High-ductility small-diameter dissoluble bridge plug

Abstract

The invention discloses a high-ductility small-diameter dissoluble bridge plug. The high-ductility small-diameter dissoluble bridge plug comprises a setting outer barrel, a connector, a central pipe,a releasing shear pin, a spacer ring, a starting shear pin, an upper slip, slip particles, an upper cone, an anti-rotation pin, a protection ring, a packer rubber assembly, a lower cone, a lower slipand a base. Except a packer rubber, the other body materials of the dissoluble bridge plug are made of high-elongation soluble metal magnesium-based alloy, the elongation of the soluble metal magnesium-based alloy is larger than 30%, the yield strength is not smaller than 280 MPa, the hardness is larger than 60 HB, and the dissolution rate in a KCl solution with the mass percent concentration of 3% at 93 DEG C reaches 70 mg/h.cm<2>. The inner surfaces of the upper cone and the lower cone are designed to be sawtooth-shaped, so that the roughness of the inner surfaces of the cones is increased,and axial locking of the dissoluble bridge plug after setting is guaranteed. The high-ductility small-diameter dissoluble bridge plug is used for plugging measures in the fracturing process, the bridge plug can be completely dissolved in a shaft after fracturing construction is completed, the full diameter of the shaft is achieved, and convenience is provided for follow-up construction.

Description

technical field [0001] The invention relates to a dissolvable bridge plug tool for fracturing operations in the technical field of oil and gas field exploitation, in particular to a dissolvable bridge plug with high ductility and small diameter. Background technique [0002] At present, in the field of oil and gas well fracturing and stimulation technology, composite bridge plugs are generally used for plugging and fracturing. Drilling requires a lot of time and cost, and it is time-consuming and laborious. In addition, if the horizontal section of the oil and gas well is too long, it cannot be drilled effectively, which has certain limitations. [0003] The development of soluble bridge plugs can reasonably and effectively solve the above problems. After the fracturing is completed, the soluble bridge plugs can be completely dissolved in the flowback fluid, and the full diameter of the wellbore can be realized without drilling and removal operations, saving drilling and gri...

AI Technical Summary

Problems solved by technology

However, with the popularization and use of soluble bridge plugs in the field, some application limitations have been gradually discovered, mainly because the soluble bridge plugs are not firmly set, and the premature unsealing fails, etc.

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