METHOD TO DETERMINE ACCURACY OF WELL ISOLATION OPERATION Russian patent published in 2015 - IPC E21B47/05 E21B33/14 

FIELD: oil and gas industry.

SUBSTANCE: method is suggested to determine whether well isolation operation is made accurately, and it includes the following stages: tubular casing is placed in the well borehole with at least one pressure sensor contained in its wall and faced to circular area concluded between outer surface of the above tubular casing and inner surface of the well borehole or between outer surface of the above tubular casing and inner surface of the other tubular casing containing the above tubular casing; well isolation operation is carried out in the above circular area, at that during operation performance a packer is set in the circular area so that the packer sealing component is thrust hermetically into the casing pipe with the above tubular casing or to the wall of the well borehole. Further the method includes the stage whereat pressure of fluid in the circular area is controlled during well isolation operation by means of the pressure sensor and data on fluid pressure in the circular area downstream the well borehole in regard to the sealing component are transmitted, at that pressure drop detected with time in the circular area downstream the well borehole in regard to the sealing component specifies available loss behind the packer. The tubular casing used for the method implementation is also described.

EFFECT: control of the packer setting in the well is provided.

41 cl, 12 dwg