Oil well horizontal sand-pumping device as well as sand-pumping method thereof

Abstract

The invention relates to the petroleum machinery technical field, in particular to a horizontal bailing device for an oil well and a bailing method using the same. The invention provides the horizontal bailing device for the oil well and the bailing method using the same to solve a problem of sealing property for a check valve in the prior bailing process and a 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 piston rod, a drainage hole, an upper valve, a piston barrel, a hard piston, a soft piston, a desilting pipe and a tool for cutting and pushing sands are arranged in sequence from a turning position of the bailing pump to the other end of a horizontal segment inside the pump body; a sand blocking short circuit is arranged between the piston barrel and the desilting pipe, and a centralizer is arranged on the pump body of the horizontal segment; the tail end of the horizontal segment of the bailing pump is provided with a bottom valve and a sand shovel, wherein, both the upper valve and the bottom valve are check valves, and a valve core and a valve seat are jointed through a spring. The horizontal 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 horizontal sand fishing device for an oil well and a sand fishing 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; ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the sealing problem of the single flow valve in the existing sand fishing process and the friction problem between the pump body of the sand fishing pump, the casing and the coupling, the invention provides a horizontal sand fishing device and a sand fishing method for oil wells. Improve the efficiency of dredging sand, save costs, and remove sand thoroughly, without polluting oil layers

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