油井水泥降失水剂AMPS/DMAM/MAA共聚物的合成与研究

采用水溶液聚合法,以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、N,N-二甲基丙烯酰胺(DMAM)和甲基丙烯酸(MAA)为单体合成了三元共聚物。以共聚物的降失水能力为指标设计正交试验,结果表明,聚合反应的最佳合成条件为:反应温度50℃,引发剂用量1.0%,体系pH值11。通过红外光谱、核磁氢谱和热重分析对其结构和热性能进行了表征,证明了目标产物为AMPS/DMAM/MAA共聚物,该共聚物的分解温度为310℃。对水泥浆的性能研究则表明聚合物具有良好的降失水能力,在淡水中,当聚合物加量超过3%(BWOC)时可在90℃下将水泥浆失水量控制在100mL以内,且水泥石强度发展快,对水泥石力学性能无不良影响。     

油井水泥降失水剂(HCW-1)的合成及性能评价

研究了2-丙烯酰胺-2-甲基丙磺酸(AMPS）、丙烯酸(AA)和一种功能型单体(简称为SM)三元共聚物(HCW-1)的合成方法及在油井水泥浆中的降失水作用,并探讨了其降失水机理。实验结果表明,HCW-1对水泥浆稠化时间和水泥石抗压强度无不良影响,是一种良好的降失水剂。     

AMPS共聚物类抗盐降失水剂HJS-II室内评价

AMPS共聚物是固井工程使用最广泛的聚合物类降失水剂,具有良好的耐温、抗盐和抗水解性能。降失水剂HJS-Ⅱ是以2-丙烯酰胺-2-甲基丙磺酸(AMPS)和丙烯酰胺(AM)为原料,过硫酸铵-亚硫酸氢钠氧化还原体系为引发剂,用水溶液聚合的方法合成一种AMPS/AM共聚物。实验结果表明:HJS-Ⅱ在中温区和高温区适宜掺量为1. 5%和2. 2%; HJS-Ⅱ具有良好的抗盐性能,在质量分数为25%的含盐水泥浆中掺量为3. 5%时可以控制滤失量在50 m L以下。     

耐盐降失水剂AMPS/DMAA/IA的合成及其性能评价

针对目前降失水剂黏度大、易增稠、抗盐能力差等问题,以2-丙烯酰胺基-2甲基丙磺酸（AMPS）、N,N-二甲基丙烯酰胺（DMAA）、衣康酸（IA）为聚合单体,采用水溶液自由基聚合方法合成了适用于海水水泥浆体系的降失水剂AMPS/DMAA/IA。通过红外光谱分析,各单体成功参与聚合反应,经热重分析,三元共聚物AMPS/DMAA/IA耐温可达320℃。经水泥浆性能测试表明,该降失水剂具有优良的降失水性能,抗盐可达饱和;在海水水泥浆体系稠化曲线平稳,无"鼓包"、"包芯"现象;低温下,随着加量增加,对水泥石抗压强度影响较小,无超缓凝现象,在海水水泥浆中具有良好的综合性能。     

AMPS共聚物固井降失水剂的合成及性能研究

讨论了合成条件对2-丙烯酰胺基-2-甲基丙磺酸(AMPS)/丙烯酰胺(AM)共聚物固井降失水剂性能的影 响,并对产物的降失水能力进行了初步评价。     

AMPS／AM共聚物的合成

本文以丙烯酰胺,2-丙烯酰胺基-2-甲基丙磺酸为原料,以水为溶剂,采用氧化-还原引发体系,合成了2-丙烯酰胺基-2-甲基丙磺酸-丙烯酰胺二元共聚物降失水剂。探讨了共聚物降失水性能对合成条件的依赖性,评价了共聚物对泥浆的降滤失效果。实验结果表明,本文共聚物抗盐、抗温能力强,在淡水、盐水、饱和盐水和人工海水泥浆中均具有良好的降失水作用。     

P(AM/AMPS/NVP)降失水剂合成与耐温性能研究

采用自由基水溶液聚合法成功制备了丙烯酰胺(AM)/2-甲基-2-丙烯酰胺基丙磺酸(AMPS)/N-乙烯基吡咯烷酮(NVP)三元共聚耐温型降滤失剂,通过红外(FTIR)光谱和核磁C谱表征了共聚物的结构,通过元素分析考察了共聚物组成。热失重(TGA)表明,P(AM/AMPS/NVP)耐温性优于P(AM/AMPS)和P(AM),通过对三元共聚物的抗高温性和降失水性的研究,表明P(AM/AMPS/NVP)具有良好的耐温降滤失性能。     

耐盐抗温型丙烯酰胺三元共聚物的制备及溶液性质

以丙烯酰胺(AM)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)及甲基丙烯酰氧乙基二甲基十二烷基溴化铵(AQ12)为原料,采用水溶液聚合法制备系列三元丙烯酰胺共聚物。正交实验确定最佳反应条件:反应温度5℃,引发剂浓度0.05%,单体质量浓度20%。用傅里叶变换红外光谱仪和核磁共振仪确证了三元共聚物的结构。聚合物的溶液性质表明,该三元共聚物具有一定的耐盐和抗温性能。     

