Prior to initiating the project, all the necessary and required planning was done. Field engineers in cooperation with the SPT technical team came up with a solution to overcome the above-mentioned challenges.
It was agreed to utilize a window and watermelon mill in drift run prior to the Whipstock being set. As was expected, the perforating intervals caused tight spots that were polished with the mill up to 600m. Tubing 2 7/8”(ID 62mm) instead of drill pipe was used to transport and orient the whipstock. This contributed to solving the issue with the Gyro tool passage. SPT designed a fit for purpose shear pin with a low shear load so as to not exceed the tubing maximum strength capacity.
When the Whipstock assembly reached the desired depth, the following operations were performed
- Run casing collar locator inside the tubing to define the depth of the casing collar.
- Well surveying with GyroTracer HT.
- Orienting of Whipstock with GyroTracer HT.
- Establish reverse circulation
- Hydraulic anchor activating
- Shear transport pin
- POOH tubing and running gear
- Makeup milling assembly and RIH
- Casing window milling