DEEP- WATER RESERVOIR APPRAISAL IN THE PHILIPPINES: AN INNOVATIVE EXTENDED TEST

1989 ◽  
Vol 29 (1) ◽  
pp. 11
Author(s):  
D. McGuinness ◽  
J. Branson
Keyword(s):  
History Matching ◽  
Water Reservoir ◽  
Weather Conditions ◽  
The Philippines ◽  
Drilling Rig ◽  
Bottom Hole ◽  
Acceptable Model ◽  
Bottom Hole Flowing Pressure ◽  
Economic Analyses ◽  
Geological Complexity

The extended test arrangement for the Galoc Field, offshore Philippines, consisted of a semi- submersible drilling rig having a conventional spread mooring to which was connected a storage tanker. The tanker was moored stern to the rig by a disconnectable hawser. At its bow, two anchor lines, also disconnectable, were laid in N/S quadrature symmetrically disposed about the NE/SW tanker orientation. The tanker was thus free to depart from the location, either to discharge its stored oil or to stand by/take cover in the event of heavy weather conditions exceeding the capacity to stay on location.At each lifting, a bottom- hole flowing pressure survey was conducted immediately prior to shut- in. When the well was shut in to disconnect the tanker, the pressure survey incorporated the pressure build- up and subsequently, after reconnection, the pressure drawdown transients. The data batches were collected on digital tapes for analysis.With only three wells in the structure proper, the geological complexity of the reservoir setting did not permit a definitive interpretation of reservoir behaviour during the extended test. However, the use of generic descriptions of submarine fan turbidite deposits, in com- bination with the results obtained from the three wells and history- matching attempts in reproducing the extended test behaviour, did result in a good level of confidence that we had derived an acceptable model of the Galoc Field. The forecast production profiles derived for the various development schemes were thus considered to be reliable enough for comparative economic analyses of the development options.

A Fast Gridding Method for Capturing Geological Complexity and Uncertainty

2021 ◽  
Author(s):  
Yifei Xu ◽  
Priyesh Srivastava ◽  
Xiao Ma ◽  
Karan Kaul ◽  
Hao Huang
Keyword(s):  
Efficient Method ◽  
Reservoir Simulation ◽  
History Matching ◽  
Mapping Method ◽  
Reservoir Properties ◽  
Structural Framework ◽  
Assisted History Matching ◽  
Grid Topology ◽  
Geological Complexity ◽  
Complex Channel

Abstract In this paper, we introduce an efficient method to generate reservoir simulation grids and modify the fault juxtaposition on the generated grids. Both processes are based on a mapping method to displace vertices of a grid to desired locations without changing the grid topology. In the gridding process, a grid that can capture stratigraphical complexity is first generated in an unfaulted space. The vertices of the grid are then displaced back to the original faulted space to become a reservoir simulation grid. The resulting reversely mapped grid has a mapping structure that allows fast and easy fault juxtaposition modification. This feature avoids the process of updating the structural framework and regenerating the reservoir properties, which may be time-consuming. To facilitate juxtaposition updates within an assisted history matching workflow, several parameterized fault throw adjustment methods are introduced. Grid examples are given for reservoirs with Y-faults, overturned bed, and complex channel-lobe systems.

scholarly journals Influence of Surface Reflection (Albedo) in Simulating the Sun Drying of Paddy Rice

2020 ◽  
Vol 10 (15) ◽  
pp. 5092
Author(s):  
Ana Salvatierra-Rojas ◽  
Victor Torres-Toledo ◽  
Joachim Müller
Keyword(s):  
Field Experiments ◽  
Positive Impact ◽  
Weather Conditions ◽  
The Philippines ◽  
Paddy Rice ◽  
The Sun ◽  
Transient Model ◽  
Surface Reflection ◽  
Sun Drying ◽  
Drying Model

The sun drying of agricultural products is a complicated process involving heat transfer, mass transfer, and variable weather conditions. Surface reflection (albedo), a crop’s radiative property, plays an essential role in energy balance, and understanding its contribution can improve the thermal analysis. In this study, field experiments were conducted in the Philippines to explore the influence of surface albedo on the sun drying of paddy rice. First, we implemented energy and mass balance equations in a transient model with the surroundings using a graphical programming language in Matlab/Simulink®. Second, we identified the influence of albedo on the sun drying model by using a sensitivity analysis. Third, we investigated the relationship of paddy rice albedo and the solar zenith angle. Lastly, we integrated the albedo function into the sun drying model. The simulation outputs were validated with field experiments. A better estimation of the measured exit temperature and instantaneous mass were obtained when a variable albedo was applied. This study makes clear that introducing a variable albedo has a positive impact on model improvement. This information is important for application in solar drying technologies, so that the drying process can be better assessed.

