A Fracturing Window Isolation Tool and Technology for a Branch Well

Abstract

The invention relates to the technical field of oil field branch wells, in particular to a branch well fracturing window sealing tool and technology. The upper end of the feeding pipe of the device is connected with the feeding pipe joint, and the outer side of the feeding pipe is fitted with an inner center pipe and locked by a locking block. The ball seat is connected to the inner wall of the feeding pipe through a locking pin and blocks the locking block. The inner wall of the bottom end of the feeding pipe is connected with a stopper, the outer side of the inner central tube is fitted with an outer central tube and locked by a locking block, the unsealed outer cylinder is connected to the outside of the outer central tube, and the return inserting cylinder is connected to the inner wall of the unsealed outer cylinder by an unsealed pin . The invention realizes the effective isolation of the main wellbore at the upper part of the window and the unfractured branch wellbore at the lower part, and prevents the well control risk caused by the fluid in the branch wellbore entering the main wellbore.

Description

[0001] Technical field: [0002] The invention relates to the technical field of oil field branch wells, in particular to a branch well fracturing window sealing tool and technology. [0003] Background technique: [0004] 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 t...

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Problems solved by technology

[0004] 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 the reserves that are difficult to develop such as low permeability oil and gas reservoirs, etc. More and more attention has been paid to it, and 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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