摘要
开发一种适用于页岩储层的水基钻井液体系,以优化钻井过程中的页岩稳定性和防水锁效果。通过页岩滚动回收率、线性膨胀率测试以评价不同处理剂的效果。结果表明:0.5%WEDM+1.5%SFTH复配体系可显著提高页岩的回收率,同时最大线性膨胀率由37.6%降至16.80%。封堵剂CMS在控制滤失量方面表现出色,包被剂KPAM在提高钻井液稳定性和降低滤失量方面具有显著效果。防水锁水基钻井液配方为:4%基浆+1.0%WEDM+1.5%SFTH+1.5%CMS+0.3%KPAM+2.0%op-10。该体系在高温高压条件下展现出了优异的流变特性和滤失控制能力,特别是在抗温性和抗污染性方面表现卓越。该体系在150℃高温下保持了良好的稳定性,且对NaCl和CaCl_(2)的抗污染能力强。在储层保护方面,该体系能有效减少钻井液对储层的伤害,实现高达85.69%的渗透率恢复率,同时形成的泥饼质量良好。研究成果对于页岩气开采具有重要意义。
A water-based drilling fluid system suitable for shale reservoirs was developed to optimize shale stability and waterprooflocking effect during drilling.The linear expansion rate test of shale rolling recovery rate was used to evaluate the effect of different treatment agents.Experimental results showed that the 0.5%WEDM+1.5%SFTH compound system could significantly improve the recovery rate of shale,while the maximum linear expansion rate was reduced from 37.6%to 16.80%.The plugging agent CMS had excellent performance in controlling fluid loss,and the coating agent KPAM had a significant effect in improving the stability of drilling fluid and reducing fluid loss.The waterproof and water-locking base drilling fluid formula was as follows:4%base slurry+1.0%WEDM+1.5%SFTH+1.5%CMS+0.3%KPAM+2.0%op-10.The system exhibited excellent rheological properties and filter loss control capabilities under high temperature and high pressure conditions,especially in terms of temperature resistance and pollution resistance.This system maintained good stability at a high temperature of 150℃ and had strong anti-pollution ability against NaCl and CaCl_(2).In terms of reservoir protection,this system could effectively reduce the damage caused by drlling fluid to the reservoir,to achieve a permeability recovery rate of up to 85.69%and form a mud cake of good quality.The research results of this article are of great significance for shale gas exploitation.
作者
贾东林
闫海建
黄小峰
夏海英
樊建建
JIA Donglin;YAN Haijian;HUANG Xiaofeng;XIA Haiying;FAN Jianjian(Yanchang Oilfield Co.,Ltd.Zhichang Oil Production Plant,Yan'an Shanxi 717300,China;Xian Shiyou University,Xian Shaanxi 710065,China)
出处
《当代化工》
CAS
2024年第3期631-635,共5页
Contemporary Chemical Industry
基金
国家自然科学基金项目,苯基多环芳烃检测及其石油地球化学意义(项目编号:41972148)。
关键词
页岩
防水锁剂
储层保护
性能评价
Shale
Waterproof locking agent
Reservoir protection
Performance evaluation
