Abstract
This project, which at first was intended to evaluate (through measurements on a scaled model) two existing methods for calculating lateral load on centralizer and casing standoff in a 90 build section of a horizontal well, developed a different
method for calculating the two quantities. The project developed a scaled model of a casing-centralizers-wellbore system. Lateral loads on centralizers were measured with subminiature load cells, while tubing standoff was determined with a spark plug gauge. The model proved to be of substantial help in improving the understanding of this type of bending phenomenon, and this understanding generated a new method of calculating lateral load and standoff. Lateral load and standoff values around one end of the build section where found to depend upon the position of centralizers situated at the other end of the build. Since previous methods neglected this major dependence, the project sought a method which would analyze the entire system as a whole. Analyzing the entire system at the same time, the newly developed method ( a FORTRAN program included in Appendix C and explained in Chapter VII) provides simultaneous lateral load results for all centralizers and casing standoff for all the intervals within the build section. The study includes results, analysis of results and a comparison between measured results and results calculated according to all known methods.
Stefu, Nicolae Mihai (1994). Bending of casing in the build section of a horizontal well. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1994 -THESIS -S817.