Abstract:
Objective In Suizhong 36-1 reservoir A, bio-competitive exclusion technology was used to treat hydrogen sulfide produced by sulfate-reducing bacteria introduced by seawater injection. Taking the reservoir as the research object, the main controlling factors and mechanism of H2S growth are studied.
Methods The typical oil wells in the reservoir were selected to investigate the hydrogen sulfide content, sulfide content and microbial content of different oil wells during the withdrawal period. The growth curve of SRB was observed, and the main controlling factors and mechanism of H2S growth were studied.
Results The bio-competitive exclusion method could inhibit the growth of SRB and the H2S concentration of all single wells was reduced to below 30 mg/m3. During the drug withdrawal period, the growth trend of H2S in the reservoir conformed to the Compertz model. The single well A01, A04, A17, A20, and A22 models had a fitting degree above 0.8, and statistics of variancethe was high, and the significance was between 0.001 and 0.002.
Conclusion H2S is not controlled by reservoir production dynamics, seawater provides a rich source of sulfate nutrients, and the main controlling factor for H2S growth in reservoir A of Suizhong 36-1 oilfield is the sulfate ion content in the reservoir. The reservoir has formed a very stable ecological flora, and the stable ecosystem can automatically eliminate the sulfate introduced from the outside, thereby systematically controlling the growth of H2S.