中短半径造斜螺杆钻具在套管内的通过度  

Passing ability of medium/short-radius whipstocking screw drill tools inside casing

作　　者：陈祖锡[1] 唐雪平[1] 高志强 

机构地区：[1]石油勘探开发科学研究院,北京学院路100083

出　　处：《钻采工艺》1999年第6期7-10,共4页Drilling & Production Technology

摘　　要：套管内侧钻中短半径水平井，由于造斜率比常规的中半径水平井要高得多（１°／ｍ 以上） ；因此，结构弯角必然较大，这就提出了这种钻具在套管内能否顺利下入的问题。文中根据最小变形能原理对钻具在套管内下入过程中的变形进行分析，解决了变形过程中边界待定问题，并对１２０ 双弯螺杆钻具和９５ 双弯螺杆钻具在１７８套管内的下入作了验证和验算，证实了能量法分析的可行性和有效性，并将原方案的１２０ 双弯螺杆钻具改为９５双弯螺杆钻具，以适应在１７８ 套管内通过。Because build angle rates of sidetracked medium-short radius horizontal wells are higher than conventional horizontal wells with medium-long radius,their structural bent angles are very high.This paper analyses how the whipstocking screw drill tools easily trip in casing.On the basis of minimum deformation principle,deformation of the drill tools in casing is analysed,undetermined boundary problem during deformation is solved.Meanwhile,running of 120 and 95 double tilted screw drill tools in 178 casing are verified.The result shows 120 double tilted screw drill tools must be changed to 95 drill tools in order to easily pass through 178 casing.Feasibility and effectiveness of energy analysis method are also verified.

关 键 词：套管 侧钻 水平井 能量法 螺杆钻具 钻具 造斜率 

分 类 号：TE243[石油与天然气工程—油气井工程] TE921.207