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随着天然气勘探开发速度的加快,鄂尔多斯气田井场废泥浆产生量越来越大,固化处理后将其填埋于有防渗层的泥浆池中是目前该区域最常用的方法,但国内外就气田井场泥浆池防渗层对池内污染物实际阻滞效果的研究报道较少。为研究上述处理方法的实际环境效应,以2010年盆地内正在开发气井井场泥浆池内预固化处理沉淀物的分析结果为参照,选择其中污染程度较为严重的石油类、COD、硫化物和砷、钡、镍、铅、铜4种为重点污染物,选择2005—2009年分别投入使用的5个气田井场废弃泥浆池为考察对象,分析研究了防渗层投运时间对不同污染物阻滞作用的影响。结果表明,投运1年的防渗层可阻留污染物90%以上,投运2年以上的防渗层对污染物的阻滞作用有不同程度下降,投运5年的防渗层对所监测污染物的阻滞作用最好的是钡(40.14%)、最差的为硫化物(10.89%),结合不同时间防渗层破损状况和其对污染物的阻滞效率的变化情况,说明机械刺穿和不均匀降是导致防渗层在研究区域的环境下阻滞功能退化较快的主要原因。
With the acceleration of natural gas exploration and development, the production of waste mud in the wellsite of Ordos gas field is getting larger and larger. It is the most commonly used method in this region to landfill in a mud pool with impermeable layer after curing treatment. However, There are few reports on the actual blocking effects of the mud pool seepage prevention layer in the well field on the reservoir. In order to study the actual environmental effects of the above treatment methods, taking the analysis result of the pre-solidification sedimentation in the mud pond of the gas well field under development in 2010 as the reference, the petroleum, COD, sulfide and arsenic with more serious pollution degree were selected, Barium, nickel, lead and copper as the key pollutants, we selected 5 wells in 2005 and 2009, respectively, as the study object, and analyzed the effect of anti-seepage layer put into operation on different pollutants block Effect of the effect. The results show that the anti-seepage layer put into operation for one year can retain more than 90% of the pollutants, the anti-seepage layer put into operation for more than two years has a certain extent of drop of the blocking effect on pollutants, and the anti-seepage layer put into operation for five years Barium (40.14%) was the best one to block the pollutants and the worst was sulfide (10.89%). Combined with the damage status of the impermeable layer and the change of its blocking efficiency, It shows that the mechanical piercing and non-uniform drop are the main reasons that the barrier layer degrades rapidly in the environment of the study area.