Laboratory investigation of asphaltene-induced formation damage

Struchkov, I.A.; Рогачев, М. К.; Kalinin, E. S.; Roschin, Pavel Valeriyevich

doi:10.1007/s13202-018-0539-z

Cited by 30 publications

(12 citation statements)

References 20 publications

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“…The Ashphaltene content of the crude oil sample from the NNPC station where in conformity with the standards set by the department of petroleum resources (DPR). Ashphaltene has been implicated as a major problem in petroleum (16), as it forms dense flocculation's and deposits in the reservoir, leading to transportation and operational problems (17).…”

Section: Physicochemical Properties Of the Crude Oil Samplesmentioning

confidence: 99%

Acute toxicity of crude oil from NNPC and artisanal refineries in Niger Delta on selected aquatic biota

Luke¹,

Odokuma²

2021

GSC Biol. and Pharm. Sci.

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The spill of Crude oil from artisanal refineries and government owned pipelines has become recurrent situation in the Niger Delta, leading to devastating effects on the aquatic ecosystem. The toxicity of Crude oil from NNPC (Nigerian National Petroleum Corporation) refinery and selected artisanal refineries in Bolo, Twon-Brass and Ekpemu of the Niger Delta were investigated. The physicochemical properties of the products from the artisanal refineries short fall of the standards of Crude oil for refineries, as they contained impurities. The toxicity of the Crude oil was tested using three representatives of different trophic levels in the aquatic habitat; Fish (Tilapia guineensis), Crusteceans (Paleamonetes africanus), and Moluscs (Tympanotomus fuscatus). The LC50, NOEC, LOEC, and TUa were the indices used for toxicity assessment of the crude oil on the test organisms. The study revealed that all the Crude oil samples were toxic to the organisms. The degree of toxicity of crude oil showed the following trend; Ekpemu (LC50 – 0.02ppt)> Twon-Brass (LC50 – 0.06ppt)> Bolo (LC50 – 0.11ppt)> NNPC (LC50 – 4.63ppt), while the degree of sensitivity was; Tilapia guineensis > Paleamonetes africanus > Tympanotonus fuscatus. The findings further emphasize the need to control Crude oil spillage into the aquatic ecosystem.

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Section: Physicochemical Properties Of the Crude Oil Samplesmentioning

confidence: 99%

Acute toxicity of crude oil from NNPC and artisanal refineries in Niger Delta on selected aquatic biota

Luke¹,

Odokuma²

2021

GSC Biol. and Pharm. Sci.

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“…Wax crystals occurrence on the walls of down-hole equipment is possible only after oil cooling to a temperature, below the temperature of oil saturation with paraffin. Reaching the saturation temperature is followed by the precipitation, as a solid phase, of the most highmelting paraffins (ceresins), which intensively begin to form deposits (Bikkulov et al, 1997;Struchkov et al, 2019;Struchkov et al, 2018;Joshi et al, 2005;Campbell et al, 2003;Shagiakhmetov et al, 2018). Therefore, when selecting a reagent for removing and preventing the formation of ARPD, the temperature of oil saturation with paraffin is deemed to be an important parameter.…”

Section: Figure 2 Dependence Of Light Absorption Coefficient and Optical Oil Density On The In-1 Reagent Concentration In Oilmentioning

confidence: 99%

Substantiation and Selection of an Inhibitor for Preventing the Formation of Asphalt-Resin-Paraffin Deposits

Khaibullina¹,

Сагирова²,

Sandyga³

2020

PTQ

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Currently, most oil fields are under the late stage of development, which is associated with some challenges during the production of reservoir products, including the formation of asphalt-resin-paraffin deposits (ARPD) in the “well – bottom-hole formation zone” system. Even though the problem of organic deposits creation has existed for more than 60 years, it is still relevant today. Currently, to prevent the formation of ARPD, inhibitors divided into methods based on the use of wetting agents, modifiers, depressors, and dispersants are widely used infield practice. The composition of inhibitors often includes surfactants, and according to field experience, nonionic surfactants, namely, polyesters, are widely used to prevent the formation of ARPD. However, little is known about inhibitors with a combined effect, for example, possessing depressor-dispersing properties concerning ARPD. Proceeding from the above, the work is aimed to develop a combined inhibitor with depressor-dispersing properties to prevent the formation of ARPD. The dispersing property of the prepared reagent for asphaltene particles was determined using capillary and photocolorimetric methods. The studies were conducted to assess the impact of the reagent on the freezing point. A quantitative assessment of the sedimentation process using the “Cold rod” installation was performed, and the results of studies of the developed ARPD reagent-inhibitor corrosion resistance were presented. Two methods determined the temperature of oil saturation with paraffin: the direct approach – visual observation (Axio Lab A1 microscope) and the indirect approach – rheogoniometry to determine the kinematic viscosity of oil (HVM-472 viscosity analyzer (Walter Herzog GmbH, Germany)). Thus, an ARPD inhibitor (IN-1), comprising a copolymer of ethylene with α-olefins or polymers of acrylic, methacrylic, or cyanoacrylic acid esters, an emulsifier of inverted oil-in-water emulsions and a solvent, was developed. The developed inhibitor, having depressor-dispersing properties, is capable of reducing oil-freezing point in winter and of slowing down the precipitation of paraffin crystals in well equipped and in the bottom-hole formation zone (BHFZ).

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“…At the first stage, the oil is injected into the core at the interstitial velocity below the critical interstitial velocity, which is determined empirically. Then, the concentration of suspended asphaltenes in the oil outlet of the core is measured by available methods [20], while the concentration inlet of the core remains constant. The concentration of asphaltenes in oil outlet of the core is lower than the inlet concentration as long as the asphaltenes are adsorbed onto the surface of pore throats.…”

Section: Calculation Of Production Profiles In Case Of Asphaltene Scamentioning

confidence: 99%

Estimation of Field Production Profiles in Case of Asphaltene Deposition

Olkhovskaya

Struchkov²,

Evich

2020

REFFIT

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In this work, we aimed to predict possible field production scenarios in case of asphaltene deposition based on field data as well as recommend remediation and stimulation measures to mitigate the risks of asphaltene deposition in the reservoir. We considered the influence of asphaltene formation in the near-wellbore of producers on the production data without reservoir pressure maintenance system in one of the oil fields. The asphaltene envelope in the reservoir oil was obtained, and the operating conditions of the field were evaluated under the possibility of asphaltene deposition. According to the results of dynamic modeling, the pressure map was plotted and the low-pressure areas in the near-wellbore were shown, which contributes to the aggravation of the problem associated with the asphaltene envelope. Based on the geometrical features of the low-pressure area, the dependence of the permeability reduction in the near-wellbore of the production well on the operating time was obtained using the asphaltene deposition model proposed by Wang and Civan. Based on the Buckley-Leverett theory, the field production profiles were calculated with and without asphaltene deposition. A decrease in the oil rate and consequently, the decrease in cumulative oil production in the field is expected due to the damage formation by solids. Maintenance of the production level will be facilitated by treating the near-wellbore with aromatic solvents and maintaining the reservoir pressure above the asphaltene onset pressure.

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Laboratory investigation of asphaltene-induced formation damage

Cited by 30 publications

References 20 publications

Acute toxicity of crude oil from NNPC and artisanal refineries in Niger Delta on selected aquatic biota

Acute toxicity of crude oil from NNPC and artisanal refineries in Niger Delta on selected aquatic biota

Substantiation and Selection of an Inhibitor for Preventing the Formation of Asphalt-Resin-Paraffin Deposits

Estimation of Field Production Profiles in Case of Asphaltene Deposition

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