Schlumberger

Technical Paper: Well Optimization with Rotary Steerable Systems for Well Designs

Society: AADE
Paper Number: 09-ntce-05-05
Presentation Date: 2009
 

Abstract

Throughout the oil and gas industry, the value of rotary steerable systems (RSS) has easily been quantified due to the enhancement of effective "on bottom" rate of penetration (ROP). Many other benefits, such as smoother borehole and improved hole cleaning, have been more difficult to equate.

This paper will highlight changes that have been made to the fundamental well trajectory design process to better suit the application of RSS directional drilling systems. It also quantifies additional benefits that go beyond the more tangible benefits of "on bottom" penetration rates. These benefits can include using Water-Based Mud (WBM) with RSS tools rather than the more expensive Oil-Based Mud (OBM) systems, and reducing the necessity to rent larger drillpipe or specialty high torque drillpipe. The ultimate result is a better optimized drilling program with the ability to increase the well complexity without the need for specialty items, products, procedures or a larger rig.

This procedure is completed through an analysis of the different tortuosity levels created by various drilling assemblies while drilling a borehole. The analysis can then assist in decision-making on what drilling assembly will mitigate the highest risks and at what point in the well to utilize the systems described herein.

This paper will conclude with investigations into actual wellbore data which will give quantifiable optimization figures over traditional drilling assemblies of positive displacement motors (PDM). The data could in turn be used to extend existing limits in developed fields.