Treatment Of H₂S In Crude Oil Wells In Gudao Oilfield

With the development of tertiary oil recovery in oilfields,the research on the development of heavy oil block is becoming more and more mature.Most crude oils in Gudao Oilfield are heavy oil and at present,steam flooding is adopted in many blocks.In recent years,with the environmental protection situation is becoming more and more serious,the treatment of hydrogen sulfide in oil well has become a hot topic.It was found that the H₂S concentration of high temperature oil wells changes regularly with the implementation of steam injection and much higher than that of normal temperature oil wells.In this paper,indoor experiments and field tests are combined to study a kind of desulfurater especially suitable for high temperature steam flooding wells which is the innovation of this paper.Through the tracking detection and analysis of steam flooding wells and steam huff and puff wells in Gudao Oilfield,two typical blocks were selected to detect and analyze the composition of core,crude oil and produced water to find out the cause of hydrogen sulfide formation in Gudao Oilfield.High temperature and humidity accelerate the hydrothermal cracking process of sulfur organic compounds in the formation.However,there is not a very effective method to remove hydrogen sulfide from high temperature oil wells.Most liquid desulfurizers have poor high temperature resistance and poor high temperature desulfurization effect.The number of oil Wells is large and relatively dispersed,and the solid desulfurization method is not suitable for the source control of hydrogen sulfide in oil wells.Therefore,the purpose of this paper is to study a high temperature resistant liquid desulfurizer for wellhead injection.The desulphurization efficiency of aldehydes is high,but its molecular weight is small and it is unstable when it is heated,so the desulphurization effect is greatly reduced after heating.In this paper,based on the study of aldehydes desulfurizer,the structure of urea-formaldehyde resin was introduced to increase the space barrier by using tripolyglyoxal hydrate in an attempt to improve the high temperature resistance of the desulfurizer.Under the guidance of this idea,this paper compares the sulfur capacity and other parameters of the new high temperature resistant desulfurizer,DS-4,with the triazine desulfurizer currently in use in Gudao Oilfield,and optimizes field experiments to provide technical support for H₂S treatment of high-temperature oil Wells in Gudao Oilfield.