27-06-2012, 12:54 PM
A Practical Training At OIL INDIA LIMITED
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Company Profile
Introduction:
Oil India ltd is a premier National oil company, engaged in the business of Exploration, Production and Transportation of crude oil and natural gas. Oil India Ltd is a Schedule “A” company and has been awarded a “NAVRATNA” status under the Ministry of Petroleum and Natural Gas, Government of India. OIL is Asia’s oldest and one of the biggest oil exploration and production company. OIL's presence is currently in nine nations of world. In India its operations, both on-shore and off-shore spreads across the country. OIL’s strategy is to establish commercial reserves from strategic positions in high potential exploration plays in order to create and deliver shareholder value.
OIL’s expertise is in six major sectors viz. Exploration, Drilling & Workover, Production, Reservoir Management, Pipeline and Research & Development. Company is into strategic alliance with many major companies for its various in-country and overseas operations. The Company has been consistently showing excellent financial performance over the years and has been able to build up a strong base.
OIL has over 1 lakh sq km of PEL/ML areas for its exploration and production activities, most of it in the Indian North East, which accounts for its entire crude oil production and majority of gas production. Rajasthan is the other producing area of OIL, contributing 10 per cent of its total gas production.
Geological model of Rajasthan
The Jaisalmer basin is a part of westerly dipping eastern limb of lower and middle Indus basin DSand existed as essentially passive margin basin on the edge of Indian plate. A number of significant tectonic events effecting evolution of the basin, mostly related to successive stages in the break-up of Gondwanaland took place throughout the Mesozoic. The initial stage in the break-up of Gondwanaland was marked by rifting of Indian plate from the eastern margin of Africa during the Permian and Mesozoic. The stratigraphy of the basin at this time reflects the break-up, with coarse clastic sedimentation having taken place during the Permian.
Conclusion
The gas produced at the Oil’s Rajasthan field predominantly has more percentage of CO2 which is undesirable and reduces the calorific value of the produced gas. Hence, the economics from selling this gas is less compared to the economics by selling the gas having low percentage of CO2. This can be achieved by installing a suitable CO2 stripping plant to remove the excess CO2. The removed CO2 may be utilized for fertilizers plants and other industries. The gas production rate has been primarily controlled by the demand of the consumers.
Another common problem for the wells is water loading due to presence of bottom water drive mechanism. The wells should be produced at a low bean to maintain the back pressure and cement integrity should be checked by recording cement bond logs and advanced logs such as CAST-V or USIT for identification of channeling behind the casing and casing integrity.