JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives

This course is designed to provide the broad background, necessary to

understand and successfully apply the technology of horizontal wells at various elevations. The course provides various methods for predicting well performance based on expected production rate, drainage area, and fluid coning.

Course Outcome

The student would be able to understand recent well construction

technologies and the reservoir characteristics required for designing horizontal wells and would study specialized drilling strategies like horizontal ones.

UNIT - I

Overview of horizontal well technology: Introduction- Limitations of horizontal wells- Horizontal well applications- Drilling techniques- Horizontal well length based upon drilling techniques and drainage area limitations- Completion techniques. Reservoir engineering concepts: Skin factor- Skin damage for horizontal wells- Effective wellbore radius r’w- Productivity index, f- Flow regimes- Influence of areal anisotropy.

UNIT - II

Steady-state solutions: Steady-state productivity of horizontal wells- Effective wellbore radius of a horizontal well- Productivity of slant wells- Comparison of slant well and horizontal well productivities- Formation damage in horizontal wells- Field histories. Influence of well eccentricity: Introduction- Influence of well eccentricity- Drilling several wells- Horizontal wells at different elevations.

UNIT - III

Transient well testing: Introduction-Mathematical solutions and their practical implications- Generalized flow regimes- Pressure response- Detailed well testing flow regimes- Pressure directivities- Wellbore storage effects- Practical Considerations.

UNIT - IV

Pseudo-steady state flow: Shape factors of horizontal wells- Horizontal well pseudo-steady state productivity calculations- Inflow performance of partially open horizontal wells- Inflow performance relationship (IPR) for horizontal wells in solution gas-drive reservoirs- Predicting horizontal well performance in solution gas-drive reservoirs.

UNIT - V

Water and gas coning in horizontal wells: Critical rate definition- Water and gas coning in horizontal wells- Horizontal well breakthrough time in a bottom- Water drive reservoir- Breakthrough time for a horizontal well in a reservoir with gas cap or bottom water- Cone

R16 B.TECH PETROLEUM ENGG.

breakthrough time for horizontal wells in reservoir with both gas cap and bottom water- Critical rate for horizontal well in edge-water drive reservoir practical considerations- Field Histories.

TEXT BOOK:

• 1. Horizontal Well Technology, S. D. Joshi, PennWell Publishing Company, 1991.

REFERENCE BOOK:

• 1. Horizontal Wells: Formation Evaluation, Drilling and Production Including Heavy Oil Recovery, Roberto Aguilera, G. M. Cordell, G. W. Nicholl, J. S. Artindete, M. C. Nq., Gulf Publishing Co., 1991. R16 B.TECH PETROLEUM ENGG.