# US 9,435,184 B2 · Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification

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- Number: US 9,435,184 B2
- Document ID: US9435184B2
- Status: Granted
- Kind: B2
- Application number: 13/536,082
- Filed: 2012-06-28
- Published: 2014-01-02
- Granted: 2016-09-06
- Earliest claimed: 2012-06-28
- Assignees: Carbon Energy Inc.
- Applicants: Burl Edward Davis; Clifford William Mallett; Marion Russell Mark
- Inventors: Burl Edward Davis; Clifford William Mallett; Marion Russell Mark
- Web page: https://patentgrep.com/patent/US9435184B2

## CPC

- E21B 29/02: by explosives or by thermal or chemical means {(freeing stuck objects by explosives E21B31/002)}
- E21B 17/042: Threaded
- E21B 17/06: Releasing-joints, e.g. safety joints
- E21B 43/006: {Production of coal-bed methane (E21B43/243 takes precedence)}
- E21B 43/08: Screens or liners {(expandable screens or liners E21B43/108)}
- E21B 43/168: {Injecting a gaseous medium}
- E21B 43/24: using heat, e.g. steam injection
- E21B 43/243: Combustion in situ
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A sacrificial liner linkage that can be used to automatically shorten a liner for an underground coal gasification process is provided. The sacrificial liner linkage may be one or more sacrificial liner linkage portions that are spaced between one or more liner portions in which the sacrificial liner linkage portions disintegrate before the one or more liner portions to automatically shorten the liner.

## Claims

### Claim 1

An injection well liner for an underground coal gasification process, the injection well liner comprising:
a proximal end and a distal end of the injection well liner through which an oxidizing gas is injected for an underground coal gasification process, the oxidizing gas being injected at the proximal end and output at a distal end of the injection well liner, the injection well liner having one or more liner portions and one or more sacrificial liner portions in between the one or more liner portions; and
wherein each of the one or more sacrificial liner portions individually and entirely disintegrate due to a temperature during the underground coal gasification process so that each sacrificial liner and the liner portion connected to a distal end of each sacrificial liner fall off and the injection well liner is automatically shortened during the underground coal gasification process.

### Claim 2 (depends on 1)

The injection well liner of claim 1, wherein each of the one or more sacrificial liner portions disintegrate at a lower temperature than the one or more liner portions.

### Claim 3 (depends on 2)

The injection well liner of claim 2, wherein each of the one or more sacrificial liner portions disintegrate at a temperature of 350 degrees Celsius.

### Claim 4 (depends on 1)

The injection well liner of claim 1, wherein each of the one or more sacrificial liner portions is made of one of a fiberglass and a resin.

### Claim 5 (depends on 4)

The injection well liner of claim 4, wherein the resin is a high temperature epoxy tooling resin with comparable mechanical properties to a steel liner portion.

### Claim 6 (depends on 1)

The injection well liner of claim 1, wherein each of the one or more sacrificial liner portions has a predetermined distance between another sacrificial liner portion.

### Claim 7 (depends on 1)

The injection well liner of claim 1, wherein each of the one or more sacrificial liner portions melts.

### Claim 8 (depends on 1)

The injection well liner of claim 1, wherein each liner portion is made of steel.

### Claim 9 (depends on 1)

The injection well liner of claim 1, wherein each liner portion and each sacrificial liner portion is connected together by a threaded joint.