Single-slip large diameter bridge plug and setting method thereof

Abstract

The invention relates to petroleum drilling exploitation equipment, in particular to a single-slip large diameter bridge plug comprising an upper connector, a one-way gear whole slip, a central pipe, a rubber cylinder, a conic body and a guiding shoe. The central pipe is of an axial hollow structure, and the outer wall of the central pipe is sleeved with the rubber cylinder. The cross section of the bottom of the conic body is conic, and the conic body is wedged into a gap between the one-way gear whole slip and the central pipe. An inner cavity of the upper portion of the central pipe is provided with a variable-diameter cavity for placing a soluble ball. The inner diameter of the variable-diameter cavity is decreased from top to bottom. Four grooves are uniformly formed in the lower end of the central pipe. Bosses matched with the grooves are arranged inside the one-way gear whole slip in the circumferential direction and inside the lower end of the guiding shoe in the circumferential direction. The soluble ball can be dissolved in an electrolyte solution. Meanwhile the invention discloses a setting method of the single-slip large diameter bridge plug. Drilling-grinding is not needed, and the soluble ball can be fully dissolved only by injecting the electrolyte solution, so that the large diameter of the bridge plug is reserved for using in subsequent production.

Description

Technical field [0001] The invention relates to an oil drilling equipment, in particular to a single slip large diameter bridge plug and a setting method thereof. Background technique [0002] At present, the split-layer fracturing of unconventional oil and gas is mainly based on the staged fracturing of composite bridge plugs. However, after the composite bridge plug setting perforation and fracturing is completed, a one-time drilling and grinding is required in the later stage, which is still time-consuming; As the depth of unconventional oil and gas production increases, especially in ultra-deep wells or inclined wells, it is more and more difficult to drill and polish with coiled tubing. Therefore, there is an urgent need to develop a bridge plug that does not require drilling and polishing for horizontal well segmentation. fracture. Summary of the invention [0003] The purpose of the present invention is to overcome the above shortcomings and provide a single slip large dia...

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Problems solved by technology

[0002] At present, the layered fracturing of unconventional oil and gas is mainly based on the staged fracturing of composite bridge plugs. As the depth of unconventional oil and gas production increases, especially in ultra-deep wells or deviated wells, it is becoming more and more difficult to use coiled tubing to drill and grind. Therefore, it is urgent to develop a bridge plug that does not require drilling and grinding for horizontal well segmentation. fracture

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