A New Leakoff Analysis Approach for Acid Fracturing in Naturally Fractured Carbonate Gas Reservoirs

2019 ◽  
Vol 37 (1) ◽  
pp. 139-147
Author(s):  
Linjing Xu ◽  
Guoyong Wang ◽  
Tianyu Liu ◽  
Naizhen Liu ◽  
Shicheng Zhang ◽  
...  
Keyword(s):  
Analysis Approach ◽  
Gas Reservoirs ◽  
Acid Fracturing ◽  
Naturally Fractured ◽  
Fractured Carbonate

Acid Leakoff Mechanism in Acid Fracturing of Naturally Fractured Carbonate Gas Reservoirs

2013 ◽  
Vol 868 ◽  
pp. 682-685 ◽  
Author(s):  
Lin Jing Xu ◽  
Shi Cheng Zhang ◽  
Jian Ye Mou
Keyword(s):  
Fluid Loss ◽  
Natural Fractures ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
Acid Rock ◽  
Acid Fracturing ◽  
Naturally Fractured ◽  
Fractured Carbonate ◽  
Acid Leakoff ◽  
Fractured Carbonates

In acid fracturing, excessive acid leakoff is thought to be the main reason that limits fracture propagation and live acid penetration distance, so its very important to do research about acid leak-off on naturally fractured carbonates. we developed a new model in this paper to simulate acid leakoff into a naturally fractured carbonates gas reservoir during acid fracturing. Our model incorporates the acid-rock reaction on the fractured surfaces. Given the information of the Puguang gas reservoir, the model predicts acid filtration and leakoff rate over time. In this study, we found that acid leak-off mechanism in naturally fractured carbonates is much different from that in reservoirs without natural fractures. The leakoff volume is several times of nonreactive acid. Since the acid widened natural fractures, leakoff velocity increase with time firstly , then decrease. While the leakoff velocity of the nonreactive fluid decrease sustained. We also analyze other sensitivity parameters of the acid leakoff. In this model, we explain the acid leakoff mechanism in naturally fractured carbonates, and provide a more accurate calculating of fluid loss.

scholarly journals Acid Fracturing Optimizing Design and Application in Deep Naturally Fractured Carbonate

2021 ◽  
Vol 687 (1) ◽  
pp. 012114
Author(s):  
Mingguang Che ◽  
Yonghui Wang ◽  
Jianxin Peng ◽  
Changlin Zhou ◽  
Kai Dong
Keyword(s):  
Acid Fracturing ◽  
Naturally Fractured ◽  
Fractured Carbonate ◽  
Optimizing Design ◽  
Design And Application

Acid Fracturing Productivity Model for Naturally Fractured Carbonate Reservoirs

2018 ◽  
Author(s):  
Assiya Ugursal ◽  
Mateus Palharini Schwalbert ◽  
Ding Zhu ◽  
Alfred Daniel Hill
Keyword(s):  
Carbonate Reservoirs ◽  
Acid Fracturing ◽  
Naturally Fractured ◽  
Fractured Carbonate

scholarly journals A numerical investigation on the performance of hydraulic fracturing in naturally fractured gas reservoirs based on stimulated rock volume

2020 ◽  
Vol 10 (8) ◽  
pp. 3333-3345
Author(s):  
Ali Al-Rubaie ◽  
Hisham Khaled Ben Mahmud
Keyword(s):  
Hydraulic Fracturing ◽  
Hydraulic Fracture ◽  
Natural Fracture ◽  
Shear Stresses ◽  
Individual Element ◽  
Natural Fractures ◽  
Gas Reservoirs ◽  
Stimulated Reservoir Volume ◽  
Reservoir Volume ◽  
Naturally Fractured

Abstract All reservoirs are fractured to some degree. Depending on the density, dimension, orientation and the cementation of natural fractures and the location where the hydraulic fracturing is done, preexisting natural fractures can impact hydraulic fracture propagation and the associated flow capacity. Understanding the interactions between hydraulic fracture and natural fractures is crucial in estimating fracture complexity, stimulated reservoir volume, drained reservoir volume and completion efficiency. However, because of the presence of natural fractures with diffuse penetration and different orientations, the operation is complicated in naturally fractured gas reservoirs. For this purpose, two numerical methods are proposed for simulating the hydraulic fracture in a naturally fractured gas reservoir. However, what hydraulic fracture looks like in the subsurface, especially in unconventional reservoirs, remain elusive, and many times, field observations contradict our common beliefs. In this study, the hydraulic fracture model is considered in terms of the state of tensions, on the interaction between the hydraulic fracture and the natural fracture (45°), and the effect of length and height of hydraulic fracture developed and how to distribute induced stress around the well. In order to determine the direction in which the hydraulic fracture is formed strikethrough, the finite difference method and the individual element for numerical solution are used and simulated. The results indicate that the optimum hydraulic fracture time was when the hydraulic fracture is able to connect natural fractures with large streams and connected to the well, and there is a fundamental difference between the tensile and shear opening. The analysis indicates that the growing hydraulic fracture, the tensile and shear stresses applied to the natural fracture.

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