Separated pressure-bearing clogging device for downhole pipe string and using method thereof

Abstract

The invention discloses a separated pressure-bearing clogging device for a downhole pipe string and a using method thereof, and belongs to the technical field of oil and gas exploitation. According to the separated pressure-bearing clogging device for the downhole pipe string and the using method thereof, a downhole pipe string body is included, a pressure-bearing clogging device body is arranged in the downhole pipe string body, an overhead plunger block is arranged on the upper side of the pressure-bearing clogging device, a pressure-bearing interface groove is formed in the upper end of the pressure-bearing clogging device, and the inside of the pressure-bearing clogging device is improved, so that a valve core filter and a fulcrum fixing piece can be separated under the impact of the formation fluid to realize the setting action, reverse blocking formation fluid is prevented from entering the clogging device, damage to the valve core filter of the clogging device is reduced in the flowing process of the formation fluid in a fluid passage, and the service life of the clogging device is prolonged; and meanwhile, through the pressure on the valve core filter during reverse flowing of the formation fluid, particulate matter are reduced from being blocked between the valve core filter and a mandrel, so that the clogging device continuously maintains the separation effect.

Description

technical field [0001] The invention relates to the technical field of oil and gas production, and more specifically relates to a separate pressure-bearing plug used for downhole pipe strings and a usage method thereof. Background technique [0002] For special equipment for oil and gas drilling and production, among the failures of mining equipment, there are mainly four types of failures: damage, aging and looseness, imbalance, and performance failure caused by blockage and leakage, which are manifested as cracking and corrosion of parts. Problems and problems such as strain deformation, cracking and indentation, while aging problems are mainly reflected in the deterioration and aging of materials, wear and peeling, etc., followed by loose faults, which are mainly reflected in the falling and loosening of parts Wait. [0003] In the drilling process before oil and gas drilling, directional drilling technology is generally used to realize "one base with multiple holes, one...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned technical scheme can not only complete the work of setting the packer, but also has the effect of reverse pressure due to the sealing valve that can seal off the fluid channel, preventing the formation fluid from entering the plug and ensuring the safety of the construction process. The sealing function mainly depends on the spool inside the sealing valve. The spool moves under the impetus of the internal transmission material. When moving from the lower end of the plug to the end close to the mandrel, the spool and the lower end of the mandrel are prone to collision. , with the increase of use time, the joint between the upper edge of the valve core and the mandrel is easy to be deformed under pressure and collision, so that the upper end of the valve core cannot completely seal the mandrel, which in turn causes the sealing effect of the plug to fail At the same time, because the head of the valve core is hemispherical, when the core shaft is sealed, when some particles are blocked at the junction of the valve core and the core shaft, the valve core and the core shaft are completely separated, which is also easy to cause the function of the plug. Ineffective, unable to prevent formation fluid from entering the inside of the plug

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