Removal of Plugged Asphaltene in a Reservoir by Earthquakes

Uetani, Takaaki; Matsuoka, Toshifumi; Honda, Hiromi

doi:10.2118/168137-ms

Cited by 6 publications

(1 citation statement)

References 23 publications

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“…A relationship exists between the impacts propagated by earthquakes and those by ultrasonic waves, in which both produce vibration effects. Uetani et al [44] proposed a relationship between the occurrence of earthquakes and improvement of asphaltene problems in a Japanese oil field study. In their study, the particular field had shown serious formation damage by asphaltene deposition that reduced the production rates in two wells.…”

Section: Field Studiesmentioning

confidence: 99%

Recent applications of ultrasonic waves in improved oil recovery: A review of techniques and results

et al. 2021

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Section: Field Studiesmentioning

confidence: 99%

Recent applications of ultrasonic waves in improved oil recovery: A review of techniques and results

et al. 2021

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Wettability Alteration by Asphaltene Deposition: A Field Example

Uetani

2014

Abu Dhabi International Petroleum Exhibition and Conference

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Description: Identifying and understanding wettability alteration caused by asphaltene deposition, and its implications for field development optimization is growing in interest. In this paper, we present a field case study on the cause of an unexpected decline in reservoir productivity and simultaneous rapid increase in water production. We concluded that the decline in productivity and water cut increase were caused by asphaltene precipitation in the formation with a subsequent increase in the water relative permeability. This was caused by alteration of rock wettability from water-wet to oil-wet by asphaltene deposition.Applications: This work's findings can improve understanding of reservoir performance and help optimize reservoir management strategies for oil reservoirs with potential asphaltene precipitation problems. Results and Conclusions:All possible parameters in the reservoir simulation model was thoroughly examined and discussed. Switching the relative permeability type from water-wet toward oil-wet at the asphaltene onset pressure (AOP) yielded an excellent history match with the observed rapid water production increase. The reservoir had been depleted following primary production; the laboratory PVT data indicated that the AOP was a little below the initial reservoir pressure and hence asphaltene precipitation had been predicted.Technical Contributions: This work contributes to (1) providing a field case bridging asphaltene deposition and wettability alteration, (2) understanding phenomena such as rapid increase in water production associated with asphaltene deposition, and (3) optimizing reservoir management and field development for oil reservoirs with potential asphaltene precipitation problems.

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How Many Back Up Prepared For Asphaltene Onset Pressure Measurement Using Costly Collected Single Phase Bottomhole Fluid Samples?

Yonebayashi

Miyagawa

Ikarashi

et al. 2016

SPE Annual Technical Conference and Exhibition

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For more accurate understandings of asphaltene flow assurance, nobody doubts the importance of asphaltene onset pressure (AOP) as direct information from live oil. For this purpose, a single phased bottomhole sample (BHS) has been taken as a standard process of the asphaltene flow assurance study even though expensive. This fluid sample is storing the closest information to the most representative in-situ asphaltene condition. Because of costly collected fluid sample, its handling and the examination using such a sample are carefully carried out to avoid unfavorable results and/or waste of sampling cost. However, unexpected experimental difficulties sometimes cause to result failure of AOP detection. In our AOP measuring experience, the latest method: laser light scattering technique (LST) has been applied because of its convenient and no time-consuming procedure. Our measuring equipment consists of the solid detection system (SDS) using LST as main function to judge AOP by power of light transmitted (PLT). In addition to the SDS, the apparatus consists of other measuring functions simultaneously: namely high pressure microscope (HPM) to observe asphaltene particle count and size visually, densitometer and viscometer to investigate the fluid kinetics. In this paper, these measuring functions were demonstrated as quite useful back up options to judge AOP when the SDS PLT results could not decide AOP solely. This demonstration can contribute maximizing data acquisition and use of the costly sample as much as possible. Furthermore, the paper describes that the AOP interpretation based on each kind of measured data would be aligned in order related to asphaltene particle growing condition because detection limits in each measurement were reflected into the AOP interpretation. In summary, the comprehensive interpretation can achieve AOP quality higher, and different measuring types of data basis interpretation would be possibly used as support data in each.

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Removal of Plugged Asphaltene in a Reservoir by Earthquakes

Abstract: This paper provides a phenomenological description of a positive correlation between earthquakes and improvement of

Cited by 6 publications

References 23 publications

Recent applications of ultrasonic waves in improved oil recovery: A review of techniques and results

Recent applications of ultrasonic waves in improved oil recovery: A review of techniques and results

Wettability Alteration by Asphaltene Deposition: A Field Example

How Many Back Up Prepared For Asphaltene Onset Pressure Measurement Using Costly Collected Single Phase Bottomhole Fluid Samples?

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