Impact of Water Cut on Asphaltene Deposition Tendency

Laboratory Investigation on Oil Increment and Water Cut Control of CO2, N2, and Gas Mixture Huff-n-Puff in Edge-Water Fault-Block Reservoirs

Journal of Energy Resources Technology ◽

10.1115/1.4048862 ◽

2020 ◽

Vol 143 (8) ◽

Author(s):

Peng Wang ◽

Fenglan Zhao ◽

Shijun Huang ◽

Meng Zhang ◽

Hairu Feng ◽

...

Keyword(s):

Synergistic Effect ◽

Production Efficiency ◽

Gas Injection ◽

Co2 Injection ◽

Gas Mixture ◽

Injection Volume ◽

Fault Block ◽

Asphaltene Deposition ◽

Water Cut ◽

Injection Ratio

Abstract Excessive water production is a common matter that seriously affects production efficiency during the development of edge-water fault-block reservoirs. Gas huff-n-puff is an effective water shutoff technology that has the characteristics of small injection volume, no interwell connectivity impact, and minor gas channeling. However, gas injection can destroy the stability of the asphaltene to induce asphaltene deposition. In this article, the laboratory experiment had been conducted to investigate the effect of injection ratio and injection sequence on oil increment and water cut control for gas mixture huff-n-puff. Experimental results indicated that the effect of N2 huff-n-puff on water cut control was the most obvious, while CO2 huff-n-puff had the best performance on oil increment. Oil increment and water cut control of gas mixture huff-n-puff with CO2 injected in advance were obviously better than that of N2 injection preferentially. Subsequently, PVTsim Nova was utilized to investigate whether reducing CO2 injection volume can inhibit asphaltene deposition and predict the possibility of asphaltene deposition at reservoir conditions. Simulation results demonstrated that the asphaltenes were easily deposited with CO2 injection while N2 injection will be unlikely to induce asphaltene deposition. Asphaltene deposition pressure envelope can qualitatively analyze the possibility of asphaltene deposition and provide a reference for screening the appropriate gas injection ratio based on giving full play to the synergistic effect of CO2 and N2. In this study, 7:3 is selected as the optimum injection ratio considering the synergistic effect and the possibility of asphaltene deposition.

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Wax and Asphaltene Deposition Tendency of Malaysian Crude Oils

ICIPEG 2014 ◽

10.1007/978-981-287-368-2_15 ◽

2015 ◽

pp. 155-169 ◽

Cited By ~ 1

Author(s):

Aliyu Adebayo Sulaimon ◽

Mohamad Hazwan Yusoff

Keyword(s):

Crude Oils ◽

Asphaltene Deposition ◽

Deposition Tendency

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Investigation Of Asphaltene Deposition Tendency From Abu Dhabi Crude Oil/brine Mixture Induced By Electrodeposition

10.5339/qfarc.2014.eepp0748 ◽

2014 ◽

Author(s):

Hadil Abu Khalifeh ◽

Hadi Belhaj ◽

Mohammed Haroun

Keyword(s):

Crude Oil ◽

Abu Dhabi ◽

Asphaltene Deposition ◽

Deposition Tendency

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Comparison of Acrylamide and Agar Gels by Freeze-Etching

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100080456 ◽

1977 ◽

Vol 35 ◽

pp. 606-607

Author(s):

Russell L. Steere ◽

Eric F. Erbe

Keyword(s):

Electron Microscope ◽

Sodium Hydroxide ◽

Sodium Hypochlorite ◽

Chromic Acid ◽

Distilled Water ◽

Thin Sheets ◽

Acid Cleaning ◽

Agar Gels ◽

Freeze Etching ◽

Water Cut

Thin sheets of acrylamide and agar gels of different concentrations were prepared and washed in distilled water, cut into pieces of appropriate size to fit into complementary freeze-etch specimen holders (1) and rapidly frozen. Freeze-etching was accomplished in a modified Denton DFE-2 freeze-etch unit on a DV-503 vacuum evaporator.* All samples were etched for 10 min. at -98°C then re-cooled to -150°C for deposition of Pt-C shadow- and C replica-films. Acrylamide gels were dissolved in Chlorox (5.251 sodium hypochlorite) containing 101 sodium hydroxide, whereas agar gels dissolved rapidly in the commonly used chromic acid cleaning solutions. Replicas were picked up on grids with thin Foimvar support films and stereo electron micrographs were obtained with a JEM-100 B electron microscope equipped with a 60° goniometer stage.Characteristic differences between gels of different concentrations (Figs. 1 and 2) were sufficiently pronounced to convince us that the structures observed are real and not the result of freezing artifacts.

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