METHOD TO OPEN AND DEVELOP MULTIPAY FIELD WITH LOW POROPERM RESERVOIRS Russian patent published in 2015 - IPC E21B43/00 

FIELD: oil and gas industry.

SUBSTANCE: according to the method, they drill a directional well with a well shaft ascending end. An operating string or a shank is lowered. The ascending section of the operating string is equipped with a filter. The "dead" part of the casing string is isolated from the filter one by a packer with a coupling of stepped cementing. At the same time in the gas well the sections of pay beds are opened with the specified zenith angle - first along the descending, and then along the ascending trajectory. Thus they achieve the maximum length of pay horizon opening and speed of gas flow. Drilling mud is applied on the basis of the emulsion of gas oil and water mixture. The well shaft is cased with the operating string equipped with a filter, in the descending and ascending section of the well shaft. In the lower part of the well shaft they form the area of accumulation of bed fluid, where they lower an oil string of lifting pipes, and they carry out joint operation of pay horizons. Fluid is removed due to speed of gas flow arriving from pay beds.

EFFECT: increased efficiency of development of tight gas resources in fields, deposits of which are presented by non-consolidated mudded reservoirs with high residual water saturation and low porosity and permeability properties.

1 ex, 1 dwg