PACKER FOR CREATION OF GRAVEL FILTER Russian patent published in 2015 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: packer for creation of the gravel filter includes cross-over unit containing the nipple with side holes blocked by a bushing moving along the nipple, the sealing unit comprising the sealing collar with anchoring devices, the core enclosing the collar and located inside the guiding bushing and the pre-coat unit containing a slide valve. The core and the guiding bushing are implemented with a possibility of compression of a sealing collar at their shift with reference to each other. Also the packer contains the pre-coat tube leaning by end face on the end face of the housing of the slide valve of the pre-coat unit and passing inside the core of the sealing unit and inside the nipple of cross-over unit with a possibility of formation of through passage channel in the packer. The pre-coat unit also contains the insert with pre-coat windows located between the external surface of the housing of the slide valve and the internal surface of the cylindrical base with pre-coat windows. On the lateral surface of the housing of the slide valve two rows of process holes are implemented, and process holes of one of rows are located opposite to the process holes implemented in the insert which is rigidly fastened to the cylindrical base. Pre-coat windows of the base are located opposite to pre-coat windows of the insert. From the one side the insert encloses the face part of the pre-coat tube, and from the other side it has the through hole the diameter of which is less than the diameter of the pre-coat tube. And the through hole is implemented with a possibility of installation in it of the flushing tubes used in the assembly of configuration of the underground equipment for creation of the gravel filter.

EFFECT: improved device reliability.

6 dwg