An oil and gas well downhole hydraulic hammer

Abstract

The invention provides a down-hole hydraulic hammer for an oil and gas well. When the hydraulic hammer impacts downwards, the flow velocity at a nozzle opening formed in the lower portion is increased, and the pressure is reduced, so that a pressure difference is formed in the upper portion and the lower portion of a shuttle, and the shuttle drives a hammerhead to impact on a hammering block below the shuttle; meanwhile, a switch sliding sleeve is driven to move downwards to close third holes, that is to say, a flow passage is closed, so that a fluid is static in a tool, pressure is recovered, and an internal and external pressure difference is formed between the recovered pressure and the flowing pressure difference outside the shuttle and acts on the shuttle to enable the shuttle to move upwards and return to the state before impact is conducted. According to the down-hole hydraulic hammer for the oil and gas well, the impact effect is better, the service life is longer, the tripping time of the drilling tool is reduced, and the drilling time is saved.

Description

technical field [0001] The invention relates to an oil and gas well downhole hydraulic hammer. Background technique [0002] During downhole operations in oil and gas wells, especially horizontal well drilling, when drilling and grinding bridge plugs, the WOB given by the ground often cannot be actually effectively increased on the drill bit (shoe grinding), so that the drill bit has no pressure to drill normally. There are two types of existing similar tools: one is to push the drill bit through the piston to provide the drilling pressure required by the drill bit; the other is to push the piston by the pressure difference and hit the drill bit to form a percussion force, and the percussion after the percussion Reset is reset by spring, and the life of spring is limited, which determines that the life of the old-fashioned is relatively short. Contents of the invention [0003] The invention proposes a downhole hydraulic hammer for oil and gas wells. The design is based o...

AI Technical Summary

Problems solved by technology

[0002] During downhole operations in oil and gas wells, especially horizontal well drilling, when drilling and grinding bridge plugs, the drilling pressure given by the ground often cannot be actually effectively increased on the drill bit (grinding shoe), so that the drill bit has no pressure to drill normally.

There are two types of existing similar tools: one is to push the drill bit through the piston to provide the drilling pressure required by the drill bit; the other is to push the piston by the pressure difference and hit the drill bit to form a percussion force, and the percussion after the percussion The reset is by the spring, and the life of the spring is limited, which determines the short life of the old-fashioned

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