Sigmund Stokka, manager of DrillWell and Jostein Sørbø, IRIS

The annual DrillWell technical seminar - Day 2

25.09.2015

Sigmund Stokka welcomed the audience to the second day of the seminar and introduced Torbjørn Vrålstad as the chairman of this session.

Dr. Vrålstad is the program leader of Program 3, Well Solutions for Improved Recovery.

The first presentation “Leakage rates through degraded cement sheats” by Ragnhild Skorpa, showed new results of potentially high value to the industry with respect to zonal isolation. For the first time we have been able to see what the flow channels in degraded cement sheats looks like, using a X-Ray computed Tomography (CT). Cracks in cement sheats are developed when the cement is exposed to thermal cycling. When using the CT-scanner, and through experiments performed at SINTEF Petroleum’s lab in Trondheim, a 3D model of the degraded cement with flow channels have been created, and leakage rates have been calculated for the sample.

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In the second presentation by Jostein Sørbø, “Tubing left in hole with control lines” was the theme. Three phases of full scale experiments have been performed at IRIS in 2013, 2014 and 2015. In all tests, a production tubing with and without control lines was cemented into a casing to explore whether the tubing can be left in a well and still provide a good barrier. Both expandable and regular cement was being used. After cementing, the casing with the tubing was cut into samples. The experiments show that no visible channels or empty pockets where found at any sample, both with and without control lines. In experiments with expandable cement, leakage through micro-annuli was calculated when pressurizing the samples, and leakage rates was measured. One important finding is that the control cables does not represent a risk for leakage path.

In the third presentation, Lars Hovda from ConocoPhillips presented challenges related to P&A on Ekofisk. There is limited access to offshore rigs that are particularly suitable for P&A operations, and this is an obstacle to perform efficient operations. In addition, there are other issues with the Ekofisk wells and formation that puts certain requirements to choice of equipment. Hole cleaning when milling is also a big issue. Today, the average time is around 50 days for a complete P&A. ConocoPhillips work actively with vendors to develop new methods and technology to reduce the costs associated with P&A. A paper on P&A recommended by Lars Hovda is SPE 148640 (By Thomas Ferg et. al.).

After the lunch break, three PhD students presented their recent work. PhD student Mahmoud Khalifeh talked about “Cap rock restoration in P&A operations; possible utilization of geopolymers for permanent zonal isolation and well plugging”. PhD student Fatemeh Moeinikia followed up with “A study of possible solutions for cost efficient subsea well abandonment”.
Reza Askarinezhad held the seminar’s last presentation, on “Disproportionate permeability reduction of water-soluble silicate gelants – Importance of formation wettability”.

The feedback from the audience in the wrap-up after the sessions indicates that DrillWell is well on track. The coming phase 2 of DrillWell is also well achieved, and in particular, the focus on risk evaluation related to P&A in which the industry see a large potential.

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