：2，自引：0，他引：2  

唐胜利  卢文锦 《煤田地质与勘探》1996,24(2):59-62

ＰＤＣ无心钻头结构参数与钻头钻进性能有密切联系，通过全尺寸钻头室内实钻正交试验，研究了各结构参数与钻头钻进速度的关系，确定了ＰＤＣ无心钻头优化结构参数组合。  相似文献   

根据岩石力学性质设计及合理使用金刚石钻头专家系统的研制          下载免费PDF全文

张祖培  孙友宏  秦玉生 《探矿工程》1995,(5):30-33

经过系统分析总结钻探专家们根据岩石力学性质设计及合理使用金刚石钻头方面的知识和经验，选择了合适的工具，编制成相应的专家系统，便于推广应用。  相似文献   

表镶大颗粒人造金刚石钻头受力及水力学数值模拟研究          下载免费PDF全文

王骕  刘宝昌 《探矿工程》2016,43(8):64-68

人造大颗粒金刚石技术的不断发展,使得利用其制造表镶金刚石钻头在技术上及经济上均变得可行。本文对φ75 mm表镶人造金刚石钻头的受力、流场与温度场进行了数值模拟,结果表明：金刚石颗粒在高钻压无钻井液循环的条件下极易发生碳化;在钻井液冷却作用下,钻头旋转一圈0.08 s,钻头体会在0.006 s之内冷却;同时水力空化作用与钻井液中固相颗粒对钻头体的冲蚀作用明显;金刚石颗粒内存在较大微裂纹时,金刚石会在小于其许用应力条件下发生破坏。通过对比分析,表镶金刚石钻头的最外侧与最内侧水口处的金刚石较易发生破坏,在设计与制造钻头时应进行强化。  相似文献   

厦门市东西溪防洪堤土方压实质量的控制     

苏镭 《水文地质工程地质》2003,30(3):72-74

通过厦门市同安区东西溪工程防洪体系土堤和挡土墙背土料的碾压、振密试验,并进行现场跟踪检验,分析防洪土堤压实度、挡土墙后砂的相对密度与碾压遍数、振密机型、施工含水量的内在联系,为现场土方压实质量的控制找到一种较为有效的方法。  相似文献   

青藏铁路基础桩孔施工用旋挖钻具的研究   总被引：3，自引：0，他引：3  

于好善 《探矿工程》2003,30(4):1-3

根据青藏铁路采用旋挖钻进施工的特点，研制出适应青藏铁路各种地层条件的旋挖钻具，并制定出一套科学的旋挖钻进工艺，从而解决了青藏铁路桥桩基础施工这一世界难题，也为实现旋挖设备和钻具国产化打下良好基础。  相似文献   

Numerical Simulation of Breaking Wave Based on Higher-Order Mild Slope Equation   总被引：4，自引：0，他引：4  

TAO Jianhua 《中国海洋工程》2001,(2):269-280

The "surface roller" to simulate wave energy dissipation of wave breaking is introduced into the random wave model based on approximate parabolic mild slope equation in this paper to simulate the random wave transportation including diffraction, refraction and breaking in nearshore areas. The roller breaking random wave higher-order approximate parabolic equation model has been verified by the existing experimental data for a plane slope beach and a circular shoal, and the numerical results of random wave breaking model agree with the experimental data very well. This model can be applied to calculate random wave propagation from deep to shallow water in large areas near the shore over natu ral topography.  相似文献   

扇贝边中酸性粘多糖的提取   总被引：6，自引：0，他引：6  

王长云  管华诗 《中国海洋大学学报(自然科学版)》1992,(Z1)

通过蛋白酶水解和乙醇沉淀,从扇贝柱加工下脚料(扇贝边)中提取酸性粘多糖。用正交实验优选出酶解条件,当乙醇沉淀时,对乙醇浓度作了选择。用所选酶解条件水解扇贝边,水解液经脱色处理后,用60％(V/V)乙醇沉淀得粗制粘多糖,经精制后得到粘多糖3.2×10~(-4)(W/W)(相对于鲜冻原料)。  相似文献   

双孕镶金刚石钻头跟套管连续钻进机构设计及模拟分析          下载免费PDF全文

王金龙  高科  张宗正  赵研  谢晓波 《探矿工程》2022,49(3):92-99

跟管钻进技术是解决复杂地层钻进的有效方法之一,针对跟管钻进过程中内外管环空间隙卡阻、钻具受力复杂、能耗大和套管连续下入深度有限、深孔干热岩花岗岩在热应力作用下破碎卡钻等技术难题,本文创新设计了一种双孕镶金刚石钻头跟套管连续钻进机构。理论分析表明：双钻头同心回转钻进岩屑小,避免内外管卡阻,极大地改善了钻具的受力状态,降低了钻具发生断裂的风险;内钻头通过齿轮啮合方式带动外钻头独立回转,相较于常规跟套管钻进能量消耗降低29.29%;外钻头采用高胎体交替式结构,有效避免了钻井液局部循环现象的发生,从而提高了套管连续下入的深度。该机构设计为跟套管钻进技术提供了一种新思路。  相似文献   

Sloped multi‐roller isolation devices for seismic protection of equipment and facilities          下载免费PDF全文

Shiang‐Jung Wang  Jenn‐Shin Hwang  Kuo‐Chun Chang  Chia‐Yi Shiau  Wang‐Chuen Lin  Mu‐Sen Tsai  Jia‐Xiang Hong  Yin‐Han Yang 《地震工程与结构动力学》2014,43(10):1443-1461

The rolling motion of mutually orthogonal rollers respectively sandwiched between two bearing plates in which one or both have V‐shaped sloping surfaces makes the sloped rolling‐type isolation device have an excellent in‐plane seismic isolation performance. In this study, the sloped rolling type isolation device in which a single roller moves between two V‐shaped sloping surfaces along each principle horizontal direction is refined by incorporating multi‐roller, built‐in damping, and pounding prevention mechanisms. The associated dynamic behavior is further clarified, and a simplified twin‐flag hysteretic model, which can be easily applied in most commercial computational tools is then proposed. Seismic simulation tests on the refined isolation devices (i.e. the sloped multi‐roller isolation devices) with different design parameters such as sloping angles of bearing plates and built‐in damping capabilities, together with a raised floor system by employing the sloped multi‐roller isolation devices, were conducted. Not only is the efficiency of the sloped multi‐roller isolation devices in seismically protecting the important objects, but also the practicability and accuracy of the proposed simplified numerical model in predicting the seismic responses of the sloped multi‐roller isolation devices is experimentally verified. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

金刚石锚杆钻头类型及其合理选择使用   总被引：3，自引：0，他引：3  

刘晓燕  李锁智  唐胜利  张斌 《煤田地质与勘探》2002,30(3):60-62

锚杆钻孔所遇岩层种类较多,合理地选择锚杆钻头类型有利于提高综合效益。本文介绍了金刚石锚杆钻头的类型、特点及选择方法,并给出了使用金刚石锚杆钻头的注意事项。   相似文献