耐200℃高温、低伤害压裂液稠化剂  

Fracturing Fluid Thickener with High Temperature Resistance and Low Damage

作　　者：罗志锋[1] 张浩飞 赵立强[1] 何杰 扶浩然 赵金明 闫朝宗 LUO Zhifeng;ZHANG Haofei;ZHAO Liqiang;HE Jie;FU Haoran;ZHAO Jinming;YAN Chaozong(National Key Laboratory of Reservoir Geology and Development Engineering(Southwest Petroleum University),Chengdu,Sichuan 610500,P R of China)

机构地区：[1]油气藏地质及开发工程全国重点实验室(西南石油大学),四川成都610500

出　　处：《油田化学》2024年第3期393-399,405,共8页Oilfield Chemistry

基　　金：国家自然科学基金面上项目“缝洞型碳酸盐岩靶向酸压复杂裂缝扩展机理及调控方法研究”(项目编号51974264)。

摘　　要：为提高压裂液稠化剂的耐高温、低伤害性能,以丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和N-乙烯基吡咯烷酮(NVP)作为共聚单体,采用水溶液自由基聚合法制得压裂液稠化剂(ADAN)。通过单因素变量法优选了制备条件,分析了ADAN的结构和稳定性,评价了含ADAN压裂液的耐温耐剪切性、降阻性、静态携砂性和破胶性。结果表明,最佳的共聚物配比及反应条件为:单体占总反应体系质量的20%、4种单体(AM、AMPS、DMC、NVP)的物质的量比为14∶2∶3∶1、引发剂(质量比为1∶1的K_(2)SO_(3)和NaHSO_(3))用量占体系总质量的0.4%、pH值为7、反应温度为45℃、反应时间8 h。在此条件下制得的ADAN热稳定性良好,在40~260℃下的质量损失约为10%。0.8%ADAN与有机锆交联剂、高温稳定剂亚硫酸钠、破胶剂过硫酸铵等配制的压裂液具备良好的耐温耐剪切性、降阻性、静态携砂性和破胶性。在200℃、剪切速率为170 s^(-1)下剪切140 min后的黏度仍高于90 mPa·s;在100~160 L/min的流量变化区间内,降阻率由48%上升至63%;陶粒在压裂液中静置12 h后的沉降距离为6.3 cm,沉降速度为0.875×10^(-2)cm/min;破胶后的残渣含量为86 mg/L。ADAN压裂液可耐200℃高温,并对储层的伤害较小,满足现场施工及地层需要。In order to improve the high temperature resistance and low damage performance of fracturing fluid thickener,the fracturing fluid thickener(ADAN)was prepared by aqueous free radical polymerization using acrylamide(AM),methylacryloxyethyl trimethylammonium chloride(DMC),2-acrylamido-2-methylpropanesulfonic acid(AMPS)and N-vinylpyrrolidone(NVP)as monomers.The preparation conditions were optimized by single factor variable method,the structure and stability of ADAN were analyzed,and then the temperature and shear resistance,resistance reduction,static sand carrying and breaking properties of the fracturing fluid containing ADAN were evaluated.The results showed that the optimum copolymer ratio and reaction conditions were obtained as follows:20%monomer in total mass of reaction system,14∶2∶3∶1 the molar ratio of 4 monomers(AM,AMPS,DMC,NVP),0.4%initiator(K_(2)SO_(3) and NaHSO_(3) with mass ratio of 1∶1)in total mass of reaction system,7 pH value,45℃reaction temperature,8 h reaction time.ADAN prepared under these conditions had good thermal stability.The mass loss was about 10%at 40—260℃.The fracturing fluid prepared with 0.8%ADAN,organozirconium crosslinking agent,high temperature stabilizer sodium sulfite and gel breaker ammonium persulfate had good temperature and shear resistance,resistance reduction,static sand carrying and breaking properties.The viscosity was still higher than 90 mPa·s after shearing for 140 min at 200℃and 170 s^(-1).In the flow range of 100—160 L/min,the resistance reduction rate increased from 48%to 63%.The settling distance and settling velocity of ceramic particles were 6.3 cm and 0.875×10^(-2) cm/min after standing in fracturing fluid for 12 h.The residue content after gel breaking was 86 mg/L.ADAN fracturing fluid could withstand the high temperature of 200℃,meanwhile the damage to the reservoir was less,which met the needs of field construction and formation.

关 键 词：聚合物 稠化剂 压裂液 耐温 低伤害 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]