Abstract
Mumbai High field discovered in the year 1974, is located in Western Offshore of India, 160 km South West off Mumbai City. The field was put on production in May 1976. The field achieved a peak production of about 400,000 BOPD during year 1984. To maintain reservoir pressure, suitable water injection scheme was put in place in 1984-85. The field is currently operating on gas lift mode of artificial lift. The field is in now matured stage.
There is a vast gap in demand and supply of hydrocarbons in India. Country import about 66% of its crude oil requirements. Current high rise in prices of crude oil necessitated increased efforts by National Oil Company (ONGC) to enhance production by about 0.5 MMT from the committed targets. Indian offshore being the 70% contributor of domestic crude oil, special focus was accorded to these fields.
Mumbai High being largest field in Offshore, a systematic planning and monitoring of action plan were adhered. To augment the production from this matured field, as a short-term measure, a multi-disciplinary team (MDT) was formed. The team brought out the action plan in August-2000 and implementation started in September-2000. The four types of jobs were planned for Bombay High field viz. Drilling of new development wells, diversion of existing well location to new location by long-drift side-track (LDST), cost effective innovative stimulation jobs, additional perforations in some of the existing producers. All these four types of jobs were carried out within the available resources like drilling rig, stimulation vessel and marine survey unit (MSU). The systematic monitoring of these actions has led to a learning curve for future. In addition to this, some of the wells were taken up for other remedial jobs like surface modifications to reduce backpressure in some well platforms, work-over jobs, scale removal jobs etc. By close monitoring of each well and associated action, the planned additional targets of 0.5 MMT up to March-2001 were achieved.
The present paper describes the details of new development wells drilled using non-damaging drilling mud, diversion of existing well location to new location using the existing slot using LDST, innovative stimulation technique and additional perforations. For each of these activities, a detailed analysis has been made and learning curve drawn for future.
