耐高温高盐钻井液润滑剂的研制与性能评价

王宗轮; 孙金声; 刘敬平; 吕开河; 邵子桦; 张宪法

doi:10.12358/j.issn.1001-5620.2022.05.002

耐高温高盐钻井液润滑剂的研制与性能评价

doi: 10.12358/j.issn.1001-5620.2022.05.002

王宗轮^1,,
孙金声^{1, 2},
刘敬平^1, ,,
吕开河¹,
邵子桦¹,
张宪法¹

1.
中国石油大学(华东)石油工程学院, 山东青岛 266580
2.
中国石油集团工程技术研究院有限公司，北京 102206

基金项目: 国家自然科学基金面上项目“页岩气裂缝性地层剪切滑移坍塌机理与水基钻井液稳定方法”(52074330)

详细信息

作者简介:
王宗轮，在读博士研究生，1997年生，主要从事复杂地层钻井液技术的研究工作。E-mail：17854262654@163.com

通讯作者:
刘敬平，副教授，1985年生，从事油气井化学工程理论与技术方面的研究工作。E-mail：20160038@upc.edu.cn

中图分类号: TE254.1
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出版历程
- 收稿日期: 2022-05-16
- 修回日期: 2022-06-28
- 刊出日期: 2023-01-10

Development and Performance Evaluation of High Temperature Salt Resistant Drilling Lubricant

1.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580
2.
CNPC Engineering Technology R & D Company Limited, Beijing 102206

摘要

摘要: 针对深井超深井钻井过程中高扭矩和高摩阻等难题，利用硼酸、多元醇和长链脂肪酸等原料，合成出一种耐高温高盐钻井液润滑剂SOB，该润滑剂在高温高盐条件下具有良好的润滑性能。在5%基浆中加入1%润滑剂SOB后，润滑系数降低率为92.7%，泥饼的黏附系数降低至0.0405，极压润滑持效性强；210 ℃下润滑系数降低率保持在90.2%，210 ℃、35%NaCl条件下润滑系数降低率保持在81.3%。高温高盐条件下SOB在高密度钻井液中配伍性良好，200 ℃老化后对钻井液的流变性无影响，能够降低钻井液滤失量，润滑系数降低率为45.09%，相比常规润滑剂性能优越，这是由于润滑剂能够在钻具表面有效吸附，形成一层疏水性较强的膜，使钻具与井壁的直接接触变成了润滑膜之间的接触，从而降低摩擦。
- 水基钻井液 /
- 润滑剂 /
- 硼酸酯 /
- 耐高温 /
- 耐盐
Abstract: Using boric acid, polyols and long-chain fatty acids, a high temperature salt resistant drilling lubricant SOB has been developed to deal with high torque high friction encountered in deep and ultra-deep well drilling. SOB has good lubricity at high temperatures and high salinities. A 5% base mud treated with 1% SOB has its friction coefficient reduced by 92.7%, and the adhesion coefficient of the mud cake produced by that mud is reduced to 0.0405, meaning that SOB has a sustainable lubricity under extreme pressure condition. Percent reduction of friction coefficient at 210 ℃ is generally 90.2%, percent reduction of friction coefficient of a mud containing 35%NaCl at 210 ℃ is generally 81.3%. At high temperature and high salinity conditions, SOB has good compatibility with other components of a high density drilling fluid. After aging at 200 ℃, the rheology of the drilling fluid was not affected, the mud filtration rate can be reduced, and the coefficient of friction of the mud was reduced by 45.09%, meaning that SOB has better lubricity than conventional drilling lubricants. The reason for this phenomenon is that SOB can be effectively adsorbed on the surfaces of the drill strings, forming a layer of film with strong hydrophobicity. The existence of this film changes the direct contact between the drill strings and the borehole wall to a contact between two films of the lubricant, thereby effectively reducing the friction therebetween.
- Water based drilling fluid /
- Lubricant /
- Borate /
- High temperature resistant /
- Salt resistant

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图 1 不同润滑剂对基浆润滑系数的影响

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图 2 SOB浓度对基浆润滑系数的影响

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图 3 不同润滑剂对5%基浆泥饼黏附系数的影响

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图 4 温度对润滑剂SOB润滑性能的影响

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图 5 210 ℃老化后不同润滑剂的润滑性能

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图 6 不同NaCl浓度下润滑剂SOB的润滑系数

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图 7 不同NaCl浓度下润滑剂SOB的润滑系数降低率

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图 8 30%NaCl下不同润滑剂的润滑系数降低率

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图 9 润滑剂吸附量随吸附时间的变化曲线

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图 10 吸附量随润滑剂浓度的变化

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图 11 钢片在润滑剂溶液中浸泡前后的接触角

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表 1 SOB对基浆极压摩擦不同时间的润滑系数的影响

SOB/ %	不同时间（min）的润滑系数K_f					滑块发热情况
SOB/ %	5	10	20	25	30	滑块发热情况
0	0.631	0.645	0.655	0.664	0.672	发热
1	0.046	0.045	0.043	0.042	0.043	不发热

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表 2 润滑剂SOB对基浆性能的影响

SOB/ %	T_老化/ ℃	AV/ mPa·s	PV/ mPa·s	YP/ Pa	FL_API / mL
0	室温	7.0	6.0	1.0	23.2
1	室温	8.5	6.0	2.5	18.4
0	150	7.5	5.5	2.0	29.6
1	150	8.5	7.0	1.5	24.8
0	180	5.0	4.5	0.5	32.4
1	180	6.0	5.0	1.0	28.2
0	210	4.0	4.0	0	36.0
1	210	4.5	4.0	0.5	34.4

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表 3 高温高盐条件下润滑剂对高密度钻井液性能的影响

润滑剂	实验条件	AV/ mPa·s	PV/ mPa·s	YP/ Pa	FL_API / mL	K_f	ΔK_f/ %
0	老化前	84.5	65	19.5	1.6	0.172
0	200 ℃、16 h	65.0	50	15.0	2.8	0.151
1%SOB	老化前	85.5	68	17.5	1.2	0.095	44.77
1%SOB	200 ℃、16 h	67.5	51	16.5	2.4	0.083	45.09
1%RH-3	老化前	83.0	66	17.0	1.4	0.130	24.42
1%RH-3	200 ℃、16 h	64.0	51	13.0	2.4	0.112	25.83
1% 油酸甲酯	老化前	82.5	64	18.5	1.2	0.142	17.44
1% 油酸甲酯	200 ℃、16 h	63.5	49	14.5	2.6	0.123	18.54
1%HEP-1	老化前	85.0	67	18.0	1.4	0.110	12.21
1%HEP-1	200 ℃、16 h	66.5	49	17.5	2.4	0.128	15.23

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