• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ACS Omega >Plugging High-Permeability Zones of Oil Reservoirs by Microbially Mediated Calcium Carbonate Precipitation
【24h】

Plugging High-Permeability Zones of Oil Reservoirs by Microbially Mediated Calcium Carbonate Precipitation

机译：通过微生物介导的碳酸钙沉淀堵塞油藏的高渗透区

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Simple plugging of the high-permeability “thief zones” of oil reservoirs is the most plausible and also the most straightforwardly achievable approach to enhance sweep efficiency and oil recovery. Sporosarcina pasteurii is a representative microorganism with the ability to precipitate calcium carbonate (CaCO_(3)) via enzymatic hydrolysis of urea in the presence of calcium ions. Microbially induced calcium carbonate precipitation (MICP) can cement and seal the granular and fractured media and thus can be used as a potential microbial plugging agent for the high-permeability zones of oil reservoirs. The following investigated the microscopic characteristics of MICP plugging and its efficacy in permeability reduction. The columns of near-spherical silica sand and angular silica sand with three separate granularities (40/60, 60/80, and 80/120 mesh) were used as artificial rock cores representing distinct pore sizes and pore characteristics to investigate the efficacy and microprocess of MICP plugging with different biotreatment periods. The results indicated that permeability is reduced significantly after only short periods of biotreatment. After eight cycles of MICP treatments, the permeability for each type of cores dropped by 54–90% of individual initial permeabilities. The measured CaCO_(3) content indicated that the decreasing rate in permeability with the increasing CaCO_(3) content experiences three contrasting stages, namely, slow decline, speedy decline, and plateauing. X-ray diffraction indicated that most of the generated CaCO_(3) crystals occur as vaterite with only a small amount of calcite. Imaging by scanning electron microscopy further revealed the microprocess of MICP plugging. Microorganisms first concentrate on the pore wall to secrete CaCO_(3), forming a thin and large uniform layer of CaCO_(3). Then, some nucleation sites of CaCO_(3) crystals will experience further preferential growth, resulting in large, dominant crystals that act as a plugging agent within the pore space. Compared to extracellular polymeric substances, which are currently the primary microbial plugging agent used to enhance sweep efficiency of oil reservoirs, bio-CaCO_(3) appears more effective in plugging in terms of its morphology, size, and growth characteristics.
机译：简单的堵塞石油储存器的高渗透性“小偷区域”是最合理的，也是提高扫描效率和溢油的最直接可实现的方法。 Sporosarcina Pasteurii是一种代表性的微生物，其能够通过尿素水解钙离子存在尿素水解的能力沉淀碳酸钙（CaCO_（3））。微生物诱导的碳酸钙沉淀（MICP）可以水解和密封粒状和裂缝介质，因此可以用作油藏的高渗透区的潜在微生物堵塞剂。以下研究了MICP堵塞的显微特性及其渗透性降低的功效。用三个单独的粒度（40/60,60 / 80和80/120网格）用作近三个单独的粒度（40/60,60 / 80和80/120网）的柱子，作为观众的孔径和孔隙特性，以研究疗效和微处理用不同的生物处理时段的MICP堵塞。结果表明，在只有短时间的生物处理后，渗透性显着降低。经过八个循环的MICP治疗后，每种类型的核心渗透率均为54-90％的个体初始渗透率。测量的CaCO_（3）含量表明，随着CACO_（3）内容的增加，渗透率的降低率经历了三个对比阶段，即缓慢下降，快速下降和平台。 X射线衍射表明，大部分产生的CaCO_（3）晶体作为Vaterite，只有少量方解石。通过扫描电子显微镜进行成像进一步揭示了MICP堵塞的微处理。微生物首先浓缩在孔壁上分泌Caco_（3），形成薄且大的CaCO_（3）层。然后，CaCO_（3）晶体的一些成核位点将经历进一步的优先生长，导致具有充当孔隙空间内的堵塞剂的大型优势晶体。与目前用于增强扫液效率的初级微生物堵塞剂的细胞外聚合物物质相比，Bio-Caco_（3）在其形态，尺寸和生长特性方面堵塞堵塞。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

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