Overcoming Open Hole Multistage Acid Fracturing Challenges in Saudi Arabian Carbonate Reservoirs with Swellable Packers, Best Practices and Dynamic Evaluation

2016 ◽  
Author(s):  
Ataur R. Malik ◽  
Jairo A. Leal ◽  
Mohammed A. Asiri ◽  
Tolulope M. Ogundare ◽  
Eduardo Soriano ◽  
...  
Keyword(s):  
Best Practices ◽  
Saudi Arabian ◽  
Carbonate Reservoirs ◽  
Dynamic Evaluation ◽  
Acid Fracturing ◽  
Open Hole

Application of Mean Square Deviation Method to the Target Selection of Acid Fracturing for Fissure-Cavern Carbonate Reservoirs

2015 ◽  
Vol 1092-1093 ◽  
pp. 1356-1360
Author(s):  
Ya Hong Wu ◽  
Li Wang ◽  
Hao Qing Fang ◽  
Xi Shan Tian ◽  
Qiang Bo Mi ◽  
...  
Keyword(s):  
Neural Network ◽  
Bp Neural Network ◽  
Target Selection ◽  
Carbonate Reservoirs ◽  
Physical Parameters ◽  
Mean Square ◽  
Mean Square Deviation ◽  
Acid Fracturing ◽  
Open Hole ◽  
Deviation Method

The Ordovician fissure-cavern carbonate reservoirs of Tarim Basin have relatively large production thickness, long completion intervals and serious heterogeneity problems, former studies about physical parameters for fractured intervals of acid fracturing cannot be well presented through mean algorithm method. This paper uses mean square deviation method to acquire the values of the main influencing factors of acid fracturing, then optimizes the physical characteristics of the fractured intervals. The BP neural network simulation has been adopted to get the optimal BP neural network structure model. In Tarim, this study has simulated 20 wells before acid fracturing using the decision software which compiled by the optimum neural network construction. Comparative analysis has been made through application examples, the coincident rate of mean algorithm is 75%, compared with the 90% of mean square deviation method. Therefore, during the target selection for acid fracturing of heterogeneous carbonate reservoirs with long open hole intervals, it’s significant to use mean square deviation method to optimize physical parameters of reservoirs.

Case Studies and Best Practices for Installation of Open Hole Multistage Completion Systems in Wells Drilled Underbalanced

2014 ◽  
Author(s):  
John Bonar ◽  
D.J. Snyder ◽  
Brittany Dale Miller ◽  
Lonnie Jeffers
Keyword(s):  
Best Practices ◽  
Case Studies ◽  
Open Hole

Acid Fracturing Depleted Carbonates Improving Very Low Reservoir Quality Inside Slim Horizontal Open Hole (Russian)

2018 ◽  
Author(s):  
Amr Abd El Baky ◽  
Nawaf Al-Shuaibi ◽  
Alaa Eldine Alboueshi ◽  
Mohamed Elmofti ◽  
Ebrahim Elafify ◽  
...  
Keyword(s):  
Reservoir Quality ◽  
Acid Fracturing ◽  
Open Hole

scholarly journals Analysis of Flow Behavior for Acid Fracturing Wells in Fractured-Vuggy Carbonate Reservoirs

2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Mingxian Wang ◽  
Zifei Fan ◽  
Xuyang Dong ◽  
Heng Song ◽  
Wenqi Zhao ◽  
...  
Keyword(s):  
Composite System ◽  
Numerical Solutions ◽  
Transient Flow ◽  
Flow Behavior ◽  
Outer Region ◽  
Carbonate Reservoirs ◽  
Single Fracture ◽  
Specific Flow ◽  
Type Curves ◽  
Acid Fracturing

This study develops a mathematical model for transient flow analysis of acid fracturing wells in fractured-vuggy carbonate reservoirs. This model considers a composite system with the inner region containing finite number of artificial fractures and wormholes and the outer region showing a triple-porosity medium. Both analytical and numerical solutions are derived in this work, and the comparison between two solutions verifies the model accurately. Flow behavior is analyzed thoroughly by examining the standard log-log type curves. Flow in this composite system can be divided into six or eight main flow regimes comprehensively. Three or two characteristic V-shaped segments can be observed on pressure derivative curves. Each V-shaped segment corresponds to a specific flow regime. One or two of the V-shaped segments may be absent in particular cases. Effects of interregional diffusivity ratio and interregional conductivity ratio on transient responses are strong in the early-flow period. The shape and position of type curves are also influenced by interporosity coefficients, storativity ratios, and reservoir radius significantly. Finally, we show the differences between our model and the similar model with single fracture or without acid fracturing and further investigate the pseudo-skin factor caused by acid fracturing.

Study on Acid Fracturing Technology for Carbonate Reservoirs in Ordos Basin

2021 ◽  
Author(s):  
Lufeng Zhang ◽  
Jianye Mou ◽  
Shicheng Zhang ◽  
Mu Li ◽  
Minghui Li
Keyword(s):  
Ordos Basin ◽  
Carbonate Reservoirs ◽  
Acid Fracturing

Modeling Acid Fracturing Treatments with Multi-Stage Alternating Injection of Pad and Acid Fluids

2021 ◽  
Author(s):  
Rencheng Dong ◽  
Mary F. Wheeler ◽  
Hang Su ◽  
Kang Ma
Keyword(s):  
Viscous Fingering ◽  
High Viscosity ◽  
Carbonate Reservoirs ◽  
Acid Etching ◽  
Fracture Geometry ◽  
Fracture Conductivity ◽  
Acid Fracturing ◽  
Fracture Surfaces ◽  
Low Viscosity ◽  
Multi Stage

Abstract Acid fracturing technique is widely applied to stimulate the productivity of carbonate reservoirs. The acid-fracture conductivity is created by non-uniform acid etching on fracture surfaces. Heterogeneous mineral distribution of carbonate reservoirs can lead to non-uniform acid etching during acid fracturing treatments. In addition, the non-uniform acid etching can be enhanced by the viscous fingering mechanism. For low-perm carbonate reservoirs, by multi-stage alternating injection of a low-viscosity acid and a high-viscosity polymer pad fluid during acid fracturing, the acid tends to form viscous fingers and etch fracture surfaces non-uniformly. To accurately predict the acid-fracture conductivity, this paper developed a 3D acid fracturing model to compute the rough acid fracture geometry induced by multi-stage alternating injection of pad and acid fluids. Based on the developed numerical simulator, we investigated the effects of viscous fingering, perforation design and stage period on the acid etching process. Compared with single-stage acid injection, multi-stage alternating injection of pad and acid fluids leads to narrower and longer acid-etched channels.

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