一种W/O乳化液在海上高温砂岩储层分流酸化中的评价与应用

吴广; 荣新明; 周泓宇; 白冰; 张博; 王春林

doi:10.3969/j.issn.1001-5620.2018.05.021

一种W/O乳化液在海上高温砂岩储层分流酸化中的评价与应用

doi: 10.3969/j.issn.1001-5620.2018.05.021

1. 中海油田服务股份有限公司, 天津 300459;
2. 中海石油(中国)有限公司湛江分公司, 广东湛江 524057;
3. 中海石油(中国)有限公司天津分公司, 天津 300459

详细信息

作者简介:
吴广,1985年生,现在主要从事油气田储层改造方面工作。电话(022)59552378;E-mail:wuguang2@cosl.com.cn。

中图分类号: TE357.2
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出版历程
- 收稿日期: 2018-05-05
- 刊出日期: 2018-09-30

Application of An Invert Emulsion in Diverted Acidizing of High Temperature Offshore Sandstone Reservoirs

1. China Offshore Service Limited Co., Tianjin 300459;
2. CNOOC(China) Co., Ltd. Zhanjiang Branch, Zhanjiang, Guangdong 524057;
3. CCNOOC(China) Co., Ltd. Tianjin Branch, Tianjin 300459

摘要

摘要: 针对目前酸化常用分流剂无法简便有效地应用于海上高温砂岩储层油田酸化作业的现状，研制了一种由活性柴油与地层采出水配制的W/O乳化液分流体系。实验优选出的活性柴油与地层采出水比例为3∶7的乳化液在130℃和170 s-1剪切速率下仍然具有40 mPafs的黏度，单管岩心封堵实验表明，其对模拟水层与油层岩心的封堵率分别为大于80%和小于21.6%，并联双管岩心封堵分流实验表明其对低渗油层的分流率均能达到80%以上，分流酸化物理模拟实验表明，乳状液分流酸化后低渗油层岩心的渗透率增大170%左右，高渗水层岩心的渗透降低60%左右。该技术在南海西部油田矿场应用中取得了日增油103.3 m³/d、含水率降低18.8%的显著增油降水效果，具有较大推广价值。
- 高温储层 /
- 砂岩酸化 /
- 分流工艺 /
- W/O乳化液 /
- 海上油田
Abstract: Diversion agents commonly used in present acidizing operations are unable to be easily and effectively used in acidizing high temperature offshore sandstone reservoirs. An invert emulsion diverting system has been developed with an active diesel oil and formation water to overcome this defciency. The volumetric ratio of the active diesel oil and formation water is 3:7 in the emulsion which has viscosity of 40 mPa·s even shearing at 170 s^-1 under 130℃. Single barrel core test results showed that the permeability of simulated cores of water zones was reduced by more than 80%, and the permeability of simulated cores of oil zones reduced by less than 21.6%. Parallel dual-barrel core test results showed that the rate of diversion of the emulsion to low permeability pay zones was greater than 80%. Diverted acidizing physical simulation experimental results showed that after diverted acidizing with the emulsion, the permeability of low permeability pay zones was increased by about 170%, and the permeability of high permeability water zones reduced by about 60%. This technology has been applied in Nanhai West Oilfeld, the oil production rate was increased by 103.3 m³/d, and the water cut was reduced by 18.8%, indicating that the technology is worth spreading.
- High temperature reservoir /
- Sandstone acidizing /
- Diversion stimulation technique /
- Invert emulsion /
- Offshore oilfeld

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