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Selection of candidate wells for re-fracturing in tight gas sand reservoirs using fuzzy inference
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ARTUN Emre,KULGA Burak
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Table 1 Associated parameters and corresponding values for the re-fracturing well selection.
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| Category | Hydraulic-fracture quality | Reservoir characteristics | Initial conditions | Fracture
length/m(ft) | Fracture permeability/μm2 | Fracture width/mm(in) | Thickness/
m(ft) | Porosity/
% | Permeability/
10-3 μm2 | Temperature/
°C(°F) | Drainage area/
km2(acre) | Initial pressure/
MPa(psi) | | LOW | 152.4(500) | 1 | 2.54(0.10) | 15.2(50) | 3 | 0.000 001 | 26.7(80) | 0.16(40) | 6.9(1 000) | | MID | 381.0(1 250) | 50 | 6.35(0.25) | 68.6(225) | 14 | 0.050 000 | 82.2(180) | 4.05(1 000) | 31.0(4 500) | | HIGH | 609.6(2 000) | 100 | 10.16(0.40) | 121.9(400) | 25 | 0.100 000 | 137.8(280) | 8.09(2 000) | 55.2(8 000) | | Category | Operational parameters | Well performance | Bottom-hole
flowing pressure/
MPa(psi) | Number of
hydraulic fractures | Length of the
horizontal-well/
m(ft) | Initial production rate/
(104 m3?d-1)(MMSCF?d-1) | 3-year cumulative recovery/
108 m3(BCF) | 5-year cumulative recovery/
108 m3(BCF) | | LOW | 0.1(15) | 1 | 304.8(1 000) | 2.8(1) | 0.03(0.1) | 0.03(0.1) | | MID | 13.8(2 000) | 15 | 1 371.6(4 500) | 566.0(200) | 14.15(50) | 16.98(60) | | HIGH | 27.6(4 000) | 30 | 2 438.4(8 000) | 1 132.0(400) | 113.20(400) | 176.88(625) |
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