论文部分内容阅读
胜利油田孤岛稠油区块8个井组转蒸汽驱一年后检测出高浓度硫化氢气体,严重影响安全生产。通过室内物理模拟实验,产生硫化氢物质基础研究及现场调查跟踪监测,对胜利油田孤岛中二北蒸汽驱硫化氢产生机理及主要影响因素进行研究,结果表明孤岛中二北蒸汽驱硫化氢产生机理主要为含硫有机化合物的热化学裂解反应,地层温度达到200℃,开始裂解产生H2S,物质基础研究表明,中二北原油含硫量在1.62%~2.66%,属于中-高硫原油,为热化学裂解反应提供丰富的硫的来源,地层水硫酸根含量平均只有为12.2mg/L,硫酸盐的热化学还原反应产生H2S的物质基础不充分。温度和反应时间是影响硫化氢产生的主要因素,温度越高产出速度越快,反应时间越长,产生硫化氢量越多,这与现场硫化氢分布特征相一致。
8 wells in Shengli Oilfield Gudao heavy oil block turn to high-concentration hydrogen sulfide gas after one year of steam flooding, seriously affecting safety in production. Through the physical simulation experiments in laboratory and the basic research on hydrogen sulfide production and on-the-spot investigation and monitoring, the mechanism and main influencing factors of hydrogen sulfide generation from the Northern Beihai steam in Shengli Oilfield are studied. The results show that the mechanism of H2S production Mainly for the thermochemical cracking reaction of sulfur-containing organic compounds, the formation temperature reached 200 ℃, began to crack H2S, the material basic studies show that the sulfur content of the Second Middle North crude oil 1.62% ~ 2.66%, are medium - high sulfur crude oil, The thermochemical cleavage reaction provides a rich source of sulfur with an average sulfate concentration of only 12.2 mg / L in the formation water and insufficient material basis for the thermochemical reduction of sulfate to produce H2S. Temperature and reaction time are the main factors affecting the production of hydrogen sulfide. The higher the temperature is, the faster the output is. The longer the reaction time is, the more hydrogen sulfide is produced, which is consistent with the distribution of on-site hydrogen sulfide.