# US 11,898,421 B2 · Sand control device for marine hydrate production

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- Number: US 11,898,421 B2
- Document ID: US11898421B2
- Status: Granted
- Kind: B2
- Application number: 18/136,357
- Filed: 2023-04-19
- Published: 2023-11-02
- Granted: 2024-02-13
- Earliest claimed: 2022-04-27
- Assignees: Southwest Petroleum University
- Applicants: Southwest Petroleum University
- Inventors: Jinze Song; Shuxian Jiang; Hongjun Zhu; Shuai Liu; Yue Gao
- Web page: https://patentgrep.com/patent/US11898421B2

## CPC

- E21B 41/0099: {specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates}
- E21B 43/08: Screens or liners {(expandable screens or liners E21B43/108)}
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

The present invention discloses a sand control device for marine hydrate production, which comprises a top motor, a bottom motor, and an inner-layer sand control cylinder, an outer-layer sand control cylinder and an outer-layer sand control screen coaxially arranged from inside to outside, wherein the top motor and bottom motor are configured to control the inner-layer sand control cylinder and the outer-layer sand control cylinder to rotate reversely, and wherein a plurality of sand retaining balls are provided between the inner-layer sand control cylinder and the outer-layer sand control cylinder and between the outer-layer sand control cylinder and the outer-layer sand control screen. According to the present invention, the arrangement of the inner-layer sand control cylinder and the outer-layer sand control cylinder rotating reversely can effectively prevent formation sand from accumulating on the surface of a sand control screen pipe and blocking the sand control screen pipe.

## Claims

### Claim 1

A sand control device for marine hydrate production, comprising an inner-layer sand control cylinder I and an outer-layer sand control screen arranged coaxially from inside to outside, and a motor I configured to drive the inner-layer sand control cylinder I to rotate, wherein a plurality of sand retaining balls are provided between the inner-layer sand control cylinder I and the outer-layer sand control screen; and
further comprising an inner-layer sand control cylinder II and a motor II, wherein the inner-layer sand control cylinder II and the inner-layer sand control cylinder I are arranged coaxially, the inner-layer sand control cylinder II has an outer diameter smaller than an inner diameter of the inner-layer sand control cylinder I, and a plurality of sand retaining balls are also provided between the inner-layer sand control cylinder II and the inner-layer sand control cylinder I, and wherein the motor II is configured to drive the inner-layer sand control cylinder II to rotate, and the rotating direction of the inner-layer sand control cylinder II is opposite to that of the inner-layer sand control cylinder I.

### Claim 2 (depends on 1)

The sand control device for marine hydrate production according to claim 1, wherein the inner-layer sand control cylinder I has the sand retaining mesh size less than or equal to that of the outer-layer sand control screen.

### Claim 3 (depends on 1)

The sand control device for marine hydrate production according to claim 1, wherein the sand retaining ball has a diameter greater than the sand retaining mesh size of the outer-layer sand control screen.

### Claim 4 (depends on 1)

The sand control device for marine hydrate production according to claim 1, wherein an inner surface of the outer-layer sand control screen is provided with a plurality of uniformly distributed radial steel rings I.

### Claim 5 (depends on 4)

The sand control device for marine hydrate production according to claim 4, wherein an outer surface of the inner-layer sand control cylinder I is provided with a plurality of uniformly distributed radial steel rings II.

### Claim 6 (depends on 5)

The sand control device for marine hydrate production according to claim 5, wherein the radial steel ring I and the radial steel ring II are distributed in a vertically staggered mode.

### Claim 7 (depends on 1)

The sand control device for marine hydrate production according to claim 1, wherein the inner-layer sand control cylinder II has the sand retaining mesh size less than or equal to that of the inner-layer sand control cylinder I.

### Claim 8 (depends on 1)

The sand control device for marine hydrate production according to claim 1, wherein an outer surface of the inner-layer sand control cylinder II is provided with a plurality of uniformly distributed radial steel rings III.

### Claim 9 (depends on 8)

The sand control device for marine hydrate production according to claim 8, wherein when an outer surface of the inner-layer sand control cylinder I is provided with a plurality of uniformly distributed radial steel rings II, the radial steel ring III and the radial steel ring II are in the same horizontal plane.