EXPRESS METHOD FOR FIXING NATURAL AND ARTIFICIAL CRACKS IN BOTTOM-HOLE ZONE OF PRODUCTIVE FORMATION DURING THE INITIAL OPENING BY HORIZONTAL, INCLINED OR VERTICAL DRILLING Russian patent published in 2021 - IPC E21B33/10 E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, namely to technology of construction of deep wells, oil and gas production, in particular to the methods for primary opening with horizontal, inclined, vertical trunks of an oil and gas-saturated terrigenous and carbonate reservoir with normal, abnormally low and abnormally high reservoir pressures (ALRP and AHRP). The proposed express method for fixing natural and artificial cracks in the bottom-hole zone of a productive formation during the initial opening by horizontal, inclined or vertical drilling includes the initial opening of a productive formation by drilling. At the same time, after every 30-50 m, an additional repression is created on the previously drilled interval by reducing the area of the annular space with the help of an adjustable column packer included in the layout of the bottom of the drill pipes 30-50 m from the bit, and by increasing the flow of the washing liquid. Moreover, in the event of absorption of the washing liquid of more than 15-20 m³/hour, the acid-resistant proppant is pumped in the calculated volume in this interval of the borehole. At the same time, if the bottom-hole pressure begins to increase, the injection is stopped. After the operation, the packer is deactivated, the flow rate of the washing liquid is reduced to operating values. Next, a viscous acid-soluble colmatation pack is pumped into the absorption zone interval through the circulation to reduce the absorption intensity, then the next interval of the productive reservoir is drilled, the whole algorithm is repeated from the beginning.

EFFECT: preservation of the filtration properties of the terrigenous and carbonate deformable fractured reservoir with a decrease in reservoir pressure, the possibility of creating large depressions during the operation of the reservoir, field, deposits without the negative consequences of irreversible loss of well productivity.

1 cl, 3 dwg