The first phase of steam flood development has been successfully implemented in a Petroleum Development Oman (PDO). The oil producer wells are completed with a single mechanical barrier as they are classified as low risk (not having a potential to self-flow to surface as the target formation is under pressured). However, in the later stages of development, steam break through into the producer occurs and must be managed to maximize production and increase recovery rates. To avoid gas-lock of the production pump, a fluid level is maintained in the wellbore by producing the steam up the production annulus, a production strategy referred to as casing venting. Implementing this strategy causes the producer wells to be capable of self flowing if steam injection is maintained. A well capable of self flowing to surface is classified as medium risk and requires two barriers.

For phase 2 of the project, expansion of the field to the North and South, the producer wellheads will have a Hydraulic Surface Annulus Safety Valve (H-SAS) system installed in the VR profile on either side of the A-anulus (right & left) as the primary barrier. The SOV's (Side Outlet Valve) will be the second barrier.

The H-SAS system was developed to assure and enhance annulus integrity. As part of the capabilities, the utilization of this safety device allows pressure management and operational venting within the annulus while providing a barrier in the event of an incident. The new wellhead design will meet the well compliance requirements and also allow for casing venting during operation.

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