An experimental and theoretical investigation of asphaltene precipitation in a crude oil from the Brazilian pre-salt layer under CO2 injection

被引：23

作者：

Nascimento, Fabio P. ^{[1
]}

Pereira, Veronica J. ^{[1
]}

Souza, Renan P. ^{[2
]}

Lima, Rui C. A. ^{[1
,3
]}

Costa, Gloria M. N. ^{[1
]}

Rosa, Paulo T. V. ^{[2
]}

Forca, Ana F. ^{[4
]}

Vieira de Melo, Silvio A. B. ^{[1
,5
]}

机构：

[1] Univ Fed Bahia, Escola Politecn, Programa Posgrad Engn Ind, Rua Aristides Novis 2, BR-40210630 Salvador, BA, Brazil

[2] Univ Estadual Campinas, Inst Quim, Programa Posgrad Quim, Cidade Univ Zeferino Vaz, BR-13083970 Sao Paulo, Brazil

[3] Lab Petr & Gas LAPEG, Ave Anita Garibaldi 1651, BR-40210750 Salvador, BA, Brazil

[4] Petrogal Brasil SA, Ave Republ Chile 330,13 Andar, BR-20031170 Rio De Janeiro, RJ, Brazil

[5] Univ Fed Bahia, Ctr Interdisciplinar Energia & Ambiente, Campus Univ Federacao Ondina, BR-40170115 Salvador, BA, Brazil

来源：

FUEL | 2021年 / 284卷

关键词：

Asphaltene precipitation; Bubble pressure; CO2; injection; Pre-salt; Crude oil; Peng-Robinson equation of state; CUBIC-PLUS-ASSOCIATION; BINARY INTERACTION PARAMETERS; PC-SAFT CHARACTERIZATION; EQUATION-OF-STATE; PHASE-BEHAVIOR; ONSET PRESSURE; PENG-ROBINSON; TEMPERATURE; CPA; K(IJ);

D O I：

10.1016/j.fuel.2020.118968

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The asphaltene onset pressure (AOP) is a key parameter to determine the flow assurance of oils. In this work we performed an experimental study of the PVT (pressure-volume-temperature) properties of a crude oil from the Brazilian pre-salt layer. First, dead-oil was recombined with natural gas at the reservoir gas-oil ratio (GOR). Then, different techniques (volumetric, visual, light-scattering and filtration) were used to measure the AOP and bubble pressure (BP) at temperatures in the range of (293.15 to 348.15) K. The effect of CO2 injection on both properties was also evaluated at reservoir temperature. Additional data of mass density was measured at reservoir pressure and temperature. The experimental data were used to fit the adjustable parameters of the Peng-Robinson equation of state (PR-EoS) and the calculated results are compatible with the experimental data. The PR-EoS calculates a decrease in the AOP and an increase in the BP as temperature rises. PR-EoS correctly predicts the qualitative effect of gas injection on the studied properties: all evaluated properties increase as CO2 is injected in the recombined oil.

引用

页数：11

共 52 条

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