Modeling Permeability Impairment in Porous Media due to Asphaltene Deposition under Dynamic Conditions

Lawal, Kazeem A.; Vesovic, Velisa; Boek, Edo S.

doi:10.1021/ef200764t

Cited by 38 publications

(24 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, it is not unusual for these conduits and conveyance systems to suffer flow restrictions resulting from solids depositions, as well as corrosion failures due to internal abrasion by suspended solid particles (Peng and Guo 2017). These solids, which are often major contributors to flow assurance problems, include natural gas hydrates, waxes, asphaltenes, naphthenates, scales and emulsions (Ragunathan et al 2020;Leporini et al 2019;Akinyemi et al 2018;Theyab 2017;Chi et al 2016;Borden 2014;Lawal et al 2012Lawal et al , 2011Lawal 2011).…”

Section: Introductionmentioning

confidence: 99%

An experimental study on high-pressure water jets for paraffin scale removal in partially blocked production tubings

Yar’Adua

John

Abbas

et al. 2020

J Petrol Explor Prod Technol

Self Cite

View full text Add to dashboard Cite

The common practice of using chemicals and solid-entrained liquids to remove soft scales in production tubings is associated with a high risk of contaminating the environment and eroding pipe internal surfaces. Due to the suspended solids, the current practices are also characterized by high pumping costs and are more problematic to rotating parts of machinery than freshwater. As a cheap and less risky alternative to these corrosive chemicals and liquids, this paper investigates the feasibility of utilizing multiple high-pressure (HP) water jets for the same objective. A total of 54 experimental trials were conducted to study the effects of four factors on the efficiency of scale removal with multiple flat-fan nozzles at an orientation of 25°. The factors investigated are (1) number of nozzles; (2) spray injection pressure; (3) stand-off distance between the spray nozzle and target scale; and (4) condition of the production tubing: ambient and pressurized. Details of the experimental set-up, equipment and procedure are provided. The results of these controlled experiments show a positive correlation between descaling efficiency and spray injection pressure. The same set of experiments reveals a negative correlation between descaling efficiency and nozzle count, as well as between descaling efficiency and spray stand-off. However, for the scale samples and range of parameters investigated in this study, descaling efficiency did not exhibit significant dependency on the chamber conditions, i.e. ambient versus pressurized. The results of this study provide some insights into the feasibility of multiple HP water jets as a cleaner alternative to the use of corrosive chemicals and solid-entrained liquids to remove soft scales in production tubings in oil fields and other applications.

show abstract

Section: Introductionmentioning

confidence: 99%

An experimental study on high-pressure water jets for paraffin scale removal in partially blocked production tubings

Yar’Adua

John

Abbas

et al. 2020

J Petrol Explor Prod Technol

Self Cite

View full text Add to dashboard Cite

show abstract

“…The model considers non-reactive flow, that is, the transported particles neither react nor form solutions with the filtrate, hence the main damage mechanism is mechanically induced, which includes impairment due to the injection of solids and velocity-induced damage (fines dislodgement, migration and settling) mainly for unconsolidated reservoirs (Bennion et al, 1994). Damage caused by scales, asphaltenes and wax is not considered (Lawal et al, 2011;Ring et al, 1994). 2.…”

Section: Model Assumptionsmentioning

confidence: 99%

Analysis of Injectivity Decline in Some Offshore Water Injectors

Dambani

Blunt

Tendo³

et al. 2014

All Days

View full text Add to dashboard Cite

The challenges and risks relating to injectivity decline due to injection of particulate-laden water are well documented in the petroleum industry and elsewhere. Although different theories have been advanced to rationalize this problem, the modeling aspects remain largely unresolved, putting huge investments at risk. By combining the fractional-flow and deep-bed filtration (DBF) theories, this work formulates a new model for describing reservoir impairments due to suspension transport by injection water.The critical settling velocity of the suspended particulates is determined from fractional-flow theory and used to create a condition at which particle settling will occur, dependent on its size. The particle settling velocity as obtained from Stokes law for laminar flow (N Re Ͻ Ͻ1) is compared to the critical settling velocity, which is a function of the residence time of the particles, to obtain the optimum transported particle size profile in the formation. Furthermore, the average size of transportable particulates and their total volumes are then obtained and used to determine the volume of deposits which is in turn used to develop a new injectivity decline model for predicting permeability impairment due to the deposition of suspended particles in the porous media.The resulting models are validated by analyzing reported dataset from two water injectors offshore Niger Delta. Overall, the results are reasonable as the impairment model rationalized available field dataset satisfactorily. The developed models should find relevance in the following field applications: (1) quantifying formation damage; (2) optimising water treatment facilities design; (3) implementing an effective and safe backflow operation.

show abstract

“…The following is a simple equation for estimating the average pore-throat radius of a porous medium (Lawal et al, 2011;Stolz and Graves, 2003). The following is a simple equation for estimating the average pore-throat radius of a porous medium (Lawal et al, 2011;Stolz and Graves, 2003).…”

Section: Casementioning

confidence: 99%

Application of Injection Fall-Off for Reservoir Characterisation and Production Optimisation: Cases from a Deepwater Field

Ojeke¹,

Lawal²,

Ibianga³

2013

All Days

Self Cite

View full text Add to dashboard Cite

In producing assets, the drive to reduce production deferments is increasing the interests in injection fall-off (IFO), as against pressure build-up, tests for reservoir characterisation. The IFO, which entails the measurement and analysis of pressure transients due to the shut-in of an injector after a period of continuous injection, provides estimates of important subsurface parameters such as static pressure, transmissibility and, where applicable, induced-fracture characteristics. This paper documents the application of IFO in selected cases from an oil-producing deepwater field. The pressure fall-off curves obtained for two water injectors in the subject deepwater field are analysed. Particular attention is paid to the analysis of the fall-off curves and the identification of the various flow regimes. The estimation of key subsurface parameters such as skin factor, transmissibility, and boundary characteristics is detailed.To reduce interpretation uncertainties, an integrated application of geoscience data has been employed to constrain the possible range of IFO interpretations. In addition, the IFO results have been used to rationalise the declining injectivity indices observed in the subject injectors, while providing clues for these observations at the pore scale. In essence, this work reechoes the credentials of IFO, as a credible and cheaper alternative to pressure build-up tests, for the characterisation of subsurface systems.

show abstract

Modeling Permeability Impairment in Porous Media due to Asphaltene Deposition under Dynamic Conditions

Cited by 38 publications

References 75 publications

An experimental study on high-pressure water jets for paraffin scale removal in partially blocked production tubings

An experimental study on high-pressure water jets for paraffin scale removal in partially blocked production tubings

Analysis of Injectivity Decline in Some Offshore Water Injectors

Application of Injection Fall-Off for Reservoir Characterisation and Production Optimisation: Cases from a Deepwater Field

Contact Info

Product

Resources

About