Blasingame decline type curves with material balance pseudo-time modified for multi-fractured horizontal wells in shale gas reservoirs

Wei, Mingqiang; Duan, Yonggang; Dong, Mingzhe; Fang, Quantang

doi:10.1016/j.jngse.2016.03.033

Cited by 37 publications

(13 citation statements)

References 41 publications

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“…A pseudo-steady state may occur during the boundary dominated flow period, which is at the late stage of gas exploitation (Wang & Economides 2009;MoradiDowlatabad & Jamiolahmady 2017). Recently, this flow type has been applied to the production prediction of multi-fractured horizontal wells, which is essential for shale gas exploitation (Guo, Wang & Zhang 2016;Wei et al 2016;MoradiDowlatabad & Jamiolahmady 2017). Pseudo-steady state assumes that the pressure drops at a constant rate at every point of the field, and there is no flux at the drainage boundary (Ahmed & McKinney 2005;Wang & Economides 2009).…”

Section: Appendixmentioning

confidence: 99%

Coupling of high Knudsen number and non-ideal gas effects in microporous media

Wang

Chen

2018

J. Fluid Mech.

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High Knudsen number non-ideal gas flows in porous media are important and fundamental in various applications including shale gas exploitation and carbon dioxide sequestration. Because of the small pore size in tight rocks, the Knudsen number (Kn) may be high (i.e. much higher than 0.01) even though the gas is really dense. In fact, due to the high pressure and temperature underground, the gas usually manifests a strong non-ideal gas effect. Understanding the coupling mechanism of the high Kn effect and non-ideal gas effect is a premise to accurately model deep-seated underground gas exploitation or carbon dioxide sequestration. In this work, we theoretically analyse the high Kn non-ideal gas flows in microporous media. Based on the relative importance of the non-ideal gas effect and high Kn effect, the coupling is divided into four types. The analysis is subsequently validated by multiscale numerical simulations, in which the four types of coupling are clearly demonstrated. After applying the analysis to laboratory measurements, we propose a characteristic pressure model to calculate the gas permeability of tight rocks with better precision. The new model incorporates the non-ideal gas effect with the high Kn effect accurately and better bridges the laboratory measurements with the reservoir engineering.

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Section: Appendixmentioning

confidence: 99%

Coupling of high Knudsen number and non-ideal gas effects in microporous media

Wang

Chen

2018

J. Fluid Mech.

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“…Based on Ambastha's model, an analytical solution for a three-zone laterally composite reservoir model [26] was found in the Laplace-Fourier space, and Kuchuk and Tarek [27] extended this model to multizone case, explaining the changes in porosity, permeability, and compressibility. Based on the material balance equation and considering the nonlinearity caused by gas desorption and diffusion, and the complex flow of MFHW, Wei et al [28,29] developed a numerical method for multifractured horizontal wells in shale gas reservoirs. Medeiros et al [21] presented a semianalytical model for the pressure-transient analysis of horizontal wells in linear composite reservoirs and provided the detailed solutions for a two-zone, laterally composite reservoir.…”

Section: Introductionmentioning

confidence: 99%

Pressure Transient Analysis for a Horizontal Well in Heterogeneous Carbonate Reservoirs Using a Linear Composite Model

Duan

Ren

Fang

et al. 2020

Mathematical Problems in Engineering

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Carbonate reservoirs usually have strong anisotropy. Oil and gas recovery from fractured reservoirs is highly challenging due to complicated mechanisms involved in production from these reservoirs. A horizontal well completed in these reservoirs may extend through multiple zones, including homogeneous, dual-porosity, and triple-porosity formations. Traditional well test models assume that the entire length of a horizontal or multilateral well remains in the same formation with uniform properties. A well test model for pressure transient analysis of horizontal wells extending through a carbonate reservoir consisting of natural fractures, rock matrix, and vugs with different properties is presented in this study. e focus of this study is on dual-porosity (fracture-matrix) and triple-porosity (fracture-matrix-vug) reservoirs, considering the pseudosteady interporosity flows from rock matrix and vugs into fractures. A multizone triple-porosity model was established and solved by using the point source function, Green's function, and coupling of multiple reservoir sections. e corresponding type curves were developed, and sensitivity analysis was carried out. e type curves of flow stage division reveal that a horizontal well traversing a three-section reservoir including homogeneous, dual-porosity (fracture-matrix)/triple-porosity (fracture-vug-matrix), and homogeneous sections identifies the stages of pseudosteady interporosity flow from matrix and vug into fracture, fracture pseudoradial flow, system linear flow, system pseudoradial flow, and pseudosteady flow occur in sequence. e greater the difference of permeability between the dual-porosity/triple-porosity section and the two homogeneous sections, the more obvious the interporosity flow on the pressure derivative curve. is approach satisfies the need for pressure transient analysis for a horizontal well that traverses two or more regions with distinct properties in heterogeneous carbonate reservoirs.

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“…Although the previous proposed models can be used for forecasting the production in water influx reservoirs, they have not taken the effect of material balance into account. Among the transient analysis models [15][16][17] and production analysis methods [18][19][20][21][22][23], the Blasingame type curves technique [21][22][23] derived using the reservoirs' material balance equation is a very popular and practical production decline analysis. is method, which can be used to evaluate the reservoir properties, drainage volume, etc., has been widely implemented in conventional reservoirs for several decades.…”

Section: Introductionmentioning

confidence: 99%

“…is method, which can be used to evaluate the reservoir properties, drainage volume, etc., has been widely implemented in conventional reservoirs for several decades. However, most of the previous efforts [22,[24][25][26][27][28] for improving the Blasingame decline type curves analysis have been mainly focused on the primary production, rather than on the secondary depletion.…”

Section: Introductionmentioning

confidence: 99%

Production Decline Behavior Analysis of a Vertical Well with a Natural Water Influx/Waterflood

Wei

Ren

Duan

et al. 2019

Mathematical Problems in Engineering

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The production decline type curves are considered as a robust technique to interpret the production data and obtain the flow parameters, the original gas in place, etc. However, most of the previous models have focused on the primary depletion with a closed boundary, rather than on the secondary depletion with a water influx/waterflood. Therefore, in this study, a transient flow model considering the water influx/waterflood is developed. Subsequently, the functions of the production decline type curves for a vertical well with a water influx/waterflood are derived based on the material balance equation. In other words, the theory of Blasingame production decline analysis is extended to the water influx/waterflood reservoir. Further advanced Blasingame production decline type curves for a vertical well in water influx/waterflood reservoirs are generated. Compared with Blasingame type curves without a water influx/waterflood, the behavior of the ones presented in this study is quite different at the boundary. Thereafter, the effects of the relevant parameters, including the dimensionless maximum water influx, the dimensionless beginning time of the water influx, and the dimensionless external boundary radius, are studied on type curves. Finally, Blasingame type curves for a vertical well in water influx/waterflood reservoirs are verified through a field case study. This work provides very meaningful references for reservoir engineers working on the evaluation of the water influx and the estimation of the beginning time of the water influx by matching the developed type curves with the actual field data.

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Blasingame decline type curves with material balance pseudo-time modified for multi-fractured horizontal wells in shale gas reservoirs

Cited by 37 publications

References 41 publications

Coupling of high Knudsen number and non-ideal gas effects in microporous media

Coupling of high Knudsen number and non-ideal gas effects in microporous media

Pressure Transient Analysis for a Horizontal Well in Heterogeneous Carbonate Reservoirs Using a Linear Composite Model

Production Decline Behavior Analysis of a Vertical Well with a Natural Water Influx/Waterflood

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