Cantarelli, Elena (Schlumberger) | Ahmed, Mohamed Gamal (ADNOC Offshore) | Benny, Praveen Joseph (Schlumberger) | Al-Harbi, Ahmed Abubaker (ADNOC Offshore) | Ibrahim, Ahmed Mohamed (ADNOC Offshore) | Alhammadi, Yousef Ahmed (ADNOC Offshore) | Alzaabi, Mohamed Abdulrahman (ADNOC Offshore)
With the objective to reduce the well construction time, ADNOC Offshore drilling team pioneered for the first time in Nasr field the linerless casing design which consist of merging the 8-1/2-in section into the 12-1/4-in phase. To maximize the savings, it is essential to drill the linerless section in one bit run, as multiple trips would defeat the purpose of implementing the new casing design.
The additional complexity of the 12-1/4-in section, now extended and landing directly above the M B reservoir, posed extra challenges at the beginning of the trial which required several unplanned trips due to bit damage or stuck pipe; the severe stick slip and high torque impacted the steerability and the rate of penetration (ROP). The development of a solid strategy to flawlessly drill the 12-1/4-in section was essential to effectively reduce the well construction time and exploit the linerless design potential.
The following solutions enabled the resulting fast-paced learning curve: polycrystalline diamond compacts (PDC) bit with conical diamond element (CDE) inserts to enhance the durability of the cutting structure while drilling hard stringers in K formation; motorized rotary steerable system (MRSS) to supply extra torque to the bit and compensate for the torque limitation of drillstring and top drive; anti-sticking bottom hole assembly (BHA) replacing 8-in jar and drill collars with 7-in jar and 5-7/8-in heavy weight drill pipe (HWDP) to minimize contact area and the risk of differential sticking; oil-based mud and later high-performance water-based mud, instead of the standard water-based mud to improve wellbore condition in shale intervals for safer and faster tripping; 24/7 real time wellbore surveillance service to monitor torque and drag, hole cleaning, shock and vibration, and drilling performance.
From the first trial, the new developed strategy enabled the drilling of the 12-1/4-in section in one run, achieving more than 20% IADC ROP improvement over previous linerless sections. Stick slip was considerably reduced resulting in consistent steerability and good hole quality; the bit showed almost green dull condition; the oil-based and high-performance water-based fluids maintained the wellbore in excellent condition maximizing the tripping efficiency. Furthermore, the linerless design enabled additional saving on subsequent operations for example the 7-in production packer could be pre-made with the lower completion, thus eliminating a dedicated run of two days. This proved that the linerless casing design is doable and can potentially reduce the well construction time over conventional casing design by at least seven days. Such result is not only an important milestone for Nasr field, but also for other fields that in future may adopt the same design, enabling additional saving to the operators.
Sandvik Materials Technology, a subsidiary of the Sandvik Group, was awarded two contracts in the UAE to supply control lines for oil and gas projects. The first contract with an oil producer covers the supply of a complete package of materials, including control line tubing. The second contract with a service provider is for chemical injection applications in the Umm Lulu and Al Nasr oil fields in Abu Dhabi.
This seminar will teach participants how to identify, evaluate, and quantify risk and uncertainty in everyday oil and gas economic situations. It reviews the development of pragmatic tools, methods, and understandings for professionals that are applicable to companies of all sizes. The seminar also briefly reviews statistics, the relationship between risk and return, and hedging and future markets. Strategic thinking and planning are key elements in an organisation’s journey to maximise value to shareholders, customers, and employees. Through this workshop, attendees will go through the different processes involved in strategic planning including the elements of organisational SWOT, business scenario and options development, elaboration of strategic options and communication to stakeholders.
Decisions in E&P ventures are affected by Bias, Blindness, and Illusions (BBI) which permeate our analyses, interpretations and decisions. This one-day course examines the influence of these cognitive pitfalls and presents techniques that can be used to mitigate their impact. Bias refers to errors in thinking whereby interpretations and judgments are drawn in an illogical fashion. Blindness is the condition where we fail to see an unexpected event in plain sight. Illusions refer to misleading beliefs based on a false impression of reality.
