NIC developing guidelines for composites in downhole oil and gas

IOM3 Content Cafe
25 Jun 2020
Plastic pipes. Credit: TWI

International organisations TWI and DNV GL have come together under the Non-metallic Innovation Centre (NIC) to address the challenge of corrosion in downhole tubing and casing applications in the oil and gas industry.

Fibre reinforced polymer pipes can provide a solution because they are corrosion free and offer a  higher strength to weight ratio when compared to metallic pipes, smoother bore that reduces rig capacity requirements, and the potential to be spoolable. 

TWI and DNV GL have identified that the main barrier to the use of polymer pipes is the lack of rigorous design and qualification practices. Therefore, the NIC has established a TWI – DNV GL collaboration to jointly develop the first industry guidelines for the design and qualification of composite tubing and casing for downhole oil and gas applications.

The guidelines will build on design pyramid practices developed in DNV GL composite standards such as DNV GL-ST-C501 and DNVGL-ST-F119.  The design pyramid approach is a multi-scale modelling and testing scheme which includes testing at different scales and connecting them by models.  It has been successfully developed and tried in DNV GL-ST-F119 for Thermoplastic Composite Pipes (TCP) with multiple TCP products already fully qualified and in service.