This course provides a fundamental understanding of process safety techniques and how applying these techniques can improve safety, equipment reliability, environmental performance and reduce overall costs. It presents an overview of the elements comprising process safety, practical examples and how process safety can be integrated into day-to-day operations. Working and studying abroad is a huge part of the oil and gas industry and despite the impact on a professional’s career and personal life, little guidance is available for those considering the big move. At this event, we will be sharing stories from those who have gone through the same process and explore some of the benefits and difficulties of diverse working environments. Sustainability means many different things to different people. For governments, it means ensuring development that meets the needs and aspirations of the present without compromising the ability of future generations to meet their own needs.
Africa (Sub-Sahara) Eni successfully completed a new production well in the Vandumbu field, 350 km northwest of Luanda and 130 km west of Soyo, in the West Hub of Block 15/06 offshore Angola. The VAN-102 well is being produced through the N'Goma FPSO and achieved initial production of 13,000 BOED. Production from this well and another well in the Mpungi field will bring Block 15/06 output to 170,000 BOED. Anglo African Oil & Gas encountered oil at the TLP-103C well at its Tilapia license offshore the Republic of Congo. The well intersected the targeted Djeno horizon, and wireline logging confirmed the presence of a 12-m oil column in the Djeno. Total started production from the ultra-deepwater Egina field in approximately 1600 m of water 150 km off the coast of Nigeria. At plateau, the field will produce 200,000 B/D.
The use of Lab NMR, MICP, electrical resistivity measurements and conventional core analysis coupled with petrographic investigations, enabled the authors to understand the pore structure of several carbonate samples and establish a link between pore geometries, Archie's cementation exponent, capillary pressure behavior and NMR T2 response. The lab work was performed on 68 carbonate plugs retrieved from 5 vertical wells completed on a Cretaceous carbonate reservoir, and located at different structural positions (from crest, mid-flank and down-flank areas), capturing different hydrocarbon column heights and, therefore, different degrees of diagenesis and porosity degradation. The equipment used was Magritek 2MHz NMR Rock Analyzer for the T2 distributions, Micromeretics for MICP, Pantera for the ambient resistivity measurements and PORG-200TM for the conventional core analysis. The petrography was done using conventional polarized light microscope. From the combined analysis of NMR T2 spectrum and electrical resistivity measurements we concluded that the magnitude of the Archie's cementation exponent "m" is greater when the samples exhibit variability within the largest pore class ranges (meso to macro scale) than on the smaller pore class range (micro to meso scale).
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.
Abu Dhabi Company for Onshore Petroleum Operations (ADCO) HSE policy is fully committed to the principle of sustainability, prevention of pollution, protection of the environment and conservation of natural resources. Thus, It is an important objective for minimum influence on the biodiversity and conservation areas by its operations. Preserving habitats is crucial to any biodiversity action planning strategy within the ADCO Concession Areas. Key habitats are central and indeed survival of many species, including some rare, endangered and protected species. ADCO Operation always care for the natural environment and everything which it contains.
The capacity for the storage of carbon dioxide in saline aquifers remains enormous. Of all geological storage media, it provides the best storage capacity. In this study, the potential of the Shuaiba Formation, in the Falaha syncline, for geologic sequestration is assessed. A regional geo-model was built using seismic and well data (logs, cores) from the Falaha Syncline and nearby fields. The model was built to honor the heterogeneity and sequence stratigraphy of the Shuaiba carbonate platform using a five-order hierarchical conceptual model of the Shuaiba formation that merged sequence architecture and reservoir architecture together. This was achieved by honoring lithofacies, facies association packages and rock types in their corresponding depositional settings in the sequence framework. Dynamic simulations were then conducted on an upscaled geological model using a compositional reservoir simulator to determine its storage and flow capacity, plume migration pathways and to understand the physics of the fluid flow in the aquifer. Simulations are made to be conservative thus accounting for structural/stratigraphic, solubility (dissolution in resident brine) and residual trapping without accounting for the slower mineral trapping process. Detailed sensitivity studies were conducted during the simulations to understand the effect of well parameters, rock and fluid properties amongst others on the storage capacity in the aquifer. Simulation results indicate that significant volumes could be stored in the aquifer and could take a significant amount of time before the injected gas reaches the surrounding hydrocarbon producing fields. This study provides the first full field approach to characterize and to quantify the suitability of the identified aquifer for long term storage of carbon dioxide in the subsurface of UAE.
