Skin factor and production data analysis under conditions of rock deformation and pore collapse
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Skin factor and production data analysis under conditions of rock deformation and pore collapse. Antonio Claudio Soares José Eurico Altoe Pavel Bedrikovetsky Francisco Henriques Ferreira. CONTENTS PERMEABILITY VARIATION AND STRESS-STRAIN STATE OF A ROCK LABORATORY SETUP & TEST RESULTS

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Skin factor and production data analysis under conditions of rock deformation and pore collapse l.jpg

Skin factor and production data analysis under conditions of rock deformation and pore collapse

Antonio Claudio Soares

José Eurico Altoe

Pavel Bedrikovetsky

Francisco Henriques Ferreira


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CONTENTS rock deformation and pore collapse

  • PERMEABILITY VARIATION AND STRESS-STRAIN STATE OF A ROCK

  • LABORATORY SETUP & TEST RESULTS

  • ANALYTICAL MODEL & FIELD PRODUCTION DATA TREATMENT

  • COMPARISON BETWEEN LAB & FIELD DATA


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PERMEABILITY DESCREASES WITH STRESS rock deformation and pore collapse

1

Radial flow

Fixed borehole

pressure

Drainage

radius

2

2

3

1


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Schema of laboratory test rock deformation and pore collapse


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Question for exam on Well Testing : rock deformation and pore collapse

What language is it?

Hint: It is not Russian


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Rock compressibility laboratory set-up rock deformation and pore collapse


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Coreholder in rock compressibility set-up rock deformation and pore collapse


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Vertical core sample rock deformation and pore collapse

Vertical shear stress: 2000 psi

Horizontal shear stress : 1015 psi

400 psi

2000 psi

2000 psi

400 psi

400 psi

1015 psi

2000 psi

400 psi

4300 md

3085 md

2500 md

2800 md


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Three axial compressibility cell rock deformation and pore collapse


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CORE FROM FIELD A – I PHASE rock deformation and pore collapse


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CORE FROM FIELD A – II PHASE rock deformation and pore collapse


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GIANT DEEPWATER OFFSHORE rock deformation and pore collapse


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STRESS-STRAIN MEASUREMENT DATA rock deformation and pore collapse


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TERZHAGY THEORY -> PERMEABILITY DAMAGE rock deformation and pore collapse


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Dupui equation rock deformation and pore collapse

for low compressible fluid and rock


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The permeability decrement is determined from the plot of relative production rate decrease as a function of drawdown, in semi-logarithmic coordinates

Formula for the rate q=q(Pres, Dp)

For the case of varying Dp(t):


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ANALYSIS OF LABORATORY DATA relative production rate decrease as a function of drawdown, in semi-logarithmic coordinates


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FORMULA FOR PERMEABILITY DECREMENT : relative production rate decrease as a function of drawdown, in semi-logarithmic coordinates

b = 0.0248 1/Mpa


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WELL PRODUCTION DATA relative production rate decrease as a function of drawdown, in semi-logarithmic coordinates


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The previous plot shows the production rate q, drawdown relative production rate decrease as a function of drawdown, in semi-logarithmic coordinatesDp and productivity index IP versus reservoir pressure pRES.

 The permeability decrement equals

b = 0.019 1/Mpa.


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Prediction of well productivity relative production rate decrease as a function of drawdown, in semi-logarithmic coordinates

Fig. Shows plots for production rate q=q(pRES, Dp) versus drawdown for different reservoir pressure pRES = 300, 250, 200 e 150 bar.

The drawdown interval is Dp é 10-60 bar.

 Productivity index decreases during reservoir pressure depletion


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With reservoir pressure variation from 300 bar to 150 bar, relative production rate decrease as a function of drawdown, in semi-logarithmic coordinates

IP decreases from 55 m3/(day*bar) to 40 m3/(day*bar).


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  • Conclusions relative production rate decrease as a function of drawdown, in semi-logarithmic coordinates

  • A method for permeability decrement calculation from productivity index history was developed

  • The laboratory setup for triaxial test allows calculating permeability decrement of the core

  •  The values for permeability decrement as obtained from laboratory test and from laboratory triaxial test for the field B cores are in a good agreement

  • It allows to claim the pore collapse permeability damage to be a reason for PI impairment during pressure depletion of the field B


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