August 9, 2012
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№ 4 (April 2012)

Weatherford Successfully Completed a Pilot Project of Casing Running with Rotation

   Weatherford jointly with the Drilling Operations Department of Verkhnechonskneftegaz, OJSC, has successfully completed a pilot project of casing running with rotation in the Verkhnechonskoye oil and gas-condensate field.

By Dmitriy Priymachenko, TRS Manager, Russia, Weatherford, LLC; Nikolai Balaka, Operations Manager, TRS, Russia, Weatherford, LLC; Vladimir Shulga, Director of Drilling Operations Department, VCNG, OJSC; Vyacheslav Visloguzov, Drilling Manager, Drilling Ope

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   Geology of the Verkhnechonskoye field is characterized with unstable rocks (argillites) stretching 150-200 meters along the borehole. This factor stipulates the need for additional borehole reaming before running the casing. However, during earlier operations before the project, reaming had not always allowed running the casing to the target depth.  

   The pilot project consisted of three 177.8 meter OD casing running operations. The average measured depth of wells is approximately 2,750 meters with approx. 2,000 meters of horizontal displacement. The profile and borehole deviation of a well is shown in Fig. 1 and 2 (see below).

   The solution proposed by Weatherford was to use the OverDrive™ System and a special assembly of the casing shoe section.

   The OverDrive™ System (Fig. 3) 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 OverDrive™ System allows make-up of casing threaded connections and running it with rotation and mud circulation, and also drilling with casing.

   The shoe assembly consisted of a drillable casing reamer shoe (Fig. 4) and a float valve. SpiraGlider™ rigid centralizers were used to centralize the casing in the wellbore.

   On its sides the casing reamer shoe is equipped with cutters that allow rock destruction to go through problematic spots of an open borehole.

   Prior to casing running, process calculations were made to evaluate possibility of casing running with rotation.

   While implementing the pilot project, the casings were run through the argillites zone with rotation and mud circulation. Upon reaching the bottomhole the casings were rotated with circulation to clean the borehole before cementing.

   After works had been successfully completed in two wells, it was decided to run the casing in the third well without prior reaming. As a result, the operations were performed in full; no problems or difficulties occurred.

   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 two days, resulting in the client’s costs saving.

   Moreover, the OverDrive™ 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 minus 40 degrees Celsius and it had not any effect on successful operations.     

   OverDrive™ System application proved to be high-efficient in casing running under challenging conditions of the Verkhnechonskoye field.

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