P（AMPS-DMAM）共聚物钻井液降滤失剂的合成

采用氧化-还原引发体系,以2-丙烯酰氨基-2-甲基丙磺酸、N,N-二甲基丙烯酰胺为原料,通过均匀设计优化,合成了P（AMPS/DMAM）共聚物钻井液降滤失剂,借助红外光谱对聚合物进行了结构表征,初步评价了共聚物的钻井液性能。结果表明,P（AMPS/DMAM）共聚物作为钻井液处理剂,热稳定性好,抗温能力强,在淡水、盐水和饱和盐水钻井液中均具有较好的降滤失作用,经过220℃高温老化后仍能较好地控制钻井液的滤失量。     

抗钙钻井液降滤失剂P(AMPS-DEAM)聚合物的合成

采用氧化-还原引发体系,以N,N-二乙基丙烯酰胺和2-丙烯酰基-2-甲基丙磺酸为原料,合成了P(AMPS-DEAM)共聚物抗高温抗钙钻井液降滤失剂。通过正交实验优化了配方及合成条件:m(DEAM):m(AMPS)=0.9:1、反应温度40℃、单体质量分数25%、引发剂用量0.22%,用红外光谱对聚合物的结构进行了表征,初步评价了共聚物的钻井液性能。结果表明,P(AMPS-DEAM)共聚物热稳定性好,作为钻井液处理剂,在淡水、盐水、饱和盐水和CaCl_2钻井液中均具有较好的降滤失作用。经过180℃超高温老化后仍能较好地控制钻井液的滤失量,体现出了良好的抗温、抗盐和抗钙性能。     

淀粉接枝AM／SSS／DAC降滤失剂的制备与性能

以过硫酸铵和亚硫酸氢钠为氧化还原引发剂,采用水溶液聚合将淀粉、丙烯酰胺（AM）、丙烯酰氧基三甲基溴化铵（DAC）和苯乙烯磺酸钠（SSS）接枝共聚制备了淀粉接枝聚合物降滤失剂,探讨了引发剂用量、苯乙烯磺酸钠用量和温度等对淀粉接枝聚合物降滤失剂水溶液表观粘度的影响,以及DAC含量对淀粉接枝聚合物钻井液性能的影响,采用XRD衍射对淀粉接枝聚合物降滤失剂的结构进行表征。结果表明所合成的淀粉接枝聚合物降滤失剂水溶液表观粘度的温度敏感性较低,淀粉接枝聚合物钻井液在高浓度盐水基浆（20％NaCl和10％CaCl2）中具有较好的降滤失性和抗盐性,XRD证实了淀粉接枝聚合物降滤失剂的结构。     

共聚物PAAND作钻井液降滤失剂的合成及应用评价

以丙烯酰氧乙基三甲基氯化铵(DAC)、乙烯基吡咯烷酮(NVP)、丙烯酰胺(AM)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,(NH4)2S2O8-Na HSO3为引发剂,采用自由基水溶液聚合的方式合成了一种四元共聚物钻井液降滤失剂。通过正交实验确定了具有最佳降滤失效果的合成条件,采用FTIR及1HNMR对共聚物的结构进行了表征。性能评价结果表明,合成的共聚物具有良好的耐温抗盐和降滤失性能,聚合物质量分数为1.5%时,淡水、盐水、饱和盐水以及复合盐水基浆的API滤失量(0.7 MPa,30 min)分别为5.6、9.7、19.0和16.1 m L。与新疆油田常用的SP-8、JT888、MAN104和HJ-3这4种降失水剂相比,合成的聚合物表现出了更好的降滤失性能。现场适用评价表明,该降滤失剂与新疆油田常用的钾钙基聚磺钻井液体系、正电胶钻井液体系以及聚磺钻井液体系都具有良好的现场适用性。     

AM／AOPS／DEDAAC共聚物防塌降滤失剂的合成

采用氧化一还原引发体系合成了丙烯酰胺／2-丙烯酰氧基-2-甲基丙基磺酸／二乙基二烯丙基氯化铵三元共聚物。初步评价了共聚物的钻井液性能。结果表明,AM／AOPS／DEDAAC共聚物具有较好的耐温抗盐能力。     

新型抗高温抗盐钻井液降滤失剂的研究现状

随着油田钻井的发展和深井海洋钻井项目的增加,对钻井降滤失剂的要求也不断提高,以满足耐盐性和抗高温性的新要求.2-丙烯酰胺基-2-甲基丙磺酸的分子结构中具有强阴离子性、亲水性的磺酸基和不饱和乙烯基双键,以其为基料的多元聚合物具有良好的热稳定性和抗盐能力,是一种新型的抗高温抗盐钻井液用降滤失剂,是今后油田钻井添加剂的一个重要发展方向.     