Oil and Gas world is going through difficult times, with crude prices breaching some of the all-time low values. GASCO believes that, such situations call for extra ordinary efforts to control and extract best results out of every opportunity. Shutdowns/Turnarounds are such cost centric opportunities where careful and controlled actions can have significant effects on company bottom lines. This paper intends to portray the caution, controls and practices during Execution during Asab-0 Turnaround-February 2016, which enabled in producing extra ordinary results for GASCO. GASCO operates its Turnarounds (TA) based on a well-documented'Shutdown Manual', which has strong background in Maintenance Excellence practices on a well-defined process approach. In order to control the TA effectively, Key Result Areas (KRA) were identified and actions were put in place for lean management of the various elements involved. Principles of Systems Dynamics were used to integrate various functions, people and hierarchies to break down silos in communication. Each of the KRA's had elements of this approach in order to achieve performance up-scaling. The KRA's identified were: 1. Cost optimization - achieved through resource optimization (pooling; Seamless integration for optimal use of all available resources (human/equipment)), iterative/dynamic planning, adequate contracting strategy (Performance-based), integrative thinking approach (Minimal Compartmentalization) with stakeholders and early start up.
This paper aims at predicting the fracture system associated with the structural development of the Shah Structure in relation to a deep-seated basement fault. It discusses the possible geometry, frequency and fracturing modes, and the development mechanism of the fracture system revealed throughout a set of analog models, which emphasize the link between the basement fault and the sedimentary cover in a timely manner construction. A 3D seismic data was used to construct a series of systematic scaled analogue models to reconstruct the structural evolution of Shah Anticline in association with an oblique sinistral strike-slip movement along basement fault, which induced both a strike slip movement in-and shortening of the cover sand layers. The deformation that was made by moving one of the basement plates in an oblique slip along the basement fault, resulted in an open anticline (box fold), which resembles the Shah Structure. Analog modeling results presented here reveal that fractures associated with the asymmetric anticline have developed in different locations, and possessed different geometries and modes. As anticipated, both tensile and shear fractures have developed in different areas within both the crestal parts of Shah Structure and within its limbs. However, the asymmetrical geometry of the model-anticline is reflected in the fracture distribution, trend and frequency.
Tipu, Imran (Abu Dhabi Company for Onshore Petroleum Operations Limited (ADCO)) | Alawadhi, Eman (Abu Dhabi Company for Onshore Petroleum Operations Limited (ADCO)) | Kumar, R. (Abu Dhabi Company for Onshore Petroleum Operations Limited (ADCO)) | Amanov, Batyr (Abu Dhabi Company for Onshore Petroleum Operations Limited (ADCO)) | El Gebaly, Mohamed A. (Abu Dhabi Company for Onshore Petroleum Operations Limited (ADCO)) | Al-Hammadi, A. M. (Abu Dhabi Company for Onshore Petroleum Operations Limited (ADCO)) | Shamlan, A. M. Bin (Abu Dhabi Company for Onshore Petroleum Operations Limited (ADCO)) | Danche, Ali M. (Abu Dhabi Company for Onshore Petroleum Operations Limited (ADCO)) | Ganda, Sukesh (Schlumberger) | Dua, Rajan (Schlumberger) | Hariri, Nour (Schlumberger)
The introduction of a high build rate rotary steerable system (HRSS) capable of delivering in excess of 18°/100 ft DLS resulted in the expectation that this will lead to drilling more wells with higher DLS with RSS. While this paper is not to explore this expectation, it is obvious that this rotary steerable system (RSS) has been used by E&P Operators in the Middle East Region for so many different applications within the operating window of the other existing RSS system. This paper aims to explore in details the unique and ingenious applications, benefits and value of these HRSS systems to the clients in the UAE in terms of optimizing costs and improving drilling efficiency.
