适合海上某气田高温高压低渗储层的修井液体系

梁玉凯; 罗刚; 周玉霞; 宋吉锋; 郑华安; 任坤峰; 林科雄

doi:10.12358/j.issn.1001-5620.2022.05.018

适合海上某气田高温高压低渗储层的修井液体系

doi: 10.12358/j.issn.1001-5620.2022.05.018

1.
中海石油(中国)有限公司海南分公司, 海口 570311
2.
湖北油田化学产业技术研究院有限公司, 湖北荆州 434000

基金项目: 中海石油（中国）有限公司南海西部高温高压气藏勘探开发技术及勘探新领域研究（CNOOC-KJ 135 ZDXM 38 ZJ 02 ZJ）

详细信息

作者简介:
梁玉凯，1981年生, 毕业于中国石油大学（华东）油气田开发专业，现在从事采油工艺技术研究与应用工作

通讯作者:
罗刚，工程师，1977年生，现在主要从事油气井井筒工作液技术研究工作。E-mail： luogang8658@163.com

中图分类号: TE358
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- 被引次数: 0
出版历程
- 收稿日期: 2022-04-06
- 修回日期: 2022-04-27
- 录用日期: 2022-05-12
- 刊出日期: 2023-01-10

Study on Workover Fluid Suitable for High Temperature, High Pressure and Low Permeability Reservoirs in Offshore Gas Field

1.
CNOOC China Limited, Hainan Branch, Haikou, Hainan 570311
2.
Huhei Oilfield Chemical Industry Technology Research Institute, Jingzhou, Hubei 434000

摘要

摘要: 针对海上某高温高压低渗气田修井作业过程中修井液易对储层造成污染伤害以及对井下管柱易产生严重腐蚀等问题，室内以可溶性复合盐加重材料HGBZ为基础，并结合抗高温缓蚀剂HSJ-S、耐温抗盐防水剂HAD-2以及抗高温键合剂HJH-2等主要处理剂，研制了一套适合海上高温高压低渗气田的双保型高温高密度修井液体系，并对其综合性能进行了评价。结果表明：该修井液体系的基本性能良好，密度在1.03～1.80 g/cm³之间可调；修井液具有较好的防腐蚀效果，对井下设备钢材的腐蚀速率低于0.076 mm/a；修井液对目标气田储层段黏土矿物的防膨效果较好，防膨率可以达到95%以上；修井液与储层段地层水具有较好的配伍性，不会产生结晶沉淀等；修井液体系可以有效降低天然岩心的自吸水量，并且经过修井液污染后的天然岩心在长时间高温条件下的渗透率恢复值可以达到90%以上，具有良好的储层保护效果。X井使用双保型高温高密度修井液体系修井过程顺利，未发生井下复杂事故，修井后产能恢复率较高，说明研究的双保型高温高密度修井液体系能够满足海上高温高压低渗气田的修井作业要求。
- 海上气田 /
- 低渗储层 /
- 高温高压 /
- 修井液 /
- 储层保护
Abstract: In view of the problems that workover fluid is easy to cause pollution damage to reservoir and serious corrosion to downhole pipe string during workover operation in a high-temperature, high-pressure and low-permeability gas field on the sea, the laboratory is based on soluble composite salt weighting material HGBZ, combined with high-temperature corrosion inhibitor HSJ-S, temperature and salt resistant waterproof agent HAD-2 and high-temperature bonding agent HJH-2, A set of dual maintenance high temperature and high density workover fluid system suitable for offshore high temperature, high pressure and low permeability gas fields is developed, and its comprehensive performance is evaluated. The results show that the basic performance of the workover fluid system is good, and the density is adjustable between 1.03-1.80 g/cm³; Workover fluid has good anti-corrosion effect, and the corrosion rate of downhole equipment steel is less than 0.076 mm/a; The workover fluid has a good anti swelling effect on clay minerals in the reservoir section of the target gas field, and the anti-swelling rate can reach more than 95%; Workover fluid has good compatibility with formation water in reservoir section and will not produce crystallization precipitation, etc; Workover fluid system can effectively reduce the self-absorption water of natural core, and the permeability recovery value of natural core polluted by workover fluid can reach more than 90% under high temperature for a long time, which has good reservoir protection effect. Well X uses the dual protection high temperature and high density workover fluid system, the workover process is smooth, there is no downhole complex accident, and the productivity recovery rate is high after workover, indicating that the dual protection high temperature and high density workover fluid system studied can meet the workover requirements of offshore high temperature, high pressure and low permeability gas fields.
- Offshore gas field /
- Low permeability reservoir /
- High temperature and high pressure /
- Workover fluid /
- Reservoir protection

HTML全文

图 1 不同类型防水锁剂性能评价结果

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图 2 键合剂HJH-2加量对CST值的影响

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图 3 修井液体系的腐蚀性能

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图 4 修井液体系的防膨性能

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图 5 岩心自吸水实验结果

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表 1 抗高温缓蚀剂HSJ-S加量优选

钢片编号	HSJ-S/ %	m₁/ g	m₂/ g	∆m/ g	腐蚀速率/ mm·a⁻¹
8014	0	7.9751	7.1452	0.8299	4.256
8015	0.5	7.6182	7.4531	0.1651	0.847
8016	1.0	7.6053	7.5961	0.0092	0.047
8017	1.5	7.5868	7.5802	0.0066	0.035
8018	2.0	7.5907	7.5884	0.0023	0.012

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表 2 修井液体系与地层水的配伍性

测定条件	修井液与地层水不同比例混合后的浊度值/NTU
测定条件	9∶1	7∶3	5∶5	3∶7	1∶9
加热前	2.7	2.4	2.5	1.9	1.7
加热后	3.8	4.6	3.5	2.7	3.1

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表 3 修井液体系储层保护性能评价结果

岩心号	K₀/mD	K_d/mD	(K₀/K_d)/%
256	1.03	0.86	83.49
248	0.98	0.84	85.71
367	2.99	2.76	92.31

下载: 导出CSV

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