Linearly Supported Radial Flow—A New Flow Regime Identified in Dual-Porosity Reservoirs

2000 ◽  
Author(s):  
Guo Boyun ◽  
George Stewart ◽  
Mario Toro
Keyword(s):  
Flow Regime ◽  
Radial Flow ◽  
Dual Porosity

A Novel Approach To Detect Interacting Behavior Between Hydraulic Fracture and Natural Fracture by Use of Semianalytical Pressure-Transient Model

SPE Journal ◽  
2017 ◽  
Vol 22 (06) ◽  
pp. 1834-1855 ◽  
Author(s):  
Cong Xiao ◽  
Leng Tian ◽  
Yayun Zhang ◽  
Tengfei Hou ◽  
Yaokun Yang ◽  
...  
Keyword(s):  
Flow Regime ◽  
Hydraulic Fracture ◽  
Radial Flow ◽  
Natural Fracture ◽  
Dual Porosity ◽  
Horizontal Distance ◽  
Fracture System ◽  
Transient Model ◽  
Pressure Transient ◽  
Transient Characteristics

Summary The detection of interacting behavior between the hydraulic fracture (HF) and the natural fracture (NF) is of significance to accurately and efficiently characterize an underground complex-fracture system induced by hydraulic-fracturing technology. This work develops a semianalytical pressure-transient model in the Laplace domain to detect interacting behavior between HF and NF depending on pressure-transient characteristics. Our results have shown that no matter what the flow state (compressible or incompressible flow) within a hydraulically induced fracture system, we can easily detect interacting behavior between HF and NF depending on whether the “dip” shape occurs at the formation radial-flow regime. Referring to sensitivity analysis, distance between NF and well, horizontal distance between NF and HF, and NF length are the three most sensitive factors to detect fracture-interacting behavior. Depending on interference analysis, although the pressure-transient characteristics of a pseudosteady-state dual-porosity model can interfere with our proposed methodology, the difference between our model and a pseudosteady-state dual-porosity system lies in whether the value of the horizontal line of dimensionless pressure derivative is equal to 0.5 at the formation radial-flow regime. Our work obtains some innovative insights into detecting fracture-interacting behavior, and the valuable results can provide significant guidance for refracturing operations and fracture detection in an underground fracture system.

A Novel sand control testing facility to evaluate the impact of radial flow regime on screen performance and its verification

2020 ◽  
Vol 195 ◽  
pp. 107903
Author(s):  
Mohammad Haftani ◽  
Omar Kotb ◽  
Phuong Hoang Nguyen ◽  
Chenxi Wang ◽  
Mahmood Salimi ◽  
...  
Keyword(s):  
Flow Regime ◽  
Radial Flow ◽  
Testing Facility ◽  
Sand Control ◽  
Screen Performance ◽  
The Impact

scholarly journals Production performance analysis for horizontal wells in composite coal bed methane reservoir

2017 ◽  
Vol 35 (2) ◽  
pp. 194-217 ◽  
Author(s):  
Zhang Wei ◽  
Jiang Ruizhong ◽  
Xu Jianchun ◽  
Gao Yihua ◽  
Yang Yibo
Keyword(s):  
Performance Analysis ◽  
Flow Regime ◽  
Transient Analysis ◽  
Horizontal Well ◽  
Radial Flow ◽  
Production Performance ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Pressure Transient Analysis ◽  
Pressure Transient

In this paper, the mathematical model of production performance analysis for horizontal wells in composite coal bed methane reservoir is introduced. In this model, two regions with different formation parameters are distinguished, and multiple mechanisms are considered including desorption, diffusion, and viscous flow. Then the solution of horizontal well performance analysis model is obtained by using point source function method, Laplace transform, and Stehfest algorithm comprehensively. The solution of the proposed model is verified with previous work thoroughly. The pressure transient analysis for horizontal well when producing at a constant rate is obtained and discussed. At last, different flow regimes are divided based on pressure transient analysis curves. They are early wellbore storage period, skin factor period, first radial flow regime, transition regime, second radial flow regime, transfer regime, and late pseudo-radial flow regime. The effects of related parameters such as storativity ratio, transfer coefficient, adsorption coefficient, ratio of vertical permeability to horizontal permeability, skin factor, horizontal well position in vertical direction, and inner region radius are analyzed as well according to pressure transient analysis and rate transient analysis curves. The presented work in this paper can give a better understanding of coal bed methane production performance in composite reservoir.

scholarly journals Production decline type curves analysis of a finite conductivity fractured well in coalbed methane reservoirs

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 143-153 ◽  
Author(s):  
Mingqiang Wei ◽  
Ming Wen ◽  
Yonggang Duan ◽  
Quantang Fang ◽  
Keyi Ren
Keyword(s):  
Flow Regime ◽  
Coalbed Methane ◽  
Radial Flow ◽  
Production Model ◽  
Finite Conductivity ◽  
Type Curves ◽  
State Diffusion ◽  
Diffusion And Convection ◽  
Fractured Well ◽  
Advanced Production