ADNOC awarded a $1.36-billion dredging, land reclamation, and marine construction contract to the UAE’s National Marine Dredging Company (NMDC) for the construction of multiple artificial islands in the first phase of development of the Ghasha Concession. The Ghasha Concession comprises the Hail, Ghasha, Dalma, Nasr, and Mubarraz offshore sour gas fields. Under the terms of the contract, NMDC will construct 10 new artificial islands and two causeways, and it will expand an existing island (Al Ghaf). The project is expected to take 38 months to complete and will provide the infrastructure required to further develop, drill, and produce gas from the sour gas fields in the Ghasha Concession. ADNOC said in a statement that the artificial islands will, among other things, provide greater flexibility for extended-reach drilling compared to offshore rigs.
The Ghasha Concession comprises the Hail, Ghasha, Dalma, Nasr, and Mubarraz offshore sour gas fields. Under the terms of the contract, NMDC will construct 10 new artificial islands and two causeways, and it will expand an existing island (Al Ghaf). The project is expected to take 38 months to complete and will provide the infrastructure required to further develop, drill, and produce gas from the sour gas fields in the Ghasha Concession. ADNOC said in a statement that the artificial islands will, among other things, provide greater flexibility for extended-reach drilling compared to offshore rigs. They will also eliminate the need to dredge more than 100 locations for new wells.
Eni CEO Claudio Descalzi (center) signed heads of agreement with Oman’s oil and gas ministry and BP for possible exploration of Block 77, located 30 km east of the BP-operated Khazzan Field. Eni has added a suite of new exploration opportunities in the Middle East by signing agreements in the United Arab Emirates, Oman, and Bahrain, part of the firm’s campaign over the past year to gain a foothold in the world’s most prolific oil and gas region. Following Abu Dhabi’s first open-block licensing round last April, Eni announced 12 January two concession agreements with Abu Dhabi National Oil Company (ADNOC) in which the Italian firm will serve as operator with a 70% interest of the 8000-sq-km offshore Blocks 1 and 2, northwest of the emirate. The remaining 30% stake will be held by Thailand’s PTT Exploration and Production (PTTEP). The agreements call for Eni and PTTEP to spend $230 million for exploration as well as appraisal of two existing discoveries on the blocks.
Patrick Pouyanne, Total chairman and chief executive officer, and Sultan Ahmed Al Jaber, ADNOC Group chief executive officer, signed the agreement 11 November. French major Total and UAE state-owned Abu Dhabi National Oil Company (ADNOC) will jointly explore for gas on the 6000-km2 Ruwais Diyab Unconventional Gas Concession. Total has been granted a 40% stake in the concession along with operatorship, with ADNOC retaining 60%. The agreement calls for a 6-to-7-year exploration and appraisal phase followed by a 40-year development and production period. If exploration is successful, the companies plan for a staged development depending on UAE gas demand and export opportunities.
More than 80% of Abu Dhabi oil reserves are accumulated in the Thamama reservoirs. However, its source rock locations, thickness and richness distributions are not fully understood.
Thamama hydrocarbons were generated and migrated from different source rocks including Diyab, Rayda, Thamama dense and Shuaiba basinal facies, in addition to a contribution from the deeper Paleozoic, Silurian Qusaiba and the Pre-Cambrian Huquf source rocks.
The Oxfordian, Diyab high-energy Oolitic belts are prograding in westward direction, and have resulted in the development of Diyab intrashelf basin in west Abu Dhabi. At the end of the Kimmeridgian time, Abu Dhabi basin was tilted towards the east due to the opening of Arabian-Indian Suture. This tilting had completely shifted the high-energy Oolitic belts to prograde in eastward direction, which resulted in the development of Rayda source rock in east Abu Dhabi.
