一种环保型无泡防水锁剂

褚奇

doi:10.12358/j.issn.1001-5620.2023.04.009

一种环保型无泡防水锁剂

doi: 10.12358/j.issn.1001-5620.2023.04.009

褚奇^1，2,

1.
中石化石油工程技术研究院有限公司, 北京 102206
2.
页岩油气富集机理与有效开发国家重点实验室, 北京 102206

基金项目: 中国石化科技部科研攻关项目“苏北页岩油藏高效钻井与压裂关键技术研究”（P22096）。

详细信息

作者简介:
褚奇，博士，副研究员，1982年生，2012年毕业于西南石油大学应用化学专业，现在从事钻井液技术研究工作。电话（010）56606191；E-mail：chuqi.sripe@sinopec.com。

中图分类号: TE254.4
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出版历程
- 收稿日期: 2023-04-23
- 修回日期: 2023-05-16
- 刊出日期: 2023-07-30

An Environmentally Friendly Non-foaming Anti-water Blocking Agent

CHU Qi^{1，2
,}

1.
SINOPEC Research Institute of Petroleum Engineering Co., Ltd, Beijing 102206
2.
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206

摘要

摘要: 为提高钻井液用防水锁剂的抑泡和环保性能，以海藻酸、羟乙基乙二胺（AEEA）、环氧氯丙烷（ECH）和季戊四醇（PETP）为原料，合成了一种天然改性产物作为防水锁剂SMFS-1。借助傅里叶红外光谱（FT-IR）仪进行了分子结构表征。防水锁性能测试结果显示，加入SMFS-1后水溶液的表面张力能够降低至25 mN/m以内，减小岩心自吸水体积，可促使岩石表面由亲水向中性转变，提高岩心渗透率恢复值至80%以上。SMFS-1抗温可达120 ℃，吸附性能优异，无起泡效应，对钻井液的流变性和滤失性能影响小。环保性能测试结果显示，SMFS-1的半致死浓度（EC₅₀）为32 250 mg/L，生物降解性评价指标（Y）为17.36，达到排放标准，易被生物降解。
- 防水锁剂 /
- 钻井液 /
- 水锁伤害 /
- 无泡 /
- 环保性能
Abstract: In order to improve the bubble inhibition and environmental protection performance of the waterproof locking agent for drilling fluid, a natural modified product SMFS-1 was synthesized from alginic acid, 2-(2-aminoethylamino)ethanol (AEEA), epichlorohydrin (ECH) and pentaerythritol (PETP) as raw materials. The molecular structure was characterized by Fourier infrared spectrometer (FT-IR). The test results of waterproof lock performance show that the surface tension of aqueous solution can be reduced to less than 25 mN/m after the addition of SMFS-1, which can reduce the volume of core self-absorption, promote the change of rock surface from hydrophilic to neutral, and increase the recovery value of core permeability to more than 80%. SMFS-1 is resistant to temperature up to 120 ℃, has excellent adsorption performance, no bubbling effect, and has little impact on rheological properties and filtration properties of drilling fluid. The environmental performance test results showed that the semi-lethal concentration (EC₅₀) of SMFS-1 was 32,250 mg/L, and the biodegradability evaluation index (Y) was 17.36, which met the emission standard and was easy to biodegrade.
- Anti-water blocking agent /
- Drilling fluid /
- Water-lock damage /
- Non-foaming /
- Environmental performance

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图 1 SMFS-1分子结构示意图

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图 2 SMFS-1的FT-IR谱图

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图 3 不同浓度SMFS-1溶液的表面张力变化曲线

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图 4 岩心自吸水体积随浸泡时间的变化曲线

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图 5 防水锁剂的吸附量随温度变化曲线

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图 6 不同防水锁剂的发泡体积

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表 1 不同温度下防水锁剂的表面张力

防水锁剂	表面张力/（mN·m⁻¹）
防水锁剂	25 ℃	50 ℃	75 ℃
SMFS-1	25.00	25.14	26.75
Tween80	25.13	32.63	40.28
OBS	20.04	27.40	33.58
SL	36.79	39.90	43.24
C-201	30.08	35.37	41.08

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表 2 不同温度下防水锁剂的接触角

防水锁剂	接触角/（°）
防水锁剂	25 ℃	50 ℃	75 ℃
蒸馏水	38.97	38.98	38.97
SMFS-1	81.62	81.14	80.00
Tween80	64.21	61.70	57.17
OBS	86.22	77.00	72.47
SL	50.50	47.39	45.20
C-201	72.19	67.26	64.18

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表 3 不同温度下岩心渗透率恢复率

试剂	渗透率恢复率/%
试剂	25 ℃	50 ℃	75 ℃
蒸馏水	31.19	33.70	35.80
SMFS-1	81.25	83.20	85.03
Tween80	60.25	61.38	63.91
OBS	73.28	74.63	75.21
SL	53.44	55.81	56.75
C-201	59.46	60.12	60.31

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表 4 SMFS-1抗温能力测试

T_老化/℃	表面张力/（mN·m⁻¹）	V_自吸水/mL	接触角/（°）	S/%
常温	25.00	0.130	81.62	81.25
80	25.04	0.132	81.27	81.20
100	25.20	0.134	80.84	80.37
120	26.17	0.141	78.90	77.84
140	35.58	0.250	58.47	54.63

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表 5 SMFS-1加入对聚磺钻井液流变与失水性能的影响

SMFS-1/ %	实验条件	AV/ mPa·s	YP/ Pa	Gel/ Pa/Pa	FL_API/ mL	FL_HTHP/ mL
0	常温	22.0	6.5	2.0/7.5
	100 ℃、16 h	21.0	6.0	2.0/7.0	2.8	12.0
	120 ℃、16 h	19.5	5.0	1.5/6.0	3.2	13.2
0.3	常温	22.0	6.5	2.0/7.5
	100 ℃、16 h	21.5	6.0	2.0/7.0	2.6	11.8
	120 ℃、16 h	20.0	5.5	1.5/6.0	3.2	13.2
0.6	常温	22.0	6.5	2.0/7.0
	100 ℃、16 h	21.0	6.0	2.0/7.0	2.6	11.8
	120 ℃、16 h	20.0	5.0	1.5/6.0	3.4	13.4

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表 6 SMFS-1和常规处理剂的生物毒性和生物降解性

试剂	EC₅₀/（mg·L⁻¹）	Y
SMFS-1	32 250	17.36
Tween80	16 500	28.90
OBS	9180	31.96
SL	39 770	17.24
C-201	21 140	19.20

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