Expandable sand screen device capable of controlling sand removal granularity

Abstract

The invention relates to an expandable sand screen device capable of controlling the sand removal granularity. An expandable mounting mechanism comprises a hanger, a casing pipe, a drill rod, an upper rubber ring, a perforated hole, an expandable head guide device, an intelligent expandable head, a lower fixed rubber ring, an expandable sealing rubber ring, an expandable sealing gasket, a bottom sealing gasket, a bottom sealing rubber ring, a steel ball and a base. An expandable sand screen filtering mechanism comprises an expandable pipe, end threads, a sand screen, a middle thread, an outer protection layer, a transverse seam layer (the section of the transverse seam layer is a local structure enlarged view of the local structure layer), an inner connecting layer (the section of the inner connecting layer is a local structure enlarged view of the inner connecting layer), inner connecting layer round holes, outer protection layer round holes, and sand screen transverse seams. According to the expandable sand screen device capable of controlling the sand removal granularity, the drainage area is enlarged through expanding, and the output of oil extraction is increased by half; the sand removal granularity range can be determined directly through calculation by a formula according to the physical dimension of the screen and the expansion rate, sand removal is stable, and sand removal efficiency is high; the expandable sand screen device is resistant to abrasion and corrosion by sulfuretted hydrogen, good in structural stiffness, not prone to distortion and long in service life; and installation and construction are easy, the expansion resistance is small, the process is stable, and sealing is reliable.

Description

technical field [0001] The invention belongs to the field of petroleum drilling and production engineering, and in particular relates to an expansion screen for controlling the particle size of sand removal. Background technique [0002] Expandable Sand Screen technology (Expandable Sand Screen) is a new sand control technology. The sand control screen is subject to expansion and diameter expansion during downhole construction. This technology was first applied in Thayfut 5 Well in Oman, and the effect of sand removal and production stimulation has been affirmed. This technology Although it also spreads to a certain range, the problem encountered is that the filtration gap cannot be controlled during the expansion process. Generally, the expansion filtration gap needs to be widened several times, which seriously affects the sand removal effect. [0003] Chinese patent CN201410223276.6 discloses an expandable screen tube, which includes an inner tube, a middle tube and an out...

AI Technical Summary

Problems solved by technology

Although the problem of sand control is mentioned, there is no measure to control the gap in the expansion process, and the purpose of controlling the sand removal is still not achieved. The reason is that the structural design of the expansion screen is not reasonable.

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