Optimization of reasonable production pressure drop of multi-stage fractured horizontal wells in tight oil reservoirs

Feng, Qihong; Jiang, Zhe; Wang, Sen; Zhang, Ge; Qin, Yong; Xu, Shiqian; Zhang, Wei

doi:10.1007/s13202-018-0586-5

Cited by 14 publications

(14 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the proposed models, fracture expansion is only one direction perpendicular to the minimum principal stress, while in this paper, a longitudinal profile (along the x-z plane) of the fracture opening profile was represented. Feng et al [40] investigated a multi-stage fractured horizontal well as a numerical model to calculate fracture pressure drop by the consideration of dynamic fracture closure, matrix permeability change, and threshold pressure gradient for one well that is in accordance of the result in this section [40]. However, in this paper, it was modeled for two different layers that would be expandable for more layers.…”

Section: Discussionmentioning

confidence: 68%

RETRACTED: Application of Symmetry Law in Numerical Modeling of Hydraulic Fracturing by Finite Element Method

Sun

Zhou

Lu³

et al. 2020

Symmetry

View full text Add to dashboard Cite

In this paper, influential parameters on the hydraulic fracturing processes in porous media were investigated. Besides, the simultaneous stimulation of solids, fluids and fractures geomechanical equations were numerically analyzed as a developed 3D model. To do this, the Abacus software was used as a multi-objective program to solve the physical-mechanical symmetry law governing equations, according to the finite element method. Two different layers, A (3104–2984 m) and B (4216–4326 m), are considered in the model. According to the result of this study, the maximum fracture opening length in the connection of the wall surface is 10 and 9 mm for layer B and layer A, respectively. Moreover, the internal fracture fluid pressure for layer B and layer A is 65 and 53 Mpa. It is indicated that fracture fluid pressure reduced with the increase in fracture propagation length. Consequently, the results of this study would be of benefit for petroleum industries to consider several crucial geomechanical characteristics in hydraulic fractures simultaneously as a developed numerical model for different formation layers to compare a comprehensive analysis between each layer.

show abstract

Section: Discussionmentioning

confidence: 68%

RETRACTED: Application of Symmetry Law in Numerical Modeling of Hydraulic Fracturing by Finite Element Method

Sun

Zhou

Lu³

et al. 2020

Symmetry

View full text Add to dashboard Cite

show abstract

“…Thus, in order to study the effect of dynamic change of TPG on production performance in shale oil, an oil–water two-phase flow model is established to precisely predict the productivity and distribution of pressure and saturation in the near-well zone. In essential, the mass conservation equations of matrix and fracture systems in shale oil reservoirs are , ∂ false( ϕ ρ ψ S ψ false) M ∂ t = − ∇ · v⃗ ψ M + q ψ W + q ψ MF and ∂ false( ϕ ρ ψ S ψ false) F ∂ t = − ∇ · v⃗ ψ F + q ψ W + q ψ MF where superscript “M” means matrix system, superscript “F” means fracture system, subscript “ψ” means oil phase and water phase, ρ ψ is the phase density, S ψ is the phase saturation, q ψ normalW is the source-sink term, and q ψ MF …”

Section: Methodsmentioning

confidence: 99%

“…When the pressure drop gradient of fluid flow is less than TPG, the fluid cannot flow, and the fluid velocity is almost zero . Only when the pressure drop gradient increases to TPG will the fluid gradually begin to flow. − , Therefore, TPG is a key parameter to evaluate the productivity and potential of tight reservoirs. , Studying the TPG of tight reservoirs can help better understand the migration and characteristics of oil and water in a tight porous medium, which is crucial for the development and utilization of shale oil.…”

Section: Introductionmentioning

confidence: 99%

“…To study the impact of TPG on well performance, some scholars proposed tight oil production model with taking TPG into account. ,,, However, to the best of our knowledge, in these production models, ,,,− the TPG values are either fixed parameters or from empirical correlations. Thus, these models cannot reveal the influence of microstructure parameters on the well production in shale oil reservoirs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Threshold Pressure Gradient Model and Its Influence on Production Simulation for Shale Oil Reservoirs

