RTA · Rate Transient Analysis

RTA·

Rate Transient Analysis

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Fluid System

Reservoir & Fluid Properties

p_i (psia)

p₀ saturated

T (°F)

gas SG

API

Pb (psia)

Swi

cw (1/psi)

cf (1/psi)

h (ft)

rw (ft)

Two-phase method

Sor

Sgc

kro exp nₒ

krg exp n_g

kro end

krg end

Production Data

CSV/XLSX · columns: t_day, q_g, q_o, q_w, p_wf Count water in material balance time t_ca = Q/q stands in for reservoir voidage. That holds while one phase is essentially all the reservoir gives up; once water is a material share it breaks, the time axis comes out short, and in-place reads low. Off by default so existing results do not move. Note the correction only bites when water cut changes — a constant ratio cancels out of Q/q.

no file — use sample

Analysis Windows

BDF start idx

IARF start

IARF end

time basis

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Rate Transient Analysis

Set properties, load production data, then Run.
Gas · Oil · Gas-Oil — OGIP/OOIP, k & skin.

Production History

Flowing Material Balance — gas: p̄/z̄ vs Gp · liquid: q/Δψ vs Np

IARF Semilog — k & skin

Rate-Integral Type Curve — q_n, q_ni, q_nid vs material-balance time · Blasingame / Agarwal-Gardner

Production History

Flowing Material Balance — gas: p̄/z̄ vs Gp · liquid: q/Δψ vs Np

IARF Semilog — k & skin

Rate-Integral Type Curve — qn, qni, qnid vs material-balance time · Blasingame / Agarwal-Gardner

Rate-Integral Type Curve — q_n, q_ni, q_nid vs material-balance time · Blasingame / Agarwal-Gardner