METHOD OF PRODUCTION STRING SEALING Russian patent published in 2014 - IPC E21B33/138 

FIELD: oil and gas industry.

SUBSTANCE: method of production string sealing includes run in hole of the production pipe string. Two components of a waterproof sealant are injected in sequence through the pipe string with their separation by plugs, at that the first component is lifted from the pipe string at its output through annular space. Thereafter they are injected jointly to the interval of the production string failure by displacing unit through tubing volume and annular space. At that the production string is equipped with a packer from outside before run in hole and with a body above the packer, at that the body is interconnected with the pipe string and through a spring-loaded valve passing from outside to inside with annular space. At that after the first component lifting through annular space the latter is packed with the packer above the failure interval with specific injectivity from 0.5 up to 2.0 m³/(h·MPa). Moreover, while injecting jointly components of the waterproof sealant the first component from annular space is injected in order to mix them gradually in required proportion through spring-loaded valve and body to the second component injected through annular space.

EFFECT: improving efficiency of remedial cementing at production string sealing.

1 tbl, 1 dwg