论文部分内容阅读
在酸性气藏中,元素硫的沉积会减小气体的流动空间,其进一步的沉积会堵塞气体的流通通道,导致气井产量降低。为加强对高含硫气藏地层中单质硫沉积规律的认识,进行了以下理论研究:考虑元素硫吸附效应,建立一套系统的高含硫气藏元素硫地层沉积预测模型,并利用该模型对某油田实例进行计算;在地层水体存在的条件下,对硫沉积带来的影响。结果表明:当硫吸附效应或者地层水体存在时都会进一步加大硫沉积量,并且随着时间的推移,影响更加明显;在离气井较远的地带,硫吸附效应的影响更强。在理论研究的基础之上,进行了单质硫的聚集实验及其在岩石空隙中的分布规律实验。通过对实验结果的分析,硫的聚集是从纳米级的单质硫晶体聚集形成面状单质硫,再逐渐形成层状似的单质硫;单质硫在孔隙中的分布规律为:孔隙越大,硫沉积量越大。
In sour gas reservoirs, the deposition of elemental sulfur reduces the gas flow space and further deposition can block the gas flow channels, resulting in a reduction in gas well production. In order to strengthen the understanding of the law of elemental sulfur deposition in the strata of high-sulfur gas reservoirs, the following theoretical studies are carried out: A set of systematic prediction models of elemental sulfur deposition in high-sulfur gas reservoirs are established by considering the elemental sulfur adsorption effect. Calculate an example of an oil field; influence on sulfur deposition in the presence of formation water. The results show that when the sulfur adsorption effect or formation water body will further increase the amount of sulfur deposition, and with the passage of time, the impact is more obvious; in the farther away from the gas wells, sulfur adsorption effect more strongly. Based on the theoretical study, the experiments of elemental sulfur accumulation and its distribution in rock voids were carried out. Through the analysis of the experimental results, the aggregation of sulfur is the formation of planar elemental sulfur from the nanoscale elemental sulfur crystals and the gradual formation of layer-like elemental sulfur. The distribution rules of elemental sulfur in the pores are as follows: The greater the amount of deposition.