Chullabrahm, Pattarapong (PTT Exploration and Production Public Company Ltd) | Saranyasoontorn, Korn (PTT Exploration and Production Public Company Ltd) | Svasti-xuto, Maythus (PTT Exploration and Production Public Company Ltd) | Trithipchatsakul, Chao (PTT Exploration and Production Public Company Ltd) | Sunderland, Damon (Arup Pty Ltd) | Ingvorsen, Peter (Arup Pty Ltd) | Madrigal, Sarah (Arup Pty Ltd) | McAndrew, Russell (Arup Pty Ltd)
This paper presents an integration of geology, geohazards, geophysics and geotechnical assessments for a design of an offshore gas production facility and an associated export pipeline. The gas field described in this paper is located off the North West coast of Australia in the Timor Sea in a water depth of approximately 130m.
Various resource development options were investigated during the Concept Select / pre-Front End Engineering Design (pre-FEED) phase of the project. These options included fixed and floating structures in the infield area and a 300km long export pipeline that ties into an existing gas trunkline connecting to an onshore processing plant.
To provide the necessary engineering due diligence to allow the project to progress further, several phases of geo-related investigations were undertaken to assess various geohazard challenges and foundation risks. Some of these challenges include a pipeline route traversing several steeply sloping seabed canyons, potential activation of turbidite sequences, and the presence of very soft carbonate sediments to calcarenite rock.
This paper describes these ground related challenges and how they were constrained through the geo-related investigations conducted, observations made and results obtained. Ground related challenges are described in two parts: Pre-FEED export pipeline routing reviews focusing on geohazard, geophysical and geotechnical considerations and ‘real time’ pipeline engineering Finite Element Analysis (FEA) performed offshore. Compared to normal practice, this non-standard offshore analysis allowed a preferred pipeline corridor to be identified during the survey with an informed understanding regarding feasibility and likely seabed intervention, thus optimising the field survey time and cost; and Staged acquisition and integration of infield geophysical and geotechnical data for developing high level assessments of foundation concepts.
Pre-FEED export pipeline routing reviews focusing on geohazard, geophysical and geotechnical considerations and ‘real time’ pipeline engineering Finite Element Analysis (FEA) performed offshore. Compared to normal practice, this non-standard offshore analysis allowed a preferred pipeline corridor to be identified during the survey with an informed understanding regarding feasibility and likely seabed intervention, thus optimising the field survey time and cost; and
Staged acquisition and integration of infield geophysical and geotechnical data for developing high level assessments of foundation concepts.
Key benefits of conducting an integrated approach to geo-related challenges on a complex site will also be presented in this paper.
In order to understand the large scattering of elastic properties of carbonate rocks, two datasets were chosen in two different geological formations (non-tropical carbonate from Australia and actual continental carbonate from Turkey). Three statistical methods that aim to quantify the influence of Geological depositional environment and dominant pore type, that highlight similarities and differences on petro-elastic and petrophysic behaviors. Geological depositional environment information would be main reason for Vp variation as shown by Study 1, while in study 2 pore-type could have a strong link with P-wave velocity. To understand the origin of those similarities and differences, and to identify common information hidden inside the geological meanings, several simulation tests have been performed by digital rocks, in order to quantify the influences of the pore volume fraction, pore size and pore shape of carbonate microstructure. The numerical simulation shows that the pores size has statistically no influence on the elastic response; the pore shape is one of the main impacting parameter of the elastic properties. The future work consists on the understanding of influence factor for petrophysic parameter by more simulation results. The ultimate objective of this study is to identify factors that influence seismic velocity and then use it to better interpret the petrophysic parameters from seismic inversion.
