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荷电分子膜固砂机理及油藏适应性评价
段伟刚,邵现振,李文轩
0
(中国石化胜利油田分公司河口采油厂,山东东营257200)
摘要:
针对河口油区疏松砂岩油藏机械防砂效益低、常规固砂剂对储层伤害大的问题,开展荷电分子膜固砂体系研究。筛选出荷电聚合物2012A001作为荷电分子膜固砂体系的主剂,重点分析固砂体系受pH值调控的反应机理,同时考察不同油藏条件对固砂效果的影响。结果表明:荷电分子膜固砂体系的耐冲刷流量达6 000 mL/h;温度超过40 ℃,矿化度为10 000 mg/L以下,随着温度升高和矿化度增高,体系的固化速度增快;黏土含量越高,渗透率保留率越低,当黏土含量超过5%时需加入黏土稳定剂;砂粒表面含油会影响固砂体系吸附,现场注入前需进行充分的洗油处理;砂粒粒径越小、聚合物质量分数越高,防砂效果越好,但对渗透率伤害也越大,现场需根据区块砂粒粒径选用合理质量分数的荷电分子膜固砂体系。根据河口油区疏松砂岩油藏的储层特征,分别配制了不同配方的荷电分子膜固砂体系。自2018年至今,现场推广应用15井次,累积增产原油达4 500 t,投入产出比达到1∶6。
关键词:  荷电分子膜  固砂体系  化学防砂  固化  聚合物  储层伤害
DOI:10.13673/j.cnki.cn37-1359/te.2020.04.017
基金项目:中国石化胜利油田分公司攻关课题“荷电分子膜固砂技术研究”(YC1708)。
Mechanism and reservoir adaptability of charged molecular membrane system for sand consolidation
DUAN Weigang,SHAO Xianzhen,LI Wenxuan
(Hekou Oil Production Plant,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257200,China)
Abstract:
The study of charged molecular membrane system for sand consolidation was carried out to solve the problems oflow benefit of mechanical sand control and serious damage to reservoir caused by conventional sand consolidation agents in unconsolidated sandstone reservoir in Hekou oil province. The charged polymer 2012A001 was selected as the main agent of the charged molecular membrane system for sand consolidation. The reaction mechanism of sand consolidation system controlled by pH value was emphatically analyzed. The effects of different reservoir conditions on sand consolidation were investigated. The results show that the erosion resistance flow rate of the charged molecular membrane system for sand consolidation is up to 6 000 mL/h. When the temperature exceeds 40 ℃ and the salt content in water is below 10 000 mg/L,the curing speed of the charged molecular membrane system increases with the increase of temperature and salt content. The higher the clay content is,the lower the permeability retention of the core will be. The clay stabilizer should be added when the clay content exceeds 5%. The oil on the surface of sand particles will affect the adsorption of the charged molecular membrane system,so it is necessary to wash the oil thoroughly before injection. The sand control performance is improved with the decrease of sand particle size and the increase of polymer mass fraction but the permeability damage would be more serious. Therefore,the reasonable mass fraction of the charged molecular membrane system for sand consolidation should be selected according to the sand particle size of the reservoir in specific block. According to the characteristics of unconsolidated sandstone reservoir in Hekou oil province,the charged molecular membrane systems for sand consolidation with different formulations were developed. Since 2018,this system has been applied in 15 wells in Hekou oil province,with a cumulative increased oil production of 4 500 tons oil and an input-output ratio of 1∶6.
Key words:  charged molecular membrane  sand consolidation system  chemical sand control  curing  polymer  reservoir Damage

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