Extended Reach Drilling (ERD) is directional drilling of very long non-vertical wells. The aims of ERD are: a) to reach a larger area from one surface drilling location, and b) to keep a well in a reservoir for a longer distance in order to maximize its productivity and drainage capability.
Challenges in ERD are hole cleaning, managing the mechanical loads on the drill string and downhole pressure, and cost.Kaiser, Mark J (2007-09-13) Indices Describe Complexity of Drilling Directional, Extended-Reach Wells Red Orbit, retrieved October 6, 2008
Definition Early ERD-well definitions related wells to those that exceeded some step-out/vertical-depth ratio (often 2:1). However, for most highly deviated wells in deepwater environments, this definition clearly does not fit. Some methods have evolved to categorize wells according to their stepout within different vertical-depth ranges. ERD wells then can be described conveniently as shallow, intermediate, deep, and ultradeep. Other variants are associated with operating in deep water and high-pressure/high-temperature environments. Currently, there is no generally accepted ERD-well definition.
What exactly determines a well to be "extended reach" varies over time and location with the development of technologies and of experiences.Negrao, Alvaro (May 2009) Multilateral or Extended Reach SPE Website, retrieved October 6, 2008, link updated May 1, 2013 On 24 April 2015 the world's longest borehole was drilled and completed from the Orlan Platform in the Chayvo Field, Sakhalin-1 Project with a total measured depth of 13,500 m (44,294 ft) and a horizontal displacement of 12,030 m (39,469 ft)Sakhalin-1 sets new extended reach drilling record, Rosneft says, 2015 The previous world record was drilled and completed 30 March 2014 by the Yastreb land drilling rig in the Chayvo Field, Sakhalin-1 Project to a total measured depth of 13,000 m (42,653 ft) and a horizontal displacement of 12,130 m (39,797 ft)
New developments New technologies have emerged that claim to be pushing the existing boundaries of ERD. One of these is the
See also Underbalanced drilling Well drilling Drilling fluid Lost circulation
References