Difference between revisions of "JD"
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:<math> \bar{P} </math> = average reservoir pressure, psia | :<math> \bar{P} </math> = average reservoir pressure, psia | ||
:<math> P_{wf} </math> = well flowing pressure, psia | :<math> P_{wf} </math> = well flowing pressure, psia | ||
| + | :<math> q </math> = flowing rate, stb/d | ||
| + | :<math> q_g </math> = gas rate, MMscfd | ||
:<math> r_w </math> = wellbore radius, ft | :<math> r_w </math> = wellbore radius, ft | ||
:<math> r_e </math> = drainage radius, ft | :<math> r_e </math> = drainage radius, ft | ||
Revision as of 16:42, 11 August 2018
Brief
JD - dimensionless productivity index, inverse of dimensionless pressure (based on average pressure) [1].
Math & Physics
From the Darcy's law for an unfractured well located in the center of a circular drainage area, the JD in pseudo-steady state is as follows:
Oil
Gas
Nomenclature
= formation volume factor, bbl/stb
= dimensionless productivity index, dimensionless
= permeability times thickness, md*ft
= average reservoir pressure, psia
= well flowing pressure, psia
= flowing rate, stb/d
= gas rate, MMscfd
= wellbore radius, ft
= drainage radius, ft
= skin factor, dimensionless
Greek symbols
= viscosity, cp
References
- ↑ Rueda, J.I.; Mach, J.; Wolcott, D. (2004). "Pushing Fracturing Limits to Maximize Producibility in Turbidite Formations in Russia"
(SPE-91760-MS). Society of Petroleum Engineers.
