Oil companies almost always refuse to divulge the chemical soup they use for fracking, but in California they're forced to. From deep inside a Conservation Department report comes this list.

>>> "Well Stimulation Treatment: First Annual Report," California Department of Conservation: Division of Oil, Gas, and Geothermal Resources, Dec 31, 2015, pages 60-68. [PDF link]

2015

Table 67: Top 20 Chemical Constituents used in WST by Frequency of Use


Constituent Name

CAS Number

Times Used for WST

Crystalline silica: Quartz (SiO2)

14808-60-7

1071

Diatomaceous Earth, Calcined

91053-39-3

850

Guar Gum

9000-30-0

712

2-Methyl-4-Isothiazolin-3-One

2682-20-4

664

Crystalline Silica: Cristobalite

14464-46-1

664

Magnesium Chloride

7786-30-3

664

Magnesium Nitrate

10377-60-3

664

5-Chloro-2-Methyl-4-Isothiazolin-3-One

26172-55-4

663

Ammonium Persulfate

7727-54-0

661

Hemicellulase Enzyme Concentrate

9025-56-3

657

Ethylene Glycol

107-21-1

655

2-Butoxy-1-Propanol

15821-83-7

648

Isotridecanol, ethoxylated

9043-30-5

648

Paraffinic Petroleum Distillate

64742-55-8

648

Petroleum Distillates

64742-47-8

648

1-Butoxy-2-Propanol

5131-66-8

647

Sodium Hydroxide

1310-73-2

645

Sodium Tetraborate Decahydrate

1303-96-4

608

Phosphonic Acid

13598-36-2

528

Nitrilotris (Methylene Phosphonic Acid)

6419-19-8

527

Source: Interim Well Stimulation Database, WST Disclosures Index, operator disclosures


Table 68: Chemical Constituents used in WST by Constituent Name


Constituent Name

CAS Number

Times Used for WST

1, 2, 3 - Propanetriol

56-81-5

7

1,2,3-Trimethylbenzene

526-73-8

12

1,2,4,5-Tetrabromobenzene

636-28-2

1

1,2,4-Trimethylbenzene

95-63-6

6

1,2-benzisothiazolin-3-one

2634-33-5

7

1,2-Diiodobenzene

615-42-9

1

1,3,5-Tribromobenzene

626-39-1

1

Constituent Name

CAS Number

Times Used for WST

1,3,5-Trimethylbenzene

108-67-8

6

1,4-Dibromobenzene

106-37-6

1

1-bromo-3,5-dichlorobenzene

19752-55-7

1

1-Bromo-4-iodobenzene

589-87-7

1

1-Butoxy-2-Propanol

5131-66-8

647

1-Chloro-4-Iodobenzene

637-87-6

1

1-Eicosene

3452-07-1

13

1-Hexadecene

629-73-2

19

1-Iodonaphthalene

90-14-2

1

1-Methoxy-2-Propanol

107-98-2

2

1-Octadecene

112-88-9

19

1-Tetradecene

1120-36-1

20

2,2 Dibromo-3-nitrilopropionamide

10222-01-2

9

2,2`,2"-nitrilotriethanol

102-71-6

29

2,2'-oxydiethanol

111-46-6

28

2,4,5-Tribromotoluene

3278-88-4

1

2,4,6-Tribromotoluene

6320-40-7

1

2,4-Dibromomesitylene

6942-99-0

1

2,5-Dibromothiophene

3141-27-3

1

2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[(4-sulfor-1-naphthalenyl) azo] -, trisodium salt


915-67-3


1

2,7-Naphthalenedisulfonic acid, 5-(acetylamino) -4-hydroxy-3-[(2- methoxyphenyl) azo] -, disodium salt


6625-46-3


1

2-Bromonaphthalene

580-13-2

1

2-Butoxy-1-Propanol

15821-83-7

648

2-butoxyethanol

111-76-2

1

2-ethylhexan-1-ol

104-76-7

30

2-hydroxy-N,N,N-trimethylethanaminium chloride

67-48-1

7

2-hydroxytrimethylene,bis(trimethylammonium) dichloride

55636-09-4

382

2-Iodobiphenyl

2113-51-1

1

2-Methyl-4-Isothiazolin-3-One

2682-20-4

664

2-Monobromo-3-nitrilopropionamide

1113-55-9

10

2-Propenoic acid, polymer with sodium phosphinate

129898-01-7

29

Constituent Name

CAS Number

Times Used for WST

3,5-Dibromotoluene

1611-92-3

1

3-aminopropyl (sileanetriol)

