The green light for Santos Energy’s drilling program in the McArthur Basin comes after a moratorium on hydraulic fracturing in the Northern Territory was lifted in 2018. After drilling the Dorado-2 appraisal well, operator Santos Energy now expects a big increase in gas resources from predrill estimates, adding to one of the largest oil resources ever found on Australia’s North West Shelf.
The green light for Santos Energy’s drilling program in the McArthur Basin comes after a moratorium on hydraulic fracturing in the Northern Territory was lifted in 2018. After drilling the Dorado-2 appraisal well, operator Santos Energy now expects a big increase in gas resources from predrill estimates, adding to one of the largest oil resources ever found on Australia’s North West Shelf. 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.
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.
The firms are now partners on multiple blocks in the North Argentina Basin. Australia’s BHP Billiton and the recently acquired Anadarko Petroleum submitted the largest dollar totals of high bids in US Gulf of Mexico Lease Sale 253. 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. The discovery marks London-based Tullow’s first operated contribution to a long list of discoveries since 2015 in the emerging petroleum 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.
Latest News are articles brought to you online only and have not been published in an issue of JPT. The well will immediately be brought on production and is expected to flow at more than 100 MMscf/D of gas and 3,000 B/D of associated condensate, the company said. The $5.6-billion deal includes the Prudhoe Bay field and the Trans Alaska Pipeline and vaults Hilcorp to be the second-largest Alaska producer and reserves holder, behind only ConocoPhillips. The shale sector is studying the results of a 23-well experiment in the southeastern corner of New Mexico to learn what the wider implications might be. The shale sector is making moves to consolidate amid investor pressure to increase cash flow. This deal will form the second-largest producer in Colorado’s DJ Basin.
The discovery marks London-based Tullow’s first operated contribution to a long list of discoveries since 2015 in the emerging petroleum province. The large independent put together a team of data scientists, software developers, and petrotechnical staff to create a forward-looking vision for how to use digital technology to solve problems. Leaders from two large US onshore rig contractors said their expectations that the rig-count slide would hit a second-quarter bottom were off and are now refraining from making new predictions as to when it will end. The Italian operator reported positive appraisal and exploration results from wells drilled some 10,000 km apart. The green light for Santos Energy’s drilling program in the McArthur Basin comes after a moratorium on hydraulic fracturing in the Northern Territory was lifted in 2018.
Exploration in 2018 got off to a strong start when the Chevron-operated Ballymore well encountered 205 m of net oil pay in the US Gulf of Mexico. Drilled by Pacific Drilling’s Sharav deepwater drillship, the well reached a total depth of 8,898 m. Global discovered oil and gas resources and big project sanctions are expected to remain on the upswing through next year, according to separate industry outlooks from Rystad Energy and Wood Mackenzie. Internalizing lessons from a difficult last few years, operators are choosing investments more wisely and now better prepared to deal with volatile oil markets, the consultancies concluded. "Portfolios are set to weather low prices, and the recent slide in prices justifies the sector’s conservative mindset."
In the petroleum industry, accurately estimating wellbore heat loss in thermal recovery processes remains a critical problem. One difficulty lies in simulating heat transfer and fluid dynamics within wellbore annuli. A literature survey shows that the state-of-the-art thermal wellbore simulators use empirical correlations to calculate the heat loss through wellbore annuli. As more sophisticated wells have been drilled, there is a growing need for a more detailed wellbore annulus heat transfer model. In this study, a 2D transient mathematical model is proposed for the conjugate natural convection and radiation within wellbore annuli. The governing equations consist of a continuity equation, a vorticity transfer equation, an energy transport equation and a radiative transfer equation (RTE). A finite volume approach with a second-order upwinding scheme is implemented for discretization. Newton-Raphson iterations are deployed for linearization. The algorithm is validated by consistence in simulation results compared with benchmark numerical solutions with the Rayleigh number up to 107. Parameters such as an aspect ratio, a radius ratio and a conduction-to-radiation coefficient are examined. A case study on vacuum insulated tubing heat transfer using Marlin Well A-6 data demonstrates the merits of the developed program by the consistence of simulation results compared with field measurements.
Zhang, Bo (China University of Petroleum) | Guan, ZhiChuan (China University of Petroleum) | Wang, Qing (China University of Petroleum) | Xuan, LingChao (China University of Petroleum) | Liu, Yongwang (China University of Petroleum) | Sheng, Yanan (China University of Petroleum)
Deepwater oil and gas wells will generate annular pressure due to the redistribution of wellbore temperature in production stage when the hyper-thermal fluid is lifted from reservoir formation. Annular pressure threatens casing integrity and well safety. Related accidents have been reported in Mexico Gulf, South China Sea and some other deepwater oilfield. The analysis indicates that annular pressure buildup is so high that deepwater well is in the risk of casing collapse, so it is necessary to take some measures to mitigate annular pressure. Since subsea wellhead is unable to release pressure, appropriate completion measures must be considered. Good understanding of mechanism as well as accurate calculation is prerequisite for appropriate completion, so a model is built based on comprehensive consideration of multi-string interaction and heat transfer process to offer basic pressure data for well completion.
According to Annular Pressure Build-up mechanism, pressure can be controlled by releasing expanded liquid out or getting extra space to accommodate liquid as well as slowing down increasing speed of annular liquid temperature. Some completion technologies can work as mitigation measures. These mitigation methods can be divided into two types: active and passive. Active methods function through increasing heat-transfer resistance or eliminating annulus, including full-height cementing, heat-insulated liquid, thermal-insulated pipes and reducing production rate. Passive methods mitigate pressure build-up by releasing some extra space to contain expanded fluid, including cement shortfall, rupture disc, compressible foam and highly compressible annular fluid. These measures differs at cost, operating difficulty, reliability and working mechanism. Among them, thermal-insulated Pipes, heat-insulated liquid, compressible foam, rupture disc, increase the annular liquid compressibility possess good applicability and have been applied in some wells or tested through experiments. Considering deepwater wells' structure, this paper analyzes the feasible measures and offer design methods.
Long, Xiaoyan (Fugro GeoConsulting, Inc.) | Tjok, Ko Min (Fugro GeoConsulting, Inc.) | Trandafir, Aurelian C. (Fugro GeoConsulting, Inc.) | Sato, Ryosuke (Japan Oil, Gas and Metals National Corporation) | Yamamoto, Koji (Japan Oil, Gas and Metals National Corporation)
A comprehensive geotechnical site investigation program comprising in situ piezocone penetration tests (PCPT) and extensive onshore static and dynamic laboratory testing scope were performed for integrated soil characterization of the first offshore methane hydrate (MH) production test area off the coasts of Atsumi and Shima Peninsulas, offshore Japan. The in-situ and laboratory geotechnical test results along with a suite of geophysical data (subbottom profiler data (SBP), 3D seismic and Logging-while-Drilling (LWD) data) have been utilized to assess soil condition and develop pertinent design parameters for offshore foundation design at the production test sites under static and dynamic loading conditions. Results of the integration and interpretation of geotechnical and geophysical data are presented and discussed here.