水基钻井液用低增黏提切剂的合成与性能评价  

Synthesis and Evaluation of a Low Viscosity Gelling Agent for Water Base Drilling Fluids

作　　者：褚奇 石秉忠[1,2] 李涛 李胜[1,2] 唐文泉 CHU Qi;SHI Bingzhong;LI Tao;LI Sheng;TANG Wenquan(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 100101;Sinopec Research Institute of Petroleum Engineering,SINOPEC,Beijing 100101)

机构地区：[1]页岩油气富集机理与有效开发国家重点实验室,北京100101 [2]中国石化石油工程技术研究院,北京100101

出　　处：《钻井液与完井液》2019年第6期689-693,共5页Drilling Fluid & Completion Fluid

基　　金：“十三五”国家科技重大专项“低渗透油气藏高效开发钻完井技术”课题“川西低渗气藏低伤害钻井液技术研究”(2016ZX05021004-002);中石化科技部项目群课题四“龙门山前雷口坡组气藏钻完井及投产关键技术研究”专题一“超深大斜度井/水平井安全优快钻井关键技术”(P16095)

摘　　要：为了实现在调控钻井液黏度的情况下获得良好的携岩能力,以丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、二甲基二烯丙基氯化铵(DMDAAC)、甲基丙烯酰氧乙基-N,N-二甲基丙磺酸(DMAPS)和十六烷基疏水单体(C16-D)为原料,采用自由基聚合法,制备了一种新型的两性疏水缔合聚合物(PAADDC)。采用傅里叶变换红外光谱(FTIR)和核磁共振(1H NMR)表征了PAADDC的分子结构,采用静态光散射(SLS)测定了聚合物的分子量,并对其流变性能进行了评价。结果表明,100℃老化16 h,加量为0.2%PAADDC的钻井液的表观黏度、塑性黏度、动切力和动塑比分别为18.5 mPa·s,11.5 mPa·s,7.0 Pa和0.61 Pa/mPa·s,抗温可达160℃。与常规增黏剂相比,PAADDC具有良好的热稳定性和更佳的抑黏增切效果。在60~180℃热老化实验中,动塑比值随PAADDC用量的增加而降低。环境扫描电镜(ESEM)和原子力显微镜(AFM)的观察表明,PAADDC在溶液中形成了连续的三维网状结构,这是其剪切强度显著提高的主要原因。A new zwitterionic hydrophobically associating polymer PAADDC has been synthesized by radical polymerization using monomers such as acrylamide(AM),2-acrylamido-2-methylpropane sulfonic acid(AMPS),dimethyl diallyl ammonium chloride(DMDAAC),3-dimethyl(methacryloyloxyethyl)ammonium propane sulfonate(DMAPS)and a cetyl monomer(C16-D).PAADDC was developed for improving the cuttings carrying capacity of water base drilling fluids at controlled viscosity.The PAADDC synthesized was characterized by FT-IR and 1HNMR,and its molecular weight was determined by static light scattering(SLS)method.Drilling fluids treated with 0.2%PAADDC,after aging 16 h at 100℃,had properties as follows:AV=18.5 mPa·s,PV=11.5 mPa·s,YP=7 Pa and YP/PV=0.61 Pa/mPa·s.This drilling fluid was resistant to high temperatures to 160℃.Compared with other filter loss reducers,PAADDC has better thermal stability and better suspending performance at controlled viscosity.In aging test at 60-180℃,the YP/PV ratio of the drilling fluid was decreasing with increase in the concentration of PAADDC.ESEM and AFM examination of the molecular behavior of PAADDC showed that in solution PAADDC forms a continuous 3D network structure,which is taken as the main factor of obviously increasing the shearing strength of the drilling fluids.

关 键 词：水基钻井液 提切剂 流变性能 

分 类 号：TE254.4[石油与天然气工程—油气井工程]