Experimental study and modeling permeability damage in porous media due to asphaltene deposition

Mousavi, Seyed Meysam; Jafari, Saeed; Schaffie, Mahin; Norouzi-Apourvari, Saeid

doi:10.1016/j.petrol.2020.107396

Cited by 11 publications

(4 citation statements)

References 36 publications

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“…The method of field test has many disadvantages, such as long period, high cost, and much limitation. However, the simulation of the actual working condition with different scales can simplify the experimental process and get similar experimental results [38][39][40]. Based on the design data of a tailing pond in Hunan Province of China, the physical experiment of dam stacking with a simulated vertical section was used to study the deposition rule of fine tailings in the process of dam building.…”

Section: Experimental Device and Methodmentioning

confidence: 99%

Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition

et al. 2021

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Nearly half of the tailings dams in China are in a state of high-security risks and overservice, and the safety of these tailings dams has always been a concern for relevant scholars. The seepage characteristics of tailings are one of the essential factors affecting the safety of tailings dam. Now, due to the improvement of mineral processing technology, there are many fine tailings dam; the study of the seepage characteristics of the tailings dam is no longer applicable. Fine-grained tailings form uneven deposition in these tailings dams, resulting in the permeability of tailings not conforming to the previous law. Therefore, it is of great significance to study the permeability of fine-grained tailings with uneven deposition. In this paper, the physical model of the simulated tailings dam is established to study the influence of the dry beach slope on the distribution and deposition law of fine tailings during discharge. The test results show that the average particle size of tailings decreases along the length of dry beach, showing the phenomenon of coarsening upstream and thinning downstream. Then, based on the data of fine tailings deposition, the variation characteristics of the permeability coefficient of layered tailings under stable and unstable seepage conditions are studied. The test results show that the variation process of tailings permeability coefficient can be divided into four stages: rapid compaction stage, slow compaction stage, failure stage, and stable stage. Under stable and unstable seepage conditions, the permeability coefficients of unstratified tailing sand are about 10% and 15% higher, respectively, than those in the initial state. The permeability coefficient of layered tailings formed by uneven settlement changes more obviously, which is about 12% and 20% higher than the initial state.

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Section: Experimental Device and Methodmentioning

confidence: 99%

Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition

et al. 2021

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“…The popular research methods consist of laboratory experiments and numerical simulations (Table , Table ). The primary influencing factors include the rock properties, injected pressure, injected flow rate, injected volume, temperature, salinity, reaction time, mineral composition, etc. − Research on asphaltene precipitation involves the evaluation of the change of crude oil composition, the generation and aggregation behavior of precipitation during CO 2 injection, and the variations in porosity and permeability. The dissolution-related study is focused on the types of soluble components in rock minerals and their content change, as well as the induced changes in pore throat structure and physical properties.…”

Section: Influence Of Various Factorsmentioning

confidence: 99%

A Minireview of the Influence of CO₂ Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

Gao

Xie²,

Cheng

et al. 2022

Energy Fuels

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The recoverable hydrocarbon reserves of conventional oil and gas resources are very limited in China. As important alternative resources, unconventional oil and gas have become a research hotspot. Though tight reservoirs have great potential to alleviate the increasing demand, issues during the development process, such as the rapid pressure depletion, fast decline in production, low productivity, and difficulties in water injection, are usually encountered due to poor physical properties like small pore throats and strong heterogeneity of the pore structure. The CO2 flooding technique could effectively replace crude oil from micro-nanopores, which is considered as a promising way to enhance the development performance of tight oil. However, precipitation and dissolution phenomena usually occur along with the CO2 injection process into reservoirs, affecting the pore structure evolution and oil displacement efficiency. In addition, artificial and natural fractures will even make this process more complicated. This paper presents the commonly used experimental approaches for CO2 injection into tight reservoirs and summarizes the main methods for investigating the influence of CO2 injection on the pore structure of reservoir rocks. Based on this, we highlighted that more attention should be paid to the influence of fractures and their dynamic changes on the evolution of pore structure during CO2 injection and the study of the solid–liquid interactions. To establish a method that could quantitatively evaluate the full-scale evolution of pore throats after CO2 injection is necessary. Meanwhile, the interaction strength of precipitation and dissolution and their effects on pore structure also remain open. Finally, a rigorous framework that could reveal the evolution mechanism and characterize the multiscale pore structure involving multiple influencing factors is urgently warranted.

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“…Tight sandstone gas reservoir has poor properties, small porosity, low permeability, strong heterogeneity and complex seepage mechanism, showing strong stress sensitivity during development (Wei et al, 2008;Sun et al, 2018). Reasonable system of well is an important factor affecting economic limit production and ultimate recovery of gas field (Mousavi et al, 2020;Sun et al, 2021). Different from oil reservoir, gas wells are generally depleted (Xu et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

Study on reasonable production allocation method of tight sandstone gas reservoir—A case of XX block in ordos basin

Lv¹,

Cui²,

Lei³

et al. 2023

Front. Energy Res.

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Reasonable production allocation of tight sandstone gas reservoirs is an important basis for efficient development of wells. Combining multiple mathematical models, the modified flowing material balance equation was established considering the variation of viscosity and compressibility, and a reasonable production allocation process was developed. The results show that: ① The flow material balance method ignores the change of compressibility, viscosity and deviation coefficient in the calculation. Compared with the results calculated by the material balance method, the results of the flow material balance method are smaller. ② A modified flowing material balance method is established, verified by the production of 670 wells in the study area during stable period. Compared with the open flow rate method, the error of dynamic reserve allocation method is smaller, with an error of 0.07%. ③ When dynamic reserves are used to allocate production, the initial decline rate of wells is reduced by 74.65% on average, the production on stable period increases by 21.28%, and the time increases by 1.79%. This study provides support for dynamic reserve calculation and reasonable production allocation of gas wells in the study area, and has important guiding significance for the formulation of reasonable development plan and economic and efficient development of tight sandstone gas reservoirs.

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Experimental study and modeling permeability damage in porous media due to asphaltene deposition

Cited by 11 publications

References 36 publications

Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition

Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition

A Minireview of the Influence of CO₂ Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

Study on reasonable production allocation method of tight sandstone gas reservoir—A case of XX block in ordos basin

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Experimental study and modeling permeability damage in porous media due to asphaltene deposition

Cited by 11 publications

References 36 publications

Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition

Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition

A Minireview of the Influence of CO2 Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

Study on reasonable production allocation method of tight sandstone gas reservoir—A case of XX block in ordos basin

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A Minireview of the Influence of CO₂ Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook