纳米SiO<sub>2</sub>/丙烯酰胺絮凝剂的合成及性能评价

杨浩; 岳前升; 赵庆美

doi:10.12358/j.issn.1001-5620.2022.06.008

纳米SiO₂/丙烯酰胺絮凝剂的合成及性能评价

doi: 10.12358/j.issn.1001-5620.2022.06.008

长江大学化学与环境工程学院, 湖北荆州434023

基金项目: 中海油横向项目“水基钻井液有害固相控制技术研究”(B2019H10025-1)

详细信息

作者简介:
杨浩，1997年生，长江大学化学与环境工程学院在读硕士研究生，主要研究材料与化工方向。电话 15835523669；E-mail：xiaoyangxiaohao@yeah.net

通讯作者:
赵庆美，电话 18972338966；E-mail：qingmeizhao123@163.com

中图分类号: TE254.4
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出版历程
- 收稿日期: 2022-06-13
- 修回日期: 2022-07-25
- 刊出日期: 2022-11-30

Synthesis and Performance Evaluation of Nano SiO₂ /Acrylamide Flocculant

Yangtze University, College Of Chemistry& Environmental Engineering, Jingzhou, Hubei 434023

摘要

摘要: 以正硅酸乙酯（TEOS）为原料,采用溶胶-凝胶法制备了不同粒径的SiO₂颗粒，对其表面进行改性后，与丙烯酰胺（AM）、二甲基二烯丙基氯化铵(DMDAAC)，采用反相乳液聚合法合成了纳米SiO₂/阳离子聚丙烯酰胺(SCPAM)。并对产品进行了测试与表征，根据表征结果确定该产品为目标产品。研究了SiO₂的粒径以及其加量对SCPAM分子量、水溶性、增黏性及絮凝性等性能的影响。实验结果表明，以粒径为15 nm的SiO₂加量占单体质量比0.9%时，所合成的SCPAM具有更佳的水溶性、增黏性及絮凝性，对以SCPAM为絮凝剂配制的钻井液的耐温、抗盐、抗剪切、耐老化及抗污染性进行了评价，结果显示当盐度达到30%，钻井液黏度仍保持在30 mPa·s左右；在老化时间达到96 h，钻井液黏度保持在33 mPa·s左右，展示了良好的抗盐性和抗老化性，且在有害固相含量低于5%、温度低于160 ℃时，该钻井液应用效果较好。
- 阳离子聚丙烯酰胺 /
- 纳米SiO₂ /
- 絮凝性 /
- 反相乳液聚合
Abstract: SiO₂ of different particle sizes were prepared through sol-gel method using tetraethyl orthosilicate (TEOS) as the raw material. The SiO₂ particles, after surface modification, was in turn used as raw material to react with acrylamide (AM) and dimethyl diallyl ammonium chloride (DMDAAC) to produce nano SiO₂/cationic polyacrylamide (SCPAM) through inverse emulsion polymerization. Characterization of the final product determines that it is the required product. Study on the effects of the SiO₂ particle size and concentration on the molecular weight, water solubility, viscosifying performance and flocculating capacity of SCPAM shows that SCPAM made from 15 nm SiO₂ at mass fraction of 0.9% of the whole reaction monomers has the best water solubility, viscosifying performance and flocculating capacity. Evaluation of a drilling fluid formulated with SCPAM as a flocculant shows that the drilling fluid has a final viscosity of about 30 mPa·s at salt concentration of 30%. After aging for 96 h, the viscosity of the drilling fluid is still about 33 mPa·s, meaning that the drilling fluid has good salt and high temperature resistance. It is also found that the drilling fluid works satisfactorily at drilled solids contents less than 5% and temperatures lower than 160 ℃.
- Cationic polyacrylamide /
- Nano SiO₂ /
- Flocculating property /
- Inverse emulsion polymerization

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图 1 SiO₂红外谱图

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图 2 SCPAM红外谱图

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图 3 合成产品扫描电镜图

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图 4 SCPAM和PAM的热重分析图

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图 5 SiO₂加量对SCPAM表观黏度的影响

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图 6 SCPAM不同SiO₂含量的不溶物含量

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表 1 SiO₂粒径尺寸对SCPAM-0.9的性能对比

粒径尺寸/nm	AV/mPa·s	分子量/×10⁶	不溶物/%	t_絮凝/min
≈300	21.00	8.85	0.075	508
≈160	23.25	8.95	0.069	506
≈90	25.50	9.51	0.053	498
≈15	26.25	9.48	0.049	494

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表 2 SCPAM的絮凝性能

SiO₂/%	t_絮凝/min	沉降介质体积/mL
0	515	106
0.2	506	110
0.5	501	103
0.7	491	88
0.9	494	76
1.0	504	74
1.2	509	91

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表 3 温度对钻井液流变性能的影响

T/℃	AV/mPa·s	PV/mPa·s	YP/Pa
80	38.75	19.5	19.25
100	38.50	19.5	19.00
120	37.50	19.0	18.50
140	35.25	19.0	16.25
160	30.75	18.0	12.75
180	20.00	12.0	8.00

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表 4 不同浓度盐分含量的钻井液性能

盐/%	NaCl			CaCl₂
盐/%	AV/mPa·s	PV/mPa·s	YP/Pa	AV/mPa·s	PV/mPa·s	YP/Pa
0	53.25	26.5	26.75	53.00	26.5	26.50
5	46.50	26.5	20.00	36.75	22.0	14.75
10	41.25	21.5	19.75	34.50	20.5	14.00
15	37.50	19.5	18.00	32.75	19.0	13.75
20	37.25	18.5	18.75	31.75	18.0	13.75
25	36.50	18.0	18.50	31.00	17.5	13.50
30	34.50	17.5	17.00	30.75	17.5	13.25

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表 5 钻井液耐老化性能

t_老化/h	AV/ mPa·s	PV/mPa·s	YP/Pa
0	37.50	19.0	18.50
16	38.50	19.5	19.00
32	38.00	19.5	18.50
48	36.50	18.0	18.50
64	36.00	17.0	18.00
80	34.50	17.0	17.50
96	33.25	16.5	16.75

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表 6 固相含量对钻井液性能的影响

膨润土/%	AV/mPa·s	PV/mPa·s	YP/Pa	钻井液D₅₀/µm
0	38.75	19.5	19.25	88.91
0.5	35.50	19.0	16.50	88.12
1	36.50	20.5	16.00	80.35
2.0	37.00	21.5	15.50	70.14
3.0	39.25	22.0	17.25	58.48
4.0	39.75	22.0	17.75	44.56
5.0	44.00	25.0	19.00	13.77

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表 7 剪切时间对钻井液的性能影响

t_剪切/min	AV/mPa·s	PV/mPa·s	YP/Pa
10	38.75	19.5	19.25
20	38.00	19.5	18.50
30	37.75	19.0	18.75
40	37.00	18.5	18.50
50	36.75	18.5	18.25
60	35.50	17.5	18.00

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