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| 1 | Viscosity testing method of ultra-low temperature drilling fluids for polar glacier drilling显示文摘According to the working environment of the polar glacier core drilling,a separatory funnel capillary viscometer which can be used for testing the viscosity of liquids under ultra-low temperature conditions was designed. This viscometer has a simple structure and it is easy to operate,which can meet the testing requirements of different temperature conditions.The viscosity of the dimethyl silicone oil KF-96L-2.Ocs was measured under different temperatures using this designed viscometer,and it is found that the viscometer coefficient K changes linearly with temperature.This testing method has relatively high test accuracy and its relative error is less than 4%,which can be used to test the viscosity of the different liquids in ultra-low temperature conditions. | HAN Lili XU Huiwen CAO Pinlu YU Dahui P.G.Talalay | 2012 | Global Geology2012，15，4： | 4 |
| 2 | Research and development on foam breaking and recycling technology in air-foam drilling显示文摘In recent years,air-foam combining the advantages of both liquid and air drilling has been utilized as a drilling medium. Air-foam drilling has proved its efficiency in numerous situations where serious problems were encountered,such as in fractured formations and depleted or high permeable zones. However,the major disadvantage of air-foam drilling system is that the foam can only be used once,so that an extremely large pit is required to contain the foam to allow sufficient room for cuttings and for the foam to dissipate. Moreover,it needs enormous volume prepared,consuming abundance of water and ingredient additives,which results in the high cost of foam drilling. The recycling foam fluid by using foam breaking technology is the only effective method to solve these problems associated with the known foam drilling. Various types of equipment and technique have been employed to suppress foam formation in biological and process equipment in foam drilling. The study described various methods of foam breaking technology,and the trend of the foam breaking technology for foam drilling is discussed. | CAO Pinlu ZHANG Jincheng WU Xia HUANG Jinyun | 2009 | Global Geology2009，12，4： | 2 |
| 3 | Low-molecular-weight, fatty-acid esters as potential low-temperature drilling fluids for ice coring显示文摘 | Xu Huiwen Han Lili Cao Pinlu | 2014 | Annals of Glaciology2014，68，： | 1 |
| 4 | Experimental in- vestigation of cutting temperature in ice drilling显示文摘 | Pinlu Cao Baoyi Chen Chunpeng Liu | 2015 | Cold Regions Science and Technology2015，116，： | 1 |
| 5 | Experimental study of the drilling process in debris-rich ice 显示文摘 | Pinlu Cao Cheng Yang Baoyi Chen | 2015 | Cold Regions Science and Technology2015，120，： | 1 |
| 6 | Investigations of near-bottom air reverse circulation in non-pipe electromechanical ice drill technology显示文摘 | HU Zhengyi TALALAY P G CAO Pinlu | 2012 | Journal of Jilin University (Earth Science Edition)2012，42，3： | 1 |
| 7 | Low-molecular-weight, fatty- acid esters as potential low-temperature drilling fluids for ice coring 显示文摘 | I-Iuiwen XU Lili HAN Pinlu CAO | 2014 | Annals of Glaciology2014，55，68： | 1 |
| 8 | Study on drilling mechanism and optimization of percussion-extruding DTH hammer bit显示文摘The authors tested the percussion-extruding Down-the-hole(DTH)hammer bit with five different structures and mainly analyzed the drilling mechanism between conical bit and stepped bit.In addition,aiming at 'the pile effect' in combination with the advantage of stepped bit,we design a new cam spinning bit and test it outdoors.The result shows that using cam spinning bit can solve the problem of 'the pile effect',which can also obtain higher drilling efficiency than using conical bit in high confining pressure strata.It is characterized by novel structure and high drilling speed as well as good guiding,and it is significant for improving efficiency in percussion-extruding drilling technique. | LUO Chunhong ZHENG Zhichuan CAO Pinlu | 2009 | Global Geology2009，12，1： | 0 |
