Study on the formation mechanism of H2S in offshore thermal recovery oilfield
With the in-depth development of offshore heavy oil fields in China,the scale of thermal steam flooding is gradually expanding,and the corresponding H2S series problems are becoming more and more prominent.H2S not only endangers human health,but also corrode metal equipment,seriously affecting the safe and stable operation of production.In this paper,L heavy oil field is taken as an example.On the basis of investigating the reservoir profile and H2S generation of the target oil field,the genetic mechanism of H2S in offshore thermal recovery oil field is explored by means of gold tube thermal simulation experiment and chromatographic analysis.The experimental results show that the source of H2S in L heavy oil field is mainly crude oil and formation water,and cuttings can play a catalytic role.Temperature and time are the main controlling factors affecting H2S.The higher the temperature and the longer the time,the higher the amount of H2S generated.The main reason for the formation of H2S in L oilfield is due to the formation hydrothermal cracking and sulfate reduction reaction.The research results can provide exploration ideas for the study of H2S genesis in other thermal recovery oilfields,and point out the research direction for H2S treatment in oilfields.
thermal recovery oilfieldH2Sthermal simulation experiment of gold tubesourcetemperaturemechanism
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