INTERVAL TREATMENT METHOD OF BOTTOM-HOLE ZONE OF OIL-GAS WELL FORMATIONS (VERSIONS) Russian patent published in 2012 - IPC E21B43/27 

FIELD: oil and gas industry.

SUBSTANCE: as per one of versions of the methods productivity of formations or their interlayers and boundaries and distances between them are determined, acid compounds are selected for treatment of each formation of interlayer. After that, inflatable packer-plug is lowered to unplugged well through production tubing using a flexible pipe equipped with spring centraliser when distances between formations or their interlayers differ considerably. The above packer-plug is installed in the well below the bottom of lower formation or interlayer and packed. Then, flexible pipe is detached from inflatable packer-plug and moved to the surface. After that, inflatable packer is lowered to the well using flexible pipe equipped with spring centraliser, installed above roof of lower formation or interlayer and packed. After that, acid compound chosen for treatment of that formation of interlayer is pumped through flexible pipe to lower formation or intelrayer. Acid compound is forced to bottom-hole zone of lower formation or interlayer to the depth of colmatage zone, kept for the period of its reaction with colmatage particles contained in bottom-hole zone, gas inflow is induced from lower formation or interlayer, reaction products are removed together with gas via annular space between flexible pipe and tubing string till complete recovery of productivity of lower formation or interlayer, and well is performed with regard to flame. After that, inflatable packer is unpacked and removed from the well using flexible pipe. Then, catcher is lowered to the well using a flexible pipe, connected to inflatable packer-plug, unpacked and moved with catcher below bottom of above located upper formation or interlayer, packed; inflatable packer is lowered using flexible pipe equipped with spring centraliser, installed above roof of the above located upper formation or interlayer and packed, and similar acid treatment with acid compound selected for treatment of that formation or interlayer is performed.

EFFECT: increasing treatment efficiency.

2 cl, 2 dwg