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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. 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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  1. 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

  2. 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

  3. PERMEABILITY DESCREASES WITH STRESS 1 Radial flow Fixed borehole pressure Drainage radius 2 2 3 1

  4. Schema of laboratory test

  5. Question for exam on Well Testing : What language is it? Hint: It is not Russian

  6. Rock compressibility laboratory set-up

  7. Coreholder in rock compressibility set-up

  8. 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

  9. Three axial compressibility cell

  10. CORE FROM FIELD A – I PHASE

  11. CORE FROM FIELD A – II PHASE

  12. GIANT DEEPWATER OFFSHORE

  13. STRESS-STRAIN MEASUREMENT DATA

  14. TERZHAGY THEORY -> PERMEABILITY DAMAGE

  15. Dupui equation for low compressible fluid and rock

  16. 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):

  17. ANALYSIS OF LABORATORY DATA

  18. FORMULA FOR PERMEABILITY DECREMENT : b = 0.0248 1/Mpa

  19. WELL PRODUCTION DATA

  20. 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.

  21. 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

  22. With reservoir pressure variation from 300 bar to 150 bar, IP decreases from 55 m3/(day*bar) to 40 m3/(day*bar).

  23. 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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