State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China.
Shanghai Investigation, Design & Research Institute Co. Ltd, Shanghai, PR China.
PLoS One. 2021 Mar 4;16(3):e0247948. doi: 10.1371/journal.pone.0247948. eCollection 2021.
With the increasing demand for energy, fracturing technology is widely used in oilfield operations over the last decades. Typically, fracturing fluids contain various additives such as cross linkers, thickeners and proppants, and so forth, which makes it possess the properties of considerably complicated components and difficult processing procedure. There are still some difficult points needing to be explored and resolved in the hydroxypropyl guar gum (HPG) removal process, e.g., high viscosity and removal of macromolecular organic compounds. Our works provided a facile and economical HPG removal technology for fracturing fluids by designing a series of processes including gel-breaking, coagulation and precipitation according to the diffusion double layer theory. After this treatment process, the fracturing fluid can meet the requirements of reinjection, and the whole process was environment friendly without secondary pollution characteristics. In this work, the fracturing fluid were characterized by scanning electron microscopy (SEM), Energy dispersive X-ray (EDX), X-ray diffraction (XRD) and Fourier transformed infrared (FTIR) spectroscopy technologies, etc. Further, the micro-stabilization and destabilization mechanisms of HPG in fracturing fluid were carefully investigated. This study maybe opens up new perspective for HPG removal technologies, exhibiting a low cost and strong applicability in both fundamental research and practical applications.
随着能源需求的不断增加，压裂技术在过去几十年中在油田作业中得到了广泛应用。通常，压裂液中含有各种添加剂，如交联剂、增稠剂和支撑剂等，这使得它具有成分复杂、处理过程复杂的特点。在羟丙基胍胶（HPG）去除过程中，仍有一些难点需要探索和解决，例如高粘度和高分子有机化合物的去除。我们的工作根据扩散双电层理论，通过设计一系列包括胶凝、凝聚和沉淀的工艺，为压裂液提供了一种简便、经济的 HPG 去除技术。经过处理后，压裂液可以满足回注要求，整个过程环保无污染。在这项工作中，采用扫描电子显微镜（SEM）、能谱（EDX）、X 射线衍射（XRD）和傅里叶变换红外光谱（FTIR）等技术对压裂液进行了表征。此外，还仔细研究了 HPG 在压裂液中的微稳定和失稳机制。这项研究为 HPG 去除技术开辟了新的视角，在基础研究和实际应用中具有成本低、适用性强的特点。
