Characteristics of transient production rate performance of horizontal well in fractured tight gas reservoirs with stress-sensitivity effect

Li, Xiaoping; Cao, Lina; Luo, Cheng; Zhang, Bo; Zhang, Jiqiang; Tan, Xiaohua

doi:10.1016/j.petrol.2017.08.041

Cited by 42 publications

(24 citation statements)

References 20 publications

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“…The United States has been developing tight gas exploration technology since the late 1970s and has discovered more than 20 tight gas fields. In China, abundant tight gas is distributed in Sichuan basin and Ordos basin, and it is estimated that the tight gas production of China will reach 80 billion cubic meters by 2020 (Jia et al, 2012;Li et al, 2017). For China and the rest of the world, tight gas reservoirs have become an important alternative energy source for conventional oil and gas resources.…”

Section: Introductionmentioning

confidence: 99%

“…Kuchuk et al (2014) investigated rate-transient behavior of dual-porosity and discrete naturally fractured reservoirs using semi-analytical solutions. Li et al (2017) deduced a dual-porosity model for a horizontal well in tight gas reservoirs, the fluid exchange between matrix systems and fracture systems is considered to be a pseudo-steady state process.…”

Section: Introductionmentioning

confidence: 99%

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Performance of horizontal wells in composite tight gas reservoirs considering stress sensitivity

Zhao¹,

Du²

2019

Adv. Geo-Energ. Res.

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Tight gas reservoir (TGR) plays an important role in unconventional oil and gas resources. The existing seepage models for TGR rarely consider the effects of heterogeneity, stresssensitivity, and the unsteady fluid exchange between matrix and fracture. Heterogeneity is common for tight gas reservoir which should be carefully considered in geological model. The stress-sensitivity effect of fracture is an important factor influencing the transient flow behavior of TGR. Ultra-low porosity and permeability cause the unsteady flow between matrix and fractures systems. So this paper introduced a mathematical model for the horizontal well in a dual-porosity composite tight gas reservoir with considering the stress-sensitivity effect and unsteady flow between matrix and fractures systems. Some mathematical methods including the finite Fourier cosine transform, perturbation technique, Laplace transform, superposition principle, Stehfest numerical inversion algorithm are used to solve the nonlinear partial differential equation. Different flow regimes are divided based on pressure transient analysis curves. The sensitivity analysis of related parameters is studied according to pressure transient analysis and rate transient analysis curves. The presented model and obtained results in this paper give better understanding on pressure and rate transient behaviors of composite TGR.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of horizontal wells in composite tight gas reservoirs considering stress sensitivity

Zhao¹,

Du²

2019

Adv. Geo-Energ. Res.

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“…Both gas viscosity µ and total compressibility c t in Equation (3) are functions of pressure. In order to simplify the proposed model and obtain an analytical solution, many research papers [26,37,38] treat the values of µ and c t in Equation 3as constants, which could make the simulation results be accurate enough for engineering requirements. Following the suggestion by Wang [37], the values of µ and c t are evaluated at the initial condition, i.e., µ = µ(p i ) and c t = c t (p i ) in this paper.…”

Section: Flow Model For Stress-sensitive Gas Reservoirsmentioning

confidence: 99%

Transient-Flow Modeling of Vertical Fractured Wells with Multiple Hydraulic Fractures in Stress-Sensitive Gas Reservoirs

Guo

Sun

Peng³

et al. 2019

Applied Sciences

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Massive hydraulic fracturing of vertical wells has been extensively employed in the development of low-permeability gas reservoirs. The existence of multiple hydraulic fractures along a vertical well makes the pressure profile around the vertical well complex. This paper studies the pressure dependence of permeability to develop a seepage model of vertical fractured wells with multiple hydraulic fractures. Both transformed pseudo-pressure and perturbation techniques have been employed to linearize the proposed model. The superposition principle and a hybrid analytical-numerical method were used to obtain the bottom-hole pseudo-pressure solution. Type curves for pseudo-pressure are presented and identified. The effects of the relevant parameters (such as dimensionless permeability modulus, fracture conductivity coefficient, hydraulic-fracture length, angle between the two adjacent hydraulic fractures, the difference of the hydraulic-fracture lengths, and hydraulic-fracture number) on the type curve and the error caused by neglecting the stress sensitivity are discussed in detail. The proposed work can enrich the understanding of the influence of the stress sensitivity on the performance of a vertical fractured well with multiple hydraulic fractures and can be used to more accurately interpret and forecast the transient pressure.

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“…In general, the natural fracture has developed in tight gas reservoirs [5,6]. The natural fracture medium has the stress-sensitivity characteristic [5][6][7][8][9]. And along the extending direction, artificial fractures are mostly irregular [10,11] and the proppant distribution is uneven [12], so the artificial hydraulic fracture is variable conductivity.…”

Section: Introductionmentioning

confidence: 99%

Well Testing Model of Multiple Fractured Horizontal Well with Consideration of Stress-Sensitivity and Variable Conductivity in Tight Gas Reservoirs

Cui

Zhen

et al. 2018

Mathematical Problems in Engineering

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Multiple fractured horizontal wells have been widely used to develop unconventional tight gas reservoirs. Currently, many well testing models were established to study the performance of fractured horizontal wells in tight gas reservoirs. However, none of these models thoroughly takes stress-sensitivity of natural fractures and variable conductivity of artificial fractures into consideration. Based on the consideration of stress-sensitivity of natural fractures and variable conductivity of artificial fractures, a novel well testing model for fractured horizontal well in tight gas reservoirs is proposed. And the semianalytical solution of this new model is obtained by dividing the artificial fracture into different segments under the integrative methods of Laplace transformation, point source function, perturbation theory, superposition principle, and Stehfest numerical inversion. After validation, the semianalytical solution is consistent with that of Zerzar’s model (2004). Also, typical pressure and pressure derivative curves are plotted. According to typical curves, seven regimes can be derived, namely, bilinear flow, linear flow, early-time pseudoradial flow, biradial flow, intermediate-time pseudoradial flow, and pseudo-steady state interporosity flow, and late-time pseudoradial flow can be identified. In addition, this paper analyzes the impact on pressure and pressure derivative curves exerted by variable conductivity and stress-sensibility. The results show that variable conductivity mainly affects the early flow regimes, including bilinear flow, linear flow, and early-time radial flow, while the stress-sensitivity mainly affects the later flow regimes, including intermediate-time pseudoradial flow, pseudo-steady state interporosity flow, and late-time pseudoradial flow. The typical curves will ascend with the increasing of stress-sensitivity coefficient. The research provides a method for precise prediction of formation parameters and has a significant impact on the tight gas reservoir development.

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Characteristics of transient production rate performance of horizontal well in fractured tight gas reservoirs with stress-sensitivity effect

Cited by 42 publications

References 20 publications

Performance of horizontal wells in composite tight gas reservoirs considering stress sensitivity

Performance of horizontal wells in composite tight gas reservoirs considering stress sensitivity

Transient-Flow Modeling of Vertical Fractured Wells with Multiple Hydraulic Fractures in Stress-Sensitive Gas Reservoirs

Well Testing Model of Multiple Fractured Horizontal Well with Consideration of Stress-Sensitivity and Variable Conductivity in Tight Gas Reservoirs

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