Abu Dhabi Company for Onshore Oil Operations (ADCO), one of the major Oil and Gas producers in the United Arab Emirates embarked in a new challenge to drill and exploration well in a new field that had only one offset well drilled in the 1980's. ADCO planned to have a step change in how to manage risk, engineering and operations in order to enhance drilling performance and reduce non-productive time while maintaining the highest HSE standards. A detail risk management plan and engineering process was developed and the main drilling services were bundle for the most critical well sections 12.25Љ and 8.5Љ in order to guarantee seamless operations.The results of the implementation of this methology as well as the new initiative based on an active participation and cooperation between ADCO and the Drilling Service Company in all the phases of the well were outstanding and exceeded management expectations with regards to enhancement in drilling performance by optimizing ROP; reduction on NPT by reducing wellbore stability problems; ensuring high quality data acquisition; minimizing well cost.The excellent results achieved in this exploration well included safely drilling and in an efficient manner, considering that very limited historical data was available, the power of drilling services integration proven to be the foundation of success. Other important achievements were the use of the latest logging technology to extract the formation fluid from tight formations in an optimum time; without any doubt drilling the 8.5Љ section was the most challenging due to the expected concentration of H2S (~27%) with an increase of 2.3 times the ROP compared to offset wells; this was exceeding ADCO's expectations.The aim of this document is to describe how the risk management plan was integrated into the drilling program from the planning phase to the operation phase in combination with the technical expertise and drilling technologies fit to propose provided by the Drilling Service Company the knowledge and experience of the operator lead to develop specific solutions for the main risk and challenges of drilling this exploration well. The paper also describes how the use of the bundle service model which used to integrate all drilling services which became a key factor during the critical stages of the execution phase.
Well was drilled in Al Nouf field with the objective to support the pressure sustainability of multiple producer wells across SH formation based on MRC / ERD approach. This paper presents the challenges faced in planning and drilling of subject well with departure of above 15,000ft and soft landed above the reservoir and later drilled 8.5" hole section to total measured depth of above 37,605ft (11.642 km) with having horizontal section of above 20,000ft with directional difficulty index (DDI) of 7.541 using heavy casing design. Planning of this well commenced by meetings and collaboration with subsurface operation and reservoir team with the common objective of drilling a well of over 15,000 ft of departure and keep the well smooth for drilling long eMRC horizontal section. New technology was used with a common objective to achieve the goal and make trajectory smooth to provide max chance for lower completion to reach the max TD of the well. All the associated risks were highlighted and mitigated by proper planning and engineering analysis such as trajectory, collision risks, BHA, hydraulics and casing design. This eMRC/ERD well of above 37,605ft MD (4.12 ERD H:V ratio) is the first well in the region to successfully completed even with directional difficulty index (DDI) of 7.541 This paper will explain the innovative and novel approach of mitigating the challenges faced while drilling a complex well of 15,000ft departure and have an extended horizontal section of over 20,000ft with 8.5" drainage. A few challenges like drilling across the faults across horizontal hole section and collision risk at deviated and horizontal section were major concern but successfully catered with advanced engineering analysis and innovative technologies like torque reducer, turbo caser and swivel master etc. Results from this well have proven that having lower completion in MRC / ERD wells have significantly improved the well accessibility and well performance and enhanced the reservoir management and significantly reduced the field development cost. This paper summarizes the practice and technology used to successfully drill the MRC / ERD well in artificial island. The challenges and its mitigation explained in this paper will support the idea to plan and drill the well beyond the reservoir boundaries to gather more data and to enhance more production. Also, this paper will provide novel approach of having lower completion in MRC/ERD wells which helps to attain more control on injectivity / productivity of reservoir because of proper isolation by swell packers and have maximum well accessibility across ERD horizontal section.
This subject Well was drilled as water alternative gas injector in Al Nouf field to optimize and support the pressure sustainability of multiple producer wells across reservoir formation based on MRC / ERD approach. The well have high departure so in order to attain the subsurface targets the production casing needs to be extended. This paper will outline the planning and execution of successfully deployed the longest production casing in ADNOC Onshore well using hydraulically rotating shoe. Planning of this well commenced by meetings and collaboration with subsurface operation and reservoir team with the common objective of drilling a smooth section of over 16,473ft as tangent with max inclination of 83 deg. All the associated risks were highlighted and mitigated by proper planning and engineering analysis such as trajectory, additional wipers trips, collision risks, BHA, hydraulics and casing design. Inhouse research was done to find a quick solution to cater challenge in deploying long production casing down to section TD. A hydraulically operated reamer shoe was then selected to encounter the challenge with some risk mitigation in place. The 9 5/8" casing was successfully landed at the target depth of 16,473 feet and subsequently cemented. All the efforts of hole cleaning, dedicated wiper trip played important role in deploying long intermediate case to section TD. Utilization of rotating shoe played a significant role in clearing the ledges and tight hole due to challenging formation. Rotating shoe was the first deployment in the well where it was identified as a challenging well context and had limited regional experienced. Several previous cases casing being held up in the first run. Despite the fact that a wiper trip has smoothened the hole condition, the parameters that were captured during the running. The detailed analysis and operation feedback from casing running job and subsequent operation will be beneficial to provide other operators in assessing the minimum requirement and suitability of this technology utilization to overcome the drilling challenge. This technical paper will show the importance of this project, with the lessons learned, challenges and its mitigation explained in this paper will support the idea to plan and drill the pilot hole and data acquisition in re-entry wells efficiently with key cost savings also will lead to many more successful dual casings exits for future wells. Successful Deployment Of Longest 9 5/8" Production Casing Across Highly Deviated ERD Well
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