Lessons Learnt from First Time Coiled Tubing Underbalanced Drilling Implementation in Adnoc Group of Companies

Meguid, Mohamed Osama Abd EL; Shahat, Ayman El; Sumaida, Ali Sulaiman Bin; Mutawa, Ahmed Abdulla Al; Saleh, Abdalla; Almazrouei, Saeed Mohamed; Mantilla, Alfonso; Yousfi, Fawad Zain; Baslaib, Mohamed; Ali, Abdulrahman Hasan Al; Hosani, Mariam Ahmed Al; Bairaq, Ahmed Mohamed Al; Mohamed, Ihab Nabil; Ojha, Aditya; Alawadhi, Fatima Omar; Solaiman, Tarek; Almteiri, Nama Ali; Bernadi, Bondan; Rangel, Pedro; Basha, Maged; Cui, Shuai; Jumagaliyev, Yerlan; Rennox, John

doi:10.2118/211521-ms

Day 4 Thu, November 03, 2022 2022

DOI: 10.2118/211521-ms

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Lessons Learnt from First Time Coiled Tubing Underbalanced Drilling Implementation in Adnoc Group of Companies

Mohamed Osama Abd EL Meguid

Ayman El Shahat

Ali Sulaiman Bin Sumaida

et al.

Abstract: ADNOC Onshore initiated a pilot implementation of Under Balanced Coiled Tubing Drilling technologies for Gas Reservoirs with this being the first time in the ADNOC Group of Companies. Detailed planning was carried out for this project implementation and the onward optimization for the 3rd well based on lessons learnt was carried out. This 3 well pilot Underbalanced Coiled Tubing Drilling, UBCTD, pilot campaign involves the sidetracking from a pre-drilled 6" hole and then drilling 3-¾" laterals w… Show more

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Planning and Execution of First Underbalanced Coiled Tubing Drilling in Adnoc´s Fields Utilizing First Successful Closed Loop System Globally

Osama

Sumaida

Shahat

et al. 2023

Day 3 Thu, May 25, 2023

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The Operator planned and conducted Underbalanced Coiled Tubing Drilling (UBCTD), operations on 3 wells in Operator Onshore fields targeting tight sour gas carbonate reservoirs. The objectives of these operations were to evaluate the applicability of the technology in these fields, to understand requirements and methods of the technology and to evaluate the benefits of drilling the target formations in an underbalanced mode. As a preliminary step, the Operator conducted a feasibility study that flagged potential limitations to deploying UBCTD operations in existing wells, due to limitations on the completion design and other factors. All of this resulted in the plan to drill fit-for-purpose wells to the top of the reservoir to facilitate the deployment of the technique. These wells were completed with 5.5/4.5 in. Tubing and 7 in. Liner and left with a 100ft open hole interval from where CT drilling operations would later continue. The results of the feasibility study notwithstanding, additional detailed engineering work was performed in all aspects of the design by the operations team to ensure the success of the trial, including a review and validation of the available data and the feasibility to deliver the stated objectives (lateral length, underbalanced conditions, minimal flaring operations, drilling fluid re-circulation, etc.). As a result of this approach, all three wells were successfully drilled in underbalanced conditions and to the target lateral length of 4,000 ft. Well placement was facilitated using Biosteering techniques and continuous monitoring of the well performance vs. drilled footage, allowing steering decisions to be made in real-time to maximize the production of each lateral, resulting in outstanding production results of 3x the productivity of similar wells drilled conventionally, (after stimulation). This paper will detail the design process highlighting key engineering decisions and assumptions taken during the design process and comparing them to the actual behavior of the well and the impact of real-life constraints on the operational parameters. The base design and lessons learned from the project will serve as a launching pad for planning and efficiency gains for future UBCTD operations.

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Planning and Execution of First Underbalanced Coiled Tubing Drilling in Adnoc´s Fields Utilizing First Successful Closed Loop System Globally

Osama

Sumaida

Shahat

et al. 2023

Day 3 Thu, May 25, 2023

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Case Study of Multilaterals Drilling in Under-Balanced Coiled Tubing Drilling (UBCTD) Implementation and Challenges for the First Time in Operator Group of Companies

