METHOD OF SEARCHING FOR PROBLEM WELLS OF OIL DEPOSIT FOR PERFORMING THEIR STIMULATION BY METHODS OF BOTTOM-HOLE TREATMENT OR FRACTURING Russian patent published in 2017 - IPC E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the selection of wells with a colmated bottom-hole formation zone (BFZ). The method includes geophysical surveys of wells, as well as laboratory studies of the core, systematic measurement of oil, liquid flow rate. Hydrodynamic studies are performed in wells to identify wells with an increased skin factor. In this case, graphical correlation of the current values of actual well fluid rate (Y axis) and its potential index (X axis) is used to search for problem wells with a colmated BFZ, which considers all the development wells of the deposit, which are put into operation in one period of time. In this case, the well potential index is calculated as the product of the values of the initial entered formation oil pay, the average permeability of the BFZ, the difference between the current formation pressure and the down-hole pressure divided by the viscosity of the produced fluid in the formation conditions, and the viscosity of the produced liquid is calculated as the arithmetic mean of the viscosity of the oil and water in the formation conditions, taking into account their content in products. Problem wells with probable colmatation of the BFZ are wells which points are located at the correlation which is much lower than the straight line interpolating point that are subject to direct dependence of the well fluid rate on its potential index. In this case, for the noted problem wells, the dynamics of the fluid, oil and water rates over the last period of operation are generated and only those problematic wells are selected for the treatment of the bottomhole zone (BHZ), for which the drop in the liquid rate is accompanied by a drop in oil production rate.

EFFECT: increased accuracy of the search.

2 cl, 3 dwg