基于现有固控设备的废钻井液处理及利用技术

发布时间：2018-02-09 17:38

本文关键词： 环境保护废钻井液破胶固液分离重复利用长庆气田　出处：《钻井液与完井液》2017年01期 　论文类型：期刊论文

【摘要】：为了达到环境保护要求,长庆钻井采用破胶-固液分离的技术,对废弃钻井液进行后期处理。针对常见破胶剂多为单一作用,破胶速度慢,效率低,自制一种复合型破胶剂CQPJ-1为一种破胶剂,其能够使黏土胶体和悬浮颗粒整体的电荷量减小,聚结稳定性下降,同时能够使高分子材料氧化分解,产生初级自由基,并引发连锁自动氧化反应,使分子量急剧降低。同时优选了一种分子量适中的高分子絮凝剂CQXN-1,它具有的阳离子和长分子链可将失稳的黏土颗粒包裹起来,形成的聚集体较无机絮凝剂所形成的絮凝聚集体更加紧密牢固,因而更有利于机械脱水。室内实验同时对双氧水、高锰酸钾、亚磷酸钠和CQPJ-1等破胶剂以及聚合氯化铝、聚合氯化铁、硫酸铝和CQXN-1等絮凝剂进行了对比评价。结果表明,通过调节废弃钻井液的pH值调整为6.0~6.5,加入2%破胶剂CQPJ-1,破胶3 h,最后加入0.15%絮凝剂CQXN-1,利用钻井队配备的离心机进行固液分离,选择离心机转速为2 200 r/min,分离效率和效果达到预期目标。处理后的液相污染指标大幅下降,重复利用配制钻井液后各项指标也符合钻井施工要求。
[Abstract]:In order to meet the requirements of environmental protection, Changqing drilling adopts the technology of separating gel-breaking and solid-liquid, and carries on the post-treatment of waste drilling fluid. In view of the fact that the common gel breaking agents are mostly single, the breaking speed is slow and the efficiency is low. A compound gel breaking agent, CQPJ-1, is made by ourselves. It can reduce the total charge of clay colloid and suspended particle, decrease the stability of coalescence, and make the polymer material oxidize and decompose to produce primary free radical. At the same time, a polymer flocculant CQXN-1 with moderate molecular weight was selected. The cations and long molecular chains of CQXN-1 can encapsulate unstable clay particles. The resulting aggregates are more compact and solid than those formed by inorganic flocculants, and are therefore more conducive to mechanical dehydration. Laboratory experiments have also been carried out on gel breaking agents such as hydrogen peroxide, potassium permanganate, sodium phosphite and CQPJ-1, as well as polyaluminium chloride. The flocculants such as polyferric chloride, aluminum sulfate and CQXN-1 were compared and evaluated. By adjusting the pH value of the waste drilling fluid to 6.0 ~ 6.5, adding 2% gel breaker CQPJ-1, breaking the glue for 3 h and finally adding 0.15% flocculant CQXN-1, the solid liquid separation is carried out by using the centrifuge equipped by the drilling team. When the speed of centrifuge is 2 200 r / min, the separation efficiency and effect reach the expected goal. After treatment, the liquid phase pollution index is greatly reduced, and the indexes of drilling fluid after reuse are also in line with the requirements of drilling operation.
【作者单位】：川庆钻探工程有限公司长庆钻井总公司;
【分类号】：TE254

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