Axial oscillating tool for drill string

Abstract

The invention relates to an axial oscillating tool for a drill string, which is used for improving extension and drilling capacities of a horizontal section during drilling of a directional well, a horizontal well and a large-displacement well. The technical scheme is that: the axial oscillating tool for the drill string consists of a stator and rotor unit and a valve unit, wherein an inner wall of a stator is adhered to stator rubber; the stator rubber and a rotor form a sealed chamber; the lower end of the rotor is provided with a flow passage inclined hole; a valve body is fixed to the lower end of the rotor through a valve body nut; a valve seat is connected to a valve seat support body through a valve seat nut; the valve seat support body is arranged in a valve shell through threads; the valve seat is matched with the valve body to form opening and closing of the valve along with movement of the rotor; and the valve shell is in threaded connection with a stator shell. The axial oscillating tool for the drill string has the advantages of high axial oscillation capacity, simple structure, safety and the like; and the extension and drilling capacities of the horizontal section of the directional well, the horizontal well and the large-displacement well can be improved.

Description

technical field [0001] The invention relates to a drilling string axial oscillation tool used for improving the extended drilling ability of the horizontal section in the drilling of directional wells, horizontal wells and extended displacement wells. Background technique [0002] With the deepening of the exploration and development process, the proportion of directional wells, horizontal wells and extended reach wells is increasing. Long horizontal section drilling technology has been widely used at home and abroad, mainly due to its good input-output ratio. At present, the drilling cost of horizontal wells in foreign countries has been reduced to 1.2 to 2 times that of vertical wells, while the output is 4 to 8 times that of vertical wells. As a potential new technology, horizontal well technology mainly has the following advantages: restoring the productivity of old wells, developing complex types of oil and gas reservoirs, facilitating exploration and development evalu...

AI Technical Summary

Problems solved by technology

However, due to the small size of coiled tubing, large flexibility, and poor ability to transmit WOB, the drilling footage in the horizontal section is limited, which limits the application of this technology.

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