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Mr. Ainger
To ask the President of the Board of Trade if he will list the type and quantity in tonnes of (a) drilling chemicals and (b) production chemicals notified to him as discharged by offshore operations in each year since 1979; and what is his best estimate of the proportion this represents in each year of the total amount of each chemical discharged into United Kingdom waters.
| Chemicals used/discharged 1991 | |||
| Chemical Product | Drilling | Production | Quantity (tonnes) discharged |
| Antifoam | X | X | 5 |
| Asphalts/asphalt based products | X | 32 | |
| Biocides | X | X | 252 |
| Carrier Solvent | X | X | 1 |
| Coagulants/Deoilers | X | X | 119 |
| Corrosion inhibitors | X | X | 568 |
| Cutting wash fluids | X | 16 | |
| Defoamers | X | 83 | |
| Demulsifiers | X | 119 | |
| Detergents/Cleaning fluids | X | 742 | |
| Dispersants | X | 268 | |
| Drilling lubricants | X | 163 | |
| Dyes | X | 32 | |
| Emulsifiers | X | 565 | |
| Fluid loss control | X | 628 | |
| Gas Treatment | X | 1,934 | |
| Gels | X | 5,361 | |
| Inorganic chemicals | X | 24,873 | |
| Lignosulphonates lignites | X | 245 | |
| Lost circulation material | X | 1,882 | |
| Oxygen scavengers | X | 116 | |
| Polymeric viscosifiers and filtrate reducers | X | 2,577 | |
| Shale inhibitors | X | X | 3,300 |
| Shale inhibitors/encapsulators | X | 1,100 | |
| Thinners | X | 83 | |
| Viscosifiers | X | 3,284 | |
| Weighting agents and inorganic gelling agents | X | 152,649 | |
| Total | 200,997 | ||