The Cliff Head is one of the most significant discoveries in the offshore Northern Perth Basin. Hence, understanding the structure and geology of the field is essential to further evaluate the offshore region in the basin. Two structural models were developed with the objective to achieve a better understanding of this field. The first model is focused on the Permian and older strata, while the second model is for the overburden. In addition, reservoir properties models (e.g. porosity model and water saturation model) were developed to better understand the reservoir facies and hydrocarbon distribution. Examination of the structural models has shown that there are two main sets of faults within the Cliff Head area, which can be categorized into the following: the deep Permian faults that are truncated against the Late Permian unconformity, and younger Cretaceous faults that were developed during the Early Cretaceous rifting. It has also shown that the oil accumulation within the field is structurally trapped within Permian aged set of horsts and is mainly reservoired within the Irwin River Coal Measures. The secondary target (e.g. the underlying High Cliff Sandstone) is mostly beneath the regional oil-water contact of −1257.8 m TVDss, except in the highest structural point in the field, where Cliff Head-6 was drilled. The Irwin River Coal Measures in the study area contained four high resolution depositional sequences that displayed a finingupward pattern as depicted by the Gamma Ray log response and are interpreted to have mainly deposited in a fluvial depositional system. The High Cliff Sandstone, in contrast, contained two high resolution depositional sequences that displayed a coarsening upward sequences as supported by Gamma Ray log response and were interpreted to have mainly deposited in marginal marine settings. Reservoir properties modeling was also conducted utilizing the 3D models, where a 3D porosity model was calculated and shows that the Irwin River Coal Measures, in general, exhibit higher porosity distribution than the underlying High Cliff Sandstone, even though the later has coarser and more laterally extensive sand sheets. This is probably attributed to diagenetic porosity reduction within the High Cliff Sandstone caused by the formation waters. The calculated 3D water saturation model also confirms the presence of a single regional oil-water contact within the field and hence, reservoir heterogeneities and fault seal capacities did not affect the hydrocarbon distribution within the field. Finally, all the calculated models (e.g. lithofacies model, porosity model, and water saturation model) were integrated to estimate the recoverable hydrocarbons in place, where the Cliff Head is estimated to contain a total of 15.2 million barrels.
By the end of 2018, Western Australia will be exporting nearly 50 million tonnes per annum of LNG. This is an exciting time for the young professionals lucky enough to call Perth their home. This guide is for those planning a relocation, business trip, attendance at an industry event, pleasure travel, or who are just curious about Perth and Western Australia, its history, and its role in today’s oil and gas industry.
The largest city located below sea level, and a UNESCO World Heritage Site, Baku, Azerbaijan, boasts scenic nature attractions and an oil industry dating back many centuries. By the end of 2018, Western Australia will be exporting nearly 50 million tonnes per annum of LNG. This is an exciting time for the young professionals lucky enough to call Perth their home. A Harvard Business Review article explores the challenges of settling back into your own culture after returning from an assignment. Six young professionals share the stories of the career transitions they have faced, the challenges involved, and the soft skills they used to succeed in them.
Steady-state modeling of an asset requires the work of multiple engineering teams, which often leads to suboptimal facility design. An integrated model using information consistently across the entire asset may alleviate the pain resulting from conventional methods. Researchers from Chevron are looking into a new approach to understand the drivers of polymer hydration. How might this affect the design of mixing systems in the field, and could it affect offshore EOR applications? The contract covers the installation of umbilicals, flying leads, and manifolds for the project, which aims to expand and upgrade subsea facilities for the gas field located offshore western Australia.
The $2.15-billion deal gives the company an 80% ownership stake in what could be one of Australia’s largest offshore discoveries in years. The long-awaited Ichthys LNG Project off Western Australia has finally started gas production. LNG liquefaction is expected in a few weeks. The contract covers the installation of umbilicals, flying leads, and manifolds for the project, which aims to expand and upgrade subsea facilities for the gas field located offshore western Australia. Add Energy has partnered with Transborders Energy and will work with TechnipFMC and MODEC to develop a 1.0-MTPA FLNG vessel for small-scale stranded fields.
The complete paper proposes an azimuthal plane-wave-destruction (AzPWD) seismic-diffraction-imaging work flow to efficiently emphasize small-scale features associated with subsurface discontinuities such as faults, channel edges, and fracture swarms. This paper contrasts the detailed perforating and flowback plan with the results of the operation where a number of planned, and some unplanned, contingencies were faced. A hybrid downhole microseismic and microdeformation array was deployed to monitor fracture stimulation of a vertical coal-seam-gas (CSG) exploration well in the Gloucester Basin in New South Wales, Australia, to provide more-accurate insight into overall fracture height. This paper outlines the key issues that must be addressed from a regulatory perspective in regard to the development of an onshore unconventional-gas industry in the Northern Territory. This paper provides an insight into the challenges encountered and overcome during installation of 20 subsea structures, some close to 1000 t in weight and in water depths of up to 1350 m, for the Gorgon project offshore Western Australia.
The oil and gas industry faces three key questions with regard to sustainability. Can we transform oil and gas into a cleaner, efficient source of energy with minimum or zero-net CO2 emissions? The New SPE International App allows you access to SPE anytime, anywhere. It has many great benefits: access to our widely used OnePetro® and PetroWiki® platforms, the latest content from SPE magazines and publications which you can tailor to your preferences, and global networking opportunities through SPE Connect. Bhd. is one of the seven offices of the Society of Petroleum Engineers (SPE) located in Kuala Lumpur, Malaysia providing opportunities for professionals to enhance their technical and professional abilities.