Experimental Investigation of a Novel Nanosilica for Blocking Unwanted Water Production

M. Alabdrabalnabi, Ayman Almohsin, Jin Huang, M. Sherief
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Abstract

Nanotechnology is the design and application of engineered nanoparticles with one minimum dimension in the range of 1 to 100 nanometers. To achieve a specific target, innovative methods are highly required to overcome the challenges in the oil and gas industry, such as undesired water production. Herein, we present an advanced nanosilica, a new eco-friendly, cost-effective, and promising approach to control undesirable water production. The objective of this work is to evaluate our nanofluid system that can be used for water management in different water production mechanisms, including: high permeability streak, wormhole, and fractured reservoirs. A systematic evaluation of novel nanosilica/activator for water shut-off application requires an examination of the chemical properties before, during, and after gelation at given reservoir conditions. The placement of this water shut-off system is highly dependent on gelation time and viscosity. Therefore, we emphasized in this study on investigating these gelation kinetics by conducting extensive rheology experiments at varied temperatures and activator concentrations. We have looked into evaluating the optimum breaker for the gel as a contingency plan for improper placement. Measurements of the nanosilica fluid’s initial viscosity exhibited a low viscosity, less than 10 cP at normal temperature and pressure (NTP) conditions; this provides significant benefit for mixing at surface and pumping requirements for pilot testing. The nanosilica gelation time can be tailored by adjusting activator concentration to match field job design at a given temperature, which is more than 200°F. The gelation time revealed an exponential relationship with temperature and reversible proportionality. The nanosilica gel proved to be a thermally stable fluid system along with different activation ratios. For breaker tests, the gellant fluid showed complete breakdown at altered temperatures to mimic downhole conditions. Our lab observations conclude that nanosilica fluid is verified to be acceptable as a water shut-off system for field applications. This novel nanofluid system is a promising technology to control water production from oil wells. The system has low initial viscosity that can be injected in porous media without hindering the injectivity and getting at risk of fracking the sand. In case of inappropriate placement, the fluid can break down entirely using a non-damaging chemical breaker instead of using mechanical approaches that might damage the completion.
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新型纳米二氧化硅堵水的实验研究
纳米技术是工程纳米粒子的设计和应用,其最小尺寸在1到100纳米之间。为了实现特定的目标,需要创新的方法来克服石油和天然气行业的挑战,例如不期望的产水。在此,我们提出了一种先进的纳米二氧化硅,这是一种新的环保、经济、有前途的方法来控制不良的产水。这项工作的目的是评估我们的纳米流体系统可用于不同产水机制的水管理,包括:高渗透条纹、虫孔和裂缝性油藏。要对新型纳米二氧化硅/活化剂进行系统评价,需要在给定的油藏条件下,对凝胶化之前、过程中和之后的化学性质进行检查。堵水系统的位置高度依赖于胶凝时间和粘度。因此,我们在本研究中强调通过在不同温度和活化剂浓度下进行广泛的流变学实验来研究这些凝胶动力学。我们已经研究了评估凝胶的最佳破胶剂作为不适当放置的应急计划。纳米二氧化硅流体的初始粘度测量显示粘度较低,在常温常压条件下小于10 cP;这为地面混合和中试泵送要求提供了显著的好处。在给定温度(200°F以上)下,可以通过调整活化剂浓度来匹配现场作业设计,从而定制纳米二氧化硅凝胶化时间。胶凝时间与温度和可逆比例呈指数关系。在不同活化比下,纳米硅胶被证明是一种热稳定的流体体系。在破胶剂测试中,凝胶流体在模拟井下环境的改变温度下完全破裂。我们的实验室观察得出结论,纳米二氧化硅流体被证实可以作为现场应用的堵水系统。这种新型纳米流体系统是一种很有前途的油井产水控制技术。该系统具有较低的初始粘度,可以注入到多孔介质中,而不会影响注入能力,也不会产生压裂砂的风险。如果放置不当,可以使用无破坏性的化学破胶剂将流体完全分解,而不是使用可能损坏完井的机械方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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