Rubber plug and well completion method for full-bore soluble sealed packing

Abstract

The invention discloses a rubber plug and a well completion method for full-bore soluble sealed packing. The rubber plug is made of a soluble elastic material and includes a plug body, an upper end cover, a lower end cover and a soluble ball; a plurality of holes are formed in both the upper end cover and the lower cover; the plug body is of a cylindrical shape, and an annular boss is arranged onthe outer wall of the plug body; the soluble ball is placed inside the plug body; the upper end cover and the lower end cover are correspondingly screwed on both ends of the plug body, and a ball seatis arranged, at the position adjacent to the lower end cover, inside the plug body. The well completion method for the full-bore soluble sealed packing comprises the following steps that (1) a casingstring is inserted; (2) well cementing, shutoff pressure and a first layer fracturing are performed; (3) a packing and fracturing string is inserted, the rubber plug is placed into the string for perforating, and fracturing is performed; (4) the step (3) is repeated for multiple times until all layers are fractured; (5) the rubber plug is dissolved to achieve the full-bore of a wellbore. The wellcompletion technology for the sealed packing does not require the corresponding seat sealing tool, the full-bore after the completion of the wellbore fracturing is achieved without drilling and plugging procedure, and the efficiency is improved.

Description

technical field [0001] The invention relates to the field of well completion engineering of unconventional oil and gas reservoirs, in particular to a full-diameter soluble sealing sealing rubber plug and a well completion method. Background technique [0002] With the continuous development of oil and gas resources, my country's conventional oil and gas resources have entered the middle and late stage of development. Statistics show that the total amount of unconventional oil and gas resources represented by shale gas in my country is much higher than the amount of conventional natural gas resources. The exploration and development of unconventional natural gas resources is an important direction for my country's future oil and gas resource development. [0003] Unconventional oil and gas reservoirs are generally characterized by tightness, low porosity and low permeability. Reservoir stimulation technology combined with pumping bridge plug and perforation is one of the mai...

AI Technical Summary

Problems solved by technology

The setting process of the bridge plug in this technology is to energize the cable to make the explosive in the setting tool explode to generate explosive force instantly, and then rely on the explosive force to push the center tube to realize the bridge plug setting. Failure to ignite or insufficient explosion resulting in unseated or poorly seated bridge plugs

In addition, after the fracturing is completed, coiled tubing drilling is required to remove the bridge plugs placed in each stage of fracturing. The construction risk is high, the efficiency is low, the operation cost is high, and the operation length is limited by the length of the coiled tubing.

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