Qu,

Tang,

Lei

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

Accurate characterization of the threshold pressure gradient (TPG) in shale oil reservoirs is essential for oil production. However, oil−water two-phase flow through shale oil reservoirs with narrow pores involves thermal−hydrological−mechanical coupling, and the relationship between TPG and pore structures under multiple mechanisms has not been adequately modeled mathematically. In this paper, an analytical TPG model of shale oil reservoirs is derived first by considering the combined effects of effective stress, temperature, capillary pressure, pore structures, and boundary layer. After the established model is adequately verified by the obtainable experimental data, it is embedded into a multistage fractured horizontal well productivity model to investigate the influence of relevant parameters on shale oil production. The simulation results suggest that the TPG for the oil phase increases with the increase in effective stress, leading to the decrease in shale oil production. The cumulative oil production with dynamic TPG is much greater than that considering fixed TPG. Moreover, the wettability of the oil−water two phase (e.g., oil−water interfacial tension and equilibrium contact angle) has crucial influences on well performance; thus, changing the wettability of the oil−water two phase by chemical injection is an effective method to enhance oil recovery. The research results can provide technical support for the efficient development of shale oil reservoirs from the perspective of pore-scale two-phase nonlinear flow characteristics and macroscopic productivity evaluation.

show abstract

“…With the development of fracturing technique and device, multistaged fracturing in the roof of outburst coal seam is applied to more and more outburst coal mines for methane predrainage [14][15][16]. Multistaged fracturing in the roof of outburst coal seam aims to create multiple fractures in the roof, which can traverse the coalrock interface for building migration channel for methane drainage [17]. erefore, the research emphasis on mechanism of permeability enhancement by multistaged fracturing in the roof of outburst coal seam mainly focuses on whether the multiple fractures in the roof can form and then traverse the coal-rock interface [18].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study and Numerical Simulation Research on the Effect of Coal‐Rock Interface on Multistaged Fracturing in the Roof of Outburst Coal Seam

Zhai

Tang

2021

Shock and Vibration

View full text Add to dashboard Cite

Multistaged fracturing in the roof of outburst coal seam is an efficient and creative technology for coalbed methane (CBM) drainage, which can effectively improve the permeability of coal seam. To reveal its mechanism of permeability enhancement, the effect of coal-rock interface on multistaged fracturing in the roof of outburst coal seam was simulated and discussed in this paper. Firstly, the lithological difference between outburst coal seam and roof was compared, and the concept and significance of multistaged fracturing in the roof of outburst coal seam were explained. Then, the mechanical conditions of multiple fractures in the roof traversing coal-rock interface were analyzed. The effects of mechanical parameters on multiple fractures were numerically simulated. The results indicated that fracturing borehole in adjacent rocks of outburst coal seam is much easier to drill and maintain gas drainage. Considering gas drainage efficiency and avoiding being blocked by coal fines, multistaged fracturing borehole is generally drilled in the stable rock stratum of roof. Whether the multiple fractures in the roof can traverse coal-rock interface is related to mechanical parameters of coal and rock, friction factor of coal-rock interface, angle between horizontal profile and coal-rock interface, cementing strength of coal-rock interface, minimum horizontal stress, and other factors. Higher fracturing fluid pressure contributes to propagating from the reservoir with low elastic modulus to the one with high elastic modulus for hydraulic fracture. Hydraulic fracture is more likely to propagate in the rock stratum with high brittleness index. The research results can improve multistaged fracturing theory and provide technological support for field test.

show abstract

Optimization of reasonable production pressure drop of multi-stage fractured horizontal wells in tight oil reservoirs

Cited by 14 publications

References 18 publications

RETRACTED: Application of Symmetry Law in Numerical Modeling of Hydraulic Fracturing by Finite Element Method

RETRACTED: Application of Symmetry Law in Numerical Modeling of Hydraulic Fracturing by Finite Element Method

A Novel Threshold Pressure Gradient Model and Its Influence on Production Simulation for Shale Oil Reservoirs

Theoretical Study and Numerical Simulation Research on the Effect of Coal‐Rock Interface on Multistaged Fracturing in the Roof of Outburst Coal Seam

Contact Info

Product

Resources

About