Abu Dhabi National Company for Onshore Oil Operations (ADCO) is expanding their operation in terms of increasing the production quota by drilling more wells with working over the existing wells. Therefore, the demanding to increasing rig fleet and activities is one of the important milestones in Drilling Division in ADCO. It is very critical and complex challenging to mobilize and start up with new drilling rigs. This process have an impact of a high cost and risk to any Oil and Gas company's business, so all the mitigations and risks should carefully be observed, taken and planned ahead prior each stage of ADCO New Rigs Start up project.

Three main stages are considered after defining the specifications of the required drilling rigs. They are (1) construction, (2) commissioning and (3) start-up. Different risks and Challenges involved in each stage of the ADCO New Rigs Start up project process such as delays during any stage of the project which have a great impact on delivering the rigs as per the planned frame work therefore, delays in delivering the company business plan.

This paper will express the challenge of having delays causing high impact in company business plan, however, the higher risk is always safety related. In addition of illustrating safe start-up is always considered the priority and focus through all project stages for achieving Zero-Harm target.

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