(EIA/EMP) Proposed Onshore Oil and Gas Developm
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DRAFT ENVIRONMENTAL IMPACT ASSESSMENT REPORT & ENVIRONMENTAL MANAGEMENT PLAN (EIA/EMP) for Proposed Onshore Oil and Gas Development & Production from KG/ONDSF/KAZA/2018 Block, Krishna District, Andhra Pradesh By Vedanta Limited. (Division: Cairn Oil & Gas) Block Area: 114.93 km2 No. of Well: 35 Production Capacity: 30,000 Barrels of Oil per Day (BOPD) and 30 Million Metric Standard Cubic Feet (MMSCFD) of gas [ToR Letter No: IA-J-11011/52/2020-IA-II (I) dated 02 April 2020] [Monitoring period: 1st December 2019 to 29th February 2020] [Monitoring done by In-house laboratory (NABL Accreditation TC-6603 MOEFCC No. S.O. 5768 (E).—S.No. 169) [Schedule 1 (b) Category–“A” As per EIA Notification 2006 and its Amendment thereof] ENVIRONMENTAL CONSULTANT ECO CHEM SALES & SERVICES Office Floor, Ashoka Pavilion - A New Civil Road, Surat, 395001 NABET/EIA/1720/SA 085 E-mail: [email protected] Tel No. +91 261 2231630 Doc No: 2020_ECSS_EIAI2_2000002 October 2020 Eco Chem Sales and Services Doc. No. 2020_ECSS_EIAI2_2000002 Page | Proposed Onshore Oil and Gas Development & Production from KG/ONDSF/KAZA/2018 Block, Krishna District, Andhra Pradesh By Vedanta Limited. (Division: Cairn Oil & Gas) NABET CERTIFICATE Eco Chem Sales and Services Doc. No. 2020_ECSS_EIAI2_2000002 Page | I Proposed Onshore Oil and Gas Development & Production from KG/ONDSF/KAZA/2018 Block, Krishna District, Andhra Pradesh By Vedanta Limited. (Division: Cairn Oil & Gas) Eco Chem Sales and Services Doc. No. 2020_ECSS_EIAI2_2000002 Page | II Proposed Onshore Oil and Gas Development & Production from KG/ONDSF/KAZA/2018 Block, Krishna District, Andhra Pradesh By Vedanta Limited. (Division: Cairn Oil & Gas) Eco Chem Sales and Services Doc. No. 2020_ECSS_EIAI2_2000002 Page | III Proposed Onshore Oil and Gas Development & Production from KG/ONDSF/KAZA/2018 Block, Krishna District, Andhra Pradesh By Vedanta Limited. (Division: Cairn Oil & Gas) Eco Chem Sales and Services Doc. No. 2020_ECSS_EIAI2_2000002 Page | IV Proposed Onshore Oil and Gas Development & Production from KG/ONDSF/KAZA/2018 Block, Krishna District, Andhra Pradesh By Vedanta Limited. (Division: Cairn Oil & Gas) Eco Chem Sales and Services Doc. No. 2020_ECSS_EIAI2_2000002 Page | V Proposed Onshore Oil and Gas Development & Production from KG/ONDSF/KAZA/2018 Block, Krishna District, Andhra Pradesh By Vedanta Limited. (Division: Cairn Oil & Gas) UNDERTAKING BY CONSULTANT Eco Chem Sales and Services Doc. No. 2020_ECSS_EIAI2_2000002 Page | VI Proposed Onshore Oil and Gas Development & Production from KG/ONDSF/KAZA/2018 Block, Krishna District, Andhra Pradesh By Vedanta Limited. (Division: Cairn Oil & Gas) UNDERTAKING BY PROJECT PROPONENT Eco Chem Sales and Services Doc. No. 2020_ECSS_EIAI2_2000002 Page | VII Proposed Onshore Oil and Gas Development & Production from KG/ONDSF/KAZA/2018 Block, Krishna District, Andhra Pradesh By Vedanta Limited. (Division: Cairn Oil & Gas) EXECUTIVE SUMMARY 1.0 INTRODUCTION 1. As part of the Government’s effort to increase domestic production, Discovered Small Field (DSF) Policy was introduced for fast-tracking the monetization of un-monetized small fields/ discoveries of National Oil Companies (NOCs) under Nomination regime and relinquished discoveries under the PSC regime. KG/ONDSF/KAZA/2018 Onshore Block was awarded to Vedanta Limited under discovered small field (DSF) Policy. This KAZA block was awarded to Vedanta Ltd in DSF Round-II in 2018. Cairn Oil & Gas Division of Vedanta Limited will operate the Kaza block with 100% Participating Interest. The proposed project is green field in nature. 2. KG/ONDSF/KAZA/2018 is onshore Block located in Krishna District of Andhra Pradesh. The 35 wells are located in Kaza Block covering four Mandal’s of Krishna District. The proposed 35 no’s of the hydrocarbon wells to be drilled are distributed as 14 wells in Mova Mandal; 18 wells in Gudur Mandal; two wells in Kalidindi and one well in Machilipatnam. ONGC has drilled three exploratory wells in the year 1985 in the Kaza structure. Out of the three wells, two wells were found to be dry wells and one well found to have gas discovery. The successful exploration well has discovered gas in Raghavapuram sands, possibility of occurrence of oil cannot be ruled out. Based on the data obtained from the successful gas well, the reservoir properties are moderate. It was noted that further gas extraction is possible through hydro-fracture of the well. All the earlier wells were drilled in the depth of ~ 2300 m below the ground level. It is understood that the accumulated hydrocarbons are due to long distance migration from the deeper parts of the depression adjacent to the Kaza high. 3. As per Environmental Impact Assessment EIA Notification dated 14th September, 2006, the project falls under category ‘A’ of Schedule 1(b) - Offshore and onshore oil and gas exploration, development & production; and requires prior Environmental Clearance (EC), which is to be obtained from MoEF&CC before the commencement of ground activity. The