Surgil ESIA Report - Volume III - EKN

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Management procedure of the drilling wastes (cuttings barns) recycling, generated during production wells drilling in Surgil field 7.8. Soda ash represents a powder of white color by density of 2.5/sm 3 . Soda is received from СаСО 3 . Its additives make to 0.5% in dry and 2-3% in the form of 5-15% concentration solution. Sometimes it applies as alkali substitute during lignin-alkaline reagent preparation or for nitrolignin dissolution, wood-chemical polyphenol and other reagents. It is also applied during mud preparation from calcium clays for improvement of wettability of clay particles and as clay peptizing agent. 7.9. Graphite represents the crystal silver powder which is not dissolved in water. It is formed by foam concentration of natural graphite ores and blast-furnace scraps. Graphite additives make to 1% from solution bulk. Graphite is delivered in bags by 30-35kg. 7.10. FCLS - ferrochrome lignosulfonate, non-caking loose powder of dark brown color, completely soluble in water, is applied for drilling mud dilution, thickening from clay, various salts and temperature effect, and also for decrease in filtration of fresh and medium mineralized mud. Described effect it shows at рН 8.5-9.5. FCLS can be applied in the form of 30-40% water solution or in the form of dry powder. Dry FCLS is nontoxic and does not cause allergy. It is necessary to use rubber gloves and safety glasses during work with FCLS water solution. It is stored in bags, there is possible considerable dispersion during bags opening; dust is non-explosive to concentration 250/m 3 . Pack into four-layer paper bags with the varnished layer by 40 kg weight. 7.11. Reagent К-4 receives by incomplete hydrolysis of polyacrylonitrile with caustic soda under mixture ratio 2.5:1. It is developed by IGIRNIGM, produced in the form of 10% water solutions. During introduction of small amount (0.1-0.5%) of reagent К-4 in mineralized drilling mud their water loss in limiting static shear stress is sharply decreases. With К-4 concentration increase in the drilling mud over 0.3% the water loss continues to decrease, and limiting static shear stress increases in contrast to CMC effect. 7.12. CMC is the powder of white or cream color which is rather slowly dissolved in cold water. Solubility can be accelerated it several times by the adding in water to 1% from reagent sulfonal weight. 7.13. Calculation of drilling mud toxicity class provided by the Group working draft for production wells construction in Surgil field is carried out by method stated in “Criteria of wastes reference to danger class for environment” confirmed by the order № 511 of the Ministry of Natural Resources of the RF from June, 15, 2001 7.14. Results of calculations are resulted in tables P4.2-P4.5 (Appendix 4). These calculations show, only on well drilling interval under direction the recommended drilling mud is IV danger class – low-hazard wastes (waste danger degree index for E K = 96.0
“Management of Ustyurt GCC infrastructure objects and Surgil GCF construction” UE » analyses on neutralizations of the oil-polluted soils/grounds, there is possible WDM disposal in cuttings barns immediately in the territory of drilling site. - 17 -
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Книга 2. Часть 2. Про
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NATIONAL HOLDING COMPANY «UZBEKNEF
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