# US 9,518,207 B2 · Methods to prevent formation damage from friction reducers

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- Number: US 9,518,207 B2
- Document ID: US9518207B2
- Status: Granted
- Kind: B2
- Application number: 13/538,803
- Filed: 2012-06-29
- Published: 2014-01-02
- Granted: 2016-12-13
- Earliest claimed: 2012-06-29
- Assignees: Halliburton Energy Services, Inc.
- Applicants: James William Ogle; Xiangnan Ye; Pinmanee Boontheung; Rajesh Kumar Saini; Narongsak Tonmukayakul
- Inventors: James William Ogle; Xiangnan Ye; Pinmanee Boontheung; Rajesh Kumar Saini; Narongsak Tonmukayakul
- Web page: https://patentgrep.com/patent/US9518207B2

## CPC

- C09K 8/035: Organic additives
- C09K 2208/28: Friction or drag reducing additives
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A method of servicing a wellbore comprising placing a wellbore servicing fluid comprising a modified friction reducer into the wellbore. A modified friction reducer comprising a degradable polymer having functional degradable moieties, a polymer having a molecular weight of from about 5M to about 30M, a polymer having a PDI of from about 1.0 to about 2.5, a weakly crosslinked polymer, or combinations thereof.

## Claims

### Claim 1

A method of servicing a wellbore comprising:
preparing a friction reducer using a diradical diinitiator having Structure I or Structure II:
and
placing a wellbore servicing fluid comprising the friction reducer into the wellbore.

### Claim 2 (depends on 1)

The method of claim 1 wherein the friction reducer comprises at least one additive selected from the group consisting of: a polysaccharide, a polyacrylamide, and any combination thereof.

### Claim 3 (depends on 1)

The method of claim 1 wherein the friction reducer comprises functional degradable moieties.

### Claim 4 (depends on 3)

The method of claim 3 wherein the functional degradable moieties comprise esters, amides, ethylene oxides, carbonates, acetals, or combinations thereof.

### Claim 5 (depends on 3)

The method of claim 3 wherein the functional degradable moieties are present in an amount of about 3 per polymer chain.

### Claim 6 (depends on 3)

The method of claim 3 wherein the friction reducer is present in the wellbore servicing fluid in an amount of from about 1 ppm to about 5000 ppm.

### Claim 7 (depends on 3)

The method of claim 3 further comprising degrading the functional degradable moieties.

### Claim 8 (depends on 7)

The method of claim 7 wherein degrading the functional degradable moieties comprises exposure to wellbore servicing conditions, contact with a degrading material, or combinations thereof.