METHOD OF ADAPTATION OF HYDRODYNAMIC MODEL OF PRODUCTIVE FORMATION OF OIL AND GAS CONDENSATE DEPOSIT TAKING INTO ACCOUNT UNCERTAINTY OF GEOLOGICAL STRUCTURE Russian patent published in 2019 - IPC E21B43/00 E21B49/00 

FIELD: machine building.

SUBSTANCE: invention relates to a method of adapting a hydrodynamic model taking into account uncertainty of a geological structure. Method includes geophysical, gas-dynamic, hydrodynamic investigations of wells, core sampling, petrophysical studies, generalization of materials on geological structure study, construction of a geological model of the deposit, determination of distribution of facies along the area of the deposit based on petrophysical and geophysical survey data, determination of minimum, maximum and most probable values of coefficients of sand content, porosity, oil and gas saturation, permeability, effective oil and gas-saturated thicknesses for each cell (block) of the three-dimensional model of the deposit, evaluation of geological indices in the inter-well space, calculation of development indices on the hydrodynamic model. Development parameters and permissible tolerances calculated for the hydrodynamic model are entered into the database of the automatic process control system (APCS) and / or information-control system (ICS). Actual development indices are monitored on instruments installed on wells, and results of these measurements are recorded in their data base. Deviation of design values from actually measured deviations is checked. Block of information on actual current and historical development indices is generated, which are transmitted via communication channels for additional processing. Three-dimensional distribution of calculation error of adapted development index is plotted by hydrodynamic model. Analytic relationship between geological parameters involved in adaptation and an adaptable development index is determined. Values of geological parameters for each cell (block) of the three-dimensional model are determined. Values of the specified parameters are checked for each cell. If the value of the geological parameter exceeds the limits of probabilistic deviations, the maximum or minimum probable value is assigned accordingly. Adaptation process for other cells (blocks) of the model is continued until the specified error is achieved. Refined calculation data are transmitted to APCS and / or ICS data base for further control over deposit development. If it is impossible to provide specified accuracy of calculation of parameters, geological parameters with the highest degree of uncertainty and high influence on development indices are determined. Field zones are determined with maximum error of development indices calculation and additional geophysical, petrophysical, hydrodynamic investigations are performed in identified zones of the deposit for local refinement of geological parameters, and based on the results of additional studies, a repeated procedure of adapting the hydrodynamic model is carried out, after which corresponding parameters are loaded into a database for further monitoring of development of the deposit.

EFFECT: minimization of calculation error of technological indices of deposit development with application of hydrodynamic models.

1 cl, 2 dwg, 1 tbl