Weatherford jointly with the Drilling Operations Department of OJSC VCNG has successfully completed a pilot project of casing running with rotation in the Verkhnechonskoye oil and gas-condensate field.
The solution proposed by Weatherford was to use the OverDriveTM System and a special assembly of the casing shoe section. The shoe assembly consisted of a drillable casing reamer shoe that allows rock destruction to go through problematic spots of an open borehole and a float valve. SpiraGliderTM rigid centralizers were used to centralize the casing in the wellbore. The pilot project consisted of three 177.8 m OD casing running operations. The average measured depth of wells is approx. 2,750 m with approx. 2,000 m of horizontal displacement.
Technologies and equipment proposed by Weatherford made it possible to run the casings to the target depth in each of the three wells and reduce well construction time by 2 days, and it resulted in the Client’s costs saving.
Moreover, the OverDriveTM System’s outstanding feature is its safety for drilling operations. Thanks to its design the staff can control casing running while staying away from the rotary table. This system was also noted for reliable operation in low temperatures. During casing running in the two last wells the ambient temperature dropped down to –40°C and it had not any effect on successful operations.
The OverDriveTM System consists of a hydraulic clamping tool – TorkDrive – connected to the top drive of the drilling rig; it includes a fill-up/circulation tool, hydraulic bails, a control panel and a torque/turn monitoring system – TorkSub. The OverDriveTM System allows make-up of casing threaded connections and running it with rotation and mud circulation, and also drilling with casing.