Exploration Of Waste Disposal And Ecological Utilization Technology In The Oil And Gas Exploitation

In the process of exploitation of oil and gas will produce heavy metals,oil and other pollutants,these substances with drilling mud is lifted to the ground,they will be discharged into the water,air and soil without treatment on time,have a certain impact on the surrounding environment.There are many organic pollutants and heavy metals pollution research on processing of oil and gas exploration of natural water,but on land oil and gas exploitation area of soil pollution is less,and the drilling mud after treatment for the study of ecological improvement is rarely seen.This paper aimed at the drilling mud which with heavy metals,oil pollutants of Tarim Oilfield was studied.The experimental system consists of 3 different soil samples include directly dehydrated drilling mud,drilling mud after solidification,and the drilling mud with sulfonated asphalt and phenolic resin.Combined with the engineering practice and research to optimize the pollutant curing scheme,the final selection of ferric chloride as breaking agent,fly ash,calcium oxide,cement as curing agent.In this paper the interdisciplinary experiments in many candidate plants in drought and salt resistance and strong vitality,has certain enrichment or decomposition ability for heavy metal or oil,can effectively improve the soil plant.In a large amount of literature and the actual situation of Tarim Oilfield,alfalfa and elaeagnus angustifolia as the plants of ecological restoration were selected.In the laboratory,a large number of systemic germinating and transplanting experiment were made,based on mastering the growth rules and restrictions,determined the ratio of different kind of soil to meet plant survival,and ultimately determine the proportion of out-soil and drilling mud which after curing and sand soil was 3:1:1.Then according to the proportion of the soil did a series of soil column experiments,compared with the national water quality standard to explore under the effect of leaching contaminant infiltration,3 soil column was designed,conducted a series of27 experiments,won the 216 experimental data,the test including Cu,Cr,Cd,Pb,As,Hg,petroleum and pH indicators.Founded the effect of seepage is more obvious that without curing processing experiment of soil,it is possible to pollute groundwater.However seepage after curing processing experiment of soil pollutants has been significantly control,and lateraldiffusion in the process of vertical migration of pollutants,the pollutant concentration decreases and the changes of contents of heavy metals and the change regularity of pH value of the filtrate in the basic positive correlation,oil substances and heavy metals with water migrates downward,heavy metal migration ability are stronger.