Bore-hole jet device for formation hydraulic fracturing and...

F - Mech Eng,Light,Heat,Weapons – 04 – F

Patent

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Details

F04F 5/54 (2006.01) E21B 47/00 (2006.01)

Patent

CA 2701885

The inventive device comprises a jet pump (2) and a packer (3). The body (4) of the pump (2) comprises a nozzle (5) and mixing chamber (6) with a diffuser (7), which are coaxially arranged therein, and a stepped through channel (8) which is made therein, tapers from the top downward and is provided with a seat (9) between the steps. The channel (8) is made coaxially with a pipe string (1) and is coupled thereto. Each of the channels (10, 11) for supplying pumped from the well and active media is provided with a return valve (13, 14) and a restrictor (15, 16) for limiting the displacement of the locking member (17, 18) of the return valve (13, 14) upward with respect to the seat (19, 20) thereof. A sealing unit (21) in the form of a hollow stepped body with a sealing element (22) can be arranged in the through channel (8). An axial channel (23) for passing a rigid logging cable (24) with a well- logging instrument (25) is made in the sealing element (22). A guiding separation bush (26) which is cantilever fitted by the top end thereof to the top part of the body (4) of the pump (2) is mounted above the channel (8) axially thereto in the body (4) of the pump (2). Longitudinal slotted orifices (27) are made in the wall of the separation bush (26). The invention makes it possible to improve the reliability of the device and to optimise the sequence of operations during the well test.

Le dispositif de l'invention comprend une pompe à jets (2) et un packer (3). Le corps (4) de la pompe (2) comprend une buse (5) et une chambre de mélange (6) avec un diffuseur (7), disposés coaxialement, et un canal traversant étagé (8) qui se rétrécit du haute en bas et comprend un siège (9) entre les étages. Le canal (8) est disposé coaxialement avec une colonne de tubage (1) et communique avec elle. Des canaux (10, 11) pour amener le milieu évacué du puits et le milieu actif comportent chacun une soupape anti-retour (13, 14) et un limitateur (15, 16) servant à limiter le déplacement d'un organe de verrouillage (17, 18) de la soupape anti-retour (13, 14) vers le haut par rapport au siège (19, 20). Une unité d'étanchéité (21) se présentant comme un corps creux étage avec un élément d'étanchéité (22) peut être montée dans le canal traversant (8). Un canal axial (23) destiné à faire passer un câble de diagraphie rigide (24) avec un outil de diagraphie de fond de puits (25) est fait dans l'élément d'étanchéité (22). Une douille de séparation de guidage (26) est fixée en cantilever par son extrémité supérieure à la partie supérieure du corps (4) de la pompe (2), au-dessus du canal (8), dans le corps (4) de la pompe (2). Des orifices longitudinaux en fente (27) sont faits dans la paroi de la douille de séparation de guidage (26). L'invention permet d'améliorer la fiabilité du dispos

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