BJ Services installs chemical injection system in North Sea wells

BJ Services Co. has installed the first InjectSafe chemical injection system with DynaCoil capillary injection strings in two wells in the North Sea.

Offshore staff

ABERDEEN, UK -- BJ Services Co. has installed the first InjectSafe chemical injection system with DynaCoil capillary injection strings in two wells in the North Sea. Installation of the InjectSafe and DynaCoil systems allowed the company to inject foaming agent directly downhole through the capillary string, without compromising the integrity of the surface-controlled subsurface safety valve (SCSSV). The foaming agent, which foams condensate produced from the well, prevents liquid from accumulating in the well and enables production to flow continuously, resulting in an increase in overall gas production rates, the company says.

The InjectSafe system allow wells to retain SCSSV integrity and operability by preserving the existing control line function, while allowing injection of fluids directly to the wellbore below the SCSSV. The system is run in conjunction with DynaCoil capillary injection tubing using specially engineered capillary tubing equipment. The equipment is designed specifically for running small-bore tubing into wells and features a small wellsite footprint to reduce impact upon other platform operations.

The system allows effective downhole treatments by enabling the installation of small diameter capillary strings within the production tubing to apply specialty treatments to enhance production without compromising the capability of the SCSSV. The capillary strings can be run to depths of 22,000 ft (7,000 m).

“By installing this system offshore we can economically treat wells prone to production-related issues such as liquid loading, salting, waxing, scaling, and hydrate problems,” says John Anderson, BJ Services’ region VP for Europe and West Africa. “These conditions can now be treated without pulling the tubing to install a capillary string, which would be a more expensive and time-consuming option,” he adds.

10/15/2009

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