Soluble bridge plug

Abstract

The invention relates to a soluble bridge plug for petroleum and natural gas exploitation, comprising a mandrel, a soluble ball, a guide shoe fixedly mounted at the bottom of the mandrel, and a seal system, an anchor system and a push ring sleeving the mandrel; the seal system comprises a glue barrel, upper and lower cones identical in structure and mounted at two ends of the glue barrel, and a protective ring assembly; the anchor system comprises upper and lower slip assemblies identical in structure and mirror-symmetrically mounted on outer conical surfaces of the upper and lower cones; the upper and lower slip assemblies each comprise a single slip and a slip hoop clamped to the single slip; at least one ceramic particle is embedded in the outer wall of each single slip, the outer surface of the ceramic particles is higher than the outer walls of the single slips, the raised portions of the ceramic particles are of slant structure, the lowest points of slants are flush with the outer walls of the single slips or lower than the outer walls of the single slips. Since soluble metal materials and / or degradable technologies are employed, the soluble bridge plug is short of a grinding milling step, takes less operating time and provides better protection for an oil-gas reservoir when compared to a traditional fracturing bridge plug.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a soluble bridge plug which can be automatically unblocked and degraded without drilling and milling after a fracturing operation. Background technique [0002] Among the proven oil and gas reserves in recent years, the proportion of low-permeability reserves has increased year by year. Low permeability oil and gas reservoirs have low permeability, low porosity, and strong heterogeneity. Most oil and gas wells must implement fracturing stimulation measures before they can see productivity. The role of fracturing stimulation technology in the development of low permeability oil and gas reservoirs is becoming more and more obvious. [0003] Since the world's first well fracturing test was successfully carried out in the Houghton Oilfield of Kansas in the United States in 1947, after more than 60 years of development, fracturing technology has developed ra...

AI Technical Summary

Problems solved by technology

[0005] At present, oil and gas fields at home and abroad mostly use composite bridge plugs or large-diameter bridge plugs. This kind of process requires grinding and milling operations in the later stage. The process will cause time and cost consumption, and the use of soluble bridge plugs can well avoid these problems

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