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Oil/Gas Reservoirs

Rate Decline Curves Analysis of a Vertical Fractured Well With Fracture Face Damage

[+] Author and Article Information
Wang Lei, Wang Xiao-dong, Ding Xu-min, Zhang Li, Li Chen

 School of Energy Resources, China University of Geosciences, Beijing 100083, China

J. Energy Resour. Technol 134(3), 032803 (Jun 21, 2012) (9 pages) doi:10.1115/1.4006865 History: Received November 28, 2011; Revised April 23, 2012; Published June 21, 2012; Online June 21, 2012

Rate decline analysis is a significant method for predicting well performance. Previous studies on rate decline analysis of fractured wells are all based on homogeneous reservoirs rather than homogeneous ones considering fracture face damage. In this article, a well model intercepted by a finite conductivity vertical fracture with fracture face damage is established to investigate how face damage factor affects the productivity of fractured well. Calculative results show that in transient flow, dimensionless rate decreases with the increase of fracture face damage and in pseudo steady-state flow, all curves under different face damage factors coincide with each other. Then, a new pseudo steady-state analytic formula and its validation are presented. Finally, new Blasingame type curves are established. It is shown that the existence of fracture damage would decrease the rate when time is relatively small, so fracture damage is an essential factor that we should consider for type curves analysis. Compared with traditional type curves, new type curves could solve the problem of both variable rate and variable pressure drop for fractured wells with fracture face damage factor. A gas reservoir example is performed to demonstrate the methodology of new type curves analysis and its validation for calculating important formation parameters.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Finite conductivity vertical fracture in a bounded slap reservoir

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Figure 2

Fracture flow model

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Figure 3

The reservoir flow model

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Figure 4

Fractured well with a damaged zone around the fracture

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Figure 5

The comparison for the results of this paper and Riley [29]

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Figure 6

The comparison for analytic function and fitted function of f(CfD )

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Figure 7

Comparison of numerical solution and pseudo steady-state solution for a well with a finite conductivity vertical fracture (CfD  = 0.1, SfD = 0)

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Figure 8

Comparison of numerical solution and pseudo steady-state solution for a well with a finite conductivity vertical fracture (CfD  = 0.1, SfD = 0.5)

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Figure 9

Rate decline curves for a well with a finite conductivity vertical fracture at different values of SfD (reD  = 4, CfD  = 0.5)

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Figure 10

Rate decline curves for a well with a finite conductivity vertical fracture at different values of reD (SfD  = 0.5 and SfD  = 0, CfD  = 0.5)

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Figure 11

New Blasingame type curves for fractured wells with fracture face damage (CfD  = 10, SfD  = 0)

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Figure 12

New Blasingame type curves for fractured wells with fracture face damage (CfD = 10, SfD  = 0.5)

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Figure 13

New Blasingame type curves for fractured wells with fracture face damage (CfD  = 0.5, SfD  = 0.1)

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Figure 14

New Blasingame type curves for fractured wells with fracture face damage (CfD  = 5, SfD  = 0.1)

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Figure 15

The effect of fracture damage factor on type curves for reD  = 15 and CfD  = 0.5

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Figure 16

The effect of fracture damage factor on type curves for reD  = 15 and CfD  = 5

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Figure 17

The effect of fracture damage factor on type curves for reD  = 15 and CfD  = 50

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Figure 18

The effect of fracture damage factor on type curves for reD  = 5 and CfD  = 50

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Figure 19

The effect of fracture damage factor on type curves for reD  = 25 and CfD  = 50

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Figure 20

The effect of fracture damage factor on type curves for reD  = 100 and CfD  = 50

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Figure 21

Match of production data for an example on the new Blasingame decline type curve for a well of a finite conductivity vertical fracture with face damage (SfD  = 0.1, CfD = 20)

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