| 9 | Tooth arrangement design of retractable DTH hammer bit used for drilling while casing显示文摘Down-the-hole(DTH)hammer with casing while drilling(CWD)is a technology that has been proven to be able to alleviate many of the problems faced by complex formations.However,the drill bit is suffered from rapid wear,low drilling efficiency,and high energy consumption due to the unreasonable tooth arrangement and impact energy selection in drilling process,which affect the application effect of this technology.ABAQUS software was used for numerical simulation of rock breaking behavior under impact load with the single,three,and five teeth arrangement drill bit respectively,to improve the application effect and solve the aforementioned technical problems.Based on the calculated parameters of tooth arrangement,we designed a novel drill bit for hard rocks and provided a theoretical basis for the tooth arrangement of largediameter drill bits. | ZHANG Boyao CHEN Baoyi YANG Da BO Kun CAO Pinlu | 2023 | Global Geology2023，26，1： | 0 |
| 10 | Reliability analysis of retractable drill bit with air reverse circulation used for drilling while casing显示文摘Casing-while-drilling(CWD)with down the hole(DTH)hammer drilling technology has been widely used in unconsolidated formations,due to its advantages in protecting the borehole wall,excellent rock cuttings capacity,and fast penetration rate in hard rock.As an important component of the CWD system,the structure of the retractable drill bit needs not only to ensure to form stronger reverse circulation,but also to be expandable or retractable as needed,otherwise the drill bit cannot be lift and put down smoothly in the casing,and may lead to drilling accidents.This paper developed a new type of reverse circulation DTH hammer drill bit used for CWD drilling technology.The retractable performance of this type of drill bit is studied using ADAMS software.The results show that it is smoothly expandable and retractable as designed under the conditions of the weight of the bit(WOB)of 0.5–2.0 t and the rotation speed of 30–60 r/min.To investigate the reverse circulation effect of the drill bit,Fluent software was used to simulate the flow characteristic inside it.The simulation results indicated that it can form strong reverse circulation,and the entrainment ratio h can reach 9.5%. | WANG Minqi YIN Qilei CHEN Baoyi QI Bo BO Kun CAO Pinlu | 2023 | Global Geology2023，26，1： | 0 |
| 11 | Improvements of drilling fluid processing for cable-suspended electromechanical drills显示文摘Deep ice drilling in Polar Regions plays a key role in paleo-climate, microbiological and glaciological researches. For deep ice and subglacial coring the special purpose-built electromechanical cable-suspended drills with bottom-hole circulation are designed and explored. Used at present drilling fluid circulation systems are specified by very high fluid wastes during processing. Measurements in deep drilling projects in Antarctic and Greenland ice sheets showed that 25%-40% of the drilling fluid, pumped into the hole, is retrieved to the surface with cable and drill, and up to 45% of retrieved fluid goes to waste. This leads not only to increasing of the fluid consumption and cost of the project in general but also to severe contamination of air, surface and near-surface snow-firn layers at the drilling site. In order to reduce wastes and environmental impact, it is proposed to modify drilling fluid processing system by avoiding of evaporation and leakages of fluid as far as practicable. Drilling fluid is prepared and pumped into the hole according to predetermined program on semiautomatic mode, and volume and density of blended and pumped into the hole drilling fluid are measured continuously. Components of the drilling fluid are stored and mixed in the special closed containers equipped by pressure relief valves. Separation of drilling fluid from ice cuttings is carried out by two steps: firstly, fluid is separated with hydro extractor and then with thermal separator. To reduce the amount of removed drilling fluid with cable special squeezing collar is installed on the borehole mouth. All these arrangements are able to decrease drilling fluid wastes in many times. | YU Dahui Pavel Talalay XU Huiwen CAO Pinlu Mikhail Sysoev HAN Lili HAN Junjie | 2013 | Global Geology2013，16，2： | 0 |
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