四元共聚抗高温抗盐油井水泥浆降失水剂的合成  

Synthesis and performance evaluation of quadripolymer as a temperature-and salt-resistance oil well cement filtrate reducer

作　　者：李皋[1] 付强[1,2] 余杭航[3] 刘润昌 韦星 曾恒 Li Gao;Fu Qiang;Yu Hanghang;Liu Runchang;Wei Xing;Zeng Heng(State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation//Southwest Petroleum University, Chengdu,Sichuan 610500, China;HSE and Technical Supervision Research Institute of Petro China Southwest Oil & GasfieldCompany, Chengdu, Sichuan 610041, China;Exploration Division, Petro China Southwest Oil & Gasfield Company,Chengdu, Sichuan 610051, China)

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学 [2]中国石油西南油气田公司安全环保与技术监督研究院 [3]中国石油西南油气田公司勘探事业部

出　　处：《天然气工业》2018年第12期96-101,共6页Natural Gas Industry

基　　金："十三五"国家科技重大专项"低渗透油气藏钻井液完井液及储层保护技术"(编号:2016ZX05021-004)

摘　　要：目前的油井水泥浆降失水剂存在着耐温抗盐能力低,在高温下易分解造成浆体过度缓凝、控制滤失能力降低等缺陷。为此,在总结前人研究成果的基础上,选择具有特殊官能团的单体2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、N, N-二甲基丙烯酰胺(DMAA)、丙烯酸(AA)、烯丙基磺酸钠(AS)为合成原料,通过正交实验合成了新型的抗高温、抗盐四元共聚油井水泥浆降失水剂(FRW),并对其进行了结构表征和性能测试。实验结果表明:(1) FRW最佳合成条件为AMPS/AA/DMAA/AS的摩尔比为4.2∶1.8∶3.5∶0.5,引发剂为单体总质量的0.3%,单体质量百分数为40%,反应温度为50℃,pH值为7;(2)结构表征实验反映出,4种单体均参与了共聚反应,FRW的数均分子量和重均分子量分别为86 692、468 689,分子量分布为5.406,具有良好的稳定性能,可承受的最高温度为289℃;(3)添加1%～2%FRW的水泥浆流变性能和力学性能等指标经测试均符合工程要求。结论认为,FRW具有较好的抗温、抗盐和控制失水性能,其适用温度介于90～200℃,在含35%NaCl水泥浆中滤失量为41.2mL,对水泥浆流变性能以及水泥石强度等工程指标无不良影响。Aiming at mitigating the defects of the currently-used oil-well filtrate reducers,a new type of high temperature-and salt-resistance filtrate reducer FRW was synthesized by selecting AMPS,DMAA,AA,AS with special functional groups as raw materials.The optimum synthesis conditions are as follows.(1)The molar ratio of monomers AMPS:AA:DMAA:AS is4.2:1.8:3.5:0.5,the initiator is0.3%of the total mass of the monomer,the mass percentage of the monomer is40%,the reaction temperature is50℃,and the pH value is7.(2)The structure of FRW was characterized by IR and NMR,and the molecular weight and heat resistance were detected by the gel permeation chromatography and thermo gravimetric analysis.Four monomers were in the copolymerization and the average molecular weight(Mw)and the number-average molecular weight(Mn)of the FRW sample product,showing a good stability and its acceptable maximum temperature being up to289℃,is86692and468689respectively and the molecular distribution(Mw/Mn)is5.406.(3)Such indexes as rheological and mechanical properties of the slurry with1–2%FRW all meet with the engineering requirement.In conclusion,FRW is a good filtrate reducer with temperature and salt resistance,a better control of water loss,and being adaptable at90–200℃,having no adverse effects on the rheological properties of cement paste and strength of cement engineering properties.

关 键 词：油井水泥浆 四元共聚 抗高温 抗盐 降失水剂 分子量分布 稳定性 流变性 力学性能 

分 类 号：TE256.6[石油与天然气工程—油气井工程]