Abstract: A directional casing drilling system includes a casing string, a drilling rig and a retrievable Bottom Hole Assembly (BHA). The drilling rig includes a casing drive for rotating the casing string in the borehole, a control system for controlling the casing drive, and a mud pump for pumping a continuous flow of drilling mud into the casing string. The BHA includes a torque transfer section, with which it is secured in the casing string, and a drill bit section held in a drilling position in the torque transfer section. It further includes a mud drive that rotates the drilling position of the drill bit section about the longitudinal axis of the torque transfer section, and a communicating device for communicating the orientation of the drill bit to the control system. The BHA is steered by adjusting the rotational speed of the casing string.
Type:
Grant
Filed:
January 21, 2016
Date of Patent:
September 17, 2019
Assignee:
HUISMAN WELL TECHNOLOGY
Inventors:
Gerardus Godefridus Johannes Van Og, Pieter Dirk Melis Van Duivendijk, Joop Roodenburg
Abstract: A directional casing drilling system includes a casing string, a drilling rig and a retrievable Bottom Hole Assembly (BHA). The drilling rig includes a casing drive for rotating the casing string in the borehole, a control system for controlling the casing drive, and a mud pump for pumping a continuous flow of drilling mud into the casing string. The BHA includes a torque transfer section, with which it is secured in the casing string, and a drill bit section held in a drilling position in the torque transfer section. It further includes a mud drive that rotates the drilling position of the drill bit section about the longitudinal axis of the torque transfer section, and a communicating device for communicating the orientation of the drill bit to the control system. The BHA is steered by adjusting the rotational speed of the casing string.
Type:
Application
Filed:
January 21, 2016
Publication date:
January 11, 2018
Applicant:
HUISMAN WELL TECHNOLOGY
Inventors:
Gerardus Godefridus Johannes VAN OG, Pieter Dirk Melis VAN DUIVENDIJK, Joop ROODENBURG