INSTALLATION FOR MUD-PULSE EFFECT ON BOTTOMHOLE FORMATION ZONE Russian patent published in 2014 - IPC E21B28/00 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: installation for a mud-pulse effect on a bottom-hole formation zone includes a production string filled with a working fluid and connected to a hydraulic actuator from below that communicates with an annular space. The same installation includes a piston supported by a pull-back spring, an implosion chamber equipped from below with a spring-operated valve that passes the flow in the top-downward direction. The implosion chamber is made inside the hydraulic actuator. The hydraulic actuator is equipped with a side, upper, medium and lower rows of openings, at that in the hydraulic actuator over the implosion chamber there is a solid partition dividing the upper and medium rows of radial openings. In the upper part of the hydraulic actuator over the solid partition there is an auxiliary spring-operated valve that passes the flow in the top-downward direction. The piston is made annular, it is placed outside the implosion chamber and supported by the pull-back spring from below; it covers the side and medium rows of the radial openings in the initial position. In the operating position the piston under excess pressure of the fluid in the production string is capable of axial movement in a downward direction and a possible combination of the production string annular space with the bottomhole formation zone by means of the side and medium rows of the radial openings in the hydraulic actuator and the implosion chamber. At that the hydraulic actuator is equipped with a packer from the outside.

EFFECT: improving efficiency of the mud-pulse effect on the bottomhole formation zone, reducing hydraulic pressure in the process of the installation operation and increasing its operational life.

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