Author: Adam Miszewski
Many wells drilled with underbalanced coiled tubing drilling (UBCTD) require a casing exit system to create a window in the original well through which the drilling BHA can pass to drill the sidetrack. Casing exits can be carried out using whipstocks set on coiled tubing, workover units or drilling rigs. Whipstocks are available for both monobore and through tubing applications on coiled tubing. There are two common methods for setting a whipstock on coiled tubing – either as two runs, one for the anchor and one for the whipstock, or in a single run where the whipstock and anchor are run together and oriented using an orienter. When exiting a vertical, or near-vertical wellbore, both systems require a gyro to be used to take an azimuth survey of the whipstock orientation due to the magnetic interference inside the casing. In the case of the single trip system, this means that the gyro must be integrated into the BHA but for the two-trip system a wireline truck could . . .
We want to provide a source of useful information to help you in your job and provide general interest. From working in the upstream O&G industry for over 25 years, we wanted to find a platform to informally share our insights and experience in the hope of inspiring more people to actively take part and learn more about a fascinating industry
To keep up to date, enter your email address here
. . . from the team at AnTech
© AnTech. All rights reserved.