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井下增压装置提高钻速机理与适用性 被引量:6

Mechanism and applicability of increasing drilling rate for downhole suppercharging device
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摘要 利用井下增压装置产生高压射流辅助钻头机械破岩是提高机械钻速的有效手段之一,现有井下增压装置可分为利用钻井液水力能量和钻柱振动能量2种增压方式。针对不同地层对井下增压装置输出压力要求和不同增压方式适用井深条件等问题,通过数值模拟和现场试验分析等手段,研究了地层岩石力学参数对增压射流破岩的压力要求,探讨了2种井下增压方式的适用条件。结果表明,在地层岩石的摩擦角为20°~50°、内聚力小于60 MPa、当井下增压装置输出射流压力达到100 MPa以上、喷距不超过10倍当量喷嘴直径时,增压射流具备直接破岩能力。钻柱减振增压集钻柱减振和井底钻井液增压为一体设计新思路,装置活动部件少,受井深、钻井液性能参数等影响小,井下最长工作时间已达230h以上,比利用钻井液水力能量的增压方式具有更宽的适用范围。 The use of downhole suppercharging device for generating high pressure jets to assist in drill mechanical cutting is an effective means to improve mechanical drilling rate.The existing downhole suppercharging devices have two kinds of pressure increasing modes,i.e.,utilizing hydraulic energy of drilling fluid and vibration energy of drill stem respectively.Aiming at the issues such as output pressure requirements of downhole suppercharging devices for different strata and applicable well depth conditions of different pressure increasing modes,numerical simulation and field tests were carried out to study the pressure requirements of stratigraphic rock mechanics parameters for pressure-increasing-jet rock cutting and explore the applicable conditions of both downhole pressure increasing modes.The results reveal that the pressure-increasing jet has an ability of rock cutting when the friction angle of stratigraphic rock is 20°-50°,cohesive force is less than60 MPa,the output jet pressure of downhole suppercharging device is greater than100 MPa,and the jet distance is no longer than10 times of equivalent nozzle diameter.A new design idea is proposed to integrate drill-stem vibration reduction and pressure increasing of drilling fluid at bottom hole.The device has a small number of moving parts,less affected by well depth,drilling fluid performance and other parameters,of which the maximum downhole working time has reached more than230 hours,showing a wider applicable field than the pressure increasing mode in use of hydraulic energy of drilling fluid.
出处 《石油学报》 EI CAS CSCD 北大核心 2015年第9期1141-1147,共7页 Acta Petrolei Sinica
基金 国家自然科学基金项目(No.51274235) 国家重大科技专项(2011ZX05021-001) 中央高校基本科研业务费专项资金(15CX05038A)资助
关键词 井下增压装置 高压射流 破岩 钻速 管路压耗 downhole supperchargting device high pressure jet rock cutting drilling rate pipe pressure loss
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参考文献7

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