Horizontal well gravel packing tool

Abstract

The invention discloses a horizontal well gravel packing tool which comprises a connecting collar, an outer cylinder, a liner, an upper core tube, a core tube collar, a lower core tube, an outer cylinder centralizer, a spring sleeve, a sliding sleeve, a spring, a liner guider, a wire-wrapped screen, a plug and a guide head. The tool is capable of conveniently and mechanically positioning, heavy work of largely and accurately calculating tubular columns is decreased for constructors, a central inserting tube is only tripped in, fixed and lifted out, simple to operate, safe and reliable during construction, a packing port of an outer tool is closed twice by the aid of the tool, gravel regurgitation is avoided after construction, and a packing port of the central inserting tube falls by a certain depth and enters the bottom of an inner cavity of the outer packing tool after the central inserting tube is positioned. By the aid of the structure, gravels cannot enter the space between the central inserting tube and the outer packing tool even if the tubular columns move when the central inserting tube is packed, so that the major accident of sand jamming of the tubular columns is avoided.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a gravel packing tool used in horizontal well gravel packing construction operations. Background technique [0002] Horizontal wells can effectively increase single well production, increase reserve production rate, and reduce overall cost, so they have been widely used in the development of various oilfields. At present, most of the target formations of domestic horizontal wells are buried shallowly, and the formations are loosely cemented and prone to sand production, which restricts the development effect and production speed of horizontal wells. As time goes by, it will cause sand to bury the oil layer, sand to block the oil pipe, and the production will drop; in severe cases, the formation will collapse and the oil well will be scrapped. [0003] Gravel packing is a commonly used method at present. In the process of gravel packing in horizontal wells, it is necessary to fi...

AI Technical Summary

Problems solved by technology

However, there are still the following problems in the application of this tool for gravel packing in horizontal wells: 1) During construction, each pipe string needs to be measured on site, and a large number of calculations are required, which is prone to errors; 2) In gravel packing construction, due to pressure changes, This causes the pipe string to move, causing gravel to enter between the intubation pipe and the filling tool, forming sand stuck in the pipe string and causing major accidents; 3) After the construction is completed, the filling port of the filling tool is not closed tightly, resulting in the regurgitation of gravel

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