Testing Method and Prediction Model of Elemental Sulfur Solubility in Sour Gas Reservoirs

doi:10.3969/j.issn.1006-6535.2022.02.015

Abstract

Abstract: To address the problem of low accuracy in measuring the solubility of elemental sulfur in sour gas reservoirs, an experimental device and experimental method for testing the elemental sulfur solubility in sour gas reservoirs were established based on the solvent dissolution principle to determine the solubility of elemental sulfur in sour gas sample of a gas reservoir. The results of the study showed that the solubility of elemental sulfur in sour gas reservoir was 0.001 to 0.968 g/m³ under standard conditions at a formation temperature of 40.0 to 98.9 ℃ and a formation pressure of 15.0 to 49.8 MPa; the solubility of elemental sulfur was positively correlated with temperature and pressure, specifically increasing with the increase of temperature and pressure; based on the Chrastil semi-empirical model, a new model was established to calculate the solubility of elemental sulfur; the comparison of various models indicated that the new model was more accurate, with an average error of 1.79%. The study results provide important basic data and research method for the phase state and sulfur deposition control of sour gas reservoirs.

Key words: sour gas reservoir, elemental sulfur content, experimental method, solubility, Chrastil model

CLC Number:

TE135

Wu Yajun, Wang Ning, Zhang Guangdong, Zhang Mingdi, Mo Chaoping. Testing Method and Prediction Model of Elemental Sulfur Solubility in Sour Gas Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 104-109.

References

[1] 张广东.高含硫气藏相态特征及渗流机理研究——以元坝地区长兴组气藏为例[D].成都:成都理工大学,2014.
ZHANG Guangdong.Study on phase characteristics and seepage mechanism of sour gas reservoirs-a study case of Changxing Formation gas reservoir in Yuanba Area[D].Chengdu:Chengdu University of Technology,2014.
[2] KENNEDY H T,WIELAND D R.Equilibrium in the methane-carbon dioxide-hydrogen sulfide-sulfur system[J].JPT,1960,219(7):166-169.
[3] SWIFT S C,MANNING F C,THOMPSON R E.Sulfur bearing capacity of hydrogen sulfide gas[C].SPE5669,1976:57-64.
[4] 谷明星,里群,邹向阳,等.固体硫在超临界/近临界酸性流体中的溶解度(Ⅰ)实验研究[J].化工学报,1993,44(3):315-320.
GU Mingxing,LI Qun,ZOU Xiangyang,et al.Solubility of solid sulfur in super/near-critical H₂S-containing sour fluid mixtures(I) experimental investigation[J].CIESC Journal,1993,44(3):315-320.
[5] SUN C Y,CHEN G J.Experimental and modeling studies on sulfur solubility in sour gas[J].Fluid Phase Equilibria,2013,214(2):187-195.
[6] 杨学锋.高含硫气藏特殊流体相态及硫沉积对气藏储层伤害研究[D].成都:西南石油大学,2006.
YANG Xuefeng.Study on special fluid phases of sour gas reservoir and damage of sulfur deposition to gas reservoir[D].Chengdu:Journal of Southwest Petroleum University,2006.
[7] 付德奎,郭肖,杜志敏,等.高含硫气藏硫沉积机理研究[J].西南石油大学学报,2009,31(5):109-111.
FU Dekui,GUO Xiao,DU Zhimin,et al.Sulfur deposition mechanism of the gas reservoirs with high sulfur content[J].Journal of Southwest Petroleum University,2009,31(5):109-111.
[8] 李丽.高含硫气藏井筒硫沉积相态及动态预测模型研究[D].成都:西南石油大学,2012.
LI Li.Research on prediction models of phase state and dynamics for well bore sulfur deposition in gas reservoir with high sulfur content[D].Chengdu:Southwest Petroleum University,2012.
[9] 杜志敏,张勇,郭肖,等.高含硫气藏中的硫微粒运移和沉积[J].西安石油大学学报(自然科学版),2008,23(1):69-72.
DU Zhimin,ZHANG Yong,GUO Xiao,et al.Migration and deposition of sulfur particle in the gas reservoir with high H₂S content[J].Journal of Xi′an Shiyou University(Natural Science),2008,23(1):69-72.
[10] 张勇,杜志敏,郭肖,等.硫沉积对高含硫气藏产能影响数值模拟研究[J].天然气工业,2007,27(6):94-96.
ZHANG Yong,DU Zhimin,GUO Xiao,et al.A numerical simulation study on the impact of sulfur deposit on productivity of sour gas reservoirs[J].Natural Gas Industry,2007,27(6):94-96.
[11] ROBERTS B E.The effect of sulfur deposition on gas well inflow performance[C].SPE36707,1996:285-296.
[12] BRUNNER E,PLACE J,WOLL W.Sulfur solubility in sour gas[J].Journal of Petroleum Technology,1988,40(12):1587-1592.
[13] CHRASTIL J.Solubility of solids and liquids in supercritical gases[J].Physical Chemistry,1982,86(2):3016-3018.
[14] 关小旭,李朋,张砚,等.应用Chrastil缔合模型计算元素硫在酸性气体中的溶解度[J].西安石油大学学报(自然科学版),2017,32(1):101-106,118.
GUAN Xiaoxu,LI Peng,ZHANG Yan,et al.Calculation of solubility of elemental sulfur in acid gas mixture by Chrastil′s association model[J].Journal of Xi′an Shiyou University(Natural Science),2017,32(1):101-106,118.
[15] GUO X,WANG Q.A new prediction model of elemental sulfur solubility in sour gas mixtures[J].Journal of Natural Gas Science and Engineering,2016,31:98-107.
[16] 李洪,李治平,赖枫鹏,等.高含硫气藏元素硫溶解度预测新模型[J].西安石油大学学报(自然科学版),2015,30(2):88-92.
LI Hong,LI Zhiping,LAI Fengpeng,et al.A new model for predicting solubility of sulfur in high sulfur content gas reservoirs[J].Journal of Xi′an Shiyou University(Natural Science),2015,30(2):88-92.