Multi-phase down hole injector

Abstract

A multi-phase down hole injector related to a down hole tool for oilfield well drilling, has a shooting pipe, an axial hole disposed in the center of the shooting pipe, one end of the shooting pipe is connected to an ellipsoid guide, at least two housing seats sets are disposed along the shooting pipe, every housing seat set are disposed with at least two housing seats of radial symmetry, the inner ends of every housing seat is separately connected to the axial hole, every housing seat is disposed with a injection barrel by the base, and the explosive cavity is disposed between the base and the housing seat. The injected viscosity fluid can exert squeezing and shearing force to the rock to make the channel and breach smaller or eliminated.

1 . A multi-phase down hole injector, wherein includes a shooting pipe, an axial hole is disposed in the center of the shooting pipe, one end of the shooting pipe is connected to an ellipsoid guide, at least two housing seats sets are disposed along the shooting pipe, every housing seat set are disposed with at least two housing seats of radial symmetry, the inner ends of every housing seat is separately connected to the axial hole, every housing seat is disposed with a injection barrel by the base, and the explosive cavity is disposed between the base and the housing seat. 
     
     
         2 . A multi-phase down hole injector according to the  claim 1 , wherein the base is disposed in the inner end of the housing seat, while the injection barrel is disposed in the outer end of the housing seat; the inner end of the injection barrel is thread connected to the outer end of the base, the front end and the side wall of the injection barrel are separately disposed with hole connected to the injection barrel. 
     
     
         3 . A multi-phase down hole injector according to the  claim 1 , wherein the outer end of the injection barrel is protruded out of the shooting pipe surface, and the distance between the outer end of the injection barrel and the centre shaft of the shooting pipe is shorter than the distance between the maximum overall diameter of the ellipsoid guide and the centre shaft of the shooting pipe. 
     
     
         4 . A multi-phase down hole injector according to the  claim 1 , wherein both ends of the shooting pipe are disposed with pin thread and box thread of coupled to each other. 
     
     
         5 . A multi-phase down hole injector according to the  claim 4 , wherein the guide is thread connected to the shooting pipe. 
     
     
         6 . A multi-phase down hole injector according to the  claim 1 , wherein every housing seat sets has three housing seats  14  of radial symmetry, the housing seat is stepped hole, the inner end of which is small hole, the small hole is connected to the axial hole  13  each, the extending of the small hole outwards is centre hole, and the outer end is big hole; the base is disposed inside the housing seat, and positioned by the lower surface of the big hole; the injection barrel is disposed on the base, the explosive cavity is disposed between the base and the housing seat. 
     
     
         7 . A wellbore wall strengthening methods adopted with the multi-phase down hole injector according to the  claim 1 , wherein includes steps below:
 Explosive loading: put the rubber pipe into the injection barrel of the multi-phase down hole injector of the present invention, install the explosive into the explosive cavity; set the critical cable inside the centre axial hole of the shooting pipe, connect one end of the critical cable to the explosive inside the explosive cavity, lead the other end to the explosive actuator;   Down hole: put the ellipsoid guide faced downwards; connect the shooting pipe to the drill pipe to let the shooting pipe with explosive down hole;   Detonating: when the shooting pipe reaches to the preset position down hole, light the critical cable to detonate the explosive charge by the liquid in the drill pipe forcing the explosive actuator or by the surface explosive actuator controller, the injection barrel injects into the wellbore by the explosive, and the viscosity fluid pipe is broken crowded by the rock, the viscosity fluid is entered into the rock crack to strengthen the wellbore.