# US 2018/0022980 A1 · Use of csh-seed modified fibers in oil field applications

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- Number: US 2018/0022980 A1
- Document ID: US20180022980A1
- Status: Published application
- Kind: A1
- Application number: 15/551,086
- Filed: 2016-02-24
- Published: 2018-01-25
- Earliest claimed: 2015-02-27
- Assignees: BASF SE
- Applicants: BASF SE
- Inventors: Peter LEIDINGER; Radoslaw KIERAT; Bernhard FEICHTENSCHLAGER; Kristina BRANDT
- Web page: https://patentgrep.com/patent/US20180022980A1

## CPC

- C09K 8/467: containing additives for specific purposes
- C04B 16/0641: {Polyvinylalcohols; Polyvinylacetates}
- C04B 20/1077: {Cements, e.g. waterglass}
- C04B 22/0086: {Seeding materials}
- C04B 28/02: containing hydraulic cements other than calcium sulfates
- C04B 28/04: Portland cements
- C09K 8/03: Specific additives for general use in well-drilling compositions
- E21B 33/14: for cementing casings into boreholes
- C09K 2208/08: Fiber-containing well treatment fluids
- Y02W 30/91: Use of waste materials as fillers for mortars or concrete
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

The present invention relates to the use of modified fibers in oilfield applications, particularly in borehole cementing. Said fibers have crystallization seeds attached to their surfaces thereby improving the mechanical strength and ductility of borehole cements.

## Claims

### Claim 1

A method of utilizing fibers in the development, exploitation and completion of underground mineral oil and natural gas deposits and in deep wells, comprising providing therefor reinforcing fibers, wherein calcium silicate hydrate crystallization seeds are attached to said fibers via linker moieties.

### Claim 2 (depends on 1)

The method of claim 1, wherein the fibers are used in borehole cementing, comprising the steps of providing a cement slurry incorporating the fibers, pumping the slurry into the borehole and allowing the slurry to harden.

### Claim 3 (depends on 1)

The method of claim 1, wherein the fibers are selected from polyvinyl alcohol fibers, polyolefin fibers, polysaccharide fibers and mixtures thereof.

### Claim 4 (depends on 1)

The method of claim 1, wherein the fibers are selected from polyvinyl alcohol fibers, polyethylene fibers, polypropylene fibers, cellulose fibers and mixtures thereof.

### Claim 5 (depends on 1)

The method of claim 1, wherein the crystallization seeds are attached to the individual fiber bodies via covalently bound linker moieties in the presence of at least one comb polymer.

### Claim 6 (depends on 5)

The method of claim 5, wherein the comb polymer has a main chain, wherein the comb polymer has side chains comprising polyether functions and acid functions, and wherein the side chains are present on the main chain.

### Claim 7 (depends on 1)

The method of claim 1, wherein the linker moieties comprise one or more functional groups containing an amine, amide, phosphate or phosphonate functionality.

### Claim 8 (depends on 1)

The method of claim 1, wherein the size of the crystallization seeds is between 1 nm and 10 μm.

### Claim 9 (depends on 7)

The method of claim 7, wherein the linker moieties comprise one or more functional groups created from a reagent containing amine, ammonium, amide, nitrate, sulfate, sulfonate, sulfonamide, carboxylate, silanol, phosphate, phosphinate or phosphonate groups.

### Claim 10 (depends on 9)

The method of claim 9, wherein the reagent is an amphiphilic molecule.

### Claim 11 (depends on 8)

The method of claim 8, wherein the size of the crystallization seeds is between 5 nm and 1.5 μm.

### Claim 12 (depends on 8)

The method of claim 8, wherein the size of the crystallization seeds is between 10 nm and 300 nm.

### Claim 13 (depends on 8)

The method of claim 8, wherein the size of the crystallization seeds is between 10 nm and 100 nm.