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首页> 外文期刊>Journal of natural gas science and engineering >Modeling acid leakoff during multistage alternate injection of pad and acid in acid fracturing
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Modeling acid leakoff during multistage alternate injection of pad and acid in acid fracturing

机译：模拟酸压裂过程中垫层和酸的多阶段交替注入过程中的酸泄漏

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摘要

As a technology to reduce acid leakoff in acid fracturing, multistage alternate injection of pad and acid has been successfully applied in oilfields for many years. However, this technology has not been systematically studied to date, and the reduction of acid leakoff has not been quantified. In this paper, we developed a model to simulate the leakoff behavior during the multistage alternate injection of pad and acid during acid fracturing. The model couples wormholing, invaded zone growth, multi-fluid distribution, and compression of the reservoir. Based on this model, we conducted extensive numerical simulations to investigate the leakoff behavior for multistage alternate injection of pad and acid. Two types of pad fluids, crosslinked gel and slick water, were studied. For crosslinked gel, which has a high viscosity and generates filter cake before the acid arrival, the multistage alternate injection of the pad and acid forms multiple high flow resistance zones and restrains the wormhole growth, resulting in a reduction of the acid leakoff. The optimum number of injection stages was optimized based on the model. For slick water, which has a low viscosity and does not form filter cake on the surface, the pad leakoff raises the pressure in the compressed zone, reducing the pressure drop for leakoff as well as subsequent acid leakoff. The optimum injection procedure was determined to be a single stage pad injection followed by the acid. This technology can reduce acid leakoff by up to 50% over the cases investigated in this work. This paper reveals the mechanism of acid leakoff reduction by multistage alternate injection of pad and acid and provides a method to optimize the injection procedure. (C) 2015 Elsevier B.V. All rights reserved.
机译：作为减少酸压裂中酸泄漏的技术，垫层和酸的多级交替注入已经在油田中成功应用了很多年。但是，迄今为止，尚未对该技术进行系统研究，并且尚未量化酸泄漏的减少量。在本文中，我们开发了一个模型来模拟酸压裂过程中垫层和酸的多阶段交替注入过程中的泄漏行为。该模型将虫洞，侵入带增长，多流体分布和储层压缩耦合在一起。基于此模型，我们进行了广泛的数值模拟，以研究垫和酸的多级交替注入的泄漏行为。研究了两种类型的垫液：交联凝胶和光滑水。对于具有高粘度并在酸到达之前产生滤饼的交联凝胶，垫和酸的多级交替注入形成多个高流动阻力区并抑制虫洞的生长，从而减少了酸泄漏。基于该模型优化了最佳注射阶段数。对于具有低粘度且不会在表面上形成滤饼的打滑水，垫泄漏会增加压缩区中的压力，从而减少泄漏的压降以及随后的酸泄漏。确定最佳喷射程序为单阶段垫式喷射，然后加酸。在这项工作中研究的案例中，该技术可以将酸泄漏减少多达50％。本文揭示了通过垫层和酸的多级交替注入减少酸泄漏的机理，并提供了一种优化注入程序的方法。 （C）2015 Elsevier B.V.保留所有权利。

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