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

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

slide2
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
PERMEABILITY DESCREASES WITH STRESS

1

Radial flow

Fixed borehole

pressure

Drainage

radius

2

2

3

1

slide5

Question for exam on Well Testing :

What language is it?

Hint: It is not Russian

slide8

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

slide15

Dupui equation

for low compressible fluid and rock

slide16

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):

slide20

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.

slide21

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

slide22

With reservoir pressure variation from 300 bar to 150 bar,

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

slide23

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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