Permeability Impairment due to Asphaltenes During Gas Miscible Flooding and its Mitigation

Turta, Alex; Najman, J.; Singhal, A.K.; Leggitt, Shelley; Fisher, Douglas

doi:10.2523/37287-ms

Cited by 8 publications

(4 citation statements)

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“…For instance, Shadman et al (2012) and Firoozinia et al (2016) used it to study the effect of inhibitors and dispersants on asphaltene precipitation from dead oil samples. Turta et al (1997) used this method to determine onset of asphaltene precipitation in live oil samples at reservoir conditions during gas flooding process.…”

Section: Viscosity Measurementmentioning

confidence: 99%

“…Built upon the concept of viscometry method, Turta et al (1997) developed a modified version of the procedure for detecting onset of asphaltene precipitation (and the associated volume of precipitant needed) using a capillary tube viscometer for oil and a miscible solvent mixture at reservoir conditions. This technique allowed to detect the onset of asphaltene precipitation at high-pressure conditions.…”

Section: Viscosity Measurementmentioning

confidence: 99%

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A review on methods of determining onset of asphaltene precipitation

Soleymanzadeh

Yousefi

Kord

et al. 2018

J Petrol Explor Prod Technol

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Oil industry suffers from flow assurance problems that occur both in upstream and downstream operations. One of the common flow assurance issues arises from precipitation and deposition of asphaltenes in various locations along the oil production path including near wellbore region in the reservoir, production tubing, flowlines and separation unit at the surface. Asphaltene particles precipitate out of oil continuum due to changes in temperature, pressure or composition. Such changes in operating conditions occur during different recovery processes (natural depletion, gas injection, chemical injection, etc.) as well as production and blending of different oils during transportation. There are different experimental methodologies documented in the literature that describe how to determine onset of asphaltene precipitation. In this paper, a comprehensive review is performed on all the available procedures to measure onset of asphaltene precipitation. The advantages and limitations associated with all these methods are also documented.

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Section: Viscosity Measurementmentioning

confidence: 99%

Section: Viscosity Measurementmentioning

confidence: 99%

A review on methods of determining onset of asphaltene precipitation

Soleymanzadeh

Yousefi

Kord

et al. 2018

J Petrol Explor Prod Technol

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“…Injecting gas into crude oil causes changes that affect the oil’s solubility. Therefore, asphaltene starts to precipitate and flocculate because of the unstable condition of the colloidal suspension in the crude oil. , Various studies have investigated the effect of a number of factors on asphaltene deposition in conventional reservoir cores on permeability reduction. − Many investigations have been conducted to highlight the impact of gas injection on asphaltene deposition using nitrogen (N 2 ) and CO 2 . − The asphaltene instability in shale/unconventional resources during the miscible/immiscible CO 2 huff-n-puff operation is still not fully understood. To do so requires investigating the conditions under which the asphaltene may deposit and precipitate in tight shale resources during the CO 2 huff-n-puff injection process.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Asphaltene Deposition and Its Impact on Oil Recovery in Eagle Ford Shale during Miscible and Immiscible CO₂ Huff-n-Puff Gas Injection

