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首页> 外文期刊>SPE journal >A Comprehensive Model of High-Rate Matrix-Acitl Stimulation for Long Horizontal Wells in Carbonate Reservoirs: Part I—Scaling Up Core-Level Acid Wormholing to Field Treatments
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A Comprehensive Model of High-Rate Matrix-Acitl Stimulation for Long Horizontal Wells in Carbonate Reservoirs: Part I—Scaling Up Core-Level Acid Wormholing to Field Treatments

机译：碳酸盐岩储层中长水平井的高速率基质-原子激励的综合模型：第一部分：将岩心级酸液渗透扩大到现场处理

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Matrix-acidizing models have traditionally underpredicted acid-stimulation benefits because of underprediction of wormhole penetration and the corresponding magnitude of completion-skin factors in vertical wells. For long horizontal wells drilled in carbonate reservoirs, productivity enhancement is a function of acid placement and effective wormhole penetration. However, prediction of wormhole penetration requires more effective analysis than that provided by current industry models. This paper presents results of matrix-acid modeling work for horizontal wells and describes a practical engineering tool for analyzing the progress of matrix-acid stimulation in carbonate reservoirs. The wormhole-growth model is based on the Buijse and Glasber-gen empirical correlation. Combining with the mechanistic model of the wormhole propagation based on acid transport and fluid loss from a single wormhole, a modified Buijse-Glasbergen wormhole-growth model is developed that relates the wormhole growth rate to the in-situ injection velocity at the tip of the dominant wormhole. The wormhole constitutive model developed in this study also accounts for core-size dependencies seen in laboratory acid-flood experiments. A semianalytical flow correlation is derived for estimating interstitial velocities at the tip of the dominant wormholes based on a number of 3D FEM simulation analyses, accounting for more realistic flow regimes (radial and spherical flow) typically observed in field application. The scaleup procedure developed in this study extends the wormhole geometry and penetration from laboratory flow tests on small cores to field-sized treatments. The scaleup procedure developed in this work can be applied to cemented and uncemented horizontal wells, including barefoot and perforation-cluster completions typically employed in carbonate reservoirs. Application of this modeling shows that acid wormholing through carbonate formations can provide significant stimulation, resulting in post-stimulation skins as low as -3.5 to -4.0 vs. previously predicted values in the -1.0 to -2.0 range.
机译：传统上，由于对孔洞渗透率的预测不足以及垂直井中相应的完井表皮因子幅度，基体酸化模型传统上低估了增酸效果。对于在碳酸盐岩储层中钻的长水平井而言，生产率的提高取决于酸的注入和有效的虫洞渗透。但是，对虫孔渗透的预测需要比当前行业模型提供的分析更有效的分析。本文介绍了水平井基质-酸模拟工作的结果，并介绍了一种实用的工程工具，用于分析碳酸盐岩储层中基质-酸增产过程。虫孔增长模型基于Buijse和Glasber-gen的经验相关性。结合基于单个虫洞的酸迁移和流体损失的虫洞传播机理模型，开发了一种改良的Buijse-Glasbergen虫洞-生长模型，该模型将虫洞的生长速率与钻头尖端的原位注入速度联系起来。占主导地位的虫洞。在这项研究中开发的虫洞本构模型也说明了在实验室酸驱实验中看到的岩心大小依赖性。基于许多3D FEM仿真分析，得出了半解析流动相关性，用于估计主要虫洞尖端的间隙速度，从而说明了通常在现场应用中观察到的更实际的流动状态（径向和球形流动）。在这项研究中开发的放大程序将虫孔的几何形状和渗透范围从小型岩心的实验室流量测试扩展到现场处理。在这项工作中开发的放大程序可以应用于固井和非固井水平井，包括通常在碳酸盐岩储层中使用的赤脚和射孔丛完井。该模型的应用表明，碳酸盐岩层中的酸虫蛀可提供显着的刺激作用，导致刺激后的皮肤低至-3.5至-4.0，而先前的预测值为-1.0至-2.0。

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