当前位置: X-MOL 学术Energy Rep. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Impacts of natural fractures on acid fracture design: A modeling study
Energy Reports ( IF 4.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.egyr.2020.04.030
Murtada Saleh Aljawad , Mateus Palharini Schwalbert , Mohamed Mahmoud , Abdullah Sultan

Abstract Carbonate formations, which are usually naturally fractured, are good candidates for acid fracturing. Natural fractures have a significant impact on the execution and outcomes of acid fracture design. The interaction of hydraulics with natural fractures can be complex and is rarely considered in acid fracture modeling. This study provides an integrated approach where natural fractures are considered in both acid fracture and productivity modeling. The model is dynamic, integrating fracture propagation with reactive acid transport and coupled with heat transfer. The proposed acid fracture model generates fracture network permeability, which is then used in the productivity model. A parametric study was conducted to investigate the impact of natural fractures on the productivity of acid fractured wells. Multiple scenarios of different natural fracture spacings, lengths, and widths were investigated. It was determined that the existence of natural fractures negatively impacted productivity because they limited the extension of the hydraulic fracture. The impact was found to be more significant when the reservoir was tight, situations where a long hydraulic fracture is desirable. It was also found that the optimum acid injection rate increased with an increase in natural fracture intensity at moderate reservoir permeability levels. Nevertheless, the maximum injection rate should be targeted in tight formations, no matter the intensity of the natural fracture. Implementation of diversion stages could significantly improve the productivity of an acid fractured well.

中文翻译:

天然裂缝对酸性裂缝设计的影响:建模研究

摘要 碳酸盐岩地层通常是自然压裂的,是酸压裂的良好候选者。天然裂缝对酸性裂缝设计的执行和结果有重大影响。水力与天然裂缝的相互作用可能很复杂,在酸性裂缝建模中很少考虑。这项研究提供了一种综合方法,其中在酸压裂和产能建模中都考虑了天然裂缝。该模型是动态的,将裂缝扩展与反应性酸传输相结合,并与热传递相结合。提议的酸压裂模型生成裂缝网络渗透率,然后将其用于产能模型。进行了参数研究以研究天然裂缝对酸压裂井产能的影响。研究了不同天然裂缝间距、长度和宽度的多种情况。确定天然裂缝的存在对生产力产生负面影响,因为它们限制了水力裂缝的延伸。发现当储层很紧时,影响更显着,在需要长水力压裂的情况下。还发现,在中等油藏渗透率水平下,最佳酸注入速率随着天然裂缝强度的增加而增加。然而,无论天然裂缝的强度如何,都应在致密地层中以最大注入速率为目标。实施导流阶段可以显着提高酸压裂井的产能。确定天然裂缝的存在对生产力产生负面影响,因为它们限制了水力裂缝的延伸。发现当储层很紧时,影响更显着,在需要长水力压裂的情况下。还发现,在中等油藏渗透率水平下,最佳酸注入速率随着天然裂缝强度的增加而增加。然而,无论天然裂缝的强度如何,都应在致密地层中以最大注入速率为目标。实施导流阶段可以显着提高酸压裂井的产能。确定天然裂缝的存在对生产力产生负面影响,因为它们限制了水力裂缝的延伸。发现当储层很紧时,影响更显着,在需要长水力压裂的情况下。还发现,在中等油藏渗透率水平下,最佳酸注入速率随着天然裂缝强度的增加而增加。然而,无论天然裂缝的强度如何,都应在致密地层中以最大注入速率为目标。实施导流阶段可以显着提高酸压裂井的产能。发现当储层很紧时,影响更显着,在需要长水力压裂的情况下。还发现,在中等油藏渗透率水平下,最佳酸注入速率随着天然裂缝强度的增加而增加。然而,无论天然裂缝的强度如何,都应在致密地层中以最大注入速率为目标。实施导流阶段可以显着提高酸压裂井的产能。发现当储层很紧时,影响更显着,在需要长水力压裂的情况下。还发现,在中等油藏渗透率水平下,最佳酸注入速率随着天然裂缝强度的增加而增加。然而,无论天然裂缝的强度如何,都应在致密地层中以最大注入速率为目标。实施导流阶段可以显着提高酸压裂井的产能。无论天然裂缝的强度如何。实施导流阶段可以显着提高酸压裂井的产能。无论天然裂缝的强度如何。实施导流阶段可以显着提高酸压裂井的产能。
更新日期:2020-11-01
down
wechat
bug