# US 2017/0254157 A1 · Isolation Sleeve for Downhole Equipment

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2017/0254157 A1
- Document ID: US20170254157A1
- Status: Published application
- Kind: A1
- Application number: 15/062,536
- Filed: 2016-03-07
- Published: 2017-09-07
- Earliest claimed: 2016-03-07
- Assignees: Tejas Research & Engineering, LLC
- Applicants: Tejas Research & Engineering, LLC
- Inventors: Jason C. Mailand
- Web page: https://patentgrep.com/patent/US20170254157A1

## CPC

- E21B 34/06: in wells
- E21B 17/1007: {for the internal surface of a pipe, e.g. wear bushings for underwater well-heads}
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A protective sleeve is deployable within an oil/gas well to protect a device installed in the well such as a safety valve, for example. The sleeve includes a pressure equalizing dart and an overpressure protection piston. The sleeve also serves to isolate an installed device from harmful substances such as acids and other corrosive fluids.

## Claims

### Claim 1

A protective sleeve adapted to be secured within a well for protecting existing devices positioned within the well from pressure, wear, and exposure to harsh chemicals comprising;
a) a housing including a collet housing and a downstream housing,
b) a locking collet slidably received in said collet housing,
c) the housing including a pressure balancing chamber, a floating piston within the pressure balancing chamber and a frangible member for preventing movement of the floating piston until a threshold differential pressure is reached.

### Claim 2 (depends on 1)

The protective sleeve of claim 1 wherein the frangible member is a frangible pin having an end positioned in a groove on an outer surface of the floating piston.

### Claim 3 (depends on 2)

The protective sleeve of claim 2 further including a port extending from the pressure balancing chamber to the exterior of the housing.

### Claim 4 (depends on 1)

The protective sleeve of claim 1 wherein the collet housing has first, second, and third grooves adapted to receive ridges on fingers of the locking collet.

### Claim 5

A protective sleeve adapted to be secured within a well for protecting a device positioned within the well comprising:
a) a housing including a collet housing and a downstream housing,
b) a locking collet slidably received in said collet housing and
c) a pressure equalizing dart located in a wall of the housing and having a flow passage closed at an end by a frangible member, said frangible member being severed as the protection sleeve is withdrawn from the well.

### Claim 6 (depends on 5)

The protective sleeve of claim 5 wherein the locking collet has a slot adapted to receive the frangible member of the pressure equalizing dart.

### Claim 7 (depends on 5)

The protective sleeve of claim 5 wherein the housing further includes a pressure balancing chamber and a floating piston within the chamber.