WELL FORMATION DEVELOPMENT DEVICE Russian patent published in 2015 - IPC E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: well formation development device includes a swab, a tubing string with a swab limit stop and a filter for interaction with the formation and a packer installed above the formation. The tubing string above the packer, but below the swab limit stop is provided with a row of through holes. When in an initial position, the holes are tightly covered with a hollow sleeve for a discharge shutoff element. The shutoff element has a possibility of leak-proof fit and fixation in the hollow sleeve, as well as a possibility of restricted axial movement together with the hollow sleeve down against stop into an internal annular recess of the tubing string under action of created excess pressure in the tubing string with further fixation of the hollow sleeve with a spring-loaded split stop ring in notches for interaction of the inner space of the tubing string with the above-packer zone after discharge of the shutoff element. Notches are made on the inner surface of the tubing string. The shutoff element is made in the form of a stepped blind cylinder, the upper diameter (Ds) of which is larger than the inner diameter of the hollow sleeve (d), but is less than the inner diameter of the swab limit stop (D).

EFFECT: simpler design of the device and shorter development period of the well.

4 dwg