DrillWell paper in Journal of Petroleum Technology

25.05.2015

A paper by DrillWell PhD-student Fatemeh Moeinikia at University of Stavanger, "Probabilistic Cost and Time Estimation of Rigless Plug and Abandonment", was reproduced in the January edition of Journal of Petroleum Technology.

High demand for plug and abandonment (P&A) of subsea wells in the forthcoming years on Norwegian Continental Shelf challenges industry to look for alternatives and vessel technologies that make P&A operations more cost effective and release time of semisubmersible rig earlier.

Light well intervention vessels (LWIVs) currently can take over some parts of P&A operations. This releases time of semisubmersible rigs and decreases cost associated with P&A operations. In this paper, potentials and experiences of LWIVs for P&A and benefits associated with them are discussed.

The P&A work of a single well can be separated into three distinct phases:

1) reservoir abandonment
2) intermediate abandonment
3) removal of the wellhead and casing strings a few meters below seabed, see Oil and Gas UK (2011).

In addition to performing preparatory work for Phase 1 such as killing the well, punching the tubing, circulating heavy fluids down tubing and up annulus, securing the well by temporary plugs and pulling the X-mas tree, and completing Phase 3, experience from UK reveals that LWIVs can also be used for completing Phase 2, setting the surface barrier. In this paper, an example case is considered wherein a new technology is deployed from a light well intervention vessel to set surface plug in P&A operations.

In addition, given the large number of wells required to be abandoned in the near future, there is a need for discussing how to structure the cost and time estimation for large field campaigns. It is then shown and discussed how to implement the classification proposed in ‘‘Guideline on Well Abandonment Cost Estimation’’ Oil and Gas UK (2011) to obtain a more realistic picture of duration for the multi-well P&A operations.

Here you can read the complete Article:
https://www.onepetro.org/conference-paper/SPE-169203-MS

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