Novel stereo sand control screen

Abstract

The invention relates to a novel stereo sand control screen which comprises a central base tube, filters, a supporting tray and an overflowing protection sleeve, wherein a plurality of overflowing holes are formed in the wall of the central base tube and filled with the filters, the supporting tray is composed of a first tray body and a second tray body, and the first tray body and the second tray body are fixedly arranged at the two ends of the central base tube respectively; the overflowing protection sleeve is arranged outside the central base tube in a coaxial and sleeved mode, and the two ends of the overflowing protection sleeve are fixed on the central base tube through the first tray body and the second tray body respectively; a plurality of arched structures are arranged on the overflowing protection sleeve, and two screening grooves are formed by each arched structure and the overflowing protection sleeve. The novel stereo sand control screen is good in erosion resistance and filtering effect due to the fact that the overflowing protection sleeve is arranged on the outer layer and the filters are arranged on the inner layer, and especially has good sand prevention and protection functions for gravel packing, removal of burrs left from windowing of a sidetracking well, and removal of burrs left from float collar and float shoe drilling of an operating well.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well sand control, in particular relates to a sand control device, in particular to a novel three-dimensional sand control screen. Background technique [0002] In the process of oil and gas production, there are different degrees of sand production in oil and gas wells. Sand control and sand control are the key to ensure the normal production of oil and gas wells and improve the production life. Sand control screens are important completion tools to control sand production in oil and gas wells. For sand control A number of patented technologies have emerged in the research of screen tubes at home and abroad, which can be summarized as the following structures: [0003] (1) Slotted liner: simple structure, low cost, easy construction, but small flow area, unable to prevent fine sand; poor self-cleaning ability, easy to block and easy to be eroded; Low compressive strength; suitable for use in...

AI Technical Summary

Problems solved by technology

[0003] (1) Slotted liner: simple structure, low cost, easy construction, but small flow area, unable to prevent fine sand; poor self-cleaning ability, easy to block and easy to be eroded; Low compressive strength; suitable for use in medium-coarse sandy oil reservoirs where business trips are not serious;

[0004] (2) Wire-wrapped screen: on-site construction is complex and difficult to operate; low strength and easy to fall off; seepage area is small; bending deformation of the screen affects the size of the pre-set screen gap and sand control accuracy;

[0005] (3) Sand control screen with composite graded sand control filter structure: the sand control filter of the composite screen is welded into a cylindrical shape, which will cause damage to the filter; the inner protective cover, sand control filter and outer protective cover are set in layers On the base pipe, there are gaps between layers, which can easily cause the filter to deform under pressure, affect the filtration accuracy and even lead to sand control failure; the filter layer is easy to accumulate sand and block;

[0006] (4) Expandable screen: The on-site construction process of the expandable screen is complex, the cost is high, the operation period is long, and there are construction risks; the strength of the expandable screen decreases after expansion, and the tensile and torsion resistance at the connecting buckle is weak; not applicable Applied in large curvature wells and long well sections; if it is too tightly attached to the open hole wall, it will bring resistance to seepage and cause pressure loss

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