A multifunctional setting ball seat and its application method

Abstract

The invention discloses a multi-functional setting ball base and a using method thereof. The multi-function setting ball base comprises an upper connecting head, a lower connecting head, a setting ball base body and a check valve, wherein the setting ball base body and the check valve are arranged in the upper connecting head and the lower connecting head. A balancing hole is formed in the upper connecting head. The lower connecting head is provided with a liquid inlet throttling channel. The lower connecting head is internally provided with a sliding switch used for controlling opening and closing of the liquid inlet throttling channel. The bottom of the lower connecting head is provided with a guiding pressure hole. The upper connecting head and the lower connecting hole are connected through threads. The multi-functional setting ball base is arranged at the bottom of a CO2 driving injecting pipe column which adopts a permanent packer so as to achieve down-hole well shutdown operation. According to the multi-functional setting ball base, oil casing pressure balancing can be achieved during down drilling, after drilling tools are set well, the packer can be set-sealed, and the down-hole well shutdown operation can be achieved during pulling.

Description

technical field [0001] The invention belongs to the technical field of drilling and completion in oil and natural gas development, and specifically relates to a CO 2 A multifunctional setting ball seat for flooding injection string and its application method. Background technique [0002] in CO 2 Flooding injection strings often need to be able to balance the oil casing pressure during the drilling process. After the string is lowered in place, it has the function of setting a packer. Using the setting ball seat and the check valve, however, the combination of the conventional setting ball seat and the check valve tool will cause the above functions to be unable to be realized at the same time: 1. After setting the packer, the setting ball seat needs to be removed, but this It will affect the normal operation of the lower check valve; 2. The check valve will cause the casing pressure to be higher than the oil pressure during the tripping process, and the pipe string will f...

AI Technical Summary

Problems solved by technology

[0002] in CO 2 Flooding injection strings often need to be able to balance the oil casing pressure during the drilling process. After the string is lowered in place, it has the function of setting a packer. Using the setting ball seat and the check valve, however, the combination of the conventional setting ball seat and the check valve tool will cause the above functions to be unable to be realized at the same time: 1. After setting the packer, the setting ball seat needs to be removed, but this It will affect the normal operation of the lower check valve; 2. The check valve will cause the casing pressure to be higher than the oil pressure during the tripping process, and the pipe string will float in the wellbore fluid, making it difficult to run in; 3. The reliability of the single-stage check valve sex needs to be improved

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