AMPS／AM／DMAM共聚物钻井液降滤失剂的合成

以丙烯酰胺（ＡＭ）、２－丙烯酰胺基－２－甲基丙磺酸（ＡＭＰＳ）和Ｎ,Ｎ－二甲基丙烯酰胺（ＤＭＡＭ）为原料,合成了一种新型耐温抗盐聚合物钻井液降滤失剂,并对其性能进行了室内评价。结果表明,本文合成的共聚物降滤失剂在淡水泥浆、饱和盐水泥浆和含钙泥浆中均具有较好的降滤失作用,抗温、抗盐能力强。     

一种抗盐抗温降滤失剂的合成及性能研究

采用丙烯酰胺（AM）、2-丙烯酰胺基-2-甲基丙磺酸（AMPS）、丙烯酸（AA）等单体共聚合成了一种抗温抗盐降滤失剂,分析了影响合成产品的各种因素,优选了反应条件,评价了合成共聚物在淡水钻井液、盐水钻井液、饱和盐水钻井液中的降滤失效果,研究了合成共聚物的抗盐效果、抗温能力、抗钙能力和黏土膨胀抑制性。结果表明：合成共聚物具有良好的降滤失作用和抗温抗盐抗钙性能,增强了钻井液抑制泥页岩水化的能力。     

抗高温抑制型钻井液降滤失剂的合成与评价

以甲基丙烯酰氧乙基三甲基氯化铵(DMC)、对苯乙烯磺酸钠(SSS)、丙烯酰胺(AM)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,(NH_4)_2S_2O_8-Na HSO_3为引发剂,采用自由基水溶液聚合方式合成了一种抗高温钻井液降滤失剂。通过合成条件的单因素实验评价了聚合物的降滤失性能,用红外光谱法对共聚物的结构进行了表征。实验结果表明,聚合物质量分数为2%时,淡水、饱和盐水以及复合盐水钻井液的FL_(API)分别为5.2、7.4 m L和6.8 m L,淡水钻井液经200℃老化16 h后的FL_(API)为10.6 m L,饱和盐水钻井液经180℃老化16 h后的FL_(API)为16.4 m L。聚合物质量分数为1%的淡水钻井液经100℃老化16 h后的页岩相对回收率为97.1%。     

腐殖酸接枝共聚物超高温钻井液降滤失剂合成

基于抗高温处理剂分子设计,采用腐殖酸与丙烯酰氧丁基磺酸（AOBS）、丙烯酰胺（AM）、丙烯酸（AA）接枝共聚,通过正交实验,在综合考虑产物的水溶液黏度、产物对钻井液黏度和降滤失效果影响的基础上,进一步考察了腐殖酸用量,     

两性聚丙烯酰胺絮凝性能的研究

以丙烯酰胺(AM)为主要原料,2-丙烯酰胺-2-甲基丙磺酸(AMPS)和甲基丙烯酰氧乙基三甲基氯化铵(DMC)为共聚单体,合成了AM/AMPS/DMC两性聚丙烯酰胺。以高岭土悬浮液作为模拟废水,研究了AM/AMPS/DMC两性聚丙烯酰胺的絮凝性能。结果表明:两性聚丙烯酰胺作为絮凝剂可以适用于处理不同电荷类型的污水,对pH值的适应范围较宽;其絮凝效果与其投料量存在着一定的关系,在30℃到70℃的温度范围内,升高温度有利于絮凝效果的提高。     

NaHm/AMPS/AM/AA接枝共聚物降滤失剂的合成

文章以腐殖酸为原料制得可溶性腐植酸钠,再以2-丙烯酰胺基-2-甲基丙磺酸、丙烯酰胺、丙烯酸和腐植酸钠为单体,采用过硫酸钾为引发剂,用水溶液聚合法合成了抗高温降滤失剂,通过设计正交试验得到最佳反应条件:m(2-丙烯酰胺基-2-甲基丙磺酸)∶m(丙烯酰胺)∶m(丙烯酸)∶m(腐植酸钠)=3∶2∶1∶4,引发剂所占反应物的质量分数为0.7%,反应温度为65℃,pH=7,通过钻井液流变性能及滤失性测试,结果表明合成的降滤失剂有较好的提粘切作用、较好的高温(200℃)降滤失性能、抗盐至饱和。     

Preparation and evaluation of acryloyl morpholine modified emulsion fracturing fluid thickener with high temperature resistance and salt resistance

To prepare the thickener of fracturing fluid with temperature resistance, salt resistance and quick dissolution, an emulsion thickener (ASC) was synthesized by acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and acryloyl morpholine. The dissolution, salt resistance and drag reduction of ASC, and the viscoelasticity, temperature resistance and shear resistance and gel breaking properties of fracturing fluid formed by ASC and zirconium crosslinker were investigated. The results showed that the sticky time of ASC was less than 60 s and the drag reduction rate was 72.5% in 100,000 mg/L brine, showing that ASC had thickening ability in high salinity brine and satisfied the requirements of continuous fluid preparation on the fracturing process. The viscosity of ASC fracturing fluid was 98 mPa s after shearing at 200°C and 170 s⁻¹ for 150 min when the salinity was 100,000 mg/L. When the ammonium persulfate concentration was 400 mg/L, the viscosity of the broken fluid was 4.0 mPa s. The temperature resistance, salt resistance and shear resistance of ASC emulsion fracturing fluid could be significantly improved by the introduction of acryloyl morpholine, ASC fracturing fluid had the characteristics of high elasticity and low viscosity, which could meet the application requirements under ultra-high temperature reservoirs.     

