Tool for gravel fillup and bypass gravel fillup

Abstract

A gravel-filling or a bypass gravel-filling tool comprises a filling assembly (1) and an exterior assembly (2). The tool is characterized in that the exterior assembly (2) comprises a switch short section (4) and a lower joint (17), both of which are arranged below an outer short section (3) and connected in sequence; a positioning lock spring (5) mounted inside the switch short section (4) and a sealing short section (6) below the positioning lock spring (5); a connecting lock spring (7), a lock ring (8), a conversion inner body (13), a uniflux valve (14) and a limiting short section (16) are connected in sequence under the sealing short section (6); a bypass filling sliding bush (9) and a filling bush (11) are mounted in the annular space between the switch short section (4) and the conversion inner body (13); a positioning ring (15) is arranged between the switch short section (4) and the limiting short section (16), and the filling assembly (1) is arranged inside the exterior assembly (2). The tool adopts the converting and filling structure and has the following characteristics: the tool can prevent blocking, sticking and filling interruption, and can be widely used in the technology of filling an oil well with gravel after oil exploitation.

Description

1. Technical field [0001] The invention relates to downhole operation tools for petroleum exploitation, in particular to a gravel packing / bypass gravel packing tool. 2. Background technology [0002] The traditional gravel packing sand control tools are mainly composed of gravel packing / bypass packing conversion mechanism, which plays an important role in the gravel packing sand control technology of oil exploitation, but there are also the following shortcomings or deficiencies at the same time: The influence is large, the positioning is reliable when the pressure is low, and the slips and other parts are easy to deform when the pressure is high, causing mechanical accidents and resulting in operation failure; ②When filling operations, it is necessary to throw balls and other operations, which is unreliable and risky; ③Close the filling hole Depending on the spring mechanism, it is prone to mechanical deformation, unreliable closing, prone to blockage, jamming, and buried a...

AI Technical Summary

Problems solved by technology

[0002] The traditional gravel packing sand control tools are mainly composed of gravel packing / bypass packing conversion mechanism, which plays an important role in the gravel packing sand control technology of oil exploitation, but there are also the following shortcomings or deficiencies at the same time: The influence is large, the positioning is reliable when the pressure is low, and the slips and other parts are easy to deform when the pressure is high, causing mechanical accidents and resulting in operation failure; ②When filling operations, it is necessary to throw balls and other operations, which is unreliable and risky; ③Close the filling hole Depending on the spring mechanism, it is prone to mechanical deformation, unreliable closing, prone to blockage, jamming, and buried accidents, which reduces the effect or success rate of construction operations; ④ During construction operations, if the lower part is blocked, the upper part cannot continue to be filled, resulting in filling construction. Failed, suffered huge economic losses

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