盐水钻井液pH值影响因素和缓冲方法研究  

Study on Factors Affecting pH Value of Saltwater Drilling Fluids and Methods of Buffering pH Value

作　　者：李轩 黄维安[1] 贾江鸿 王有伟 李昀坪 王婧雯 LI Xuan;HUANG Weian;JIA Jianghong;WANG Youwei;LI Yunping;WANG Jingwen(School of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong 266580;Shengli Drilling Technology Research Institute of Sinopec,Dongying,Shandong 257017;The Fifth Oil Production Plant of Daqing Oilfield Co.,Ltd.,Daqing City,Heilongjiang 163513)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中石化胜利石油工程有限公司钻井工艺研究院,山东东营257017 [3]大庆油田有限责任公司第五采油厂,黑龙江大庆163513

出　　处：《钻井液与完井液》2018年第1期21-26,共6页Drilling Fluid & Completion Fluid

基　　金：国家科技重大专项课题“致密油气开发环境保护技术集成及关键装备”(2016ZX05040-005);国家自然科学基金项目“海洋深水水基钻井液恒流变性调控的化学、物理方法研究”(51374233);国家科技重大专项课题“海外油田环保钻丼液与防漏堵漏新技术”(2017ZX05032004-005)。

摘　　要：在深井钻井中钻遇盐膏层、盐膏泥复合盐层、高压盐水层等地层时,极易发生井下复杂情况,盐水钻井液在钻遇此类地层时,pH值极易快速降低,难以调节。实验考察了盐类、表面活性剂、有机胺等对饱和盐水基浆老化前后pH值的调控作用。结果表明,强碱弱酸盐、阴离子表面活性剂和非离子表面活性剂及2者间复配体系、有机胺等对饱和盐水基浆老化前后pH值均具有一定的缓冲效果。探究了矿化度及聚合物类处理剂、磺化处理剂等盐水钻井液常用处理剂对体系pH值的影响规律。结果表明,膨润土基浆矿化度增大会导致pH值的快速下降;聚合物类处理剂对饱和盐水基浆pH值影响较大;磺化处理剂对体系pH值有一定的缓冲作用。提出一种表面活性剂体系"0.3%WJG+0.1%SDBS"的pH缓冲办法,其对海水钻井液、高密度饱和盐水钻井液、高密度有机盐体系老化前后pH值具有较好的缓冲作用。In deep well drilling,the pH value o f saltwater drilling fluids decreases quickly and is difficxilt to control when drilling salt/gypsum formations,salt/gypsum/shale formations and formations with high-pressure salt water.In laboratory experiments,salts,surfactots and amines were investigated for their effects on adjusting and confrolling the pH value of sataated sallwater d rills before and after aging.It was understood from the experiments that salts formed by strong bases and weak acids,anionic surfactants,nonionic surfactants,the compounded products of anionic surfactant and nonionic surfactant,and amines all to some extents were able to buffer the pH value o f saturated drilling fluids before and after aging.Studies on the effects o f mud salinity,commonly used saltwater additives such as sulfonates on pH showed that an increase in the salinity led to quick decrease in the pH value o f bentonite base mud.Polymer additives obviously affected the pH value of saturated drilling fluids,Sulfonated additives,on the other hand,was more or less able to buffer the pH value of a mud.A surfactant compound composing 0,3%WJG and 0.1%SDBS has been presented as a new way of pH buffering.This surfactant compound is able to effectively buffer the pH values of seawater drilling fluid,high density saturated drilling fluid and high density organic salt drilling fluid.

关 键 词：盐水钻井液 pH值调节 表面活性剂 盐类 有机胺 

分 类 号：TE254.2[石油与天然气工程—油气井工程]