Self-sealing setting ball seat

Abstract

The invention discloses a self-sealing setting ball seat, which relates to the technical field of the manufacturing of underground packer tools in petroleum and natural gas industries. The invention provides the self-sealing setting ball seat, which adopts two-way sealing design and can realize the positive and negative sealing of a tubular column of an underground packer. The self-sealing setting ball seat comprises a self-sealing mechanism and a shell mechanism, wherein a self-sealing tube of the self-sealing mechanism is arranged in a self-sealing sleeve; four side holes are uniformly distributed at corresponding positions on the self-sealing tube and the self-sealing sleeve; and a shell of the shell mechanism is in threaded connection with a joint. The self-sealing setting ball seat solves the problem that only positive sealing can be performed in the prior art, and has the characteristic of the realization of positive and negative sealing in the construction of a high-pressure oil-gas well.

Description

Technical field: [0001] The invention relates to a self-sealing setting ball seat, which is used in the stimulation or well completion operation after drilling and completion of oil and gas wells, and relates to the technical field of manufacturing downhole packer tools in the oil and gas industry. Background technique: [0002] In oil and gas well stimulation or completion operations, it is necessary to run a string with one or more packers and set the packers to separate the well section that needs to be operated from the well section that does not need to be operated ; There are many ways to set the packer. When using the packer in oil and gas wells with high setting pressure, the setting ball seat is the most common way. The seat is installed below the packer in the tubing string; for the wells constructed with one-time tubing string, after the packer string is lowered to the design well depth, the killing fluid in the well is replaced, and then the setting ball is put i...

AI Technical Summary

Problems solved by technology

[0002] In oil and gas well stimulation or completion operations, it is necessary to run a string with one or more packers and set the packers to separate the well section that needs to be operated from the well section that does not need to be operated ; There are many ways to set the packer. When using the packer in oil and gas wells with high setting pressure, the setting ball seat is the most common way. The seat is installed below the packer in the tubing string; for the wells constructed with one-time tubing string, after the packer string is lowered to the design well depth, the killing fluid in the well is replaced, and then the setting ball is put into it. , place the setting ball on the setting ball seat, and then positively seal the circulation hole on the setting ball seat. At this time, pressurize into the pipe through the wellhead to set the packer, and then the construction operation can be carried out ; For wells where the drill pipe is used to send the packer string to the design position, and after it is separated from the packer string, the tubing string is used to tie back the packer string for construction. For wells constructed with strings, for wells constructed with secondary strings, during the period from when the drill pipe is separated to when the tubing string is connected back to the packer string, because the higher-density killing fluid has been lowered Density of the completion fluid is replaced, the pressure inside the pipe is lower than the pressure of the formation fluid outside the pipe, the oil and gas fluid in the formation will flow out, and then enter the upper pipe through the circulation hole on the setting ball seat to reach the wellhead, resulting in complex kicks or blowouts. situation; when this happens, it is not only required that the setting ball seat can block the circulation hole in a positive direction, but also can block the circulation hole in the reverse direction; at present, the setting ball seat at home and abroad only has the function of positive sealing, It realizes the setting of the packer, but does not have the function of reverse sealing. Therefore, when the complex situation of well kick or blowout occurs, the existing technology cannot realize the ability of reverse sealing. construction is very dangerous

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