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Research Papers: Petroleum Wells-Drilling/Production/Construction

Type Curves Analysis for Asymmetrically Fractured Wells

[+] Author and Article Information
Lei Wang, Xiaodong Wang

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

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 29, 2012; final manuscript received September 28, 2013; published online November 26, 2013. Assoc. Editor: Arash Dahi Taleghani.

J. Energy Resour. Technol 136(2), 023101 (Nov 26, 2013) (8 pages) Paper No: JERT-12-1196; doi: 10.1115/1.4025712 History: Received August 29, 2012; Revised September 28, 2013

In this paper, a new constant rate solution for asymmetrically fractured wells was proposed to analyze the effect of fracture asymmetry on type curves. Calculative results showed that for a small wellbore storage coefficient or for the low fracture conductivity, the effect of fracture asymmetry on early flow was very strong. The existence of the fracture asymmetry would cause bigger pressure depletion and make the starting time of linear flow occur earlier. Then, new type curves were established for different fracture asymmetry factor and different fracture conductivity. It was shown that a bigger fracture asymmetry factor and low fracture conductivity would prolong the time of wellbore storage effects. Therefore, to reduce wellbore storage effects, it was essential to keep higher fracture conductivity and fracture symmetry during the hydraulic fracturing design. Finally, a case example is performed to demonstrate the methodology of new type curves analysis and its validation for calculating important formation parameters.

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References

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Figures

Grahic Jump Location
Fig. 1

Asymmetrically fractured well in a circular closed reservoir

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Fig. 2

The comparison for our results and constant rate solution in the literature

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Fig. 3

The effect of different locations of the well on the distribution of flux for tD = 10−3 and CfD = 0.1π

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Fig. 4

The effect of different locations of the well on the distribution of flux for tD = 10−3 and CfD = 5π

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Fig. 5

New type curves for asymmetrically fractured wells (θ = 0, CfD = 1, Sk = 0)

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Fig. 6

New type curves for asymmetrically fractured wells (θ = 1, CfD = 1, Sk = 0)

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Fig. 7

New type curves for asymmetrically fractured wells (θ = 0, CfD = 500, Sk = 0)

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Fig. 8

New type curves for asymmetrically fractured wells (θ = 1, CfD = 500, Sk = 0)

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Fig. 9

The effect of fracture asymmetry factor on type curves (CD = 10−4, CfD = 10, Sk = 0)

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Fig. 10

The effect of fracture asymmetry factor on type curves (CD = 100, CfD = 10, Sk = 0)

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Fig. 11

The effect of fracture asymmetry factor on type curves (CD = 10−4, CfD = 1, Sk = 0)

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Fig. 12

The effect of fracture asymmetry factor on type curves (CD = 10−4, CfD = 50, Sk = 0)

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Fig. 13

The effect of fracture asymmetry factor on type curves (CD = 10−4, CfD = 1, Sk = 0.5)

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Fig. 14

The effect of fracture asymmetry factor on type curves (CD = 10−4, CfD = 1, Sk = 5)

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Fig. 15

Match of pressure data for an example on Economides type curves for a well of a finite conductivity vertical fracture (CD = 10−4, CfD = 5)

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Fig. 16

Match of pressure data for an example on new type curves for a well of a finite conductivity asymmetric fracture (CD = 10−4, CfD = 5 and θ = 0.8)

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