METHOD FOR REPEATED MULTISTAGE HYDRAULIC FRACTURING WITH DIVERTING PACKS IN HORIZONTAL WELL Russian patent published in 2023 - IPC E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used as a method of increasing the productivity of production or injectivity of horizontal injection wells, namely as a method of repeated multi-stage hydraulic fracturing (MSHF) of an oil or gas formation in a horizontal well using packs of cross-linked fluid for dynamic deflection during the repeated MSHF. A method for carrying out repeated multi-stage hydraulic fracturing with deflection packs in a horizontal well includes lowering into the well a string of tubing with a packer in the mother casing, sealing the annular space between the casing and the tubing string and creating pressure in the sub-packer zone sufficient to initiate the 1st hydraulic fracturing (HF) crack by injecting hydraulic fracturing fluid into the well along the tubing string. After that, the created 1st crack is secured by pumping proppant into it. Depending on the number of required hydraulic fracturing operations, repeated hydraulic fracturing is carried out in several stages, but not less than two, to achieve the planned effect. Immediately before performing the stages of repeated hydraulic fracturing, verification of calculations is carried out to determine the number of places where hydraulic fracturing cracks are initiated through diagnostic injections. After running the tubing string into the well and sealing the annular space between the casing and the tubing string, the seats and balls of the couplings for the horizontal well liner assembly are milled using a set of flexible tubing. The created 1st fracture after pumping proppant into it is also secured by pumping cross-linked hydraulic fracturing fluid into it and packing a pack of cross-linked fluid with an encapsulated destructor for dynamic deflection of the 2nd, 3rd and subsequent stages of multi-stage hydraulic fracturing into subsequent zones of the horizontal wellbore to increase the sweep factor trunk stimulation. At each stage of multi-stage hydraulic fracturing, proppant and cross-linked fluid packs are injected in an amount not less than the total mass of injected proppant during the first hydraulic fracturing.

EFFECT: increases the reliability of repeated multi-stage hydraulic fracturing and oil production.

2 cl, 2 dwg