The Thamama dense layers were deposited during the highstand system tract, which allowed some organic matter to be preserved; especially in intervals deposited below the wave base. The Shuaiba basinal facies were deposited in an intrashelf basin that was surrounded by the Shuaiba shelf facies. This resulted in restricted water circulation and anoxic conditions. Such depositional environment is reasonable for source rock preservation.
The hydrocarbon generations from these different sources were mainly accumulated in a super-giant Paleo-structure that was located in the northeast onshore Abu Dhabi. This Paleo-structure was segmented by the Late Tertiary tilting, which resulted in remigrating its trapped hydrocarbon into the prominent Abu Dhabi fields.
The development of Rayda source rock will increase the potentiality of finding additional unconventional hydrocarbon resources in east onshore Abu Dhabi. The high unconventional potential in this area can be attributed to the advanced level of source rock maturity and to the highly faulting and fracturing found in east onshore Abu Dhabi. The Rayda source rock maturity map confined the unconventional gas potential to the foreland basin while the unconventional oil potential is located to the south of this area (
Understanding the locations of Thamama source rock kitchens will facilitate the delineation of its migration pathways. This will reduce the exploration risk and help in detecting prospective areas for stratigraphic traps potential along the Thamama migration pathways over all Abu Dhabi.
Yanez, Eglier (ADNOC Offshore) | Uijttenhout, Mattheus (ADNOC Offshore) | Zidan, Maher (ADNOC Offshore) | Salimov, Rail (ADNOC Offshore) | Al-Jaberi, Salem (ADNOC Offshore) | Al-Shamsi, Al Anoud (ADNOC Offshore) | Al-Sereidi, Amnah (ADNOC Offshore) | Amer, Mohamed Mostafa (ADNOC Offshore) | Al-Hammadi, Yousef (ADNOC Offshore) | Abdul-Halim, Abdullah (ADNOC Offshore) | Caletti, Giovani (ADNOC Offshore) | Adli, Mustapha (ADNOC Upstream) | Al-Hammadi, Yousif Hasan (ADNOC Upstream) | Al-Hosani, Fahad Mustafa (ADNOC Upstream)
Including "smartness" in your field does not necessarily add additional expenditures. ADNOC Offshore piloted a new well completion design combining Interval Control Valves (ICVs) in the shallow reservoir and Inflow Control Devices (ICDs) in the deeper reservoir, both deployed in a water injector well for the first time in the company. The objectives were to improve reservoir management, reduce well construction complexity and achieve one of the main business targets of cost optimization. This paper covers the subsurface study, detailed well construction design, completion deployment, well intervention and overall well performance in commingled injection mode.
A multi-disciplinary study was conducted based on updated reservoir data available after the first two years of production in a heterogeneous multi reservoir field. This study showed the possibility of replacing the upper horizontal drain by a deviated perforated section. The authors identified the need of completion compartmentalization to overcome challenges such as high reservoir heterogeneity and uneven pressure depletion enforced by non selective acid stimulation. As part of the evaluation, a simulation was performed to evaluate the expected injection performance across the four zones with different combinations of ICVs and ICDs in order to cater for different injection scenarios.
As a result of the integrated analysis, a new well completion design was deployed to optimize a Dual Horizontal Water Injector into a Single Smart Completion with 3 Inflow Control Valves (ICVs) covering the upper perforated zones and 14 Inflow Control Devices (ICDs) with sliding sleeves across lower lateral reservoir. Cost savings and reduction of rig time was achieved with this new completion design demonstrating very pro-active participation from all involved teams, ADNOC Offshore and Service Companies.
The requirements to complete high and low permeability zones in one single well can be successfully accomplished. Firstly, mitigation of early water breakthrough is achieved by incorporating surface water injection control in high permeable zones and secondly, the injection target for the low permeable reservoir is also delivered.
Building on the successful results and captured lesson learnt, this new well completion design provided the capabilities to optimize the water injection plan while reducing costs. Therefore, the project has passed the trial phase and the team proposed its implementation.