Research on the Depletion and Recovery Characteristics of Fault-Karst Reservoirs

Tang, Bochao; Geng, Chunying; Huang, Mina; Hai-tao, LU; Ren, Ke

doi:10.1155/2022/1105335

Cited by 5 publications

(5 citation statements)

References 25 publications

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“…The 80 and 120 mesh glass microspheres were filled into the model fracture mesh to create different simulated reservoir fracture environments. The fracture edge near the inlet and outlet of the model fluid was designed as a semicircle to reduce flow loss. − The fluid injection end of the model bottom plate was filled with glass microbeads. The filling range was bounded by the central axis of the long side of the fluid flow space in the model.…”

Section: Methodsmentioning

confidence: 99%

Study on Formation and Migration Law of Foam in Fractures and Its Influencing Factors

Li,

Feng,

Wang

et al. 2024

ACS Omega

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This study focuses on the characteristics of foam generation, flow, and plugging in different reservoir fracture environments. Through visual physical model experiments and stone core displacement experiments, we analyze the flow regeneration of foam in a simulated reservoir fracture environment as well as its sealing and sweeping mechanisms. The findings reveal that low permeability reservoirs, with their smaller and more intricate fracture structures, are conducive to the generation of high-strength foam. This is due to the stronger shear effect of these fracture structures on the injected surfactant and gas mixture system, resulting in a denser foam system. Consequently, low permeability reservoirs facilitate a series of mechanisms that enhance the fluid sweep efficiency. Furthermore, the experiments demonstrate that higher reservoir fracture roughness intensifies the shear disturbance effect on the injected fluid. This disturbance aids in foam regeneration, increases the flow resistance of the foam, and helps to plug high permeability channels. As a result, the foam optimizes the injection-production profile and improves the fluid sweep efficiency. Stone core displacement experiments further illustrate that during foam flooding, the foam liquid film encapsulates the gas phase, thereby obstructing fluid channeling through the Jamin effect. This forces the subsequently injected fluid into other low-permeability fractures, overcoming the shielding effect of high-permeability fractures on low-permeability fractures. Consequently, this improves the fluid diversion rate of low permeability fractures, effectively inhibiting fluid cross-flow and enhancing sweep efficiency. These experimental results highlight the advantages of foam flooding in the development of complex reservoirs with low permeability fracture structures, demonstrating its efficacy in inhibiting fluid cross-flow and optimizing the injection-production profile.

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Section: Methodsmentioning

confidence: 99%

Study on Formation and Migration Law of Foam in Fractures and Its Influencing Factors

Li,

Feng,

Wang

et al. 2024

ACS Omega

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“…The impact of the initial reservoir capacity was considered by ranging from 10% of the capacity to the full capacity. The reservoir simulation model was integrated with an optimization technique to search for the optimal rule curves [81][82][83]. Following the optimization process, the obtained rule curves were subjected to an assessment to evaluate the occurrences of water shortage and excess release.…”

Section: Initial Condition Of Reservoir Characteristicmentioning

confidence: 99%

Concern Condition for Applying Optimization Techniques with Reservoir Simulation Model for Searching Optimal Rule Curves

Sriworamas,

Prasanchum,

Ashrafi

et al. 2023

Water

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This paper presents a comprehensive review of optimization algorithms utilized in reservoir simulation-optimization models, specifically focusing on determining optimal rule curves. The study explores critical conditions essential for the optimization process, including inflow data, objective and smoothing functions, downstream water demand, initial reservoir characteristics, evaluation scenarios, and stop criteria. By examining these factors, the paper provides valuable insights into the effective application of optimization algorithms in reservoir operations. Furthermore, the paper discusses the application of popular optimization algorithms, namely the genetic algorithm (GA), particle swarm optimization (PSO), cuckoo search (CS), and tabu search (TS), highlighting how researchers can utilize them in their studies. The findings of this review indicate that identifying optimal conditions and considering future scenarios contribute to the derivation of optimal rule curves for anticipated situations. The implementation of these curves can significantly enhance reservoir management practices and facilitate the resolution of water resource challenges, such as floods and droughts.

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“…The D type water drive characteristic curve is derived from the relationship between the oil-water relative permeability ratio and water saturation, with the linear proportional coefficient inversely related to geological reserves [27,28]. The Blasingame method and the flow material balance method are used to study reservoir reserves under quasi-steady water invasion, proposing a method for dynamic reserves and water size evaluation based on the dynamic identification of water invasion [29][30][31][32][33]. A dynamic reserve calculation method for single-cavity and fracture-cavity reservoirs, considering formation water and fracture elastic energy, is established using the water injection indicator curve method and validated with production data from over 30 wells [34,35].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Reserve Calculation Method of Fractured-Vuggy Reservoir Based on Modified Comprehensive Compression Coefficient

He,

Chen,

Yuan

et al. 2024

Processes

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The low comprehensive compressibility coefficient characteristic of fracture-vuggy reservoirs often leads to imprecise dynamic reserve calculations. This study introduces a novel method for estimating dynamic reserves, which incorporates a modified comprehensive compressibility coefficient to enhance accuracy. This methodology has been applied to 23 wells in the Tahe Oilfield, resulting in error rates substantially lower than those associated with traditional techniques, thereby markedly enhancing the accuracy of dynamic reserve estimations. Specifically, for karst cave and fracture-vuggy reservoirs, the error rate in dynamic reserve calculations is reduced to under 10%, surpassing conventional methods by more than fivefold. In the case of fractured reservoirs, despite minor fluctuations in error rates due to stress sensitivity, diversion capacity, and channel variations, the proposed method still demonstrates a significant reduction in error rates compared to standard practices.

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Research on the Depletion and Recovery Characteristics of Fault-Karst Reservoirs

Cited by 5 publications

References 25 publications

Study on Formation and Migration Law of Foam in Fractures and Its Influencing Factors

Study on Formation and Migration Law of Foam in Fractures and Its Influencing Factors

Concern Condition for Applying Optimization Techniques with Reservoir Simulation Model for Searching Optimal Rule Curves

Dynamic Reserve Calculation Method of Fractured-Vuggy Reservoir Based on Modified Comprehensive Compression Coefficient

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