58160-99-9

11

4-Chlorobenzophenone

134-85-0

1

4-Iodo-o-Xylene

31599-61-8

1

4-Iodotoluene

624-31-7

1

5-Chloro-2-Methyl-4-Isothiazolin-3-One

26172-55-4

663

5-Iodo-m-Xylene

22445-41-6

1

9-Bromophenanthrene

573-17-1

1

Acetic acid

64-19-7

56

Acetic acid, potassium salt

127-08-2

29

Acetyl Triethyl Citrate

77-89-4

12

Acid Phosphate Ester

9046-01-9

1

Acrylamide acrylate copolymer

9003-06-9

1

Acrylonitrile

107-31-1

1

Alcohol, C11-14, ethoxylated

78330-21-9

29

Alcohol, C7-9-iso, C8, ethoxylated

78330-19-5

26

Alcohol; C9-11-iso; C10; ethoxylated

78330-20-8

1

Alcohol; C9-C11; Ethoxylated

68439-46-3

1

Alcohols, C12-16, ethoxylated

68551-12-2

6

Alcohols, C14-C15, ethoxylated

68951-67-7

19

Aldehyde

104-55-2

2

Aldol

107-89-1

2

Alkyl (c10-c14) alcohols, ethoxylated

66455-15-0

29

Alkylaryl sulfonate

68584-27-0

6

Alkylbenzene sulfonate compd. with 2-propanamine

68584-25-8

9

Alkylbenzene sulfonate compd. with triethanolamine

68584-24-7

9

Aluminum chloride, hexahydrate

7784-13-6

1

Aluminum Needles

7429-90-5

1

Aluminum Oxide

1344-28-1

5

Aluminum Silicate

1302-76-7

1

Amine Salts

54300-24-2

2

Amines, hydrogenated tallow alkyl, acetates

61790-59-8

16

Constituent Name

CAS Number

Times Used for WST

Ammonium acetate

631-61-8

3

Ammonium bifluoride

1341-49-7

2

Ammonium chloride

12125-02-9

68

Ammonium fluoride

12125-01-8

18

Ammonium Persulfate

7727-54-0

661

Ammonium; diallyldimethyl-; chloride; polymers

26062-79-3

1

Ampicillin

69-53-4

11

Bentonite, benzyl(hydrogenated tallow alkyl) dimethylammonium stearate complex


121888-68-4


1

Benzoic acid

65-85-0

3

Benzyldimethylammonium chloride

122-18-9

1

Benzyllauryldimethylammonium chloride

139-07-1

1

Boric Acid (H3BO3)

10043-35-3

63

Calcium chloride

10043-52-4

30

Calcium magnesium sodium phosphate frit

65997-18-4

7

Caprylamidopropyl betaine

73772-46-0

9

Cationic polymethacrylamide

86706-87-8

2

Chlorous acid, sodium salt

7758-19-2

3

Choline Chloride

67-48-1

4

Citric Acid

77-92-9

85

Citrus terpenes

94266-47-4

21

Cocamidopropyl betaine

61789-40-0

9

Cocamidopropylamide oxide

68155-09-9

9

Copper dichloride

7447-39-4

18

Corundum

1302-74-5

3

Crosslinked PO/EO-block polymer

68123-18-2

30

Crystalline Silica: Cristobalite

14464-46-1

664

Crystalline silica: Quartz (SiO2)

14808-60-7

1071

Cumene

98-82-8

6

D-Glucitol

50-70-4

2

Diammonium peroxidisulphate

7727-54-0

7

Diatomaceous Earth, Calcined

91053-39-3

850

Constituent Name

CAS Number

Times Used for WST

Dicoco dimethyl quaternary ammonium chloride

61789-77-3

30

Diethanolamine

111-42-2

4

Dimethylbenzylmyristylammonium chloride

139-08-2

1

Dioctyl sulfosuccinate sodium salt

577-11-7

30

Disodium Ethylene Diamine Tetra Acetate (impurity)