耐盐抗温型丙烯酰胺三元共聚物的制备及溶液性质

以丙烯酰胺(AM)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)及甲基丙烯酰氧乙基二甲基十二烷基溴化铵(AQ12)为原料,采用水溶液聚合法制备系列三元丙烯酰胺共聚物。正交实验确定最佳反应条件:反应温度5℃,引发剂浓度0.05%,单体质量浓度20%。用傅里叶变换红外光谱仪和核磁共振仪确证了三元共聚物的结构。聚合物的溶液性质表明,该三元共聚物具有一定的耐盐和抗温性能。     

正交设计法合成共聚物型水泥降失水剂的研究

本文利用2-丙烯酰胺基-2-甲基丙磺酸(AMPS)／丙烯酰胺(AM)／丙烯酸(AA)三种单体,根据自由基聚合原理,合成一种三元共聚物型油井水泥降失水剂。利用正交设计法设计了实验方案,分别考察了单体配比、反应温度、引发剂用量和链转移剂用量等因素对其降失水性能的影响,并对产物进行了’红外光谱、差热分析和N、S元素的测定。分析表明单体配比和反应温度是影响聚合物降失水性能的主要因素,并得到了最佳的合成方案：AMPS：AM：AA=50：42：8,反应温度70℃,引发剂用量2％,链转移剂用量6％。     

MTC技术提高固井二界面胶结强度实验研究

本文对MTC固井液二界面胶结强度进行了实验研究。研究表明：与常规水泥石相比,MTC固化体能够与残余钻井液、钻井液泥饼实现整体固化胶结,MTC固化体体积收缩率较小,井壁界面条件特别是有泥饼时对常规水泥石的二界面胶结强度影响较大,但对MTC固化体的二界面胶结强度影响较小,MTC固井液可以有效地提高固井二界面胶结强度,从而提高固井质量。     

废弃砂浆粉对水泥物理力学性能的影响

研究了废弃砂浆粉对水泥物理力学性能的影响,测试了标准稠度需水量、凝结时间、流动度和强度.结果表明:废弃砂浆粉的掺加导致水泥的标准稠度需水量增加,水泥的凝结时间总体降低,水泥净浆的流动度及流动度损失均呈降低趋势,而减水剂与水灰比对水泥净浆的流动度及流动度损失有较大影响.废弃砂浆粉掺加量的多少将直接影响到水泥砂浆的强度,掺量越大,水泥砂浆强度损失越严重,而掺量低于10%时,水泥砂浆仍具有较高的抗压强度和抗折强度.微观结构特征表明,废弃砂浆粉掺量在一定范围时,水泥砂浆体系中产生钙矾石与C-S-H凝胶较多,体系结构密实性好.     

水滑石插层降失水剂的制备和性能研究

随着石油开发逐渐转向陆地深层、超深层,固井工程对油井水泥降失水剂的要求越来越高,降失水剂在高温高盐地层依然需要具备良好的控水特性.为了满足油井水泥降失水剂耐高温的性能,将有机聚合物降失水剂与新型无机材料水滑石结合起来,研制出一种耐高温耐盐的新型油井水泥降失水剂.选择2-丙酰胺基-2-甲基丙磺酸(AMPS)、对苯乙烯磺酸...     

Preparation and performance evaluation of hydrophobically associating polymer anti-water channeling agent for oil well cement

The channeling resistance of cement slurry is one of the critical factors related to cementing quality, especially in the cementing of adjustment well. Due to the complex pressure layer and large pressure fluctuation, the annular channeling problem is easily caused by water invasion. Using 2-acrylamide-2-methyl propane sulfonic acid (AMPS), acrylamide (AM), maleic anhydride (MA), acrylic ester 18(St) as raw materials, we prepared a hydrophobic associative polymer (SMAL) by free radical micellar polymerization. The synthetic products were characterized by IR, NMR, and SEM, and the evaluated engineering application performance. The results showed that SMAL achieved the expected synthesis purpose. Compared with the water channeling pressure of 0.1 Mpa for blank cement slurry, the water channeling pressure of SMAL cement slurry reaches 5.3 Mpa, which significantly improves the anti-water channeling ability of cement slurry. After adding SMAL, the 14d flexural strength of cement stone was also increased from 7.7 to 8.3 MPa, which had no adverse effect on cement slurry's rheological property.     

