综合考虑应力敏感效应硫沉积对高含硫气井开发的影响分析

Advances in Geo-Energy Research, 2019, 3(3): 268-276

原文网址: https://www.yandy-ager.com/index.php/ager/article/view/142 

      高含硫气藏在开发过程中，随着压力降低，固体硫颗粒的析出会导致气体渗流通道堵塞，严重损害储层孔渗物性。因此，基于硫溶解度模型，研究高含硫气藏在考虑应力敏感效应情况下的储层压降和渗透率损害对高效开发此类气藏，具有实用意义。

       近日，中国地质大学（北京）汝智星博士等采用经典Roberts硫溶解度模型，结合胡景宏教授提出的溶解度模型，建立了一维径向渗流模型，通过求解结果对高含硫气藏储层伤害严重的区域和原因进行了分析，并通过求解数学模型对两种模型的准确性进行了验证，得到胡景宏教授的模型相对更为精确。

The impact of sulfur precipitation in developing a sour gas reservoir with pressure-sensitive effects

Zhixing Ru, Kang An, Jinghong Hu

(Published: 2019-06-22)

Corresponding Author and Email:

Jinghong Hu, hujinghong@cugb.edu.cn; 

ORCID: https://orcid.org/0000-0002-4102-1954

Citation: Ru, Z., An, K., Hu, J. The impact of sulfur precipitation in developing a sour gas reservoir with pressure-sensitive effects. Advances in Geo-Energy Research, 2019, 3(3): 268-276, doi: 10.26804/ager.2019.03.05.

ArticleType: Original article

Abstract：

    During the development of high sulfur gas fields, gaseous sulfur is likely to precipitate and deposit in the reservoirs due to the changes of temperature, pressure, and gas compositions. Therefore, how to establish an accurate prediction model of elemental sulfur solubility in gas mixtures is a key issue. At present, most scholars use Roberts elemental sulfur solubility model (SPE Reserv. Eng. 1997, 12(2): 118-123) to describe the damage caused by sulfur deposition in high-sulfur gas reservoirs. However, some scholars believe that the Roberts model needs to be improved and relevant works have been done. In this study, a one-dimensional radial production model is established using the HU model (J. Nat. Gas. Sci. Eng. 2014, 18: 31-38) and the Roberts elemental sulfur solubility model. These models can be used to describe the permeability and pressure changes caused by sulfur deposition more accurately. The results show that the permeability and pressure changes in the Roberts model are larger than that of which in the HU model and the pressure-sensitive effects may increase the reservoir damage. The comparison of the calculated results with the true values shows that the HU model is more accurate. This paper may change a number of views about sulfur deposition in high-sulfur gas reservoirs.

Keywords: High-sulfur gas, elemental sulfur solubility, sulfur deposition, pressure-sensitive effects, mathematical model.

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