Composite Casing Drilling with High Strength Composite Tubular (HSCT)

Akiet started out with the vision of enabling the use of much lighter drilling equipment in a quest to reduce the complexity and cost of deep-drilling. The size of the drill rig is determined by the largest suspended hook-load on the rig which is that of the casing. For every 1000 meters of drilling steel casing of 9 5/8”would typically weigh 60 tons. If it is replaced by High Strength Composite Tubular the maximum hook-load becomes that of the drill string of about 25 tons per 1000 meters. If it were possible to drill with the High Strength Composite Casing the maximum suspended hook-load drops to no more than 9 tons per 1000 meters.

This causes a paradigm shift when considering the way in which wells are developed. The size of the drill rig and ancillary equipment becomes much smaller. The surface foot-print of the operation drops, power consumption and noise emissions are minimised and total impact on the environment is reduced by a factor.

Direct costs relating to the drill-rig and mobilisation/demobilisation can be more than halved and permitting procedures will be less cumbersome.

For these reasons Akiet has developed Enhanced Composite Casing Installation (ECCI) in partnership with Huisman Well Technologies of The Netherlands. The system is made up of a combination of casing drilling and rotary steerable technology, which ensures a very low risk drilling system. ECCI is an innovative retrievable casing installation system that allows (directional) drilling and installing casing simultaneously while keeping the freedom to change BHA components mid-section if needed or at TD with a minimum of pipe handling involved.

The ECCI system offers a unique see-through shoetrack section that allows logging tools (M&LWD) to remain inside the casing while still being able to make measurements. Compared to existing Casing While Drilling technology this enables a minimum stick out below the casing and keeps the bit to reamer distance close. This in turn results in improved stabilization of the assembly and optimum drilling performance.

Often in drilling operations considerable time is spent on reaming, clean out runs and trips to condition the hole prior tunning the casing. ECCI minimizes the time that the hole stays open as it is cased off immediately after it was drilled. ECCI allows the operator to be in control by eliminating many possibly NPT causes.

Even without hole problems ECCI allows for a better drilling performance due to reduced flat times between sections and safer operation because no unnecessary handling occurs.

The benefits of the system include:

  • Lighter drilling equipment
  • Lower daily rates
  • Lower mobilisation and demobilisation costs
  • Reduced drilling time due to elimination of tripping and casing installation
  • Continuous protection of well
  • Continuous logging through casing while drilling
  • Ability to deviate in controlled fashion


Akiet’s care for Quality, Health, Safety and the Environment stretches much further than our premises.

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