Horizontal oil well sand-pumping device as well as sand-pumping method thereof

Abstract

The invention relates to the petroleum machinery technical field, in particular to a bailing device for a horizontal well and a bailing method using the same. The invention provides the bailing device for the horizontal well and the bailing method using the same to solve the problem of sealing property for a check valve in the prior bailing process and the problem of frictions between a pump body of a bailing pump and a bushing and between the pump body of the bailing pump and a coupling, wherein, a drainage orifice is arranged above a vertical segment of a bailing pump, a piston barrel is arranged under the drainage orifice, a piston rod inside the piston barrel is provided with an upper valve, and the lower end of the piston rod is provided with a hard piston and a soft piston; a sand blocking short circuit is arranged under the piston barrel; the front end of the horizontal segment of the bailing pump is provided with a tool for cutting and pushing sands, while the other end of the tool for cutting and pushing sands is provided with a bottom valve and a sand shovel, a valve core and a valve seat of the bottom valve are jointed through a spring; and a centralizer is arranged on the pump body of the horizontal segment of the bailing pump. The bailing device for the oil well has the advantages of excellent sealing property; small friction between the bailing pump and the bushing and between the bailing pump and the coupling; long service life; effective prevention of massive sand particles from entering inside the piston barrel; strong sand pumping property of the piston; and high work efficiency.

Description

technical field

[0001] The invention relates to the technical field of petroleum machinery, in particular to a sand dredging device for a horizontal well and a sand dredging method thereof. Background technique

[0002] During the development of oil fields, due to the low cementation strength of loose sandstone formations or the impact of fracturing operations, sand particles will flow into the wellbore along with the formation fluid, causing wellbore blockage, increased wear of downhole pipe strings, tools and ground equipment, and lead to oil well production reduction or discontinued. Under normal circumstances, the water circulation carrying method is used to wash away the wellbore sand deposits and bring them to the ground with the help of high-speed flowing liquid. Due to the compatibility, density and viscosity requirements of the sand washing fluid and the formation, this sand washing method can easily cause formation pollution and ground environmental pollution; for...

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