Osama,

Sumaida,

El Shahat

et al. 2023

Day 2 Tue, October 03, 2023

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Under Balanced Coiled Tubing Drilling technologies is well proven technology that has been piloted for the first time in OPERATOR for Gas sour Reservoirs this being the first time in the OPERATOR Group of Companies, (UBCTD) technology has proven to be able to enhance the production rate greatly compare with conventional overbalanced technique. However, the UBCTD technology has a limit on the lateral length due to buckling and lock up of the coiled-tubing string. Multilateral drilling can overcome this limit and allow wells drilled by UBCTD technology have a comparable total lateral length with the conventional ERD wells. Detailed planning was carried out for the technology implementation there were many challenges in the operations, nevertheless, this is the first project of it is kind on the company, the lessons gained from daily challenging operation considered the stepping stone of the technology implementation in Abu Dhabi. This paper shall spotlight on the project challenges and learnings gained from well to another and how it helps to improve the well performance. The technique for multilateral drilling is characterized according to definitions established in 1997 during the Technology Advancement of Multilaterals (TAML) Forum held in Aberdeen. These standards classify junctions as TAML Level 1, 2, 3, 4, 5, or 6 based on mechanical complexity, connectivity, and hydraulic isolation. In UBCTD wells, the most common multilateral technology is with TAML level 1, which is done by open-hole sidetracks with barefoot completion. Plan set to perform the two open hole sidetracks from the main lateral hole to examine the UBCTD multilateral design philosophy for the first time using UBCTD technology and drill a multilateral well with 3 laterals, each of the lateral lengths around 4,000 ft. Comprehensive planning and simulations were done to overcome the challenge of different reservoir pressure, wellbore instability and open-hole sidetrack operations. The sidetrack and multilateral well were proved to be successful with flawless drilling without any NPT and greatly enhanced production of the well. No doubt that coiled tubing under the balanced technology pilot was extremely successful in all aspects, the paper shall describe all challenges and mitigations in addition spotlight on the best practice of planning and drilling a multilateral well in UBCTD during the execution phase and how it is impacted on project wells delivery. Body text 2 paragraphs.

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Step Change in CTD Strategy of Multilateral Drilling Using Under-Balanced Coiled Tubing Drilling (UBCTD) Technique in an Onshore Sour Gas Field-UAE-Case Study

Osama,

Sumaida,

El Shahat

et al. 2024

Day 1 Tue, March 19, 2024

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The Oil and gas industry is facing increasing demands that require new business models to sustain and maximize our resources to serve and support humanity's needs across the globe. The United Arab Emirates is seeking to become self-sufficient in gas supply by 2030. This has led the country to initiate several exploratory and appraisal projects to achieve this goal. This study covers one such pilot project targeting production from tight gas reservoirs in three wells through a coiled tubing (CT) underbalanced drilling (UBD) project in an onshore field. The technology directly serves the operator's visionary objective by sustaining production and meeting the energy mandates that would reduce the number of rig years. The Under Balanced Coiled Tubing Drilling (UBCTD) technology has a globally proven record of enhancing the production rate compared with conventional overbalanced techniques. The lateral length is limited due to buckling and lock-up of the coiled-tubing string, hence the multilateral drilling can overcome this limit and increase the well drainage compared to long horizontal sections. Implementing CTD with Multi-Lateral overcomes CTD limitation need for a single extended reach horizontal hole as conventional drilling, due CT lower Buckling limit, thus shorter lockup depth and reach in comparison with Conventional Horizontal Section. Detailed planning was carried out for the technology implementation and there were many challenges in the operations, nevertheless, this is the first project of it is kind for the operator company The lessons gained from daily challenging operations are considered the stepping stones for the technology implementation in Abu Dhabi. The technique for multilateral drilling is characterized according to definitions established in 1997 during the Technology Advancement of Multilaterals (TAML3) Forum held in Aberdeen. These standards classify junctions as TAML Level 1, 2, 3, 4, 5, or 6 based on mechanical complexity, connectivity, and hydraulic isolation. In UBCTD wells, the most common multilateral technology is with TAML level 1, which is done by open-hole sidetracks with barefoot completion. Comprehensive planning and simulations were done to overcome the challenge of different reservoir pressures, wellbore instability, and the absence of side-track operations history with CTD. Multilateral drilling with CTD proved to be successful, one UBCTD well completed, yielded gas production rates around two to three conventional wells. The UBCTD pilot was extremely successful in all aspects compared to the pre-set success factors as directed by the feasibility study that defines the following success criteria:Adhere to Healthy Safety and Environmental Considerations.Drill 4000 ft using CTD.Drill the well laterals completely underbalanced.Achieve a 1.6-2 times production increase compare to Conventional Well. This paper shall spotlight the project challenges and learnings gained from coiled tubing drilling (CTD) in all drilled wells and focus on a multi-lateral game plan to meet the project objectives.

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Lessons Learnt from First Time Coiled Tubing Underbalanced Drilling Implementation in Adnoc Group of Companies

Cited by 3 publications

References 3 publications

Planning and Execution of First Underbalanced Coiled Tubing Drilling in Adnoc´s Fields Utilizing First Successful Closed Loop System Globally

Planning and Execution of First Underbalanced Coiled Tubing Drilling in Adnoc´s Fields Utilizing First Successful Closed Loop System Globally

Case Study of Multilaterals Drilling in Under-Balanced Coiled Tubing Drilling (UBCTD) Implementation and Challenges for the First Time in Operator Group of Companies

Step Change in CTD Strategy of Multilateral Drilling Using Under-Balanced Coiled Tubing Drilling (UBCTD) Technique in an Onshore Sour Gas Field-UAE-Case Study

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