Marwell AS utilize H.P. Wellscreen’s premium ‘PoroLock’ screen technology in a groundbreaking ‘chalk screen’ application in Norway.

H.P. Well Screen PoroLock jacket during torque testing


In a field which has been producing since the early 1980’s a major operator in Norway has had several challenges with chalk production. The reservoir characteristics of very high porosity and natural fractures have caused severe problems with chalk instability and influx throughout the years, leading to well failures. In these cases, production has been halted by chalk ingress causing blockages in the production tubing. In the most extreme cases, due to heavy reservoir compaction and formation influx, it has resulted in liner collapse and terminal well failure. In an effort to mitigate some of these challenges and extend the production life of the field the operator was considering to run a screen lower completion in March 2020.


Marwell AS, working together with our partners H.P. Well Screen in The Netherlands designed a fit for purpose chalk screen design which was tailor made for the reservoir characteristics. This solution was designed, manufactured and delivered in Norway in record time.

The screens were specially made mesh screens with a control layer which was optimised with the unstable chalk in mind. The screens were designed with a high collapse rating which was beneficial for this application due to the likelihood of formation collapsing around the screen jacket. It was anticipated that the screens would be rotated while running in hole so they were designed to maximize the torque rating of the jacket. The chalk screen was also designed to optimize the base pipe perforation and to maintain the base pipe strength. The chalk screens were installed with bonded-to-pipe composite centralizers to reduce friction when running in hole. As the chalk formation is unstable it was anticipated that the screens may require rotation in order to reach TD successfully. With this in mind, a torque test was conducted on the screen jacket during the planning stage to identify the ultimate torque capability of the jacket. This information was then used to determine the operational parameters for the screen running offshore.









The screens were run successfully to TD as planned. Stringers were encountered in the wellbore and the string was worked down with 25-34 kNm of torque, 5-20 MT of weight and 10 rpm. The bespoke screen design was then utilized for the next well in the field and has been identified as a technology for potential applications in the future.



Marwell is an independent company specialising in wellbore construction and completion equipment. Established in 2019 in Stavanger, its goal is to bring new and innovative tools to markets where they are not yet available. Collaborating with some of the industry’s leading suppliers and service companies, Marwell’s expert engineering team further develop field proven technology to deliver unique and tailored solutions.


Saving operators time and money, while also improving performance, Marwell’s speciality lies in its well-first thinking, offering a bespoke approach to ever-more complex problems. Its key products include: Composite Centralizers, Casing Equipment, Sand Control and Downhole Monitoring. Marwell has offices in Stavanger and a dedicated installation facility in Dusavik, Norway. For more information on Marwell AS visit

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