TAREA PRESIONES
2
TAREA 2 - ANALISIS DE PRESIONES PROF. JAVIER A. MARTINEZ P. Fecha de asignación: Viernes 27 de Marzo de 2015 Fecha de entrega: Lunes 13 de Abril de 2015 1. An oil well has been produced at a constant rate of 250 STB/D. During the flow period, bottom-hole pressures were recorded as tabulated below. Other rock and fluid properties are listed. r w = 3.5 in φ = 20 % µ = 1.2 cp h = 50 ft B = 1.229 bbl/STB c o = 1.6x10 -5 1/psi c f = 3.5x10 -5 1/psi Find using Conventional (Semilog method) a) Permeability of this oil reservoir b) Flow Efficiency and Damage factor. Is the well damaged or stimulated? c) Wellbore storage (WBS) d) Radius of investigation at the end of the test Table 1. Recorded bottom-hole pressures (problem 1) t, hr P wf , psia ∆P, psi t, hr P wf , psia ∆P, psi 0 2733 0 4 2329 404 0.1 2703 30 5 2312 421 0.2 2672 61 7 2293 440 0.3 2644 89 9.6 2291 442 0.4 2616 117 12 2290 443 0.65 2553 180 16.8 2287 446 1 2500 233 33.6 2282 451 2 2398 335 50 2279 454 3 2353 380 72 2276 457 4 2329 404 100 2272 461 2. Table 2 presents the drawdown test data taken in a well drilled in a permeable reservoir. Estimate permeability, wellbore storage, skin factor, drainage area and radius of investigation at the end of the test. How long will the wellbore storage effects affect the test? Additional data is given below: q = 440 STB/D P i = 3300 Psia µ = 0.6 cp B = 1.340 rb/STB c t = 1.72x10 -5 1/psi h = 200 ft r w = 0.25 ft φ = 0.2
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TAREA PRESIONES
Transcript of TAREA PRESIONES
TAREA 2 - ANALISIS DE PRESIONES PROF. JAVIER A. MARTINEZ P.
Fecha de asignación: Viernes 27 de Marzo de 2015 Fecha de entrega: Lunes 13 de Abril de 2015
1. An oil well has been produced at a constant rate of 250 STB/D. During the flow period, bottom-hole pressures were recorded as tabulated below. Other rock and fluid properties are listed.
rw = 3.5 in φ = 20 % µ = 1.2 cp h = 50 ft B = 1.229 bbl/STB co = 1.6x10-5 1/psi cf = 3.5x10-5 1/psi Find using Conventional (Semilog method) a) Permeability of this oil reservoir b) Flow Efficiency and Damage factor. Is the well damaged or stimulated? c) Wellbore storage (WBS) d) Radius of investigation at the end of the test
Table 1. Recorded bottom-hole pressures (problem 1)
t, hr Pwf, psia ∆P, psi t, hr Pwf, psia ∆P, psi
0 2733 0 4 2329 404 0.1 2703 30 5 2312 421 0.2 2672 61 7 2293 440 0.3 2644 89 9.6 2291 442 0.4 2616 117 12 2290 443 0.65 2553 180 16.8 2287 446
1 2500 233 33.6 2282 451 2 2398 335 50 2279 454 3 2353 380 72 2276 457 4 2329 404 100 2272 461
2. Table 2 presents the drawdown test data taken in a well drilled in a permeable reservoir. Estimate permeability, wellbore storage, skin factor, drainage area and radius of investigation at the end of the test. How long will the wellbore storage effects affect the test? Additional data is given below:
q = 440 STB/D Pi = 3300 Psia µ = 0.6 cp B = 1.340 rb/STB ct = 1.72x10-5 1/psi h = 200 ft rw = 0.25 ft φ = 0.2
Table 2. Drawdown Test data for problem 2
t, hr Pwf, Psia t, hr Pwf, Psia t, hr Pwf, Psia t, hr Pwf, Psia 0 3300 0.0103 3296.97 0.136 3293.97 1.798 3292.30
0.000330 3299.84 0.0122 3296.66 0.162 3293.85 2.136 3292.19 0.000657 3299.69 0.0145 3296.35 0.192 3293.74 2.537 3292.08 0.00110 3299.49 0.0173 3296.06 0.228 3293.63 3.013 3291.96 0.00155 3299.30 0.0205 3295.77 0.271 3293.52 3.579 3291.83 0.00184 3299.19 0.0244 3295.51 0.322 3293.41 4.251 3291.69 0.00219 3299.05 0.0289 3295.28 0.382 3293.30 5.049 3291.53 0.00260 3298.90 0.0344 3295.07 0.454 3293.19 5.997 3291.34 0.00309 3298.73 0.0408 3294.88 0.539 3293.08 7.123 3291.11 0.00367 3298.54 0.0485 3294.72 0.640 3292.97 8.460 3290.84 0.00436 3298.32 0.0576 3294.58 0.761 3292.86 10.049 3290.53 0.00518 3298.09 0.0684 3294.44 0.903 3292.75 11.936 3290.15 0.00615 3297.83 0.0812 3294.32 1.073 3292.64 14.177 3289.70 0.00730 3297.56 0.0965 3294.20 1.275 3292.52 16.838 3289.17 0.00867 3297.27 0.115 3294.08 1.514 3292.41 20 3288.54
