滑溜水在页岩储集层的吸附伤害及控制措施

郭建春; 李杨; 王世彬

doi:10.11698/PED.2018.02.15

石油勘探与开发 >

2018 , Vol. 45 >Issue 2: 320 - 325

DOI: https://doi.org/10.11698/PED.2018.02.15

石油工程

滑溜水在页岩储集层的吸附伤害及控制措施

郭建春 ,
李杨 ,
王世彬

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油气藏地质及开发工程国家重点实验室西南石油大学,成都 610500

郭建春（1970-）,男,四川南充人,博士,西南石油大学石油与天然气工程学院教授,主要从事油气开采与储集层改造理论与技术、非常规天然气开发等方面的教学与研究工作。地址：四川省成都市新都区新都大道8号,西南石油大学油气藏地质及开发工程国家重点实验室A411室,邮政编码：610500。E-mail：guojianchun@vip.163.com

收稿日期: 2017-10-14

修回日期: 2018-01-10

网络出版日期: 2018-03-22

基金资助

国家杰出青年科学基金项目（51525404）; “十三五”国家科技重大专项（2016ZX05021,2016ZX05023）; 四川省杰出青年学术技术带头人资助计划（2016JQ0015）

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Adsorption damage and control measures of slick-water fracturing fluid in shale reservoirs

GUO Jianchun ,
LI Yang ,
WANG Shibin

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State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation in Southwest Petroleum University, Chengdu 610500, China

Received date: 2017-10-14

Revised date: 2018-01-10

Online published: 2018-03-22

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摘要

基于四川盆地长宁区块奥陶系五峰组—志留系龙马溪组页岩充填模型,研究滑溜水中聚合物在页岩中的吸附伤害及控制措施。利用驱替实验并结合紫外分光测试,得到了滑溜水中的聚合物在不同时间、浓度、pH值和温度下的吸附规律：吸附平衡时间为150 min;聚合物浓度越高吸附量越大,极限吸附浓度为1 800 mg/L;随pH值增大吸附量呈逐级递减趋势;吸附量随温度先增后减,45 ℃时吸附量最大。通过电镜扫描、核磁共振成像描述了聚合物在页岩上的吸附形态,证明聚合物吸附会导致阴离子聚丙烯酰胺分子网络结构破坏,且对页岩的吸附构象进行了形貌表征。根据页岩与聚合物间的吸附规律和吸附机理,认为用氢键破坏剂可以降低聚合物在页岩表面的吸附量。对4类电负性较强的小分子物质进行氢键破坏效果对比,氢键破坏剂c效果最佳,可使吸附量降低5.49 mg/g,渗透率恢复至73.2%。研究成果可为优化施工参数和改进滑溜水液体体系提供借鉴。图7表2参35

关键词： 页岩; 水力压裂; 滑溜水; 聚合物; 页岩吸附; 解吸附

本文引用格式

郭建春 , 李杨 , 王世彬 . 滑溜水在页岩储集层的吸附伤害及控制措施[J]. 石油勘探与开发, 2018 , 45(2) : 320 -325 . DOI: 10.11698/PED.2018.02.15

Abstract

The slick-water polymer adsorption damage and control measures in shale were examined using a shale pack model of the Ordovician Wufeng Formation-Silurian Longmaxi Formation in the Changning block of the Sichuan Basin. The adsorption law of slick water under different displacement time, concentrations, pH values and temperatures of polymer were tested by traditional displacement experiment and UV-Vis spectrophotometer. The adsorption equilibrium time was 150 min, the amount of adsorption was proportional to the concentration of the polymer, and the maximum adsorption concentration was 1 800 mg/L. With the increase of pH value, the adsorption capacity decreased gradually, the adsorption capacity increased first and then decreased with the increase of temperature, and the adsorption capacity was the largest at 45 ℃. The adsorption patterns of polymers on shale were described by scanning electron microscopy and magnetic resonance imaging. It is proved that the adsorption of polymer on shale led to the destruction of the network structure of anionic polyacrylamide molecules, and the shale adsorption conformation was characterized qualitatively. Finally, according to the adsorption law and adsorption mechanism, it is proposed to reduce the adsorption quantity of polymer on shale surface by using hydrogen bond destruction agent. The effects of hydrogen bond destruction on four kinds of strong electronegative small molecules were compared, the hydrogen bond destroyer c was the best, which lowered the adsorption capacity by 5.49 mg/g and recovered permeability to 73.2%. The research results provide a reference for the optimization of construction parameters and the improvement of slickwater liquid system.

Key words： shale; hydraulic fracturing; slick-water; polymer; shale adsorption; desorption

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