Carbonate formation drilling with PDC drill bits often leads to accelerated catastrophic diamond table loss of the PDC cutter. Historically, PDC toughness related failures have been blamed on the bit/formation interaction producing destructive drilling dysfunctions such as; axial, lateral, and torsional vibrations. A number of design techniques have been applied to cutting structure/bit body design in an attempt to reduce the intensity and frequency of bit/formation interaction related drilling dysfunctions. These techniques were successful in reducing bit/formation interaction instigated drilling dysfunctions, however accelerated catastrophic diamond table failures were still observed at historical rates. This has led to the hypothesis that the accelerated catastrophic diamond table loss observed in carbonate formations is not exclusively related to drilling dysfunctions. The aforementioned hypothesis initiated a detailed study focusing on the relationship between cutting structure design and the damage observed from drilling carbonate formations. The results of this study clearly identified a relationship between hydraulic configuration, the relative magnitude and orientation of individual cutter’s impact force, and observed catastrophic diamond table failure. Several experimental PDC drill bit designs were constructed using different hydraulic and cutting structure design techniques. These techniques were aimed at reducing the hydraulic erosion potential of cutter substrates and normalizing forces across the majority of the cutting structure. The product of these experimental bit runs has been incredibly positive. In every case, the optimized hydraulic configuration and impact force normalized cutting structure design has outperformed the control designs while drilling carbonate intervals. This paper will focus on the performance differences between several control and experimental fixed cutter designs operating in the Anadarko Basin. The salient differences between these designs are the hydraulic configurations and the orientations of individual cutters on the control and experimental cutting structures. The slight modification of hydraulic configuration and individual cutter orientations (from control to experimental) has produced remarkable improvements in efficiency and durability. Several 7 7/8" diameter bit designs will provide the technical basis for this paper.
Особенности дизайна по yменьшению проблем сo cтойкостью pезцов PDC в карбонатных породах Райн Уиден (Ryan W. Weeden) / SPE, National Oilwell Varco; Джастин Уипл (Justin Whipple) / National Oilwell Varco Авторское право 2010, Международная конференция по бурению SPE/IADC Эта статья была представлена на 2010 Международной Конференции по бурению и выставке SPE/IADC в Новом Орлеане, штат Луизиана, США, 2-4 февраля 2010.Эта статья была выбрана комиссией IADC/SPE для презентации после просмотра информации, представленнoй авторами в кратком изложении. Содержание это статьи не было проверено Международной aссоциацeй буровых подрядчиков (IADC) или Oбществом инженеров-нефтяников (SPE) и может подлежать поправкам автора(ов). Материал не отражает точку зрения Международной aссоциации буровых подрядчиков или Общества инженеров-нефтяников, его членов и должностных лиц. Электронное копирование, распространение или хранение любой части этой статьи без письменного разрешения Международной aссоциации буровых подрядчиков или Общества инженеров-нефтяников запрещено. Разрешено воспроизводить в печатном виде выдержку, состоящую из не более, чем 300 слов. Воспроизведение и копирование иллюстраций строго запрещено. Выдержка должна содержать явно выраженное авторское право IADC / SPE.
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