AbstractProduction decline type curves analysis is one of the robust methods used to analyze transport flow behaviors and to evaluate reservoir properties, original gas in place, etc. Although advanced production decline analysis methods for several well types in conventional reservoirs are widely used, there are few models of production decline type curves for a fractured well in coalbed methane (CBM) reservoirs. In this work, a novel pseudo state diffusion and convection model is firstly developed to describe CBM transport in matrix systems. Subsequently, based on the Langmuir adsorption isotherm, pseudo state diffusion and convection in matrix systems and Darcy flow in cleat systems, the production model of a CBM well with a finite conductivity fracture is derived and solved by Laplace transform. Advanced production decline type curves of a fractured well in CBM reservoirs are plotted through the Stehfest numerical inversion algorithm and computer programming. Six flow regimes, including linear flow regime, early radial flow in cleat systems, interporosity flow regime, late pseudo radial flow regime, transient regime and boundary dominated flow regime, are recognized. Finally, the effect of relevant parameters, including the storage coefficient of gas in cleat systems, the transfer coefficient from a matrix system to the cleat system, the modified coefficient of permeability, dimensionless fracture conductivity and dimensionless reservoir drainage radius, are analyzed on type curves. This paper does not only enrich the production decline type curves model of CBM reservoirs, but also expands our understanding of fractured well transport behaviors in CBM reservoirs and guides to analyze the well's production performance.

scholarly journals Pressure Transient Analysis for Sandstone Reservoir by Using Saphir

2020 ◽  
pp. 17-24
Author(s):  
Hussein Al- Ali
Keyword(s):  
Flow Regime ◽  
Transient Analysis ◽  
Radial Flow ◽  
Stone Formation ◽  
Cross Flow ◽  
Reservoir Model ◽  
Pressure Transient Analysis ◽  
Pressure Transient ◽  
Flow Regime Transition ◽  
A Value

This work is discussed how to differentiate between two tricky models for sand stone formation by using the pressure transient analysis PTA for three Wells which are distributed in south, middle and north of X field. In the derivative curve these two models have the same sequence of flow regime which are by hump, first radial flow regime, transition hump and then late radial flow regime. The parameter Kappa (K) played the most important key to select the type of reservoir model and differentiate between the two models in PTA. In the middle and south of the field, this parameter has a value close to one at well no. Rt-16 & Rt-18, which means that the system behaves as dual porosity. On the other hand, Kappa has a value of around (0.74) in Rt-17 to represent a double permeability system but without cross flow between two layers due to the small value of Lamda.

scholarly journals Flow Regime Analysis on Pressure Build-up Test Result of Z-01 Well Using Dual Porosity Reservoir Model

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
Anggitya Hafidh ◽  
Muhammad Taufiq Fathaddin
Keyword(s):  
Flow Regime ◽  
Early Time ◽  
Dual Porosity ◽  
Support Pressure ◽  
Finite Conductivity ◽  
Late Time ◽  
Well Test ◽  
Time Flow ◽  
Time Region ◽  
Regime Analysis

<em>Flow regime analysis on the results of pressure build-up Z-01 well test was conducted to determine the type of flow that occurs in each time region section. In the early time stage there is a flow which is dominated by linear flow which is then followed by bilinear flow. At the middle time there is a radial flow where the pressure disturbance has spread towards the reservoir. In the late time flow stage is dominated by steadystate flow where the flow is affected because there is a support pressure caused by the constant pressure boundary. In the analysis of pressure build-up used to determine reservoir parameters can be used in the middle time region. This is used because the plot results between ΔP vs. log HTR (Horner Time Ratio) are straight lines which can be used to calculate reservoir parameter values such as permeability (k), formation damage factor (s). This test was analyzed using the Ecrin software and obtained a dual porosity model with a permeability value of 4.8 md, skin -3.57. From the analyzed model, it is obtained that the well fracture-finite conductivity model means that the Z-01 well has been stimulated to increase production.</em>

Pressure Derivative Studies of a Laterally Infinite Reservoir with a Horizontal Well

2009 ◽  
Vol 62-64 ◽  
pp. 420-425
Author(s):  
K. Ovwigho ◽  
E. Steve Adewole
Keyword(s):  
Flow Regime ◽  
Horizontal Well ◽  
Radial Flow ◽  
Pressure Derivative ◽  
Dimensionless Pressure ◽  
Derivatives Of ◽  
Infinite Reservoir

Dimensionless pressure derivatives of a laterally infinite reservoir drained with a horizontal well are studied. The effect of anisotropy on the derivative response is also studied. It is revealed that anisotropy mainly affects the start of the late radial flow regime, and for cases where LD is small (<0.5), affects the end of the first radial flow regime. Time criteria equations were also developed to delineate flow periods and have been shown to give good results for the range 0.00005 ≤ rwD ≤ 0.01 and 0.1 ≤ LD ≤ 100.

Sign in / Sign up

Export Citation Format

Share Document