钻井液与完井液2026，Vol.43Issue(3)：324-330,7.DOI:10.12358/j.issn.1001-5620.2026.03.004
适用于深层煤岩气水平井的新型井壁稳定剂
A New Borehole Wall Stabilizer for Deep Horizontal Drilling of CBM
摘要
Abstract
A borehole wall stabilizer WDJ-1 was developed to address the problem of borehole wall instability and sloughing caused by property differences at the interface of coal-rock and coal-gangue in horizontal wells for deep coalbed methane(CBM).WDJ-1 was synthesized via aqueous solution polymerization using polyvinyl alcohol(PVA)and tannic acid(TA)as functional monomers,and borax and ferric chloride(FeCl3)as dual crosslinking agents.The synthesis was optimized with a monomer ratio of PVA∶TA=1∶1,a reaction temperature of 85℃,a reaction time of 3 h,a system pH of 7.5,and the concentrations of the crosslinking agents(0.1%borax and 0.25%FeCl3).The structure of WDJ-1 was characterized by Fourier-transform infrared(FT-IR)spectroscopy,scanning electron microscopy(SEM),and thermogravimetric analysis(TGA),and its performance was evaluated through rheology,plugging capacity,cementation property,and inhibition property experiments.FT-IR confirms the presence of O—H,C=O,B—O,and Fe—O coordination bonds in the molecules of WDJ-1,indicating sufficient reaction between the monomers and the crosslinking agents.SEM reveals that WDJ-1 exhibits a honeycomb structure,which can improve the compactness of the mud cake.A base fluid treated with 2%WDJ-1 has its API fluid loss reduced from 22.4 mL to 3 mL,the shear strength of the coal rock-coal gangue interface reaches 0.16 MPa,the plugging pressure for a 2 mm slot plate increases by 54.5%,and the 48-hour water absorption rate of mud balls is reduced by 10.5%.TGA measurement proves that WDJ-1 exhibits excellent thermal stability below 240℃.WDJ-1 stabilizes wellbore through the four-fold synergistic mechanism of"inhibition-plugging-bonding-high temperature resistance",and the use of which can provide technical support for the safe and efficient drilling of horizontal wells in deep CBM reservoirs.关键词
深层煤岩/井壁稳定剂/封堵性能/胶结性能/抗高温性能Key words
Deep coal rock/Borehole wall stabilizer/Plugging capacity/Bonding capacity/High-temperature resistance分类
能源科技引用本文复制引用
李志勇,董浩安,岑昊天,王西江,金星宇,王宗祥,姜玉涛..适用于深层煤岩气水平井的新型井壁稳定剂[J].钻井液与完井液,2026,43(3):324-330,7.基金项目
国家重点研发计划课题"井筒稳定性闭环响应机制与智能调控方法"(2019YFA0708303). （2019YFA0708303）
