Bending Rules with High Build Rate RSS

Abstract

The introduction of a high build rate rotary steerable system (HRSS) capable of delivering in excess of 18°/100 ft DLS resulted in the expectation that this will lead to drilling more wells with higher DLS with RSS. While this paper is not to explore this expectation, it is obvious that this rotary steerable system (RSS) has been used by E&P Operators in the Middle East Region for so many different applications within the operating window of the other existing RSS system. This paper aims to explore in details the unique and ingenious applications, benefits and value of these HRSS systems to the clients in the UAE in terms of optimizing costs and improving drilling efficiency. The traditional method of utilizing a motor for kick-off, sidetrack and exit whipstock was challenged and the broadened operating limits of HRSS were utilized to its full potential to find ingenious ways to perform such operation. The major benefits from these applications are a result of the ability to overcome challenging drilling environments or operational requirements. 22 jobs have been completed in the UAE from Q1, 2012 to date using the HRSS with 100% success rate across the range of applications described below:- Dogleg severity assurance in complex 3D trajectories or through incompetent formations.Kick-off from vertical in various formations with different comprehensive strengths.Cement plugs sidetrack from vertical and shoe to shoe drill ahead to section TD.Sidetrack from whipstock with15 ft rat hole and shoe to shoe drilling with full suite of logging tools. The increasing demand for this service and creation of a niche, even in the current environment of demanding cost optimization and value based technology, the application of this technology has led to an estimated saving in excess of 40 days. The non-tangible benefits include better hole cleaning and smoother wellbores leading to less wellbore tortuosity and improved ability trip post drilling with drilling, logging and casing assemblies. The asset teams are not left out as the near bit measurements in theses assemblies also aid in reduction of the uncertainties and enable better decision making, especially while landing the well or at TD point selection. The applications of HRSS described in the paper are innovative applications designed through immaculate planning and risk mitigation. As a result of which significant achievements in cost optimization and drilling efficiency enhancement have been realized.