Magnesium-based metal-soluble bridge plug

Abstract

The invention discloses a magnesium-based metal-soluble bridge plug. The magnesium-based metal-soluble bridge plug comprises a central tube, a releasing shear nail, a spacer ring, an upper slip, an upper conical body, a rubber cylinder, a protective ring, a lower conical body, a lower slip, a base and an anti-blocking pattern tube; the spacer ring, the upper slip, the upper conical body, the rubber cylinder, the protective ring, the lower conical body and the lower slip separately sleeve the central tube from top to bottom in sequence, and the base is connected with the central tube through anexternal thread of the lower end of the central tube; the upper end of an outer setting cylinder is connected with an ignition setting tool through a T-shaped thread. Compared with the prior art, themagnesium-based metal-soluble bridge plug has the advantages that a magnesium-based soluble metal material is adopted, and the dissolution performance is reliable; an upper-and-lower bidirectional integral slip structure is adopted, the integral slip junction is broken when the thrust reaches 2-3 t, and the slips are opened; slip teeth adopt combinations of ceramic particles and alloy particles to ensure an anchoring effect and an anchoring force; the base has an anti-rotation structure design, and the plug is drilled conveniently when plug drilling is needed in a short time due to sand blockage or complicated well bottom conditions.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to a magnesium-based metal soluble bridge plug. Background technique [0002] With the good results in the development of shale gas and low-permeability oil and gas reservoirs, the staged fracturing technology of horizontal wells has become the main technology for the production stimulation and development of unconventional resources such as shale gas, low-permeability oil and gas, and coalbed methane. As one of the important tools for staged fracturing, bridge plugs are increasingly widely used. Among them, the soluble bridge plug can be completely dissolved in the flowback fluid after fracturing, saving drilling and grinding costs, realizing rapid production, and the wellbore can achieve full diameter, reducing operation risks; however, many limitations have also been found in a large number of on-site constructions This restricts the further popularization...

AI Technical Summary

Problems solved by technology

Among them, the soluble bridge plug can be completely dissolved in the flowback fluid after fracturing, saving drilling and grinding costs, realizing rapid production, and the wellbore can achieve full diameter, reducing operation risks; however, many limitations have also been found in a large number of on-site constructions Restricted the further popularization and application of this technology

After long-term on-site tracking and analysis, at present, domestic soluble bridge plugs mainly have problems such as premature failure and insolubility after pressing, which greatly limit the popularization and application of this technology

Analysis of the root cause of the above problems is that the materials, structures and construction techniques of soluble bridge plugs are poorly compatible with different well conditions; and this technology has a strong selectivity to well conditions, and it is difficult to solve the problem of soluble bridge plug materials, structures, etc. The matching of technology and different well conditions is the key to the technology

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