Cudjoe, Sherifa (University of Kansas) | Liu, Siyan (University of Kansas) | Barati, Reza (University of Kansas) | Hasiuk, Franciszek (Kansas Geological Survey) | Goldstein, Robert (KICC - University of Kansas) | Tsau, Jyun-Syung (TORP - University of Kansas) | Nicoud, Brian (Chesapeake Energy) | Bradford, Kyle (Chesapeake Energy) | Baldwin, Amanda (Chesapeake Energy) | Mohrbacher, David (Chesapeake Energy)
The objective of this work is to conduct pore-scale analysis of the pore systems in an Eagle Ford (EF) outcrop sample and a Lower Eagle Ford (LEF) sample from a producing interval in the subsurface. After characterization, we estimate bulk transport properties (such as tortuosity and permeability) within each pore network model (PNM) using the lattice Boltzmann method (LBM). Comparing the two will evaluate the degree to which outcrop samples of the EF are or are not applicable analogs to the subsurface for laboratory-scale "huff-n-puff’ enhanced oil recovery experiments.
Grain types and pore systems of both samples were visualized and quantified at the micro- and nanoscale using scanning electron microscopy/backscattered electron microscopy (SHM/BSH), energy- dispersive X-ray spectroscopy (EDS), and focused ion beam-scanning electron microscopy (FIB-SEM). These methods measure mineral content, elemental (mineral) analysis, size distribution of pores and pore throats in addition to serving as the basis to develop pore network models (PNMs) for simulation. The LBM was then applied to the extracted pores to estimate permeability for each medium.
The 2D SEM/BSE/EDS images of the EF outcrop sample showed that the microstructure of finegrained inorganic matrix was modified by calcite neomorphic and passively precipitated microspar, spar, and pseudospar altering the texture of the depositional matrix, low clay content with some of feldspar, solution-enlarged microfractures, compactional fractures, coccolith debris, and calcite deformation (solution-enlarged cleavages). There are abundant microfossils including foraminifer tests ("forams") filled with either diagenetic calcite, quartz, organic matter or a mixture of these minerals; the organic matter in the foram chambers mostly show cracks/shrinkage pores or lack pores in organic matter.
On the other hand, the LEF reservoir sample showed significantly different diagenetic alteration with localized phosphate diagenesis, less calcite neomorphism, and better developed pores within the organic matter infilling the foraminiferal tests as well as in depositional kerogen embedded within the inorganic matrix. In addition, 3D FIB- SEM volumes showed the variation in tortuosity of each extracted PNM and its impact on the diffusion coefficient during gas huff-n-puff recovery. The LBM enabled the estimation of permeability at the molecular level from each extracted PNM.
Not surprisingly, the textural and compositional differences between the outcrop and subsurface samples lead to different PNM and different behavior in huff-n-puff experiments. This work bridges a gap in the literature by comparing and revealing the pore-scale heterogeneities of an outcrop sample to that of a subsurface sample to measure the impact of the underlying mechanisms associated with gas huff-n-puff recovery at the laboratory-scale, while estimating permeability within extracted pores with the LBM.
Is the Cloud Mature Enough for High-Performance Computing? Data volumes are growing at an exponential rate. How can high-performance computing solutions help operators manage these volumes? Will faster, stronger processors and cloud computing solutions be the answer? Last year saw continued contraction in the seismic data-acquisition industry.
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Decommissioning and abandonment comes with its share of unexpected surprises, but many of those surprises could be avoided merely through better planning and care. The next big wave of decommissioning and abandonment projects is set to occur in the Asia-Pacific region, and APAC’s operators are now tasked with finding cost- and time-effective ways of unwinding their huge agglomeration of wells and facilities. A panel of executives, project managers, and government regulators involved with the Mad Dog project in the US Gulf of Mexico discuss the importance of collaboration and strategic alignment in project development.
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The Italian operator reported positive appraisal and exploration results from wells drilled some 10,000 km apart. UK operator Trident Energy is entering Brazil while Australian firm Karoon Energy is expanding its position in the country. Both will try to boost output from already-producing assets. Findings from Kayrros suggest the average Permian well is both less productive and more expensive than reflected in public data. Mexican President Andrés Manuel López Obrador is prioritizing investment in Pemex over foreign participation as a means to boost the country’s shrinking oil output.
Anchored by the Khaleesi-Mormont and Samurai fields, the King’s Quay FPS will receive and process up to 80,000 B/D of crude oil. UK operator Trident Energy is entering Brazil while Australian firm Karoon Energy is expanding its position in the country. Both will try to boost output from already-producing assets. The world’s largest oil producer has awarded $18 billion in engineering, procurement, and construction contracts as part of its Marjan and Berri expansion projects. The Norwegian operator will increase its ownership of the giant Johan Sverdrup field before the field commences oil production this November.
This paper introduces a new core-analysis work flow for determining resistivity index (RI), formation factor (FF), and other petrophysical properties directly from an as-received (AR) set of core samples. This paper discusses a study undertaken to gain better understanding of nuclear magnetic resonance (NMR) characteristics of volcanic reservoirs with different lithologies. Is the Cloud Mature Enough for High-Performance Computing? Data volumes are growing at an exponential rate. How can high-performance computing solutions help operators manage these volumes?
Researchers from the Federal Reserve Bank of Dallas quantified the economic impact of the US shale revolution for the first half of this decade. Production from the Hibernia platform was shut down again on 17 August after its second oil spill in a month, while Husky Energy began to ramp up output from the White Rose field following the largest-ever spill off Canada’s easternmost province. Anchored by the Khaleesi-Mormont and Samurai fields, the King’s Quay FPS will receive and process up to 80,000 B/D of crude oil. Despite reports to the contrary, Permian well productivity remains healthy, with average new production per well in the basin matching all-time highs, Rystad says. Researchers mapped 251 faults in the North Texas home of the Barnett Shale, the birthplace of the shale revolution, finding that wastewater injection there “significantly increases the likelihood for faults to slip.”