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<p class="MsoNormal" align="center" style="text-align:center;tab-stops:.25in"><span style="font-size:18.0pt;mso-bidi-font-size:11.0pt;line-height:107%;text-transform:
uppercase">strength degradation OF Non- UNIFORM CASING WITH WEAR under BURST,
COLLAPSE and bending CONDITIONS <o:p></o:p></span></p>
<p class="MsoHeader" align="center" style="text-align:center"><b><span style="font-size:11.0pt"> </span></b></p>
<p class="MsoHeader" align="center" style="text-align:center"><b><span style="font-size:11.0pt">Dileep Kumar Ujjineni Dissertation<o:p></o:p></span></b></p>
<p class="MsoHeader" align="center" style="text-align:center"><b><span style="font-size:11.0pt"> </span></b></p>
<p class="MsoHeader" align="center" style="text-align:center"><b><span style="font-size:11.0pt"> </span></b></p>
<p class="MsoHeader" align="center" style="text-align:center"><b><span style="font-size:11.0pt">Defense Date:</span></b><span style="font-size:11.0pt"> Wednesday, November 30<sup>th</sup> 2016 <b>Time: </b>1:30 pm <b>Location Room: </b></span><span style="font-size:11.0pt;mso-ascii-font-family:
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman"">ERP
9, 124</span><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoHeader" align="center" style="text-align:center"><b><span style="font-size:11.0pt">Committee Members:</span></b><span style="font-size:11.0pt"> Dr. Robello Samuel, Dr. </span><span style="font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:
Calibri;mso-bidi-font-family:"Times New Roman"">Mohamed Soliman, </span><span style="font-size:11.0pt">Dr. </span><span style="font-size:11.0pt;mso-ascii-font-family:
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:"Times New Roman"">Cumaraswamy
Vipulanandan</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoHeader" align="center" style="text-align:center"><span style="font-size:11.0pt"> </span></p>
<p class="MsoHeader" align="center" style="text-align:center"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal" style="text-align:justify;text-indent:.25in"> Casing
wear during drilling and workovers is a major concern in deep or extended reach
wells. Wear by drill string results in thinner portion of casing wall which
causes reduction of casing strength. Wall thinning could also be caused by
bending of casing at steep trajectories. It is important not only to estimate
the casing wear but also to reassess the strength of the residual casing due to
combined effect non uniform thickness due to bending and wear. The API
equations describing casing burst and collapse capacities do not address casing
response with geometrical defects such as wear, wall thinning and combined
loads. A common methodology is to estimate the reduction of strength from API
burst and collapse equations with a linear reduction by remaining wall
thickness or wear percentage equivalent to a “uniformly – worn” casing model to
reassess casing strength for worn casing. However, this strength estimation is
a very conservative method. So, it is required to predict the safe working
pressures for casing for the mentioned scenarios. This study presents new
analytical models to calculate the degraded burst, collapse and bending
strengths for a non- uniform casing with “crescent-shape” casing wear. <o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify;text-indent:.25in">These models
can be used together to calculate the overall stress profile of a casing with
wear, corrosion or cracks to get an estimate of the degradation of the
strength. A parametric study of the casing wear percentage, wear radius, and
non-uniformity has been performed. The
analytical models have been validated by a numerical simulator ANSYS which uses
finite element technique.<o:p></o:p></p>
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