139-33-3

1

Disodium octaborate tetrahydrate

12008-41-2

6

D-limonene

5989-27-5

20

Dodecylbenzene sulfonic acid

27176-87-0

4

Enzyme

37288-54-3

11

Erythorbic Acid

89-65-6

7

Ethanol

64-17-5

11

Ethoxylated Alcohol

68131-39-5

1

Ethoxylated alcohol

68439-45-2

1

Ethoxylated alcohol

68603-25-8

1

Ethoxylated Alcohol C12-15

68131-39-5

21

Ethoxylated C11 Alcohol

34398-01-1

1

Ethoxylated Castor Oil

61791-12-6

21

Ethoxylated hexanol

68439-45-2

7

Ethoxylated nonylphenol

68412-53-3

1

Ethoxylated propoxylated 4-nonylphenol-formaldehyde resin

30846-35-6

1

Ethylene Glycol

107-21-1

655

Ethylene glycol monobutyl ether

111-76-2

23

Ethylene Glycol Monobutyl Ether (2-Butoxyethanol)

111-76-2

1

Ethylene oxide

75-21-8

20

Etidronic acid

2809-21-4

1

Food red 10

3734-67-6

1

Formaldehyde

50-00-0

9

Formic Acid

64-18-6

5

Glassy calcium magnesium phosphate

65997-17-3

1

Glutaraldehyde

111-30-8

7

Glycerol

56-81-5

50

Glyoxal

107-22-2

2

Constituent Name

CAS Number

Times Used for WST

Guar Gum

9000-30-0

712

Heavy aromatic naphtha

64742-94-5

1

Hemicellulase enzyme

9012-54-8

8

Hemicellulase Enzyme Concentrate

9025-56-3

657

Hexamethylenetetramine

100-97-0

17

Hydrated magnesium silicate

14807-96-6

30

Hydrochloric acid

7647-01-0

29

Hydrofluoric acid

7664-39-3

1

Hydrogen fluoride (Hydrofluoric acid)

7664-39-3

1

Hydroxylamine hydrochloride

5470-11-1

18

Ingredient Data is listed below as Other

N/A

33

Iron Oxide

1309-37-1

5

Isopropanol

67-63-0

35

Isotridecanol, ethoxylated

9043-30-5

648

Lactose

63-42-3

45

Lactose

9004-34-6

11

Laryl hydrosultaine

13197-76-7

8

Light aromatic naphtha

64742-95-6

6

Magnesium Chloride

7786-30-3

664

Magnesium Nitrate

10377-60-3

664

Methanol

67-56-1

140

Methyl Borate

121-43-7

62

Methyl Isobutyl Ketone

108-10-1

2

Methyl oxirane polymer with oxirane

9003-11-6

31

Mixture of dimer and trimer fatty acids of indefinite compostion derived from tall oil


61790-12-3


19

Mixture of dimer and trimer fatty acids of indefinite compostion derived from tall oil


61788-89-4


2

Modified Polymeric Alkoxylate

52501-07-2

2

Monoethanolamine

141-43-5

4

Monoethanolamine borate

26038-87-9

45

Mullite

1327-36-2

3

Mullite

1302-93-8

1

Constituent Name

CAS Number

Times Used for WST

Naphthalene

91-20-3

6

Nitrilotriacetic acid

139-13-9

1

Nitrilotris (Methylene Phosphonic Acid)

6419-19-8

527

Nitrogen

7727-37-9

1

Non-crystalline silica (impurity)

7631-86-9

38

Nonionic Alkoxylate

70559-25-0

21

Olefin

64743-02-8

6

Oleic acid

112-80-1

30

Orange Terpene

68647-72-3

2

Organic Phosphonate

2809-21-4

1

Organic polyol

112-27-6

21

Organic phosphonate

15827-60-8

2

Organic phosphonate

70714-66-8

2

Oxyalkylated alkylphenolic resin

63428-92-2

6

Oxyalkylated Amine Quat

138879-94-4

277

Oxyalkylated Fatty Acid

61791-00-2

2

Oxyalkylated polyamine

68130-99-4

2

Paraffinic Petroleum Distillate

64742-55-8

648

Petroleum Distillate Blend (3)

8042-47-5

22

Petroleum Distillates

64742-47-8

648

Phenolic resin

9003-35-4

27

Phosphonic Acid

13598-36-2

528

Poly(dimethylaminoethylmethylacrylate) dimethyl sulphate quat.

