METHOD OF INCREASING WELL BOTTOMHOLE RESISTANCE TO DESTRUCTION Russian patent published in 2020 - IPC E21B43/00 E21B43/12 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used to improve stability of reservoir rock in bottomhole zones of wells to destructive loads developing during operation of wells at oil and gas fields, as well as during operation of wells at underground gas storages (UGS). Prior to running of casing string in zone of contact of productive formation with its impenetrable roof it is proposed to drill or blur cone-shaped cavern with vertex facing the formation, wherein the cavity parameters must satisfy the conditions according to which the depth of the cavity counted from the well wall along the contact line of the productive formation and its impermeable roof should exceed 4 cm, and the angle between the cone generatrix and the casing pipe generatrix should be within the range of values from 5° up to 30°.

EFFECT: increasing well bottomhole zone stability to destructive loads developing in process of its operation and, accordingly, reduction of volumes of broken rock carried to well bore.

1 cl, 2 dwg