首页> 外文OA文献 >Pastas compósitas cimento/sílica/polímero para cimentação de poços de baixa profundidade sujeitas à injeção de vapor
【2h】

Pastas compósitas cimento/sílica/polímero para cimentação de poços de baixa profundidade sujeitas à injeção de vapor

机译:用于注入蒸汽的浅井固井用水泥/二氧化硅/聚合物复合浆料

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

The production of heavy oil fields, typical in the Northeastern region, is commonly stimulated by steam injection. High bottom hole temperatures are responsible not only for the development of deleterious stresses of the cement sheath but also for cement strength retrogression. To overcome this unfavorable scenario, polymeric admixtures can be added to cement slurries to improve its fracture energy and silica flour to prevent strength retrogression. Therefore, the objective of the present study was to investigate the effect of the addition of different concentrations of polyurethane (5-25%) to cement slurries containing 40% BWOC silica flour. The resulting slurries were characterized using standard API (American Petroleum Institute) laboratory tests. In addition to them, the mechanical properties of the slurries, including elastic modulus and microhardness were also evaluated. The results revealed that density, free water and stability of the composite cement/silica/polyurethane slurries were within acceptable limits. The rheological behavior of the slurries, including plastic viscosity, yield strength and gel strength increased with the addition of 10% BWOC polyurethane. The presence of polyurethane reduced the fluid loss of the slurries as well as their elastic modulus. Composite slurries also depicted longer setting times due to the presence of the polymer. As expected, both the mechanical strength and microhardness of the slurries decreased with the addition of polyurethane. However, at high bottom hole temperatures, the strength of the slurries containing silica and polyurethane was far superior than that of plain cement slurries. In summary, the use of polyurethane combined with silica is an interesting solution to better adequate the mechanical behavior of cement slurries to heavy oil fields subjected to steam injection
机译:东北地区典型的稠油油田的生产通常通过注入蒸汽来刺激。较高的井底温度不仅造成水泥护套有害应力的产生,而且还导致水泥强度的倒退。为了克服这种不利情况,可以将聚合物外加剂添加到水泥浆中以提高其断裂能,而硅粉则可以防止强度倒退。因此,本研究的目的是研究向含有40%BWOC硅粉的水泥浆中添加不同浓度的聚氨酯(5-25%)的影响。使用标准API(美国石油学会)实验室测试对所得浆液进行表征。除了它们之外,还评估了浆料的机械性能,包括弹性模量和显微硬度。结果表明,复合水泥/二氧化硅/聚氨酯浆料的密度,游离水和稳定性均在可接受的范围内。加入10%BWOC聚氨酯后,浆料的流变行为(包括塑性粘度,屈服强度和凝胶强度)增加。聚氨酯的存在降低了浆料的流体损失及其弹性模量。由于聚合物的存在,复合浆料还具有更长的凝固时间。如所预期的,随着聚氨酯的加入,浆料的机械强度和显微硬度均下降。然而,在高的底孔温度下,包含二氧化硅和聚氨酯的浆料的强度远远优于普通水泥浆料的强度。总之,将聚氨酯与二氧化硅结合使用是一种有趣的解决方案,可以更好地使水泥浆对注水的重油油田的机械性能具有足够的适应性

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号