27103-90-8

23

Poly(oxy-1,2-ethandiyl), a-(nonylphenyl)-w-hydroxy-

9016-45-9

18

Poly(oxy-1;2-ethanediyl);a-hydro-hydroxy- Ethane-1;2-diol; ethoxylated

25322-68-3

1

poly(tetrafluoroethylene)

9002-84-0

61

Polyalkylene

7756-94-7

2

Polyamine Polyethers

68815-69-6

1

Polyamine Polyethers

68815-65-1

1

Polydimethyl diallyl ammonium chloride

26062-79-3

45

Polyethers

68815-65-6

21

Polyethylene glycol monohexyl ether

31726-34-8

30

Constituent Name

CAS Number

Times Used for WST

Polyethylene Glycol Trimethyl Nonyl Ether

84133-50-6

2

Polyethylene oxide

25322-68-3

1

Polylactide resin

9051-89-2

1

Polymer

9003-11-6

1

Polypropylene glycol

25322-69-4

5

Potassium Acetate

127-08-2

1

Potassium Bicarbonate

298-14-6

63

Potassium borate

1332-77-0

30

Potassium Carbonate

584-08-7

64

Potassium Chloride

7447-40-7

16

Potassium hydroxide

1310-58-3

36

Potassium iodide

7681-11-0

4

Potassium oleate

143-18-0

31

Propanol

71-23-8

1

Propargyl Alcohol

107-19-7

28

Propylene glycol

57-55-6

50

Quaternary Ammonium Chloride

61789-71-7

1

Quaternary Ammonium Compound

100765-57-9

2

Quaternary ammonium compounds chlorides derivatives

68989-00-4

1

Reaction product of acetophenone, formaldehyde, thiourea and oleic acid in dimethyl formamide


68527-49-1


19

Silanetrio; (3-aminopropyl, homopolymer

68400-07-7

11

Silica gel

112926-00-8

2

Sodium bisulfite

7631-90-5

46

Sodium bromate

7789-38-0

1

Sodium carbonate

497-19-8

1

Sodium chloride

7647-14-5

392

Sodium citrate

68-04-2

7

Sodium erythorbate

6381-77-7

1

Sodium Glycolate (impurity)

2836-32-0

1

Sodium Hydroxide

1310-73-2

645

Sodium persulfate

7775-27-1

50

Constituent Name

CAS Number

Times Used for WST

Sodium polyacrylate

9003-04-7

51

Sodium sulfate

7757-82-6

50

Sodium sulfite

7757-83-7

1

Sodium Tetraborate

1330-43-4

2

Sodium Tetraborate Decahydrate

1303-96-4

608

Sulferized Polyolefin

68037-13-8

2

Sulfuric acid

7664-93-9

5

Tar bases, quinoline derivs., benzyl chloride quaternized

72480-70-7

2

Tetrakis(hydroxymethyl)phosphonium sulfate

55566-30-8

30

Tetrasodium ethylenediaminetetraacetate

64-02-8

1

Titanium Oxide

13463-67-7

5

Toluene

108-88-3

3

Tricalcium phosphate

7758-87-4

18

Triethanolamine

102-71-6

1

Triethanolamine zirconate

10133-44-7

1

Trisodium Ethylenediaminetetraacetate (impurity)

150-38-9

1

Trisodium nitrilotriacetate (impurity)

5064-31-3

1

Tryptone

73049-73-7

13

Ulexite

1319-33-1

7

Vinylidene Chloride-methylacrylate polymer

25038-72-6

30

Walnut Shells

84012-43-1

3

Xanthan Gum

11138-66-2

7

Xylene

1330-20-7

9

Xylenesulfonic acid

25321-41-9

3

Yeast Extract

8013-01-2

13

Zirconium dichloride oxide

7699-43-6

30

Source: Interim Well Stimulation Database, WST Disclosures Index, operator disclosures

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