不同产地叶蜡石的传压特性  

Pressure-transmitting properties of pyrophyllites from different localities

作　　者：刘力 邵方源 罗玉财 武强 于建涛 于金平 王海阔 侯志强[3] 王超[3] 杨易侃 LIU Li;SHAO Fangyuan;LUO Yucai;WU Qiang;YU Jiantao;YU Jinping;WANG Haikuo;HOU Zhiqiang;WANG Chao;YANG Yikan(CNPC Engineering Technology R&D Company Limited,Beijing 102206,China;PetroChina Huabei Oilfield Company,Renqiu 062552,Hebei,China;College of Energy Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]中国石油集团工程技术研究院有限公司,北京102206 [2]中国石油华北油田公司,河北任丘062552 [3]浙江大学能源工程学院,杭州310027

出　　处：《金刚石与磨料磨具工程》2024年第4期433-439,共7页Diamond & Abrasives Engineering

基　　金：中国石油集团万米超深层油气资源钻完井关键技术与装备研究(2022ZG06);华北油田复杂井钻完井技术支撑与服务(CPET2022-JS-3244);中国石油集团工程技术研究院高温高压下PDC钻头切削齿破岩系统研制(CPET2022-10S)联合资助。

摘　　要：作为密封传压介质,叶蜡石已被广泛应用于实验室和工业的高压合成中。然而,叶蜡石中矿物成分的改变将影响其传压效率及密封性。本研究中在6×8 MN大腔体六面顶压机中完成4种不同产地叶蜡石在室温下的压力标定工作,并通过X射线衍射研究叶蜡石中矿物组成的变化对传压效率的影响。结果表明:叶蜡石中含有较高硬度的矿物(如水铝石、勃姆石、白云母和高岭石),可有效提升叶蜡石的传压效率;随着腔体压力提升,叶蜡石的传压效率逐渐降低,施加更高的实际加载力(油压)也不能明显地提高腔体压力;高压处理后的叶蜡石4比叶蜡石2有更好的传压效率,但受矿物成分变化的影响,叶蜡石4容易发生密封失效,而叶蜡石2有良好的弹性回复效果和密封性,能够稳定完成升压卸压过程。综合考虑传压效率和密封效果,叶蜡石2具有最佳的应用价值和经济效益。Objectives:Pyrophyllite,as a sealed pressure medium,has been widely used in high-pressure research for laboratories and industrial synthesis.A highly efficient pressure transfer medium can generate higher cell pressure at the same loading force.The use of a highly efficient pressure transfer medium reduces the risk of anvil rupture and produc-tion costs.Therefore,it is important to develop a suitable and efficient pressure-transmitting pyrophyllite.Methods:The pressure calibration of four pyrophyllites from different localities at room temperature was conducted in a 6×8 MN multi-anvil large-volume press.The relationship between loading force and cell pressure at room temperature was estab-lished.The influence of mineral composition changes in pyrophyllite on pressure-transmitting efficiency was studied us-ing X-ray diffraction.Results:By investigating the influence of mineral composition changes in pyrophyllite on pres-sure-transmitting efficiency,the results are as follows:(1)When achieving the same cell pressure,the required loading force for Pyrophyllite 4 is 10%lower than those for the other three pyrophyllites,indicating that Pyrophyllite 4 has the best pressure-transmitting efficiency.(2)As cell pressure increases,the relationship between cell pressure and loading force begins to deviate from linearity,and the pressure-transmitting efficiency of pyrophyllite gradually decreases.When the cell pressure exceeds 5.00 GPa,applying higher loading force does not significantly increase the cell pressure.(3)Higher hardness minerals(such as Diaspore,Boehmite)in pyrophyllite can effectively improve pressure-transmit-ting efficiency in the low-pressure stage(cell pressure 2.55-3.68 GPa).When the minerals in pyrophyllite undergo phase transformation to form new minerals with higher hardness(such as Muscovite and Kaolinite)in the high-pressure stage(cell pressure of 5.50 GPa),pressure-transmitting efficiency can be effectively improved.Conclusions:Pyrophyllite 4 has better pressure-transmitting efficiency than Pyrophyll

关 键 词：叶蜡石 传压效率 腔体压力 加载力 矿物组成 

分 类 号：TQ164[化学工程—高温制品工业]