硫化氢在胜利原油中的溶解及释放行为

Dissolution and Release Behavior of Hydrogen Sulfide in Shengli Crude Oil

在原油生产过程中,随着体系温度和压力的改变,H2S可能从原油中释放,带来安全问题。目前油田采用的注蒸汽热采模式会加大H2S的危害。本文针对胜利油田某原油及采出液(原油和地层水的混合物)开展研究,将原油或采出液置于高温高压反应釜中进行高温处理、然后降温至50℃提取气样、对气样进行色谱分析,探索该原油中H2S的产生机制。研究发现,采出液经过330℃高温处理后H2S释放量较小,低于该原油经330℃高温处理的H2S释放量;该原油经200℃、85℃处理后均释放出H2S,且原油经过200℃或85℃处理,释放的H2S中硫元素与所取原油中硫元素的比例分别为32.3%和34.5%,H2S释放量较为接近。该原油在高温处理过程中,释放的H2S来自于原油中溶解的H2S,当原油和地层水共存时,部分释放出的H2S可以再溶解于地层水中而使H2S释放量降低。表6参13。

In the process of crude oil production,the H2S maybe release from the crude oil with the change of system temperature and pressure,resulting in potential safety hazards.At present,steam injection thermal production mode will aggravates the harm of H2S.The H2S release in an extraction liquid or the corresponding crude oil of Shengli oilfield after treatment at different temperatures was investigated and H2S production mechanism was mentioned.The crude oil or extraction solution was placed in an autoclave for high temperature treatment,then cooled to 50℃ to extract gas samples,and the gas samples was analyzed by gas chromatography.It was found that after 330℃high temperature treatment,the H2S release from extraction liquid was less than that from the corresponding crude oil.Furthermore,the H2S release values of the crude oil treated at 200℃or 85℃were similar to each other,and the H2S release values were relatively large.The sulfur in released H2S reached up to 32.3%or 34.5%of the sulfur in the treated crude oil.Moreover,the study indicated that the main source of H2S released in the experiment was the H2S dissolved in crude oil.As crude oil coexisted with the formation water,some H2S dissolved in the formation water and reduced the H2S release.