西南石油大学学报(自然科学版)
西南石油大學學報(自然科學版)
서남석유대학학보(자연과학판)
JOURNAL OF SOUTHWEST PETROLEUM UNIVERSITY(SEIENCE & TECHNOLOGY EDITION)
2014年
6期
160-167
,共8页
董学成%熊继有%王国华%秦大伟
董學成%熊繼有%王國華%秦大偉
동학성%웅계유%왕국화%진대위
数值模拟%动态载荷%工作频率%破岩机理%破岩效率
數值模擬%動態載荷%工作頻率%破巖機理%破巖效率
수치모의%동태재하%공작빈솔%파암궤리%파암효솔
simulation%dynamic load%working frequency%rock breaking mechanism%rock breaking efficiency
为了揭示振荡冲击器作用下的井底岩石破碎机理,用数值模拟分析的方法,研究了不同参数对破岩效率的影响,包括不同工作频率、不同循环动载和不同岩石类型,并分别对其进行了定量分析。结果表明,井底岩石的破碎分为3个区域:破碎区,损伤区和无损区,在振荡冲击器的作用下,井底岩石的破碎过程分为3个阶段:钻头的中心齿压碎岩石,边齿对岩石造成破坏,钻头旋转切削破碎岩石。井底岩石的破碎效率随着振荡冲击器工作频率的变化而变化,当工具的工作频率为16 Hz时,破岩效率最高,振荡冲击器的破岩效率随着交变动载荷峰值的增加而不断增加,当其峰值载荷超过10 kN之后,破岩效率增加比较缓慢,振荡冲击器的破岩效率随着地层岩石硬度的变化而变化。这对振荡冲击器的现场应用具有十分重要的指导意义。
為瞭揭示振盪遲擊器作用下的井底巖石破碎機理,用數值模擬分析的方法,研究瞭不同參數對破巖效率的影響,包括不同工作頻率、不同循環動載和不同巖石類型,併分彆對其進行瞭定量分析。結果錶明,井底巖石的破碎分為3箇區域:破碎區,損傷區和無損區,在振盪遲擊器的作用下,井底巖石的破碎過程分為3箇階段:鑽頭的中心齒壓碎巖石,邊齒對巖石造成破壞,鑽頭鏇轉切削破碎巖石。井底巖石的破碎效率隨著振盪遲擊器工作頻率的變化而變化,噹工具的工作頻率為16 Hz時,破巖效率最高,振盪遲擊器的破巖效率隨著交變動載荷峰值的增加而不斷增加,噹其峰值載荷超過10 kN之後,破巖效率增加比較緩慢,振盪遲擊器的破巖效率隨著地層巖石硬度的變化而變化。這對振盪遲擊器的現場應用具有十分重要的指導意義。
위료게시진탕충격기작용하적정저암석파쇄궤리,용수치모의분석적방법,연구료불동삼수대파암효솔적영향,포괄불동공작빈솔、불동순배동재화불동암석류형,병분별대기진행료정량분석。결과표명,정저암석적파쇄분위3개구역:파쇄구,손상구화무손구,재진탕충격기적작용하,정저암석적파쇄과정분위3개계단:찬두적중심치압쇄암석,변치대암석조성파배,찬두선전절삭파쇄암석。정저암석적파쇄효솔수착진탕충격기공작빈솔적변화이변화,당공구적공작빈솔위16 Hz시,파암효솔최고,진탕충격기적파암효솔수착교변동재하봉치적증가이불단증가,당기봉치재하초과10 kN지후,파암효솔증가비교완만,진탕충격기적파암효솔수착지층암석경도적변화이변화。저대진탕충격기적현장응용구유십분중요적지도의의。
A model was built to simulate the process of rock breaking,under the action of oscillation impacter.In this model, influences of different parameters on rock breaking efficiency were considered.Moreover,a quantitative analysis was proposed for different parameters,such as different frequencies,different cyclic dynamic loads and different kinds of rocks.Through the modelling and simulation using ABAQUS/Explicit,rock breaking efficiency was investigated in detail.The results indicate that the connected face of rock and bit appears in three distinct zones:the broken zone,damage zone and undamaged zone. Rock breaking process can be divided into three stages:center cutters of bit crushing rock,surrounding cutters of bit crush rock and rotary cutting.When the frequency is about 16 Hz,rock breaking efficiency gets the maximum value.Along with the increase of dynamic load,the depth of broken pit increased,when the dynamic load was larger than 10 kN,the rising trend of rock breaking efficiency slowed down.Different rock had different rock breaking efficiency.It is very helpful to the field application.