METHOD FOR TREATMENT OF WELL BORE HAVING ANNULAR INSULATING SYSTEM Russian patent published in 2014 - IPC E21B43/22 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to usage of fluid for the well treatment. The method increasing productivity of formation through which the well passes includes introduction of fluid for treatment to the well which contains non-hydrated borated galactomannan gum (NBGG), at that more than one producing zone in the formation is isolated from the other area by fluid hardening for treatment of the well in order to increase productivity of the formation. The method increasing productivity of the hydrocarbon-bearing formation (MIPHBF) with the passing well has a lot of producing area and comprises the following stages: introduction of fluid containing (NBGG) close to the preset producing area for the purpose of well treatment; isolation of the preset producing area from other areas is made by hardening of the above fluid; perforation of the insulated preset producing area; and provision of hydraulic fracturing of the above well area by introduction of the disruptive fluid at pressure sufficient for fracturing of the preset perforated producing area. The MIPHBF method includes a cemented vertical well, has a lot of producing area and comprises the following stages wherein: a) the producing area of the well is perforated; b) hydraulic fracturing of the perforated producing area is made by introduction of disruptive fluid into it at pressure sufficient for fracturing of the above area; c) fluid for well treatment with NBGG is injected into a casing string above the specified area; d) isolation of the area specified in the stage c) by hardening of the fluid for well treatment; and e) repetition of the stages a)-d) in one or several producing areas of the cemented vertical well. The MIPHBF method contains the stages with introduction of the fluid for well treatment into annular space between a wall of the well bore and the casing string in the well bore, the fluid for well treatment containing borated guar, at that the casing string is equipped with a zonal isolation device; hardening of the fluid for well treatment; perforation of the isolated producing area inside the zonal isolation device; and provision of hydraulic fracturing of the isolated producing area by injection of disruptive fluid at pressure sufficient for fracturing of the isolated producing area. The MIPHBF method for a non-vertical well contains the following stages: a) the first packer is introduced to the well; b) a zonal component of the insulation device is introduced to the well close to the first packer; c) the second packer is introduced to the well until an area is formed which is limited by the zonal component of the insulation device, the first and second packers; d) the fluid for well treatment, which contains borated guar, is introduced for hardening and hermetic isolation of the area limited by the first and second packers from other areas in the well; e) hydraulic fracturing of the area isolated at the stage f) by injection of disruptive fluid to the area at pressure sufficient for hydraulic fracturing of the area; and g) repetition of stages from a) up to e) in another area of the well. Invention is developed in dependent claims.

EFFECT: improving efficiency of productive area blockage in the formation.

25 cl, 9 ex, 2 tbl, 7 dwg