Elturki

Imqam

2023

Energy Fuels

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One of the challenges in extracting oil from unconventional resources using hydraulic fracturing and horizontal drilling techniques is the low primary recovery rate, which is caused by the ultra-small permeability of these resources. Consequently, it is essential to investigate gas injection methods to produce the trapped oil in shale formations. However, the injection process can cause asphaltene depositions inside the reservoir, leading to plugging of pores and oil recovery (OR) reduction. There has been limited research on using gas injection techniques to improve oil production in tight/unconventional resources, although carbon dioxide (CO2) and gas-enhanced oil recovery methods have been used in conventional resources. In order to determine whether or not the cyclic (huff-n-puff) CO2 process improves OR and aggravates asphaltene precipitation, a rigorous experimental investigation was undertaken utilizing filter membranes and Eagle Ford shale cores. After the minimum miscibility pressure was calculated for CO2, various injection pressures were selected to perform CO2 huff-n-puff experiments. Investigations were carried out at 70 °C on injection pressure, cycle number, production time, and huff-and-puff mode injection. The results demonstrated that when the pore size structure of the membranes used was smaller and gas injection cycles increased, a higher asphaltene weight percent (wt %) was determined during the static experiments (i.e., employing filter paper membranes). Miscibility improved OR in dynamic testing (i.e., using shale cores), but a more oil-wet system was detected in wettability measurements taken following CO2 huff-and-puff tests. The plugging impact of asphaltene particles on the pore structure was studied using optical microscopy and scanning electron microscopy imaging. Following the huff-and-puff tests, a mercury porosimeter revealed how severely the pores were plugged, and after the CO2 tests, the pore size distribution reduced as a consequence of asphaltene deposition. This study examines the significance of CO2 injection in OR under miscible/immiscible conditions to identify the critical parameters that could impact the effectiveness of CO2 huff-n-puff operation in unconventional formations.

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“…Asphaltene caused permeability reduction in conventional reservoirs has been well studied. Experimental work showed permeability reduction caused by asphaltene deposition in conventional reservoir cores, and effects of factors on permeability reduction were investigated . It was found that the injection gas concentration has the most impacts on permeability reduction.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of permeability reduction and pore size distribution change due to asphaltene deposition during CO₂huff and puff injection in Eagle Ford shale

Shen

Sheng

2017

Asia-Pacific J Chem Eng

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Many laboratory and simulation studies regarding gas injection enhanced oil recovery method in shale reservoir have been performed and shown good results. However, one problem not investigated is the asphaltene precipitation and deposition problem. In conventional reservoirs, the permeability reduction caused by asphaltene plugging and adsorption has been observed and well studied. In shale reservoirs, the deposition, if any, will be more critical.In this work, experimental studies were conducted to investigate the effect of asphaltene deposition on the pore size reduction and permeability reduction in shale core samples during the CO 2 huff and puff injection process using a dead oil sample from a Wolfcamp shale reservoir. A decrement of pore with a diameter size in the range from 100 to 800 nm and an increment of pore with a diameter size smaller than 100 nm were observed after 6 cycles of CO 2 huff and puff injection. The result indicates the existence of pore plugging and asphaltene adsorption during the gas injection process. The experimental results also showed a 47.5-nD permeability reduction after 6 cycles of CO 2 huff and puff injection. Compared with the original permeability of the shale core, 126 nD, the permeability reduction is more than one-third of the original permeability.

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Permeability Impairment due to Asphaltenes During Gas Miscible Flooding and its Mitigation

Cited by 8 publications

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A review on methods of determining onset of asphaltene precipitation

A review on methods of determining onset of asphaltene precipitation

Experimental Investigation of Asphaltene Deposition and Its Impact on Oil Recovery in Eagle Ford Shale during Miscible and Immiscible CO₂ Huff-n-Puff Gas Injection

Experimental study of permeability reduction and pore size distribution change due to asphaltene deposition during CO₂huff and puff injection in Eagle Ford shale

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Permeability Impairment due to Asphaltenes During Gas Miscible Flooding and its Mitigation

Cited by 8 publications

References 0 publications

A review on methods of determining onset of asphaltene precipitation

A review on methods of determining onset of asphaltene precipitation

Experimental Investigation of Asphaltene Deposition and Its Impact on Oil Recovery in Eagle Ford Shale during Miscible and Immiscible CO2 Huff-n-Puff Gas Injection

Experimental study of permeability reduction and pore size distribution change due to asphaltene deposition during CO2huff and puff injection in Eagle Ford shale

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Experimental Investigation of Asphaltene Deposition and Its Impact on Oil Recovery in Eagle Ford Shale during Miscible and Immiscible CO₂ Huff-n-Puff Gas Injection

Experimental study of permeability reduction and pore size distribution change due to asphaltene deposition during CO₂huff and puff injection in Eagle Ford shale