抗盐弱缓凝性固井降失水剂的研制
发布时间：2019-05-17 17:08
【摘要】：设计、调配出综合性能优异的油井水泥浆是固井工程中保证固井质量的一个重要步骤。油气井所在的地质环境正变得越来越复杂,如高温、冻土、渗漏及盐膏地层等。因此,对水泥浆性能的要求也随之提高。在水泥性能限定的条件下,提高水泥浆的性能是通过向水泥中加入如降失水剂、缓凝剂等添加剂来实现的。然而,当前国内适宜于低温条件下使用的降失水剂,存在抗盐能力差的问题：而能在高温条件下使用的降失水剂,又会出现水泥浆在低温下候凝时间过长、高温下发生沉降等不利于提高固井质量的现象。为克服降失水剂存在的上述缺点,本文通过优化降失水剂分子链上的功能基团,优选出N,N-二甲基丙烯酰胺(DMAA)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、顺丁烯二酸酐(MA)和环状的N-乙烯基吡咯烷酮(NVP)等共聚单体；依据降失水剂控失水效果及其对水泥浆凝固时间影响,优化聚合条件与单体配比；得到了综合性能最佳的抗盐弱缓凝性降失水剂SRSTF。聚合物SRSTF的红外和核磁共振谱图分析证实四种单体均已成功聚合至降失水剂分子链上；热失重实验表明SRSTF聚合物的初始分解温度达277℃,表现出优异的热稳定性。对SRSTF降失水剂在水泥浆中的综合性能进行评价表明：降失水剂能够将淡水及半饱和盐水水泥浆的API失水量控制在100 mL以内,且在较宽的实验温度范围内其控失水性能显示出良好的稳定性；30℃下,降失水剂对水泥浆的凝固时间与水泥石的强度发展影响小；用SRSTF降失水剂配制的水泥浆稠化时间适宜、稠化曲线平稳、稳定性及流动性好；与其它油井水泥添加剂的配伍性好,可满足不同温度与不同盐浓度条件下的固井工艺要求,具有良好的实用性。
[Abstract]:The design and deployment of oil well cement slurry with excellent comprehensive performance is an important step to ensure the cementing quality in cementing engineering. The geological environment of oil and gas wells is becoming more and more complex, such as high temperature, frozen soil, leakage and salt paste formation. Therefore, the performance requirements of cement slurry are also improved. Under the condition of limited performance of cement, the performance of cement slurry is improved by adding additives such as water loss reducer and retarder to cement. However, at present, there is a problem of poor salt resistance of water loss reducing agent suitable for use at low temperature in China, and the water loss reducing agent which can be used at high temperature will cause cement slurry to wait too long at low temperature. Settlement at high temperature is not conducive to improving cementing quality. In order to overcome the above shortcomings of water loss reducer, N, N-dimethyl acrylamide (DMAA), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), was selected by optimizing the functional groups on the molecular chain of water loss reducer. Maleic anhydride (MA) and cyclic N-vinylpyrrolidone (NVP) were comonomers. According to the effect of water loss control agent and its effect on solidification time of cement slurry, the polymerization conditions and monomer ratio were optimized, and the salt resistant weak retarding agent SRSTF. with the best comprehensive properties was obtained. The infrared and nuclear magnetic resonance spectra of polymer SRSTF confirmed that the four monomers had been successfully polymerized into the molecular chain of water loss reducer, and the thermal weight loss test showed that the initial decomposition temperature of SRSTF polymer was 277鈩，
本文编号：2479274
[Abstract]:The design and deployment of oil well cement slurry with excellent comprehensive performance is an important step to ensure the cementing quality in cementing engineering. The geological environment of oil and gas wells is becoming more and more complex, such as high temperature, frozen soil, leakage and salt paste formation. Therefore, the performance requirements of cement slurry are also improved. Under the condition of limited performance of cement, the performance of cement slurry is improved by adding additives such as water loss reducer and retarder to cement. However, at present, there is a problem of poor salt resistance of water loss reducing agent suitable for use at low temperature in China, and the water loss reducing agent which can be used at high temperature will cause cement slurry to wait too long at low temperature. Settlement at high temperature is not conducive to improving cementing quality. In order to overcome the above shortcomings of water loss reducer, N, N-dimethyl acrylamide (DMAA), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), was selected by optimizing the functional groups on the molecular chain of water loss reducer. Maleic anhydride (MA) and cyclic N-vinylpyrrolidone (NVP) were comonomers. According to the effect of water loss control agent and its effect on solidification time of cement slurry, the polymerization conditions and monomer ratio were optimized, and the salt resistant weak retarding agent SRSTF. with the best comprehensive properties was obtained. The infrared and nuclear magnetic resonance spectra of polymer SRSTF confirmed that the four monomers had been successfully polymerized into the molecular chain of water loss reducer, and the thermal weight loss test showed that the initial decomposition temperature of SRSTF polymer was 277鈩，
本文编号：2479274
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