application for prior EC (Form-1 and Pre-feasibility Report) had been submitted to MoEF&CC on 12th February 2020. In this regard, under the provisions of the EIA Notification 2006 as amended, the Standard TOR has been granted by MOEF&CC vide letter reference F.No. No. IA-J-11011/52/2020-IA-II (I) dated 02nd April 2020 for the purpose of preparing environment impact assessment report and environment management plan. 2.0 PROJECT DESCRIPTION Project brief The proposed project is a Greenfield in nature and to carryout development well drilling, production and export of oil & gas from the block KG/ONDSF/KAZA/2018 at Krishna district of Andhra Pradesh. The geographic location of the block is included within the Survey of India’s Topo- Sheet No. E44U15, E44U16, E44V3, E44V4. The following are the three major activities proposed as part of the Kaza Block development. 1. Drilling of 35 hydrocarbon wells within the Kaza block area 2. Development of ten well pads to setup the hydrocarbon processing facilities and produce up to 30,000 Barrels of Oil per day and 30 Million Metric standard Cubic Feet of gas per day. Each well pad will be of size maximum 300 m x 300 m (say 9 hectare each). 3. Laying of separate gas pipeline from the developed well pads and connecting to the main header pipeline already laid by GAIL and MEIL. Project-related Facilities A. Process description for Drilling of 35 Hydrocarbon Wells The locations for the drilling of 35 wells have been identified, however the actual well location will be fixed once the detailed interpretation of the already acquired seismic data is completed. The proposed well depths vary up to 2400 m due to the subsurface structural configuration and the depth of occurrence of the primary reservoirs. Typically, estimated drilling duration of the well drilling and completion is between 45 – 60 days/ well. In addition, well testing will be carried out for the duration of 30 to 60 days/well to ascertain the reservoir parameters. Water Base Mud (WBM) will be used as drilling fluid for initial, shallower sections. The deeper and difficult to drill geological formations will be drilled using Synthetic Oil Base Mud (SOBM) as drilling fluid. All the proposed 35 wells are within the Block and will be drilled using an Electric Land Rig of around 1500 HP capacity, equipped with a Rotary/Top Drive System. The rig & associated services will have the following provisions: • Portable Camps – to provide stay facilities for the around 80 drilling crew members. Eco Chem Sales and Services Doc. No. 2020_ECSS_EIAI2_2000002 Page | VIII Proposed Onshore Oil and Gas Development & Production from KG/ONDSF/KAZA/2018 Block, Krishna District, Andhra Pradesh By Vedanta Limited. (Division: Cairn Oil & Gas) • Crane-age - cranes for loading/offloading equipment and supplies. • Emergency Systems - it includes fire detection and protection equipment. • Environmental Protection – Blow out Prevention (BOP) system, wastewater treatment unit and drill cuttings and drilling mud handling equipment. Additionally, there will be other ancillary facilities like Drilling mud system, ETP, Cuttings storage pit and disposal facilities, Drill Cementing equipment etc., and utilities to supply Power (DG sets), water, fuel (HSD) to the drilling process. The following are the various phases of the drilling activities and their process respectively. • Site selection after Subsurface Target Identification; • Land acquisition either on lease or permanent land; • Site and access road preparation; • Drilling activities; • Well testing; • Complete the well and suspend for production; and • Decommissioning & closure of wells in case dry wells (no hydrocarbon found or non-viability of extraction or no commercial value available) B. Process description of Hydrocarbon Production up to 30,000 Barrels of Oil per day and 30 Million Metric standard Cubic Feet of gas per day A. Process Description – Crude oil and associated gas produced from the wells Each well pad will be a standalone unit and will include single / multiple well heads - a collection header (manifold), phase separation (three phase), oil storage / export and necessary utilities such as warehouse, camp site, power generation, firefighting system and treatment systems. Well Fluid Collection: The well fluids from the wells will be controlled through the opening of the choke valve and routed to inlet separator. Multiphase fluids from the wells / well pads will be processed in at each well pad. Gas will be separated from the oil and will be used as fuel gas within the facility for process heating, power generation etc. Oil will be stored in the well pads and then exported through road tankers. The separated water will be routed through oil water separator, from which it will be disposed through evaporation pond / dump well based on the quantum of generation. Phase Separation: Oil will be separated from the flashed gas in the three-phase separator. Product Oil Storage and Export: Crude oil from the separator flows by gravity to the product oil storage tanks. Crude is stored at atmospheric pressure in multiple tanks.