SEPARATION METHOD OF HORIZONTAL WELL INTO INDIVIDUAL SECTIONS Russian patent published in 2015 - IPC E21B33/10 

FIELD: oil and gas industry.

SUBSTANCE: separation method of a horizontal well into individual sections involves determination by means of geophysical investigations of length and location of separation zones, lowering by means of a pipe string of shaped separators with cylindrical ends, each of which is arranged between upper and lower stops. Distance between the separators is chosen according to location and lengths of separation zones. Excess pressure is created inside the separators for their pre-straightening and fixation at the installation interval. Final extension of the separators is performed in a downward direction by a roller-type rolling device with an adjustable diameter. Prior to lowering, upper and lower stops the outside diameter of which is by 2-3% smaller than the inside diameter of cylindrical ends of the separators are tightly inserted into the separators on both sides. On the shaped part of the separators there arranged are sealing elements so that at extension of the separator by the rolling device there can be no shutoff throughout the length of the sealing elements for sealing of the inner space of the well. Sealing elements from harder and more wear-resistant material are located in the middle shaped part of the separator.

EFFECT: invention allows more reliable separation of a horizontal well shaft into individual sections.

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