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 <strong>Surgil</strong> field zation immediately on the sector objects. In this connection, it is necessary to carry the organization and maintenance of research and engineering developments of such units, creation of effective remedies and methods of wastes processing and neutralization to number of priorities both at regional level, and at level of the enterprises. 5.9. Drilling wastes qualitative and quantitative composition is basic at a choice of their recycling method. Drilling wastes recycling technologies choice is carried out proceeding from principles of a state policy in the field of the handling with production and consumption wastes which is directed to reduction of wastes amount, their involving in economic circulation and fuller use of natural resources. 5.10. Now the most known technologies of drilling wastes processing are based on the following methods: Thermal – incineration in open barns, furnaces of various types, reception of bituminous leavings. Physical – disposal in special burials, separation in a centrifugal field, vacuum filtering and filtering under pressure. Chemical – extraction by solvents, hardening with application (cement, liquid glass, clay) and organic (epoxy and polystyrene resins, polyurethanes, etc.) additives. Physiochemical - application of specially selected reagents changing physiochemical properties, with the following processing on the special equipment. Biological - microbiological decomposition in soil immediately in storage places, biothermal decomposition. Mechanical - drilling wastes pumping in lost circulation horizons. 5.11. Now it is known about application of the following methods (and their combinations) of drilling wastes neutralization and processing: drilling cuttings incineration in the form of aqueous emulsions and recycling of released heat and gases; drilling cuttings dewatering or drying with return of oil products to production, and sewage waters in turnaround circulation and the following disposal of the hard leavings; drilling cuttings hardening by special consolidating compositions with the following use in other sectors of the national economy, or disposal in special landfills; drilling cuttings use as raw materials (components of other sectors of the national economy); drilling cuttings physiochemical separation (solvents, demulsifying agents, SAS, etc.) on component phases with the following use. 5.12. Works basic directions in the field of semi-fluid drilling wastes neutralization (drilling cuttings and WDM hard phase) concentrate on physiochemical neutralization and hardening. A priority direction of neutralization is their hardening, realized by special hardeners. 5.13. Neutralizing effect is achieved at the expense of drilling wastes transformation into the inert consolidated mass in which structure the basic polluting components are fixed. Such mass can be buried in lands for alignment of the lay of land, for filling in body of roads under construction, etc., without environmental damage. Adding to wastes such active additives allows, besides, to receive hardened mass enduring a load which is created by the transport. 5.14. Solid preservative matrix formed at hardening prevents dissolution of toxic substances under the influence of environment components, additionally fix them physically and chemically, reduces surface contact area with environment. - 10 -
“Management of Ustyurt GCC infrastructure objects and <strong>Surgil</strong> GCF construction” UE » 5.15. Cuttings neutralization is carried out by mixture in certain proportions with sorbent and cement. As a result of such processing, the organic substances which are presented in cuttings fixed by added sorbents. Cement and sorbent at mixture with cuttings in the water presence keep up high value рН (to 12) in system. Thus, heavy metals cations containing in cuttings, turning into sparingly soluble hydroxides composition. 5.16. Following wastes hardening, proceeding as a result of cement hydration processes added to the system, leads to more firm fixing of the neutralized toxic compounds and prevention of their following dissolution during environmental impact. The product received as a result of neutralization can be used in construction. 5.17. At the drawing up of this Management Procedure, there are realized following technologies of drilling recycling and cuttings barns liquidation in the territory of the Republic of Uzbekistan: in “LUKOIL Uzbekistan Operating Company” Co. Ltd., – drilling wastes recycling of Khauzak Site on specialised Landfill with production output according to TSh 64-19577541- 01:2008 “Reinforced anthropogenic grounds” and TSh 64-19577541-02:2008 “Treated drilling sewage water”; in “LUKOIL Uzbekistan Operating Company” Co. Ltd., - drilling wastes recycling and cuttings barns liquidation at objects of the Southwest Gissar according to “Management Procedure of drilling cuttings (DC) neutralization and hardening for its following disposal in cuttings barns (CB) in the contract territories of the Southwest Gissar (correction)”; in “LUKOIL Uzbekistan Operating Company” Co. Ltd., - drilling wastes recycling and cuttings barns liquidation on the Site of Kandym group of deposits according to “Management Procedure of drilling wastes recycling during production wells construction on the site of Kandym group of deposits”; In “LUKOIL Uzbekistan Operating Company” Co. Ltd., - drilling wastes recycling during production wells construction on the Shady Site according to “Management Procedure of drilling wastes recycling during production wells construction on the Shady site”. - 11 -
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Surgil ESIA Report - Volume III - EKN

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