Abstract
The paper introduces an application of intelligent completions that uses remotely operated barrier valves to improve completion efficiency. The case study outlines the completion of a well in the UK North Sea. The valves were used to set the packer and to test tubing; later, they functioned as shallow and deep-set barriers for the removal of the blowout preventer (BOP) and the installation of the christmas tree.
The well was completed with two barrier valves deployed in the open position; one was installed for use as a shallow-set barrier above the safety valve and the other as a deep-set barrier below the production packer. The valves used onboard decision-making electronics that monitor well conditions and that are programmed to open or close in response to the detection of a specified condition (known as a trigger). This configuration enabled the operator to communicate with the tool remotely from the surface by using applied-pressure commands. The use of remotely operated barrier valves made it possible to open and close the barriers multiple times.
The deep-set valve was initially closed to set the packer and test the tubing string. It was later opened to test the packer on the annular side, and it was closed to act as a deep-set barrier. The shallow-set valve was later closed to act as a second barrier to enable the removal of the BOP and the installation of the christmas tree. Both valves were then remotely opened to begin production.
The use of remotely operated barrier valves helped the operator to successfully eliminate eight wireline runs, which resulted in the elimination of approximately 59 hours of rig time. The health, safety, and environment (HSE) risks associated with rigging up and running wireline were also eliminated in this case.
The industry is striving to perform completions and intervention activities in a safer and more economic manner. This case study demonstrates the new use of remotely operated barrier valves will provide a timely addition to existing completion solutions.
