摘要
以甲基丙烯醇(MP)、小分子有机胺(HLA-3)、2-丙烯酰胺-2-2甲基丙磺酸(AMPS)和二甲基二烯丙基氯化铵(DMDAAC)为单体合成了一种新型页岩抑制剂LM-1,红外光谱表征结果显示该抑制剂为一种新型两性离子聚合物,室内考察了其抑制性能、热失重性能、抗盐性能、对泥页岩压入硬度的影响以及与钻井液的配伍性。结果表明,当LM-1的质量分数为2.0%时,现场泥页岩钻屑的滚动回收率能够达到90%以上,在LM-1水溶液中加入膨润土后,动切力较小,说明LM-1具有良好的抑制性能;当温度达到350℃之前,LM-1未发生明显的热降解,具有良好的热稳定性;LM-1具有良好的抗盐性能,能够适应高盐储层的钻井作业;现场泥页岩在2.0%LM-1溶液中浸泡后的压入硬度保留率能够达到原岩的75%以上;现场钻井液中加入LM-1后,黏度、切力和滤失量变化不大,说明LM-1与现场钻井液具有良好的配伍性。现场应用效果表明,A-2井二开施工未出现井壁失稳、垮塌以及起下钻困难等问题,施工过程顺利,能够满足泥页岩地层钻井对抑制性能的要求。
A new shale inhibitor LM-1 was synthesized from methacrylic alcohol(MP),small molecule organic amine(HLA-3),2-acrylamide-2-2-methylpropionic sulfonic acid(AMPS),and diallyl dimethyl ammonium chloride(DMDAAC).The inhibition performance,thermal weightlessness,salt resistance,influence on the indentation hardness of shale and compatibility with drilling fluid were investigated in laboratory.The IR characterization results show that the inhibitor is a new amphoteric ion polymer.Results show that when the mass fraction of LM-1 was 2.0%,the rolling recovery rate of mudstone cuttings reach over 90%.When bentonite is added into LM-1 aqueous solution,the dynamic shear force is reduced,indicating that LM-1 has good inhibition performance.When the temperature reaches 350°C,LM-1 do not undergo obvious thermal degradation and has good thermal stability.LM-1 has good salt resistance and can adapt to drilling operations in high salt reservoirs.The retention rate of indentation hardness of mudstone soaked in 2.0%LM-1 solution can reach more than 75%of the original rock.When LM-1 was added into drilling fluid,the viscosity,shear force,and filtrate loss chang slightly,showing that LM-1 has good compatibility with field drilling fluid.The field application results show that there are no problems of borehole wall instability,collapse,and drilling difficulties in the second opening of A-2 well.The construction process is smooth and meets the requirements of shale formation drilling for inhibition performance.
作者
王哲
张雄
张鹏
王会向
马超
WANG Zhe;ZHANG Xiong;ZHANG Peng;WANG Hui-xiang;MA Chao(School of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Drilling Fluid Branch of CNPC Xibu Drilling Engineering Company Limited,Karamay 834099,China)
出处
《科学技术与工程》
北大核心
2020年第2期563-568,共6页
Science Technology and Engineering
基金
国家科技重大专项(2017ZX05013)。
关键词
页岩抑制剂
两性离子
抑制性能
水基钻井液
应用效果
shale inhibitor
amphoteric ion
inhibition performance
water-based drilling fluid
application effect
作者简介
第一作者:王哲(1992-),男,汉族,山东东营人,硕士研究生,研究方向:石油与天然气工程,E-mail:986207321@163.com;通信作者:马超(1979-),男,汉族,陕西咸阳人,副教授,研究方向:石油与天然气工程,E-mail:mc19790924@126.com。
