Multilateral well fracturing window sealing tool and process

Abstract

The invention relates to the technical field of oil field multilateral wells, in particular to a multilateral well fracturing window sealing tool and a process. The upper end of a feeding pipe of the device is connected with a feeding pipe joint; an inner center pipe is coated at the outer side of the feeding pipe, and is locked through a hand release locking block; a spherical base is connected to the inner wall of the feeding pipe through a hand release pin, and stops the hand release locking block; the inner wall of the bottom end of the feeding pipe is connected with a stop sleeve; an outer center pipe is coated at the outer side of the inner center pipe, and is locked through a locking block; a unsealing outer cylinder is connected to the outer side of the outer center pipe; and an insertion cylinder is connected to the inner wall of the unsealing outer cylinder through a unsealing pin. The tool realizes effective sealing of a main shaft at the upper part of a window and a non-fracturing multilateral borehole at the lower part to prevent a fluid in the multilateral borehole from entering the main shaft to cause the well control risk.

Description

Technical field: [0001] The invention relates to the technical field of oil field branch wells, in particular to a branch well fracturing window sealing tool and technology. Background technique: [0002] The branch well technology can effectively increase the drilled area of ​​the reservoir and thus increase the oil and gas production. It is an effective way to increase the production of oil and gas wells. As domestic oil fields gradually enter the late stage of development, the production of single wells decreases year by year, and reserves that are difficult to develop such as low-permeability oil and gas reservoirs, etc. More and more attention has been paid to it. For low-permeability reservoirs, fracturing must be performed to improve the permeability of oil and gas layers near the wellbore. For the fracturing of branch wells, when one wellbore is fractured, the oil and gas in the other branch wellbore will It is easy to enter the main wellbore through the window tee, ...

AI Technical Summary

Problems solved by technology

[0002] The branch well technology can effectively increase the drilled area of ​​the reservoir and thus increase the oil and gas production. It is an effective way to increase the production of oil and gas wells. As domestic oil fields gradually enter the late stage of development, the production of single wells decreases year by year, and reserves that are difficult to develop such as low-permeability oil and gas reservoirs, etc. More and more attention has been paid to it. For low-permeability reservoirs, fracturing must be performed to improve the permeability of oil and gas layers near the wellbore. For the fracturing of branch wells, when one wellbore is fractured, the oil and gas in the other branch wellbore will It is easy to enter the main wellbore through the window tee, which has a greater risk of well control

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