Pseudo-steady state analysis in fractured tight oil reservoirs

Ezulike, Obinna; Ghanbari, Ebrahim; Siddiqui, Shahab Kafeel; Dehghanpour, Hassan

doi:10.1016/j.petrol.2015.01.009

Cited by 12 publications

(2 citation statements)

References 30 publications

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“…Unconventional reservoirs, including tight oil, shale gas, and tight gas are key to meeting the increasing demand for hydrocarbon fuels in the world 1,2 . Tight oil reservoirs have recently become a hotspot for development in unconventional oil and gas resources 3,4 .…”

Section: Introductionmentioning

confidence: 99%

Simulation of tight fluid flow with the consideration of capillarity and stress-change effect

Zhang

Liu

et al. 2019

Sci Rep

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The horizontal wells and multi-stage hydraulic fracturing technologies play a significantly important role in developing unconventional reservoirs. Due to the nanopore effects and stress deformation in tight formations, the fluid equilibrium and thermodynamics become more complex and the conventional reservoir simulation models cannot accurately handle these mechanisms. Hence, the objective of this work is to propose a comprehensive simulation model considering the effects of confined space and stress-dependent deformation. We first evaluated the phase envelope and fluid properties in the confined nanopores. Results show that bubble-point pressure and oil viscosity decrease, while formation volume factor and gas-oil ratio increase. The heavy components cause large deviation on the P-T phase envelope at the reservoir condition. Subsequently, a reservoir simulation model of the Bakken tight oil reservoir was built including the effect of stress-dependent deformation. The proposed phase behavior model was applied into the reservoir simulator to predict the hydrocarbon production from the Bakken tight oil reservoir. Finally, the role of the confined space and the stress-dependent deformation on the production are examined in detail. This novel simulation approach can shed light on the better understanding of the key parameters affecting well production of in developing tight oil reservoirs in the future.

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Section: Introductionmentioning

confidence: 99%

Simulation of tight fluid flow with the consideration of capillarity and stress-change effect

Zhang

Liu

et al. 2019

Sci Rep

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“…e tight oil, signi cant hydrocarbon resources, has recently become a hot topic for exploration and development following shale gas [1]. Tight oil reservoirs are characterized by ultralow permeability, which obstructs hydrocarbons ow to wellbores without stimulation [2].…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Oil Occurrence and Long-Distance Transportation due to Injected Fluid in Tight Oil Reservoirs

Liu

Yang

Gao

et al. 2019

Advances in Polymer Technology

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In tight oil reservoirs, the injected fluid needs to travel a long distance to expel oil from the micro/nano-size pores to natural fractures or man-made fractures. The flow characteristics of injected fluid are not known well due to the long distance displacement and complex pore structure. In this study, the tight reservoir samples are from typical tight oilfield of China and the oil distribution characteristics are studied based on mineral composition, physical properties and pore size distribution. The long core displacement experiment is conducted based on injection of water, N2, and CO2, which aims to study the individual flooding feasibility. The results show that the oil mainly distributes in the form of spots and accumulates in the micro/nano-pores. Both oil spots and clay minerals have associated characteristics. The microfractures are not the storage space for oil spots, but can connect the oil spots to improve the mobility of the crude oil. In addition, the oil can achieve long distance migration under the injection of water, N2, and CO2, which presents different pressure distribution characteristics. The reservoir pressure of water flooding decreases first and increases later with displacement time. The reservoir pressure of N2 flooding rises gradually over displacement time. The reservoir pressure of CO2 flooding increases first and decreases over displacement time. In contrast to water flooding, N2, and CO2 can increase the reservoir energy, which contributes to tight oil production. In comparison, CO2 has better performances than N2 in terms of oil displacement efficiency. The study contributes to understanding the oil distribution characteristics and provides the guidance for field trials using different flooding techniques.

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A Comprehensive Model to Evaluate Hydraulic Fracture Spacing Coupling with Fluid Transport and Stress Shadow in Tight Oil Reservoirs

Zhao

Liu

et al. 2022

Transp Porous Med

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Pseudo-steady state analysis in fractured tight oil reservoirs

Cited by 12 publications

References 30 publications

Simulation of tight fluid flow with the consideration of capillarity and stress-change effect

Simulation of tight fluid flow with the consideration of capillarity and stress-change effect

The Characteristics of Oil Occurrence and Long-Distance Transportation due to Injected Fluid in Tight Oil Reservoirs

A Comprehensive Model to Evaluate Hydraulic Fracture Spacing Coupling with Fluid Transport and Stress Shadow in Tight Oil Reservoirs

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