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
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Skin factor and production data analysis under conditions of rock deformation and pore collapse
Antonio Claudio Soares
José Eurico Altoe
Francisco Henriques Ferreira
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
Three axial compressibility cell
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).