Ball seat suitable for acidification of ultra-deep carbonate rock gas reservoir and use method of ball seat

Abstract

The invention discloses an acidizing ball seat suitable for an ultra-deep carbonate rock gas reservoir and a using method thereof.The acidizing ball seat comprises a ball seat body, an acidizing channel and a ball receiving shaft core, the ball seat body is arranged at the bottom of a packer, a main channel communicated with a center pipe of the packer is arranged in the ball seat body, a reducing part is arranged in the main channel, and the ball receiving shaft core is in a funnel shape; the fitting reducing part is arranged in the main channel and can coaxially move up and down along the main channel in the ball seat body, and the acidification channel is arranged on the inner wall of the ball seat body, communicates the main channel with a shaft annulus and is movably shielded by the ball seat body; when in use, the ball seat is mounted at the bottom of a K344 packer, the ball seat and the K344 packer are tripped into a fractured well together, the packer is allowed to carry out slurry reverse replacement when acid fracturing is not carried out, and a setting ball is put into the ball seat for pressurization when fracturing operation is carried out, so that an acidification channel is opened, acid fracturing is carried out smoothly, and smooth acidification construction is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering, and specifically relates to a ball seat suitable for acidification of ultra-deep carbonate gas reservoirs and a method for using the same. Background technique [0002] In recent years, the proportion of ultra-deep carbonate rock exploration and development has increased year by year. Due to the characteristics of deep burial, low porosity and low permeability of ultra-deep carbonate rock, and the influence of drilling fluid and plugging mud during drilling, ultra-deep carbon The fracture pressure of salt rock is very high, and the fracture pressure is above 170-180MPa, which brings great challenges to the success rate of reservoir stimulation. For ultra-deep carbonate reservoirs, the stimulation mode is generally divided into perforation-acidification-test triple operation and acidification-test double operation. The triple operation process is adopted, because the perforation gun ...

AI Technical Summary

Problems solved by technology

However, at present, during the acidizing construction of the K344 packer, the acid absorption capacity of the formation is low, and the problem of unsealing often occurs, and it is extremely difficult to achieve secondary setting, resulting in a rapid increase in annular pressure, and the acidizing construction cannot be carried out normally.

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