METHOD DETERMINING CONDITION OF FACE ZONE OF GAS WELL Russian patent published in 2000 - IPC

FIELD: gas production industry, gas dynamic examination of gas wells at stationary filtration modes. SUBSTANCE: objective of invention consists in generation of some geophysical parameters that are usually obtained during depth tests only. With this in mind specific productivity of each type of collector in opened productive thickness of well and its average value for whole thickness under one fixed depression in pool, hydraulic resistance of perforation holes, critical Reynolds number are used by which values theoretically maximum discharge at which linear filtration law in face zone of well is maintained is calculated. Its relation to practically maximum discharge is employed to evaluate condition of face zone of well and namely: with Qpro

/Qtho>1 R_eff>R_w, with Qpro/Qtho<1 R_eff<R_w, where Qpro,Qtho are correspondingly practical and theoretical maximum discharges under which linear filtration law of face zone is maintained; R_eff,R_w are correspondingly effective radius of inflow and radius of well. EFFECT: generation of some geophysical parameters usually obtained during depth tests.