水泥浆粉去除废水中铅离子效果及行为研究

水泥浆粉含有可吸附重金属离子的成分,可作为吸附剂来处理重金属离子废水。本文利用硅酸盐水泥制备了不同水化龄期的水泥浆粉来处理含Pb²⁺废水,通过X射线衍射仪、同步热分析仪、电感耦合等离子体发射光谱仪等测试方法,研究了水泥浆粉龄期、浆粉用量、Pb²⁺浓度、pH值、温度、时间对Pb²⁺去除效果及吸附行为的影响。结果表明,水泥浆粉对废水中的Pb²⁺去除率普遍大于80%。在35 ℃、pH=2、吸附时间200 min时,0.04 g水灰比为0.50、水化龄期为60 d的水泥浆粉对初始浓度为700 mg/L的Pb²⁺溶液的Pb²⁺去除率为96.06%,吸附容量为336.22 mg/g。水泥浆粉对Pb²⁺的吸附热力学符合Freundlich吸附等温模型,吸附动力学符合拟一级动力学模型。     

粉煤灰-微硅-水泥三元复合低密度充填水泥浆在页岩油水平井的应用

为提高页岩油水平井上部固井质量,通过浆体稳定性差异反向优化颗粒配比,采用碱石灰和硫酸镁制备新型水化激活剂,结合²⁹Si NMR进行反应程度定量分析,开发了一种粉煤灰-微硅-水泥三元复合低密度充填水泥浆,并开展了五口井的工程试验。结果表明,粉煤灰和微硅的最佳加量分别为40%、35%(质量分数),碱石灰与硫酸镁的配比为3∶1(质量比)时组成的激活剂效果最好,可将油井水泥的反应剩余量降低29.59%,粉煤灰的反应剩余量降低68.61%,常温下3 d、7 d抗压强度分别提升129%和92%,三元复合体系的失水、游离液、稠化时间等均能满足固井充填需求,现场应用表明固井合格井段占比超过90%,体系具有良好的应用前景。     

Working mechanism of poly(vinyl alcohol) cement fluid loss additive

The working mechanism of poly(vinyl alcohol) (PVA, M_w ～ 200,000 g mol^?1), a fluid loss control additive (FLA) applied in oil well cementing, was investigated. First, characteristic properties of PVA such as solubility and particle size in cold and hot water, minimum film forming temperature, adsorption on cement, viscosity of cement pore solution and static filtration properties of cement slurries treated with PVA were determined. It was found that the working mechanism of PVA relies on hydrated, but water‐insoluble PVA particles (d₅₀ ～ 2.4 μm). During cement slurry filtration, they coalesce into a polymer film. This film effectively plugs the pores of the cement filter cake. The sample studied here becomes water‐soluble at temperatures > 40°C (d₅₀ decreases to ～50 nm) and looses its effectiveness. Addition of highly anionic dispersants such as ß‐naphthalenesulfonate formaldehyde (BNS) or acetone formaldehyde sulfite (AFS) polycondensate extends the temperature range at which PVA works from 40°C to ～60°C. This effect is ascribed to lower solubility of PVA in the presence of these dispersants. The study reveals that decreased performance of PVA caused by higher temperatures is not the result of thermal degradation of the polymer, but is owed to its increasing water‐solubility. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

调整井固井用聚合物型抗水侵材料的制备及其性能评价

针对调整井固井时水侵导致的环空窜流问题,本文以AMPS、AM、AA和SA为原料,通过自由基胶束聚合法制备一种水溶性疏水缔合聚合物AAAS来增强固井水泥浆的抗水侵能力,改善水泥浆的防窜能力,以提高该类井的固井质量。利用红外、核磁、扫描电镜及凝胶渗透色谱等手段对AAAS进行了微观分析表征,并对AAAS水泥浆体系的抗水侵性能及基本工程性能进行了评价,结果表明AAAS可明显提高水泥浆体的抗水侵能力,较之于空白水泥浆水侵后0.3MPa的窜通压力,加量为0.9%AAAS的水泥浆体系,其水侵后的窜通压力提高达到了6.9MPa,大幅度提高了水泥浆的防窜能力,且14天抗折强度为8.2MPa,抗压强度为31.5MPa,能够满足调整井固井水泥环长期封固的需要。因此,AAAS在调整井固井工程抗水侵和防窜中具有良好的应用前景。     

Preparation and characterization of epoxy/slag composite for cement slurry applications

In this study, epoxy/slag composites (ESCs) were prepared by using diglycidyl ether of bisphenol‐A epoxy resin, water‐quenched granulated blast furnace slag as filler, phenolic aldehyde amine as hardener, and titanate as coupling agent. The properties of ESC, including chemical structure, thermal stability, wetting properties, and morphological structure, were investigated by using Fourier transform infrared spectroscopy, thermogravimetric analysis, a contact angle meter, scanning electron microscopy, and energy dispersive spectrometry. The results show that ESCs possess excellent thermal stability, hydrophilicity, and good compatibility with cement slurry compared to pure epoxy. In addition, the applications of ESC in a cement slurry were also investigated. It was found that the fluidity, free water, fluid loss, and content of Ca(OH)₂ decreased, while the compressive strength increased with the incorporation of slag into the epoxy matrix. These features were attributed to the pozzolanic reaction of slag by consumption of Ca(OH)₂ to form calcium silicate hydrate (C‐S‐H) gel which contributed more to the compressive strength of set cement. Finally, lightweight cement containing ESCs exhibited high strength without affecting the density of the light cement slurry under curing pressure and at high mixing rate compared with lightweight cement made of floating beads. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43359.