Three-layer separate injection string and three-layer separate injection method for oil well
A technology of pipe injection and oil pipe, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of complex procedures, complex structure, and failure of pipe strings of eccentric water distributors, so as to achieve fast and convenient water distribution and improve the efficiency of water distribution. Anti-blocking ability, the effect of prolonging the service life
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[0040] A three-layer injection pipe string and a three-layer injection method for oil wells of the present invention include an outer pipe assembly and an inner pipe assembly; the outer pipe assembly includes: a large-size oil pipe, a first expansion packer, and water distribution The inner pipe assembly includes: the small-sized oil pipe and the shunt inserting pipe; the shunt inserting pipe is fixedly connected from top to bottom in turn; the inner pipe assembly includes: the small-sized oil pipe, the second expansion packer, the constant pressure switch and the ball seat It can correspondingly abut on the sliding sleeve inside the diverter water distributor, and there is a gap between its non-inserted section and the cylinder of the diverter water distributor; the pipe string is lowered to a designated position in the set of pipes, A steel ball is placed on the ball seat; the setting pressure of the first expansion packer and the second expansion packer is less than the shear...
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