摘要
为了解决泥页岩地层钻井过程中井壁失稳的难题,研制出一种兼具强抑制性和优良环保性的水基钻井液页岩抑制剂——聚赖氨酸,并对其性能进行了评价。评价过程及结果如下：1借助红外光谱、核磁共振、电感耦合等离子质谱、热重分析等方法对其进行了化学表征;2通过线性膨胀实验、泥页岩热滚回收实验和膨润土造浆实验等手段,系统地评价了该抑制剂对泥页岩的抑制性能;3抗温性能和p H值适应性评价结果表明,温度在180℃以内、p H值在7~10范围内该抑制剂均能发挥良好的抑制作用;4生物降解试验结果表明,该抑制剂易于降解,环保性能优异。结论认为,聚赖氨酸具有优异抑制性能的原因在于其能够有效地中和泥页岩中膨润土表面负电荷,将表面Zeta电位降低至接近零点,而又不会造成电性反转,从而最大限度地压缩扩散双电层,使泥页岩不易分散;并且其抑制作用优于KCl、小阳离子、Ultrahib等目前常用的几种抑制剂。
Polylysine was developed to solve the problem of borehole wall instability during shale drilling. It is a type of environmentally friendly water-based drilling fluid shale inhibitor with a high inhibition performance. In this paper, polylysine was evaluated on its shale inhibition performance. First, it was chemically characterized by means of FT-IR, NMR, ICP-MS and TGA. Second, its shale inhibition performance was systematically evaluated via linear swelling tests, shale hot aging recovery tests and bentonite grout preparation tests. Third, its heat resistance and pH adaptability were evaluated. It is shown that polylysine is outstanding in shale inhibition capacities in the conditions with temperature below 180 ~C and pH in the range of 7-10. And fourth, biodegradation tests were performed. It is indicat- ed that polylysine is an environmentally friendly shale inhibitor that can be easily biodegraded. Research results show that the reason for the predominant inhibition capacity of the polylysine is that it can neutralize negative charges on the surfaces of bentonite and reduce the surface Zeta potential to near zero. And besides, no electric reverse is induced, so diffuse electric double layers can be compressed to the maximum extent. Therefore, shale diffusion does not easily happen. To sum up, the polylysine is superior to several commonly used shale inhibitors （e.g. KC1, NW-1 and Ultrahib） in terms of inhibition capacity.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2016年第2期84-91,共8页
Natural Gas Industry
基金
国家高技术研究发展计划(863计划)项目课题(编号:2013AA064803)
中国石油天然气集团公司科学研究与技术开发项目"重大钻井技术集成配套与装备现场试验"(编号:2014D-4407)
国家自然科学基金创新研究群体科学基金(编号:51221003)
国家自然科学基金面上项目(编号:51474231)
国家自然科学基金重点支持项目(编号:U1262201)
关键词
钻井液
页岩抑制剂
抑制性能
抗温性能
pH值适应性
聚赖氨酸
环保型
井壁稳定
Drilling fluid
Shale inhibitor
Inhibition performance
Heat resistance
pH adaptability
Polylysine
Environmentally friendli- ness
Borehole stability
