石油化工高等学校学报2024，Vol.37Issue(5)：28-37,10.DOI:10.12422/j.issn.1006-396X.2024.05.004
大庆龙西低渗油藏开发中硫化氢生成机理研究
Study on the Causes of Hydrogen Sulfide Generation in Daqing Longxi Low-Permeability Reservoir Development
摘要
Abstract
During the development of the Fuyu oil reservoir in the Longxi block of Daqing,hydrogen sulfide(H2S)was discovered and exceeded the threshold value(15.0 mg/m3),but its generation mechanism is still unclear.To investigate this,the mechanism of H2S generation in the Longxi block formation was investigated through laboratory experiments on H2S generation,combined with numerical simulations using PHREEQC and CMG software.The results show that the mechanism of H2S generation in high-temperature reservoirs(100～125℃)is sulfate thermochemical reduction reaction,with viscosity of H2S generated ranges from 3.20 mg/m3 to 6.10 mg/m3.In low-temperature reservoirs(≤60℃),the mechanism of H2S generation is sulfate-reducing bacteria reduction reaction,with a maximum H2S viscosity of up to 29.70 mg/m3.Fracturing fluid reduces the temperature in the near-wellbore zone,promoting SRB proliferation,and the viscosity of H2S generated in a short time increases by 7.5 times compared to the sulfate-reducing bacteria reduction reaction in produced water.The mass concentrations of H2S generated by the reaction of 1 m3 acid with the core and plug containing 0.80 mol FeS are 3 330.69 mg/m3 and 11 466.75 mg/m3,respectively.Therefore,fracturing and acidification are the main mechanisms for the generation of H2S during the development of the Fuyu oil reservoir in the Longxi block.关键词
硫化氢/硫酸盐还原菌/硫酸盐热化学还原反应/压裂液/酸化/地层温度Key words
Hydrogen sulfide/Sulfate-reducing bacteria/Sulfate thermochemical reduction reaction/Fracturing fluid/Acidification/Formation temperature分类
能源科技引用本文复制引用
孙红宇,钟立国,张海龙,林庆祥,王珂昕,杨光,杨玉财..大庆龙西低渗油藏开发中硫化氢生成机理研究[J].石油化工高等学校学报,2024,37(5):28-37,10.基金项目
中国石油天然气股份有限公司重大科技专项"难采储量有效动用技术研究与试验"(2016E-0210). （2016E-0210）
