Single-slip large-diameter drilling-grinding-free composite bridge plug and setting method thereof

Abstract

The invention discloses a large-diameter composite bridge plug which comprises a setting pull rod, an upper cone, a central pipe, a lower cone, a rubber cylinder assembly, a one-way integral slip, a guiding shoe head and a soluble fracturing ball. The upper cone, the central pipe, the lower cone and the guiding shoe head are sequentially mounted on the setting pull rod in a sleeving mode, the upper cone is connected with one end of the central pipe, and the end, close to the threaded end of the setting pull rod, of the upper cone is provided with an inward-sunken conical face matched with thesoluble fracturing ball; the end, connected with the central pipe, of the upper cone is in a conical shape, the lower cone is connected with one end of the central pipe through a thread, the other endof the lower cone is connected with one end of the guiding shoe head, and the central pipe is sleeved with the position between the upper cone and the lower cone, wherein the position is provided with the rubber cylinder assembly; and the guiding shoe head is provided with an abutting part, and the one-way integral slip is arranged between the lower cone and the abutting part of the guiding shoehead. According to the large-diameter composite bridge plug, drilling grinding is not needed, and the soluble fracturing ball is completely dissolved to provide an oil and gas production channel for awellbore.

Description

technical field [0001] The invention relates to oil and gas drilling equipment, in particular to a single-slip large-diameter drilling-free composite bridge plug and a setting method thereof. Background technique [0002] The bridge plug is a downhole tool specially used for oil and gas well sealing, which has the characteristics of less construction procedures, short cycle time, and accurate sealing position. In well completion and oil testing construction, it is mainly used to seal abandoned formations or special formations such as dry layers, water layers, gas layers and abnormally high pressure layers. provide assurance. [0003] With the development of unconventional oil and gas resources, multi-stage fracturing technology has been widely used due to its simple construction string and few restrictions, and the composite bridge plug, one of its supporting tools, has been widely used, because the main structure Composite materials are used, so the bridge plug can be qui...

AI Technical Summary

Problems solved by technology

[0005] With the deepening of the development of unconventional oil and gas resources, especially the increase in the depth of shale gas development wells and the extension of the length of the horizontal section, after the fracturing operation is completed, the drilling and grinding of the bridge plug cannot be completed due to the limitation of the length of the coiled tubing. In addition, if the coiled tubing travels too long in the horizontal section, "self-locking" will occur, which will also affect the drilling and grinding operation of the bridge plug, resulting in the inability of subsequent normal production of oil and gas wells.

When the existing composite bridge plug technology is applied to deep wells and wells with large horizontal sections, it will become more and more difficult to drill and grind bridge plugs. Therefore, it is urgent to develop a bridge plug that does not require drilling and grinding and does not affect the normal production of oil and gas wells.

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