Optimization of deviated and horizontal wells trajectories and profiles in rumaila oilfield

Abstract EN

Directional and horizontal wellbore profiles and optimization of trajectory to minimize borehole problems are considered the most important part in well planning and design.

This study introduces four types of directional and horizontal wells trajectory plans for Rumaila oilfield by selecting the suitable kick off point (KOP), build section, drop section and horizontal profile.

In addition to the optimized inclination and orientation which was selected based on Rumaila oilfield geomechanics and wellbore stability analysis so that the optimum trajectory could be drilled with minimum wellbore instability problems.

The four recommended types of deviated wellbore trajectories include: Type I (also called Build and Hold Trajectory or L shape) which target shallow to medium reservoirs with low inclination (20o) and less than 500m step out, Type II (S shape) that can be used to penetrate far off reservoir vertically, Type III (also called Deep Kick off wells or J shape) these wells are similar to the L shape profile except the kickoff point is at a deeper depth, and design to reach far-off targets (>500m step out) with more than 30o inclination, and finally Type IV (horizontal) that penetrates the reservoir horizontally at 90o.

The study also recommended the suitable drilling mud density that can control wellbore failure for the four types of wellbore Directional and horizontal wellbore profiles and optimization of trajectory to minimize borehole problems are considered the most important part in well planning and design.

This study introduces four types of directional and horizontal wells trajectory plans for Rumaila oilfield by selecting the suitable kick off point (KOP), build section, drop section and horizontal profile.

In addition to the optimized inclination and orientation which was selected based on Rumaila oilfield geomechanics and wellbore stability analysis so that the optimum trajectory could be drilled with minimum wellbore instability problems.

The four recommended types of deviated wellbore trajectories include: Type I (also called Build and Hold Trajectory or L shape) which target shallow to medium reservoirs with low inclination (20o) and less than 500m step out, Type II (S shape) that can be used to penetrate far off reservoir vertically, Type III (also called Deep Kick off wells or J shape) these wells are similar to the L shape profile except the kickoff point is at a deeper depth, and design to reach far-off targets (>500m step out) with more than 30o inclination, and finally Type IV (horizontal) that penetrates the reservoir horizontally at 90o.

The study also recommended the suitable drilling mud density that can control wellbore failure for the four types of wellbore trajectory.