可再生生物合成基钻井液体系研究  

Research on Renewable Biosynthetic-Based Drilling Fluid Systems

作　　者：解宇宁[1,2] XIE Yuning(Drilling and Oil Production Technology Research Institute,PetroChina Liaohe Oilfield Company,Panjin,Liaoning,124010,China;Quality Supervising and Testing Center for Well-Entering Fluid of Petroleum Industry,Panjin,Liaoning,124010,China)

机构地区：[1]中国石油辽河油田分公司钻采工艺研究院 [2]石油工业入井流体质量监督检验中心

出　　处：《石油钻探技术》2019年第6期34-39,共6页Petroleum Drilling Techniques

摘　　要：油基钻井液普遍存在基础油难以降解、不可再生等缺点,为此,利用天然生物油脂,通过催化加氢、分子异构等合成了生物合成基础油,以该基础油和改性有机土为主,通过优选其他钻井液添加剂及加量,形成了可再生生物合成基钻井液体系。生物合成基础油是C12—C24的支链异构烷烃混合物,具有优良的安全环保性和黏温特性。室内性能评价试验结果表明,可再生生物合成基钻井液体系的高温高压滤失量低于12 mL,沉降稳定性好,破乳电压在768 V以上,96 h半致死浓度大于1000000 mg/L,能抗20%地层水和10%劣土的侵入,岩屑滚动回收率达到98.06%,经其污染的岩心其渗透率恢复率为83.5%~92.3%。研究结果表明,生物合成基础油具有低毒环保、可降解、可再生等优点,可再生生物合成基钻井液在乳液稳定、抗污染、润滑、抑制、储层保护、安全环保等方面均表现出良好的性能,完全能满足复杂地质条件对钻井液的需求。Oil-based drilling fluids generally have various disadvantages,for example,the base oil is difficult to degrade and non-renewable.Therefore,an investigation on the renewable biosynthesis oil-based drilling fluid system was carried out.The biosynthetic base oils were synthesized by the catalytic hydrogenation and molecular isomerization of natural bio-oils and fats.Based on the biosynthetic base oil and modified organic soil,the renewable biosynthesis-based drilling fluid system was formed through adding other drilling fluid additives and the optimized dosage,and its performance was evaluated.The biosynthetic base oil was a mixture of C12–C24 branched isoparaffins,which had excellent safety,environmental protection and viscosity-temperature properties.The high temperature and high pressure filtration loss of the renewable biosynthesis-based drilling fluid system was lower than 12 mL,the sedimentation stability was good,the demulsification voltage was up to 768 V,and the 96 h semi-lethal concentration was greater than 1000000 mg/L.The biosynthetic oil was able to resist the invasion of 20%formation water and 10%inferior soil,and the rolling recovery rate of cuttings reached 98.06%;the permeability recovery rate of the contaminated cores was up to 83.5%–92.3%.The research results showed that the oil with a biosynthetic base possessed the advantages of low toxicity,environmental protection,degradability and regenerability.The prepared drilling fluid exhibited good properties in emulsion stability,anti-pollution,lubrication,inhibition,reservoir protection,safety and environmental protection,which fully met the needs of drilling fluids under complex geological conditions.

关 键 词：合成基钻井液 生物合成基 可再生 钻井液性能 半致死浓度 防止地层损害 

分 类 号：TE254.3[石油与天然气工程—油气井工程]