摘要
水玻璃-氯化钙体系是常用的油井堵漏材料,但是水玻璃和氯化钙一接触即快速反应,只能采用双液法进行施工,工序复杂。因此拟对氯化钙进行控释,以期能够将水玻璃-氯化钙混合同时泵注,简化施工。该研究通过使用树脂体系对氯化钙进行包裹完成氯化钙的控释。通过改变体系中氯化钙的加量、交联剂的加量以及单体的种类及配比,考察以上3种因素对控释效果的影响。研究发现,通过树脂对氯化钙进行包裹时,氯化钙与单体的质量比为1∶4、交联剂加量为6%,可将水玻璃-氯化钙体系失去流动性时间延长至105 min。将已包裹氯化钙的树脂粉末进行二次包裹时,氯化钙与单体的质量比为1∶2、一次包裹二次包裹交联剂加量均为6%时,可将水玻璃-氯化钙体系失去流动性时间延长至110 min。在二次包裹的树脂体系中加入氯化钠,可将体系失去流动性时间延长至180 min。通过红外光谱和SEM谱图分析发现,吸水树脂通过减少氯化钙与水玻璃的接触面积来减缓反应的进行,树脂本身不参与水玻璃与氯化钙的反应进程。
Waterglass-calcium chloride compound is a commonly used lost circulation material.When use this material to control mud losses,the waterglass reacts instantly with calcium chloride as soon as the two chemicals are brought together.Thus,mud loss control with waterglass-calcium chloride compound can only be performed in a complicated“two-liquids”method.To make things easy,the release of calcium chloride from the compound lost circulation material is controlled to try to pump the mixture of waterglass and calcium chloride in one operation.In this study,a resin is used to wrap calcium chloride for controlled release of calcium chloride.By changing the quantities of calcium chloride and the crosslinking agent as well as the type and ratio of the monomers,the effects of these factors on the release of calcium chloride can be understood.The study shows that when wrapping calcium chloride with the resin,if the mass ratio of calcium chloride and the monomer is 1∶4 and the concentration of the crosslinking is 6%,then the time for the waterglass-calcium chloride system to lose fluidity can be extended to 105 min.When the powdered resin wrapping up calcium chloride is rewrapped,if the mass ratio of calcium chloride and the monomer is 1∶2,and the concentrations of the crosslinking agent are both 6%in the first and secondary wrapping,the time for the waterglass-calcium chloride system to lose fluidity can then be extended to 115 min.If sodium chloride is added in the secondary wrapping,then the time for the system to lose fluidity can be extended to 180 min.Analyses with IR spectrum and SEM show that the water-absorbing resin retards the reaction between calcium chloride and waterglass by reducing the contact area between the two chemicals,while the resin itself does not participate in the reaction between waterglass and calcium chloride.
作者
殷慧
柳华杰
安朝峰
步玉环
郭胜来
宋文宇
屈俊峰
苏国平
YIN Hui;LIU Huajie;AN Chaofeng;BU Yuhuan;GUO Shenglai;SONG Wenyu;QU Junfeng;SU Guoping(Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)),Ministry of Education,Qingdao,Shandong 266580;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580;PetroChina Tuha Oilfield Company Development Division,Hami,Xinjiang 839000;SINOPEC North China Petroleum Engineering Co.,Ltd,Zhengzhou,Henan 450006;Henan Science and Technology Innovation Promotion Center,Zhengzhou,Henan 450008)
出处
《钻井液与完井液》
CAS
北大核心
2024年第2期239-245,共7页
Drilling Fluid & Completion Fluid
基金
国家青年基金“水合物层固井水泥热能存储剂载体研制及承载机理研究”(51804332)
国家面上基金“深水油气井固井水泥传质传热过程中浅层水合物稳定机理”(51974355)。
关键词
氯化钙-水玻璃复合堵漏体系
氯化钙
控释
树脂
Compounded calcium chloride-waterglass lost circulation material
Calcium chloride
Controlled release
Resin
