Gravel Packing Tools while flushing

Abstract

The invention discloses a wash-down gravel packing tool and relates to the technical field of oil well sand control. The wash-down gravel packing tool comprises a hanger, a sand filtering pipe and a bottom well washer which are sequentially connected from top to bottom, wherein the hanger and the sand filtering pipe are connected together through a quick connector; the hanger, the sand filtering pipe and the inner cavity of the bottom well washer are combined to form a circulation channel for packing; a service pipe column is arranged in the circulation channel and comprises a central pipe positioned in the cavity body of the hanger; an upper joint is in threaded connection with the upper end of the central pipe; a threaded pipe connected with the hanger is arranged on the outer wall of the central pipe; washing pipes are connected with the lower end of the central pipe through washing pipe joints; and sealing plugs are connected with the lower ends of the washing pipes, pass through the cavity body of the sand filtering pipe, and extend into the bottom well washer. The wash-down gravel packing tool has the beneficial effects the structure is simple, the wash-down function is achieved, and the washing speed is high; the formation sand blockage problem can be effectively solved during the downward feeding of a pipe column; meanwhile, the emptying of a shaft pocket can be avoidedduring the packing construction; and the construction effect is good.

Description

technical field [0001] The invention relates to the technical field of sand control in oil wells, in particular to a gravel filling tool while flushing and lowering. Background technique [0002] For the very loosely cemented formation, commonly known as the quicksand layer, when the liquid flow fluctuates, the formation will spit out a large amount of sand. During the sand control operation, the perforating gun is often fired, and the formation sand immediately buries the blast hole, resulting in subsequent The sand control string cannot be lowered into place, so brine sand washing and well killing can only be used multiple times. Sometimes a well needs to be repeatedly sand washed several times before the string can be lowered into place. [0003] Using ordinary sand washing and filling technology, the sand control pipe string is put in place, the flushing pipe string is pulled out, and when the filling pipe string is lowered, the formation sand has partially buried the sc...

AI Technical Summary

Problems solved by technology

[0002] For the very loosely cemented formation, commonly known as the quicksand layer, when the liquid flow fluctuates, the formation will spit out a large amount of sand. During the sand control operation, the perforating gun is often fired, and the formation sand immediately buries the blast hole, resulting in subsequent The sand control string cannot be lowered into place, so brine sand washing and well killing can only be used multiple times. Sometimes a well needs repeated sand washing several times before the pipe string can be lowered into place

[0003] Using ordinary sand washing and filling technology, the sand control pipe string is put in place, the flushing pipe string is pulled out, and when the filling pipe string is lowered, the formation sand has partially buried the screen pipe string. On the one hand, the formation sand affects the filling construction, and on the other hand On the one hand, when it is mixed with filling sand to form a mixed sand belt, it will directly lead to a decrease in the permeability of the filling layer and affect the sand control effect.

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