公开(公告)号：US20140048332A1

公开(公告)日：2014-02-20

申请号：US13587687

申请日：2012-08-16

Applicant: AXEL SCHMIDT ,  DUSTIN AASEN

Inventor： AXEL SCHMIDT ,  DUSTIN AASEN

IPC: E21B47/022

CPC classification number: E21B47/011

Abstract: A sealed mule shoe assembly for use in directional drilling, comprising an outer mule shoe and an inner housing for containing a directional measurement tool which is slidably insertable in the outer mule shoe. The mule shoe assembly advantageously has half-moon mating surfaces which advantageously allow use circumferential seals to thereby prevent ingress of abrasive materials into the landing area between the outer mule shoe and the inner housing, thereby greatly prolonging the life of the mule shoe assembly. Such seals further make use of hydrostatic forces downhole which cause locking landed engagement of the inner tool within the outer mule shoe. Cup seals or a check valve are used to allow escape of fluid when the inner tool is inserted within the outer mule shoe, and similarly prevent ingress of abrasive fluids and drill cuttings into the area of landed engagement.

Abstract translation: 一种用于定向钻孔的密封骡子鞋组件，包括外部骡子靴和用于容纳可滑动地插入外部骡子鞋中的方向测量工具的内部壳体。 骡鞋组件有利地具有半月配合表面，其有利地允许使用圆周密封件，从而防止研磨材料进入外部骡子鞋和内部壳体之间的着陆区域，从而大大延长骡子鞋组件的使用寿命。 这种密封件进一步利用井下的静水力，这导致内部工具在外部骡子鞋内的锁定接合。 当内部工具插入外部骡子鞋内时，使用杯形密封件或单向阀来允许流体逸出，并且类似地防止研磨流体和钻屑进入着陆接合区域。