PROCEDURE FOR DEVELOPMENT OF NON-UNIFORM MASSIVE OR MULTIPAY GAS-OIL OR OIL-GAS-CONDENSATE FIELD Russian patent published in 2011 - IPC E21B43/00 E21B49/00 

FIELD: oil and gas production.

SUBSTANCE: procedure consists in drilling boreholes, in recovery of core, in geophysical survey, in testing and in hydro-dynamic survey of separate intervals by thickness of cross-section. According to the inventions database is created on results of measurements of various geo-physical parametres accepted for each region for each 0.05-0.15 m of pay thickness. Parameters with asymmetrical logging normal distribution are converted to normal distribution; all parametres are standardised by subtraction of average and by division to mean square deviation. There is made hierarchic procedure of classes arrangement consisting in successive interlayers uniting in such a way that obtained classes have minimal parametres spread around centre - dispersion. Ranges of changes and average values of these parametres for each singled out class of pays are calculated. There is determined nature of lithology, filtration-capacitive properties and fluid saturation of each class on qualitative level with consideration of fundamental links of these parametres and mineral element composition of rock. There are additionally used results of core analysis, of tests and hydro-dynamic survey in intervals of separate classes-pays; the said characteristics are determined at quantitative level. Singled out classes between boreholes are correlated. There is built geological-hydrodynamic model of producing deposit on base of which there is evaluated efficiency of system of development for various versions of inclusion of singled out classes into operational objects. There are made calculations of process indices of development with determination of levels of hydrocarbon extractions under various modes and there are evaluated prognosis coefficients of oil extraction for separate operational objects and field in whole. The best version is realised in practice.

EFFECT: differentiation of non-uniform massive or multi-pay producing cross section represented with non-collectors and collectors with various lithology and fluid saturation into typical intervals - classes-pays in each borehole using data of all performed complex of survey.

2 cl, 1 ex, 8 tbl, 10 dwg