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Horizontal Wells. Why Can’T Trust the Logging while Drilling Depth and Is It All Bad?
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Horizontal Wells 2019 Challenges and Opportunities, May 2019, Volume 2019, p.1 - 6
Abstract
The theater begins with a hanger, and all measurements in a well begin with depth. Depth answers the simple question “Where?”. The location of pays, fluid contacts, and intervals of workover jobs - depth is responsible for all this. Traditionally, depth measurement tools are wireline cable or drill pipe. The error is different, as well as the mechanisms of its appearance. In vertical wells, measured by cable, as a rule, the problem of depth error is easily solved with a downlog. But in HAHZ wells the cable is used extremely rarely, logging while drilling is used. In this case, the error of depth measurement can reach up to 10-15 m of measured deoth and 3-5 m in vertical depth. Nomber of horizontal wells in Russia is growing every year, and today more than a third of wells drilled in Russia have a horizontal section. Adding to this figure - higly inclined wells, measured on pipes, we will get a significant reason to revise the problem of the depth measured on pipes and learn how to refine it. The purpose of the paper is to assess the factors that distort the depth while drilling and propose ways to refine it.