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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

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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

  • ANALYTICAL MODEL & FIELD PRODUCTION DATA TREATMENT

  • COMPARISON BETWEEN LAB & FIELD DATA


PERMEABILITY DESCREASES WITH STRESS

1

Radial flow

Fixed borehole

pressure

Drainage

radius

2

2

3

1


Schema of laboratory test


Question for exam on Well Testing :

What language is it?

Hint: It is not Russian


Rock compressibility laboratory set-up


Coreholder in rock compressibility set-up


Vertical core sample

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


Three axial compressibility cell


CORE FROM FIELD A – I PHASE


CORE FROM FIELD A – II PHASE


GIANT DEEPWATER OFFSHORE


STRESS-STRAIN MEASUREMENT DATA


TERZHAGY THEORY -> PERMEABILITY DAMAGE


Dupui equation

for low compressible fluid and rock


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):


ANALYSIS OF LABORATORY DATA


FORMULA FOR PERMEABILITY DECREMENT :

b = 0.0248 1/Mpa


WELL PRODUCTION DATA


The previous plot shows the production rate q, drawdown Dp and productivity index IP versus reservoir pressure pRES.

 The permeability decrement equals

b = 0.019 1/Mpa.


Prediction of well productivity

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


With reservoir pressure variation from 300 bar to 150 bar,

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


  • Conclusions

  • 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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