The traditional method of utilizing a motor for kick-off, sidetrack and exit whipstock was challenged and the broadened operating limits of HRSS were utilized to its full potential to find ingenious ways to perform such operation. The major benefits from these applications are a result of the ability to overcome challenging drilling environments or operational requirements. 22 jobs have been completed in the UAE from Q1, 2012 to date using the HRSS with 100% success rate across the range of applications described below:- Dogleg severity assurance in complex 3D trajectories or through incompetent formations. Kick-off from vertical in various formations with different comprehensive strengths. Cement plugs sidetrack from vertical and shoe to shoe drill ahead to section TD. Sidetrack from whipstock with15 ft rat hole and shoe to shoe drilling with full suite of logging tools.
Dogleg severity assurance in complex 3D trajectories or through incompetent formations.
Kick-off from vertical in various formations with different comprehensive strengths.
Cement plugs sidetrack from vertical and shoe to shoe drill ahead to section TD.
Sidetrack from whipstock with15 ft rat hole and shoe to shoe drilling with full suite of logging tools.
The increasing demand for this service and creation of a niche, even in the current environment of demanding cost optimization and value based technology, the application of this technology has led to an estimated saving in excess of 40 days. The non-tangible benefits include better hole cleaning and smoother wellbores leading to less wellbore tortuosity and improved ability trip post drilling with drilling, logging and casing assemblies. The asset teams are not left out as the near bit measurements in theses assemblies also aid in reduction of the uncertainties and enable better decision making, especially while landing the well or at TD point selection.
The applications of HRSS described in the paper are innovative applications designed through immaculate planning and risk mitigation. As a result of which significant achievements in cost optimization and drilling efficiency enhancement have been realized.
Mohamad, R. (Schlumberger) | Fadipe, O. A. (Schlumberger) | Zhang, X. (Schlumberger) | Djuraev, O. (Schlumberger) | MacGregor, A. L. (Schlumberger) | Bouhlel, A. M. (Schlumberger) | Koutsabeloulis, N. C. (Schlumberger) | Noufal, A. (Abu Dhabi Company for Onshore Petroleum Operations LTD) | Sirat, M. (Abu Dhabi Company for Onshore Petroleum Operations LTD) | Popa, D. (Abu Dhabi Company for Onshore Petroleum Operations LTD)
Prediction of pore pressure and porosity in an unconventional resource assessment area of Abu Dhabi was performed by using petroleum systems modeling techniques, combining seismic and well data and geological knowledge to model sedimentary basin evolution. The study objective was ultimately to reconstruct basin history and key geological structures as a basis for further geomechanical and fracture prediction studies. Twelve surfaces were interpreted from seismic data and derived from isopach maps. These maps were used to construct the basin model. The model was built from the top of the surface sediment down to the Shuaiba formation. Sediment decompaction was modeled, which enabled the reconstruction of the formation structures through time. Athy's law, formulated with effective stress, was used in the forward modeling simulator for the calculation of pore pressure. Information such as formation ages, erosional events, and hiatus periods were taken into account during simulation. The evolution of porosity, pore pressure, temperature, and thermal maturity through time were simulated and calibrated to measured data. Model porosity is dependent on burial depth, weight of the overburden sediment columns, and lithology properties. Porosity calibration was achieved by adjusting the compaction curve to effective stress. Pore pressure was calibrated by adjusting lithology porosity-permeability relationships. Low-permeability lithologies result in high pore pressure. A regional Paleocene pore pressure reduction was observed, caused by substantial erosion of the Simsima formation. Generally, formation overpressure is observed at greater depth. Additionally, modeled overpressures depend on the evolution of connate water vectors over geological time; these vectors depend on multiple lithology parameters as well as the capillary entry pressure of adjacent model layers. In the Shilaif fm, overpressure zones were identified at the anticlinal structures. Interestingly, higher overpressure was observed in the shallower anticlinal structure. The simulation results provide the estimated porosity and pore pressure in the unconventional play, as well as the reconstruction of the overall basin geometry through time. The resulting models were subsequently used as the basis for further fracture prediction studies; results were ultimately consistent with faults derived from existing seismic interpretation. Model porosity, pore pressure, and predicted fractures will be used for the development of static geological and dynamic reservoir models.