高含盐废水回注稀油井区的可性行研究  

Feasibility Study of Reinjection of High Salinity Wastewater into Thin Oil Well Area

作　　者：李平原 周鹤 窦玉明 赵波 颜亨兵 李冬菊 LI Pingyuan;ZHOU He;DOU Yuming;ZHAO Bo;YAN Hengbing;LI Dongju(Xinjiang Keli New Technology Development Co.,Ltd.;Luliang Operation Area of Xinjiang Oilfield Company,CNPC;Fengcheng Operation Area of Xinjiang Oilfield Company,CNPC)

机构地区：[1]新疆科力新技术发展股份有限公司 [2]中国石油新疆油田公司陆梁作业区 [3]中国石油新疆油田公司风城作业区

出　　处：《油气田地面工程》2021年第3期33-38,共6页Oil-Gas Field Surface Engineering

基　　金：克拉玛依市级重大专项“采油、增产措施等过程中的作业废水处置与循环利用技术”(2018ZD003B)。

摘　　要：新疆风城超稠油油田锅炉给水采用离子交换树脂法来进行软化,在离子交换树脂再生过程中产生高含盐废水,高含盐废水的排放处理将造成高额的处理费用,同时造成环境污染。在水资源有限的情况下,将高含盐水回注稀油井区,能弥补稀油井区注水水源不足的问题,减少废水排放量。针对高含盐废水回注乌33稀油井区的效果进行研究,结果表明:高含盐废水经过“重力沉降+过滤”处理后水质满足注水指标,自身稳定性好,防膨率达到94%,但其与地层水配伍性较差,并对储层损害较大。通过投加浓度为100 mg/L防垢剂进行调节后,高含盐水与地层水的混合水阻垢率达到93.4%,悬浮物浓度可控制在5 mg/L以下,此时高含盐水对储层损害降为弱,储层渗透率略有增加,利于疏通注入水通道,降低注压,提高采收率。Xinjiang Fengcheng ultra-heavy oil field boiler feedwater is softened by ion-exchange resin method,producing high-salinity wastewater in the process of ion-exchange resin regeneration.The treatment of high-salinity wastewater will incur high treatment costs and may cause environmental pollution.In the case of limited water resources,thin oil well area high-salinity wastewater re-injection can make up for the problem of insufficient injection water source and reduce wastewater discharge.The effect of re-injecting high-salinity wastewater into Wu 33 thin oil well area is studied.The results show that the quality of the high-salinity wastewater after gravity settling and filtration treatment can meet the water injection standard.Besides,the treated wastewater exhibits a high stability with an anti-swelling rate of 94%.However,the wastewater shows a poor compatibility with the formation and a strong damage to the reservoir.After adding 100 mg/L of antiscalant,the scale inhibition rate of the mixture of high-salinity water and formation water can reach 93.4%,and the suspended matter content can be controlled below 5 mg/L.Meanwhile,the damage of the high-salinity wastewater to the reservoir is weak and the permeability of the reservoir increases slightly,which is beneficial to the dredging of the water-injection channel,reducing the injection pressure,and increasing the recovery rate.

关 键 词：高含盐废水 地层损害 配伍性 阻垢剂 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]