--> Abstract: Horizontal Well-A Case Study From Western Offshore, India, by J. M. Joshi, G. Hazarika, and B. K. Tiwart; #90942 (1997).

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Abstract: Horizontal Well-A Case Study From Western Offshore, India

JOSHI, J.M., G. HAZARIKA, and B.K. TIWART

Horizontal wells have created promising concept of drainage architecture. Horizontal wells are currently being drilled for primary field development as well as secondary/enhanced recovery schemes such as water injection and steam injection processes, etc. In India the first horizontal well was drilled in giant Bombay High field, western offshore, in 1990.

Giant Bombay High oil field was discovered in 1974. Structurally the field is a north-northwest to south-southeast treading doubly plunging anticline. An Upper carbonate pay zone of Upper Miocene age, developed mainly in North but shaly in South was the focus area for horizontal well drilling. Two horizontal wells were drilled during 1990 and were completed in one of the sublayer of the reservoir. After performance evaluation and sustained production of the first two horizontal wells, several laterals along with vertical/inclined holes were placed for optimum development/exploitation of the reservoir. The application, benefits and performance evaluation of these horizontal wells are compared with conventional wells drilled for exploitation of the formation. The important parameters which affect the performance of horizontal wells like permeability, anisotropy and wellbore damage have been evaluated using suitable flow and geological models. The present analysis indicates that the success of a horizontal well depends upon the screening of various selection criteria as well as a proper reservoir description and appropriate model study for optimization of wellbore length. The field results are presented.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria