Patent ID: 11970930
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A circulating sub connectable to a downhole drilling assembly, comprising:
a circulating sub body section;
a member mounted to said circulating sub body section for selective movement between a closed position and an open position;
an opening and closing mechanism operatively connected to said member to move said member between said closed position and said open position;
a rotation sensor; and
an electronic control unit operably connected to said rotation sensor and to said opening and closing mechanism, said electronic control unit being programmed for placement into a first mode of operation and a second mode of operation, whereby in said first mode of operation said electronic control unit is programmed to move said member to said open position when said electronic control unit detects rotating drilling with said rotation sensor and to said closed position when said electronic control unit detects sliding drilling, and whereby in said second mode of operation said electronic control unit is programmed to maintain said member in said closed position regardless of rotation.