HELP Hydrocarbon Exploration and Licensing Policy

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Tamil Research Institution (TRI) 5450 metres with maximum mud weight of 2.05 g.cc and reservoir temperature was more than 450 deg F. Due care was taken to ensure safe operations and safety of the well. Clear fluid comprising Calcium Bromide and Zinc Bromide was used during testing for desired pressure transmission for DST operation of different downhole valves. This technology enabled us to give stage wise cycling of the recirculation valves in the DST string, thus different predetermined drawdown could be given for activation. This also eliminated the use of CTU in 15 K well for repeated activation. n. Some of the new technologies for HPHT fields: Ceramic Sand Screens having exceptional resistance to erosion/ corrosion and outstanding hardness. It is touted to be useful in offshore wells and HPHT wells. Corrosion resistant alloys for casing liners and tubings. HPHT FB-3 Retainer Production Packer-Used in more than 5 wells in ONGC Mumbai High and Rajahmundry Assets. 8.1.10 IOR/EOR EFFORTS IN ONGC: ONGC puts efforts on continual basis for performance analysis of fields and suitable technology & corrective measures are taken for improvement in crude oil production. Improved Oil Recovery (lOR)/Enhanced Oil Recovery (EOR) schemes were formulated by ONGC for improvement in production in its 15 major fields viz. Mumbai High, Heera, Neelam, Gandhar, Kalal, North KadiSanand, Santhal, Balol, Sobhasan, Jotana, Lanwa in Gujarat; Lakwa-Lakhmani, Geleki Rudrasagar in Assam. These I0R/EOR schemes helped in arresting the decline trend of oil production. The status of current IOR/EOR projects is tabulated as under: (Table 8.4) Sl. No. Field 1 Mumbai High- North 2 Mumbai High- South Scheme IOR-Redevelopment Phase-III IOR-Redevelopment Phase-III 3 Heera IOR-Redevelopment Phase-II 4 Neelam Neelam Redevelopment Plan 5 Sanand EOR-(Polymer Flood) On stream 6 Balol EOR-(Insitu Combustion) 7 Santhal EOR-(Insitu Combustion) Status of IOR/EOR Project Under implementation Under implementation Under implementation Under implementation On stream The closure report of present ongoing scheme submitted for approval. New FR prepared and is under review. 8 Gandhar (GS-11) EOR-(WAG) Under implementation 9 Jhalora EOR-ASP (Field expansion) 10 Viraj EOR-ASP (Field expansion) Under approval Under approval Enhanced Oil Recovery (EOR) Polymer Flooding/WAG/PM/WSO: »» Simulation of Polymer Flood study was carried out in Bechraji Field. Polymer flooding recommended for normal five spot pattern. The study envisages 8% incremental oil recovery by 2019 over water-flood. »» Simulation of Gandhar Field Water Alternate Gas injection (GS-9) full field expansion study was carried out. The study also identified two additional closed pilot areas before the finalization of FR for full field expansion. »» Profile Modification (PM) jobs were carried out successfully in Neelam & Heera fields. Water shut Off (WSO) jobs were carried out in Ankleshwar & Jambusar fields of Ankleshwar Asset. The incremental oil gain of 94772 m 3 was achieved by application of PM and WSO jobs during FY 2015-16. Microbial EOR (MEOR): ONGC has also applied its indigenously developed technology of Microbial EOR process to increase production from sub-optimally flowing wells in different fields of ONGC. By application of microbial paraffin control technology, another MEOR process, field jobs have been carried out for improving well productivity by reducing frequency of scrapping to avoid wax deposition in wells of Mehsana and Ankleshwar fields. Indigenously developed MEOR formulations have been successfully applied for improving flow efficiency of surface flow 120 Technology Initiatives www.tamilri.com
Tamil Research Institution (TRI) India's Hydrocarbon Outlook : 2015-16 lines. It has been observed that >80 % wells are scrapping free after the job application. Thermal EOR: ONGC has approved implementation of Cyclic Steam Stimulation (CSS) as a pilot project in Lanwa field. The study envisaged incremental oil gain of 0.32 MMT in 8 years. Chemical EOR: Way forward laboratory study for Sanand Field polymer flood project was carried out with increased concentration of Polymer and ASP Flooding to enhance Linear Core Displacement Efficiency (LCDE) over existing Polymer flood. The study envisages 15 % additional LCDE over polymer flood. Simulation Study of Alkali-Surfactant in K-VA was carried out after successful encouraging results in laboratory. Laboratory chemical EOR studies in Northern part of North Kadi field was carried out. Laboratory results are encouraging with 12% additional LCDE with Polymer Flood and 22% additional LCDE with Alkali-Surfactant-Polymer (ASP) flood. Preparation of Integrated Geo-cellular Models (GCM): As an important initiative to move from conventional map-based Geological model to fine scale Geocellular Model (GCM), IRS has taken lead in preparing GCMs of major fields in recent past in order to address issues of brownfield development by capturing reservoir heterogeneity, improved water flooding efficiency, optimizing infill drilling, etc. During FY 2015-16, GCM of Gandhar (GS-3A, 3B, 5C, 8 and 11), Limbodra, NBP (Revisit), B-192 and G-1 were taken up. 8.2 CAIRN 8.2.1 IOR/EOR Mangla EOR: One of the largest polymer flood implementation execution was completed in Mangla Oil field (block RJ-ON-90/1). The surface facilities and drilling activities were completed and polymer injection was ramped up to the target 400,000 Barrels of polymerized injection water per day during the 4 th quarter of the FY 2016. This is a significant achievement for the block which will enhance the production from this field. Incremental oil production in the range of ~20, 000 BOPD is being produced from EOR which is as per expectations of the FDP. Drilling of the FDP wells have been completed and few wells surface facilities hookup is ongoing. The Rajasthan block have similar field in the blocks such as Bhagyam and Aishwariya which are good candidates for chemical EOR. Screening and core flood studies have been completed and field implementation development plans for converting these fields on water flood to chemical EOR floods is under progress. The Mangla ASP pilot was concluded after drilling core wells and the recovery from the pilot area was ascertained. The results from the pilot were very promising and further work is ongoing to prepare a development plan based on the results of the pilot. Bhagyam and Aishwariya ASP studies were also initiated. www.tamilri.com 121
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