适用于LAS系统的全液体隔离液体系

王雪山; 邹亦玮; 张福铭; 田野

doi:10.12358/j.issn.1001-5620.2024.04.010

适用于LAS系统的全液体隔离液体系

doi: 10.12358/j.issn.1001-5620.2024.04.010

中海油田服务股份有限公司油田化学研究院, 河北燕郊065201

基金项目: 中海油田服务股份有限公司科技项目“海水基固井关键外加剂的开发与机理研究”（YHB23YF004）。

详细信息

作者简介:
王雪山，高级工程师，毕业于西北工业大学高分子材料专业，现在主要从事固井水泥浆、前置液等方面的研究工作。电话　13931674909；E-mail：wangxsh7@cosl.com.cn

中图分类号: TE256.6
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出版历程
- 收稿日期: 2024-04-09
- 修回日期: 2024-05-21
- 刊出日期: 2024-09-30

An All-Liquid Spacer for LAS System

Oilfield Chemicals R & D Institute, COSL, Yanjiao, Hebei 065201

摘要

摘要: 固井施工过程中，在注入水泥浆前，需要先泵入一定量的隔离液，在海洋固井现场施工作业过程中，隔离液配制一般需要繁重的人工劳作，劳动强度大，作业效率低，加量不准确。为解决上述问题，用液体添加剂代替固体添加剂，通过LAS材料添加系统将材料混配作业，从传统的重体力劳动转化为智能化操作，降低作业强度，提高固井作业效率与降低人员成本。通过反相乳液聚合制备了一种液体隔离剂C-S70L，以它为主剂，构建了一套适用于液体加料系统(LAS)的隔离液体系。该体系推荐使用温度为20～120 ℃，适用密度为1.30～1.70 g/cm³；具有良好的悬浮稳定性（热滚后无沉降）、流变可调、失水可控以及相容性好的特点。
- 固井 /
- 相容性 /
- 沉降稳定性 /
- 隔离液 /
- LAS系统 /
- 反向乳液聚合
Abstract: In well cementing operation, a certain amount of spacer needs to be pumped into the wellbore before injecting cement slurries. In offshore well cementing, the preparation of spacer requires heavy manual labor, and the labor intensity is quite high, resulting in low operation efficiency and poor control on the quantities of the spacer additives. To solve this problem, liquid additives are used to replace the solids additives in formulating the spacer, and the liquid additives are added through the additive addition system LAS. Using this technique, the traditional heavy physical labor in formulating a spacer is replaced with intelligent operation, the labor intensity is lowered, the efficiency of well cementing operation is increased, and the labor costs are reduced. A liquid spacer additive C-S70L is prepared through inverse emulsion polymerization. Using C-S70L as the core additive, a spacer suitable for injection using the LAS is formulated. This spacer can be used in temperature range of 20 - 120 °C and density range of 1.30 – 1.70 g/cm3. It has good suspending stability (no settling after hot rolling), a rheology that is easy to adjust, a fluid loss that is controllable and good compatibility.
- Well cementing /
- Compatibility /
- Settling stability /
- Spacer /
- LAS /
- Inverse emulsion polymerization

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图 1 经过改造的高温高压稠化仪浆叶

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图 2 液体隔离剂C-S70L的红外光谱

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图 3 隔离液在稠化仪中120 ℃沉降稳定性

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图 4 纯水泥浆在120 ℃下的稠化曲线

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图 5 25/75隔离液水泥浆在120 ℃下的稠化曲线

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图 6 不同密度隔离液的冲洗效果

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图 7 双效隔离液润湿反转能力

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表 1 液体隔离剂C-S70L的分子量和分子量分布

样品名称	数均分子量Mn(kDa)	不确定度	重均分子量M_W(kDa)	不确定度	分子量分布 (Mw/Mn)
C-S70L	515.5	1.3%	1474.2	1.3%	2.86

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表 2 C-S70L不同加量下1.3 g/cm³隔离液的流变性能

C-S70L/ %	T/ ℃	流变读数
C-S70L/ %	T/ ℃	φ₃	φ₆	φ₁₀₀	φ₂₀₀	φ₃₀₀	φ₆₀₀
1.50	25	6	9	48	71	89	132
1.75	25	7	10	55	81	101	147
2.00	25	10	13	65	95	118	164
2.25	25	11	17	79	113	139	192
2.50	25	13	17	80	115	142	196

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表 3 不同密度隔离液在不同温度下流变性能

ρ/ g·cm⁻³	T/ ℃	流变读数
ρ/ g·cm⁻³	T/ ℃	φ₃	φ₆	φ₁₀₀	φ₂₀₀	φ₃₀₀	φ₆₀₀
1.30	25	10	13	65	95	118	164
	90	6	8	35	50	62	88
	120	3	4	20	31	40	59
1.50	25	11	15	73	106	135	192
	90	7	9	43	63	77	110
	120	5	7	35	51	68	99
1.70	25	13	19	93	135	167	238
	90	10	14	79	125	154	201
	120	7	11	54	81	100	143

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表 4 不同密度隔离液120 ℃下的沉降稳定性

ρ_隔离液/g·cm⁻³	ρ_上/g·cm⁻³	ρ_下/g·cm⁻³	沉降因子SF
1.30	1.30	1.30	0.5
1.50	1.49	1.51	0.503
1.70	1.68	1.72	0.506

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表 5 隔离液与钻井液、水泥浆的流变相容性

水基钻井液/%	隔离液/ %	水泥浆/ %	流变读数						R值
水基钻井液/%	隔离液/ %	水泥浆/ %	φ₃	φ₆	φ₁₀₀	φ₂₀₀	φ₃₀₀	φ₆₀₀	R值
100	0		7	8	25	38	58	82
95	5		7	8	27	43	62	85	−52
75	25		8	10	34	56	75	98	−44
50	50		7	9	56	78	94	130	−23
25	75		8	10	68	110	138	160	−11
5	95		10	13	75	122	150	191	−4
0	100		10	14	79	125	154	201
	0	100	8	14	125	217	270	>300
	5	95	9	14	118	200	268	>300	−7
	25	75	9	14	108	170	221	>300	−17
	50	50	9	13	97	154	189	278	−28
	75	25	9	14	89	124	157	235	−36
	95	5	10	13	80	100	125	186	−45
	100	0	10	14	79	125	154	201

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表 6 隔离液体系对水泥浆抗压强度的影响

水泥浆/ %	隔离液/ %	抗压强度/ MPa
100	0	28.6
95	5	24.5
75	25	8.9

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