天然气工业2023，Vol.43Issue(12)：91-99,9.DOI:10.3787/j.issn.1000-0976.2023.12.010
基于压力响应释放的水基钻井液用靶向微胶囊润滑剂
Targeted pressure-response encapsulated lubricants for water-based drilling fluids
摘要
Abstract
The conventional lubricants for water-based drilling fluids have the disadvantages of low effective concentration,short continuous lubrication and great consumption.Based on the new idea of developing a lubricant by combining microcapsule structure and targeted release,this paper develops a targeted pressure-response encapsulated lubricant(T-LUBE)with modified urea-formaldehyde resin as the wall material and oil lubricant as the core material by means of in-situ polymerization.In addition,the microcapsule characteristics and continuous lubrication of T-LUBE are characterized and the key mechanisms of T-LUBE are investigated by means of infrared spectroscopy,scanning electron microscopy,atomic force microscopy,extreme pressure lubrication,and four-ball dynamic friction and wear experiments.And the following research results are obtained.First,T-LUBE is a kind of microcapsule with a"core-shell"structure,which can resist the temperature up to 150 ℃ and exhibits excellent drilling fluid compatibility.When 3wt％ T-LUBE is used,the extreme pressure lubrication coefficient can be reduced by above 80％.Second,T-LUBE has the characteristics of pressure-response release and targeted lubrication with the critical point of microcapsule releasing friction pressure of about 28.3 Nem.When encountering high friction and large torque in the downhole conditions,the microcapsule releases lubricant continuously under the pressure,enabling the targeted lubrication of downhole key parts and ensuring higher lubricant concentration.Thus,continuous lubrication is exerted fully.Third,T-LUBE has been tested on site in 3 wells of the Sinopec Shengli Oilfield,and the results are good.The friction in the test section decreases by more than 30％ and the total consumption of drilling fluid lubricant reduces by more than 40％.In conclusion,this newly developed lubricant can provide technical support for the efficient drilling of complex structure wells such as extended reach wells and long horizontal wells,and is of great theoretical and practical significance to safe,quality and efficient oil and gas well drilling.关键词
水基钻井液/润滑剂/微胶囊/压力敏感/靶向润滑/现场试验Key words
Water-based drilling fluid/Lubricant/Microcapsule/Pressure-response/Targeted lubrication/Field test引用本文复制引用
刘均一,宋华,陈二丁,夏晔..基于压力响应释放的水基钻井液用靶向微胶囊润滑剂[J].天然气工业,2023,43(12):91-99,9.基金项目
中国石化石油工程公司科技课题项目"囊装钻井液润滑剂的研究与应用"(编号:SG19-73K). （编号:SG19-73K）
