[咨询求助]卡钻事故诊断 [复制链接]

[    post][/post]卡钻事故诊断
起钻时发生卡钻事故的诊断
起钻时发生卡钻事故的诊断                                            
判据        运行状态            卡  钻  类  型                        
                    粘吸    坍塌    砂桥    缩径    键槽    泥包    落物
卡   钻  前  各  种  显  示    钻具运行显示    钻柱静止时间较长            A                        
        钻柱上行突然遇阻                        A1    A1        A
        钻柱在一定阻力下可以上行                A1    A1            A    
        上提遇阻而下放不遇阻                        A2    A2        A
        上提遇阻下放也遇阻                A2    A2            B    
        循环活动正常停泵就有阻力                A3    A3                
        无阻力时转动正常                        B    B    B    
        无阻力时转动不正常                B    B                A
    井口显示    钻柱上行环空液面不下降                B    B            B1    
        钻井液随钻柱上行返出井口                                B2    
        钻柱内孔反喷钻井液                A                    
卡钻后各种显示    初始卡点位置    在钻头附近                        A        A    A
        在钻铤顶部                            A        
        在钻铤或钻杆部位            A    A    A                
    循环泵压显示    泵压正常            A            A    A        A
        泵压下降                                B    
        泵压上升                A1    A1            B    
        憋泵                A2    A2                
    井口显示    进出口流量平衡            A            A    A    B    A
        井口返出量减少                A1    A1                
        井口不返钻井液                A2    A2                
   注：1、A项为充分条件，据此可为卡钻事故定性。                                            
           2、B项为必要条件，可以帮助判断。                                            
           3、角码1、2、3表示三项可以同时存在，也可能只有一项或二项存在。                                            
                            
                                    

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