八胺基星形小分子抑制剂的制备及其性能  

Preparation and Performance Study of an Octaamino Star-Shaped Low Molecular Weight Polymer Inhibitor

作　　者：刘锋报[1] 张顺从 晏智航 罗霄 董樱花 孙爱生 LIU Fengbao;ZHANG Shuncong;YAN Zhihang;LUO Xiao;DONG Yinghua;SUN Aisheng(PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000;College of Chemistry&Environmental Engineering,Yangtze University,Jingzhou,Hubei 434000)

机构地区：[1]中石油塔里木油田分公司,新疆库尔勒841000 [2]长江大学化学与环境工程学院,湖北荆州434000

出　　处：《钻井液与完井液》2021年第3期317-323,共7页Drilling Fluid & Completion Fluid

基　　金：塔里木油田公司项目“库车山前盐上硬脆性泥岩防塌技术研究及现场应用”(300119070204)。

摘　　要：目前使用的超支化多胺小分子抑制剂存在伯胺基团密度较低、在高pH值环境中抑制性不足等缺陷。针对此情况,以季戊四醇为原料,通过两步反应,制得了具有规整分子结构与高胺基密度的八胺基星形小分子(OASS)。分子模拟结果表明,OASS在黏土表面的吸附密度与季戊四胺(PTTA)、3,3-双(2-氨基乙基)-1,5-戊二胺(BAPD)差别不大,但单分子吸附能大幅高于PTTA、BAPD,表明3种多胺小分子在黏土表面的吸附中心均由胺基提供,且胺基密度高的OASS具有更强的吸附能力。吸附性能测定表明,OASS在25℃下的饱和吸附量只有1.12 mmol/L,达到饱和吸附量时所需的物质的量浓度仅为10 mmol/L。抑制黏土造浆、线性膨胀与滚动回收等室内实验结果表明,OASS对黏土与泥页岩岩屑造浆的抑制性能均显著优于PTTA与BAPD;与现场钻井液的配伍性实验表明,OASS不会影响钻井液老化前后的流变性能,且可改善降滤失性能,并提高泥页岩在钻井液中的滚动回收率。研究结果证明,OASS具有优异的抑制性能,且可与不同钻井液体系形成良好配伍。The hyperbranched low molecular weight polyamine inhibitors presently in use have some deficiencies such as low density of primary amino groups and lack of inhibitive capacity in high pH environment.To overcome these deficiencies,an octaamino star-shaped low molecular weight polymer(OASS)with regular molecular structure and high density of amino groups was developed through two-step reaction with pentaerythritol as the raw material.Molecular simulation of OASS showed that the adsorption density of OASS on the surfaces of clays is almost the same as that of pentaerythrityltetramine(PTTA)and 3,3-bis(2-aminoethyl)-1,5-pentanediamine(BAPD),but the adsorption energy of a single molecule layer of OASS is significantly greater than that of PTTA and BAPD,indicating that the adsorption centers of the three polyamines on the clay surfaces are all provided by the amino groups,and OASS which has the highest amino group density has the highest adsorption capacity.Test on the adsorption capacity of OASS showed that at 25℃,the saturated adsorption capacity of OASS is only 1.12 mmol/L,and the molar concentration of OASS at saturated adsorption capacity I sonly 10 mmol/L.Laboratory experiment on the capacity of OASS in inhibiting clay yield and linear expansion,and in percent recovery of drilled cuttings in hot roller test showed that OASS is remarkably superior to PTTA and BAPD in inhibiting the yield of shale cuttings.Laboratory experiment also showed that OASS is compatible with filed drilling fluids and does not affect the rheology of the drilling fluids before and after aging.OSAA also helped improve the filtration control property of the drilling fluids.The results of the study have prove d that OASS has excellent inhibitive capacity and is well compatible with different drilling fluids.

关 键 词：钻井液添加剂 抑制剂 超支化 多胺小分子 分子动力学模拟 吸附量 抑制性能 

分 类 号：TE254.4[石油与天然气工程—油气井工程]