scholarly journals Role of Gas Viscosity for Shale Gas Percolation

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Xiaoming Wang ◽  
Junbin Chen ◽  
Dazhong Ren ◽  
Zhaolong Shi
Keyword(s):  
Pressure Drop ◽  
Shale Gas ◽  
Double Porosity ◽  
Gas Viscosity ◽  
Important Index ◽  
Bottom Hole ◽  
Fracture Systems ◽  
Bottom Hole Flowing Pressure ◽  
Porosity Model

Viscosity is an important index to evaluate gas flowability. In this paper, a double-porosity model considering the effect of pressure on gas viscosity was established to study shale gas percolation through reservoir pressure, gas velocity, and bottom hole flowing pressure. The experimental results show that when pressure affects gas viscosity, shale gas viscosity decreases, which increases the percolation velocity and pressure drop velocity of the free state shale gas in matrix and fracture systems. And it is conducive to the desorption of adsorbed shale gas and effectively supplemented the bottom hole flowing pressure with the pressure wave propagation range and velocity increasing, so that the rate of pressure drop at the bottom of the well slows down, which makes the time that bottom hole flowing pressure reaches stability shortened. Therefore, the gas viscosity should be fully considered when studying the reservoir gas percolation.

Observed Wave Actions on Norwegian Semi-Submersible and TLP Decks

2018 ◽  
Author(s):  
Arne Kvitrud ◽  
Anders H. Løland
Keyword(s):  
Physical Appearance ◽  
Weather Conditions ◽  
Wave Impact ◽  
Drilling Rig ◽  
Common Causes ◽  
Horizontal Wave

Waves have impacted decks on Norwegian semi-submersibles (semis) and TLPs several times. However, it did not get necessary attention before two accidents in 2015. In 2015, a wave impact caused a fatality and four injured on the semi-submersible drilling rig COSLInnovator. The same year, a wave washed away gratings on Scarabeo 8, causing a man to fall 13.5m to the sea. When examining our records, we found 29 reported incidents related to waves in deck on 17 platforms from 2000–2017. 27 of the wave actions were mainly directed upward and the remaining two were mainly horizontal wave hits. We describe each incident and the circumstances. We discuss common causes related to weather conditions and the physical appearance of the platforms. Further, we summarise design and operational precautions taken by the industry.

Adaptive Simulated Annealing Genetic Algorithm for Optimizing Injection Production Parameters of Steam Flood Well

2011 ◽  
Vol 328-330 ◽  
pp. 1855-1859
Author(s):  
Tian Jian Sun ◽  
Jun Feng Shi ◽  
Xing He Yu
Keyword(s):  
Genetic Algorithm ◽  
Simulated Annealing ◽  
Steam Temperature ◽  
Injection Speed ◽  
Simulated Annealing Genetic Algorithm ◽  
Bottom Hole ◽  
Bottom Hole Flowing Pressure ◽  
Steam Flood ◽  
Adaptive Simulated Annealing ◽  
The Mathematical Model

The development effect of steam flood well is influenced by the combination of the following parameters: injection speed, dryness fraction of steam, temperature of injection steam, and bottom hole flowing pressure. Taking the advantage of adaptive simulated annealing genetic algorithm with the characteristic of fast search and globally optimization, and combine with the mathematical model of the steam flood well. Maximization of the vapor-liquid interface factor is the target to optimize injection production parameter of the steam flood well, the results of the optimization shows that cumulative oil production increases obviously.

INTEGRATING LOCAL COMMUNITIES AND RESOURCES INTO OIL SPILL PLANNING, PREPAREDNESS AND RESPONSE

2008 ◽  
Vol 2008 (1) ◽  
pp. 591-596 ◽  
Author(s):  
Joselito Guevarra
Keyword(s):  
Oil Spill ◽  
Weather Conditions ◽  
The Philippines ◽  
Vital Role ◽  
Local Communities ◽  
Response Effort ◽  
Response Strategies ◽  
Response Planning ◽  
Practical Guidelines ◽  
Commission Report

ABSTRACT Presently, close to 2 billion tons of oil is transported annually via international marine oil network. The increasing number of ships, especially bigger ones, has brought a sense of heightened concern to countries living in or close to these maritime corridors. Specifically, the concern is that of a major oil spill. The devastation caused by a major spill is always relative - to the amount, oil type, weather conditions, and most especially the area of impact. Coastal communities are especially vulnerable and those that have been hit by large spills, like in the Philippines, have borne the brunt of its force to its livelihood, resources and habitat. And most often than not, especially in remote areas, they are at the frontlines of combating the spill, whether it be clean up or other response strategies. The problem is that local communities are rarely formally integrated into the response planning framework such as in oil spill contingency plans. With more than half the world'S population living along or near the coastline, this is a valuable human resource that is untapped. The Alaska Oil Spill Commission report entitled ‘Spill: the Wreck of the Exxon Valdez’ recognized the vital role of local interests, local knowledge and experience in the response effort and suggested that ‘substantive roles should be given to the affected communities in any response system.’ The aim of this paper is to examine the current practices worldwide through case studies of how local communities are assimilated into the response frameworks and how these best practices can be formulated into practical guidelines that can be implemented effectively.

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