高围压水射流破岩及冲击力测试装置优化设计

Optimal Design of High Confining Pressure Jet Impact Force and Rock Breaking Testing Device

为获取更多的工业油气流,减少油气对外依存度,国内油气资源探勘开发逐渐向深层推进。深井超深井建井过程中高围压下的低机械钻速增加了钻探成本,制约了深井超深井的发展。为此,对高围压水射流破岩及冲击力测试装置进行了优化设计。该装置能在0~60 MPa围压下,对0~350 mm喷距内的1~3只喷嘴产生的水射流冲击力和破岩效果进行测试。试验结果表明:在60 MPa围压下,水射流中心冲击力随喷距的增加而减小,水射流在同一水平面上的冲击力随距离增加而迅速衰减;随着围压由40 MPa增大至50 MPa,空化射流形成的破岩冲蚀坑直径逐渐降低,但降低幅度逐渐减小。该装置为研究深井超深井钻井提速提供了装备支撑。

To obtain more oil and reduce the dependence of oil and gas on foreign countries,the exploration and development of domestic oil and gas resources is gradually advancing to deeper formations.The low penetration rate under high confining pressure during deep and ultradeep well drilling increases the drilling cost and restricts the development of deep wells.In view of this,the high confining pressure jet impact force and rock breaking testing device is designed and optimized to allow measuring of water jet impact force and rock breaking performance generated by 1~3 nozzles in 0~350 mm jetting distance under the confining pressure of 0~60 MPa.The test results show that under the confining pressure of 60 MPa,the impact force of the water jet center decreases with the increase of the jetting distance.The impact force of the water jet on the same surface decreases rapidly with the distance away from the jetting center.Increasing the confining pressure from 40 MPa to 50 MPa,the diameter of the rock erosion pit by the cavitation jet gradually decreases with reduced decreasing rate.The device provides equipment support for studying the penetration rate increase of deep well and ultradeep well drilling.