摘要
针对页岩气储层采用油基钻井液钻井施工时成本较高,岩屑和废弃钻井液的处理比较复杂,还存在一定的环境污染风险的问题,通过大量室内试验,开发了一种适合页岩气储层的低伤害水基钻井液体系,并综合评价了其耐温性能、抗污染性能、抑制性和储层保护性能。试验结果表明,低伤害水基钻井液体系的耐温性能较好,当老化温度为140℃时,体系仍能保持良好的流变性和降滤失性能;钻井液体系的抗NaCl、CaCl_(2)和岩屑污染性能较好;钻井液体系的抑制性能较强,对页岩岩屑的一次和二次滚动回收率均能达到90%以上,12 h线性膨胀率仅为8.5%;钻井液体系的储层保护性能较好,页岩岩心经过钻井液污染后的渗透率恢复值均能达到80%以上。低伤害水基钻井液能够满足页岩气储层钻井施工对钻井液性能的要求。
When using oil-based drilling fluid for shale gas reservoirs,the cost is relatively high,the treatment of rock cuttings and waste drilling fluid is complex,and there are also certain environmental pollution risks.To solve these problems,a low damage water-based drilling fluid system suitable for shale gas reservoirs has been developed through a large number of indoor experiments,and its temperature resistance,pollution resistance,inhibition,and reservoir protection performance have been comprehensively evaluated.The experimental results show that the low damage water-based drilling fluid system has good temperature resistance.When the aging temperature is 140℃,the system can still maintain good rheological properties and fluid loss reduction performance.The drilling fluid system has good resistance to sodium chloride,calcium chloride and rock cuttings contamination.The drilling fluid system has a strong inhibitory performance,with a primary and secondary rolling recovery rate of over 90%for shale cuttings,and a linear expansion rate of only 8.5%after 12 h.The drilling fluid system has good reservoir protection performance and the permeability recovery value of shale core after being contaminated by drilling fluid can reach over 80%.The low damage water-based drilling fluid can meet the requirements for drilling fluid performance in shale gas reservoir drilling.
作者
贺弈铭
HE Yiming(Nanniwan Oil Production Plant of Yanchang Oilfield Co.,Ltd.,Yan’an 716000,Shaanxi,China)
出处
《能源化工》
CAS
2024年第1期53-56,共4页
Energy Chemical Industry
关键词
页岩气储层
水平井
水基钻井液
低伤害
性能评价
shale gas reservoir
horizontal well
water-based drilling fluid
low damage
performance evaluation