SSS/AMPS/AA/MA四元聚合物合成及阻垢性能研究

磺酸基团对盐不敏感,具有较好的抗温抗盐能力,尤其是抗高价金属离子的能力。因此,磺酸盐类共聚物成为近几十年来人们研究的热点。以苯乙烯磺酸钠（SSS）、2-丙烯酰胺基-2-甲基丙基磺酸（AMPS）、丙烯酸（AA）、马来酸酐（MA）为单体,水作溶剂,过硫酸铵为引发剂,次亚磷酸钠为链转移剂,确定了最佳的合成条件,合成的SSS/AMPS/AA/MA四元共聚物对碳酸钙垢、硫酸钙垢、磷酸钙垢表现出较好的阻垢性能,同时具有良好的分散氧化铁的能力和较强的稳定锌离子的能力。     

高分散聚合法制备新型两性包被絮凝剂

采用分散聚合工艺,以丙烯酰胺、2-丙烯酰胺基-2-甲基丙磺酸和二甲基二烯丙基氯化铵3种单体为原料,合成了6个不同黏均相对分子质量的共聚物,探讨了引发剂和稳定剂对特性黏数的影响以及反应时间和转化率的关系,并对不同黏均相对分子质量的共聚物的絮凝能力、抑制性以及抗温性能进行了测定和表征。结果表明,黏均相对分子量和特性黏数随引发剂和稳定剂用量的增加先增大后减小;转化率随反应时间呈饱和曲线特征;其中3#共聚物清液体积为330 mL,页岩回收率65%(120℃)和57%(150℃),岩心膨胀率为128%,黏度保留率高,可以在钻井液和完井液中作为一种良好的絮凝剂。     

Synthetic copolymer (AM/AMPS/DMDAAC/SSS) as rheology modifier and fluid loss additive at HTHP for water-based drilling fluids

In the petroleum industry, high temperature and high pressure (HTHP) would dramatically worsen rheological properties and increase fluid loss volumes of drilling fluids. Synthetic polymer as an indispensable additive has attracted more and more attention recently. In this article, a new copolymer (named AADS) of 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, dimethyl diallyl ammonium chloride, and sodium styrene sulfonate was synthesized through aqueous solution polymerization. The chemical structure of the copolymer was characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance. Moreover, its thermal stability was simultaneously analyzed using a differential scanning calorimetry. The results showed that the synthetic polymer contained all the designed functional groups, and its structure was consistent to the desired one. Under contamination of sodium chloride, AADS solution maintained relatively high viscosity in high concentration brine, showing a good antisalt capacity. Furthermore, the effect of AADS content and temperature on rheological behavior and fluid loss volume of the water-based drilling fluid (WBDF) containing the synthesized product were investigated according to the American Petroleum Institute standard. Results showed that the rheological and filtration properties of the prepared WBDF were improved with the increase in the AADS concentration before and after the thermal aging test. In addition, in the temperature range of 80–240 °C, a reversible rheological behavior was observed during the heating–cooling process, and the HTHP fluid loss was controlled within 22.5 mL, suggesting that the copolymer AADS was suitable for making WBDF s with high temperature resistance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47813.     

Synthesis of novel zwitterionic polymers and their properties as filtrate reducer for water-based drilling fluid

The development of high-temperature and salt-resistant filtrate reducer is of great significance to the exploitation of deep and ultra-deep wells. In this study, Zwitterionic copolymer PANDS was synthesized by free radical polymerization using acrylamide (AM), N-vinylpyrrolidone (NVP), methacryloxyethyl trimethyl ammonium chloride (DMC) and sodium p-styrene sulfonate (SSS) as monomers. Through orthogonal test, the optimum synthesis conditions were determined as follows: n (AM): n (NVP): n (SSS): n (DMC) = 3.5:2:0.5:0.5, the reaction temperature is 50°C, the initiator concentration is 0.4 wt%. The structure and thermal stability of the copolymers were analyzed by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (¹H-NMR) and thermogravimetry (TG). In addition, the filtration reduction performance of PANDS was evaluated according to the American Petroleum Institute (API) standard. The mechanism of reducing filtration loss was studied by laser particle size analysis, Zeta potential and scanning electron microscope analysis of mud cake. The results show that PANDS has good temperature resistance and good filtrate loss reduction. With the addition of 1.5%PANDS, the filtrate loss of drilling fluid is 8.7 mL after aging at 160°C for 16 h, and can resist 6 wt% NaCl and 1 wt% CaCl₂.