油基钻井液用改性锂皂石增黏提切剂

倪晓骁; 史赫; 程荣超; 张家旗; 王建华

doi:10.12358/j.issn.1001-5620.2022.02.001

油基钻井液用改性锂皂石增黏提切剂

doi: 10.12358/j.issn.1001-5620.2022.02.001

中国石油集团工程技术研究院有限公司, 北京102200

基金项目: 中国石油天然气集团有限公司前瞻性基础性战略性技术攻关课题“高端钻完井处理剂和固井外加剂（超高温、极低温、纳米、超分子）研制”（2021DJ4401）；中国石油天然气集团有限公司科学研究与技术开发课题“油田井筒工作液关键化学材料的开发与应用”（2020E-2803（JT））

详细信息

作者简介:
倪晓骁，博士，工程师，现在从事油基钻井液技术研究工作。电话（010）80162064；E-mail：nixxdr@cnpc.com.cn

中图分类号: TE254.4
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出版历程
- 收稿日期: 2021-10-12
- 修回日期: 2021-12-11
- 录用日期: 2021-11-21
- 刊出日期: 2022-06-23

A Modified Hectorite Viscosifier and Gelling Agent for Oil Based Drilling Fluids

CNPC Engineering Technology R & D Company Limited, Beijing 102200

摘要

摘要:
以正辛基三乙氧基硅烷和锂皂石为原料，利用溶胶-凝胶法一步合成了油基钻井液用增黏提切剂改性锂皂石MLap-1，分别利用红外光谱、热重分析、透射电镜和表面润湿性对其单体进行表征，证明其合成成功。通过对改性锂皂石MLap-1单剂评价发现，该剂能够提高油水比为80∶20乳液的乳化效率和破乳电压，在0.3%加量下，乳液破乳电压值达到1200 V以上，使得乳液的表观黏度和动切力由12 mPa·s和0 Pa增大至23 mPa·s和10 Pa，同时能够抗200 ℃高温。以改性锂皂石MLap-1为基础构建的高密度油基钻井液在200 ℃老化后，其动切力维持在4 Pa以上，低剪切速率切力维持在3 Pa以上，破乳电压高于1000 V，滤失量低于5.0 mL，很好地维护了钻井液的悬浮稳定性，保持了良好的乳化稳定性和降滤失效果。为油基钻井液进一步钻探深井、超深井提供了技术支持。
- 增黏提切剂 /
- 油基钻井液 /
- 悬浮稳定 /
- 高密度
Abstract:
A modified hectorite viscosifier and gelling agent, MLap-1, for oil based drilling fluids, has been developed through one-step sol-gel method using triethoxyoctylsilane and hectorite. Characterization of the product with IR spectroscopy, TGA, TEM and surface wettability has proved the success of the synthesis. Evaluation of MLap-1 showed that it can improve the emulsion efficiency and electric stability of 80∶20 (O/W) emulsion; at 0.3% concentration of MLap-1 the electric stability of the emulsion was at least 1,200 V, and the apparent viscosity and yield point of the emulsion were increased from 12 mPa·s and 0 Pa to 23 mPa·s and 10 Pa, respectively. A high density oil based drilling fluid treated with MLap-1, after aging at 200 ℃, had its yield point maintained at above 4 Pa, low-shear-rate yield point above 3 Pa, electric stability above 1,000 V, and filtration rate less than 5.0 mL. These data indicate that MLap-1 is able to maintain the oil based drilling fluid in good suspension stability, good emulsion stability and good filtration control. The development of MLap-1 can be used to technically support the deep and ultra-deep drilling with oil based drilling fluids.
- Viscosifier and gelling agent /
- Oil based drilling fluid /
- Suspension stability /
- High density

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图 1 改性锂皂石MLap-1反应示意图

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图 2 改性锂皂石MLap-1样品的红外光谱图

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图 3 改性锂皂石MLap-1热重分析曲线

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图 4 锂皂石改性前后透射电镜图

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图 5 锂皂石改性前后表面润湿性能对比图

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图 6 不同浓度改性锂皂石MLap-1 对乳液乳化效率的影响

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图 7 不同浓度改性锂皂石MLap-1对乳液破乳电压的影响

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图 8 改性锂皂石MLap-1抗温性能评价

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表 1 改性锂皂石MLap-1的增黏提切性能评价及与同类产品对比

样品	AV/ mPa·s	PV/ mPa·s	YP/ Pa	Gel/ Pa/Pa
3^#	12	12	0	0.5/0.5
3^#+0.3%MLap-1	23	13	10	3.0/4.5
3^#+0.3%VERSAMOD	16	13	3	0.5/1.0
3^#+0.3%RHEMOD^TML	18	14	4	1.0/1.5

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表 2 MLap-1对油基钻井液性能的影响

T/ ℃	ρ/ g·cm⁻³	PV/ mPa·s	YP/ Pa	LSYP/ Pa	FL_HTHP/ mL	ES/ V
常温	2.0	50	7	5		986
	2.2	65	6	4		919
	2.4	82	6	4		844
180	2.0	49	6	5	3.0	1021
	2.2	63	5	4	3.2	1245
	2.4	81	4	4	3.6	1336
200	2.0	47	5	4	3.4	1074
	2.2	59	5	3	4.0	1308
	2.4	74	4	3	4.8	1389
注：高温老化时间为16 h，高温高压滤失量测量温度为180 ℃

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