BJ's Dyna-Coil Injection Systems Enhance Production

BJ Services has enhanced its well production services portfolio with Dyna-Coil capillary injection systems. BJ now offers effective artificial lift technology that uses small diameter capillary strings through well tubing to feed specialty chemicals, water and solvents to enhance production. The capillary strings can be run to depths of 22,000 ft (7,000 meters). Custom software is used to help operators select the most appropriate wells for these applications.

To-date, more than 7,000 capillary strings using Dyna-Coil technology have been installed throughout Canada and the USA, including Alaska and the Gulf of Mexico. This technology has helped operators to maintain production and increase recovery from mature fields, particularly in low-pressure gas reservoirs. This emerging technology represents the first step toward changing methods of artificial lift for offshore wells.

One unique capability is the InjectSafe wireline retrievable or tubing retrievable SCSSVs (surface-controlled subsurface safety valves). Both designs allow operators to feed chemicals through a capillary system without violating the integrity of the SCSSV. "By using this system offshore we can economically treat wells subject to a number of production-related issues," said Umberto Micheli, region manager-Europe and Africa for the Well Services Division. "For example, wells with liquid loading, salting, scaling or hydrate problems can now be treated with precision, at the perforations, without pulling the tubing to install a capillary string," he said.

Production Increased Dramatically

Every offshore well employs surface-controlled subsurface safety valves (SCSSV). Although they are critically necessary, SCSSVs pose challenges when well remediation operations are being carried out. By using InjectSafe technology, BJ technicians can simply and economically inject specialty production chemicals in a well. This system can significantly enhance production by increasing total recoverable reserves without compromising well safe.

Using capillary strings in conjunction with the InjectSafe safety valve technology can produce impressive production improvements in gas wells suffering from liquid loading. The first installation yielded an impressive increase in gas production from 120 mscfd to 1.35 mmscfd.

A Variety of Applications

The InjectSafe system can be used to inject a variety of chemicals that benefit production. Surfactants and foamers can be used for deliquification in gas wells. Chemical inhibitors can be injected to protect tubulars from corrosion and scale deposits, or to inhibit precipitation of salts, asphaltenes and paraffin in the tubing and SCSSV. By injecting de-emulsifying chemical at the perforations, emulsions are much less likely to form.

"Today's InjectSafe system provides well treatment choices that were not available until now," said Micheli. "By installing an InjectSafe capillary chemical injection system, a broad range of preventive treatments become available. Each can go a long way to dramatically improving production and well longevity," he added. Looking ahead, BJ predicts it will be carrying out chemical injection operations with Dyna-Coil and InjectSafe systems within the next few months on behalf of major operators in the North Sea offshore market and in Continental Europe.