一种重晶石螯合剂完井液体系研究  

Study on a completion fluid system with barite chelating agent

作　　者：郭海峰 曾佳 GUO Hai-feng;ZENG Jia(COSL Supply Chain Management Center,Sanhe 065201,China;Jingzhou College,Jingzhou 434020,China)

机构地区：[1]中海油服采办共享中心,河北三河065201 [2]荆州学院,湖北荆州434020

出　　处：《化学工程师》2024年第1期47-51,共5页Chemical Engineer

基　　金：湖北省教育厅科学研究计划指导性项目(B2021431)。

摘　　要：重晶石加重钻井液在正压差下易进入储层岩石孔喉中,严重堵塞渗流通道,污染地层,极难解除,影响油气井产量。为了解决上述问题,本文通过采用1,3-二溴丙烷改性DTPA制备一种聚集体螯合剂AHJ-1,增大对重晶石的溶解能力,并协同催化剂、转化剂和破胶剂形成一套重晶石螯合完井液体系。实验结果表明,改性后形成的聚集体螯合剂对重晶石的溶解能力更强,在催化剂草酸、转化剂K_(2)CO_(3)作用下,Ba^(2+)与AHJ-1分子的反应活性得到提高,且促进低溶解度BaSO_(4)转化为高溶解度BaCO_(3),增强AHJ-1溶液对重晶石的溶解度。另外,重晶石螯合完井液体系有效溶解重晶石泥饼,对岩芯孔喉中泥饼固相进行溶解反应,提高了污染岩芯渗透率恢复值,有利于提高油气产能。Barite-weighted drilling fluid is easy to enter the reservoir rock pore throat under the positive pressure difference,seriously blocking the seepage channel and polluting the formation,which is extremely difficult to remove and affects the output of oil and gas Wells.In order to solve the above problems,a chelating agent AHJ-1 was prepared by using 1,3-dibromopropane modified DTPA to increase the dissolution ability of barite,and a set of barite chelating completion fluid system was formed together with catalyst,conversion agent and glue breaker.The experimental results showed that the modified chelating agent had a stronger ability to dissolve barite.Under the action of oxalic acid and conversion agent,the reactivity of Ba^(2+)and AHJ-1 molecules was improved,and the conversion of low solubility BaSO_(4) to high solubility BaCO_(3) was promoted,and the solubility of AHJ-1 solution to barite was enhanced.In addition,the barite chelated completion fluid system effectively dissolved the barite mud cake and the mud cake solid phase in the core pore throat,which improved the permeability recovery value of polluted core and was conducive to improving oil and gas productivity.

关 键 词：螯合剂 完井液 破胶剂 储层保护 氨基类化合物 

分 类 号：TE257[石油与天然气工程—油气井工程]