Oil and Gas Operator
Norway, Barents Sea
A conventional relief well approach with active ranging and triangulation of the target well proved to be extremely challenging. This is because a potential blowout from a shallow reservoir and a shallow set casing means that the relief well will have to be drilled directly to the target with a high attack angle (direct approach).
For shallow set casing, Add Energy recommended to magnetize a predetermined number of joints at the end of the casing string to create a strong electromagnetic field for passive ranging purposes.
As the shoe track casing joints need to be prepared and ready before magnetizing can commence, there was a limited time window for getting the job done before the casing was shipped offshore. In addition to this, Add Energy were up against the effects that COVID-19 is currently having on our society, specifically relating to travel restrictions.
Add Energy conducted a Blowout and Kill Simulation study to identify the blowout potential and kill requirements as well as the feasibility of a relief well.
The study concluded that for a potential relief well, the depth window from the seabed to the 9 ⅝ʺ liner shoe will be limited, adding constraints in terms of ranging methods. To enable passive ranging required for the well, Add Energy recommended and implemented the pre-magnetization of the casing (9 ⅝" liner) shoe track to be used in the target well.
The job required:
The coil was moved along the full length of the casing and electricity was sent through the coil at each step.
The magnetic field strength of the casing was measured before and after the magnetization procedure, demonstrating the effect on the magnetic field strength of the casing joint.
By magnetizing the shoe track casing joints:
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