{"id":14860,"date":"2019-09-24T09:38:43","date_gmt":"2019-09-24T09:38:43","guid":{"rendered":"https:\/\/merlinerd.com\/dont-forget-what-youve-forgotten-copy\/"},"modified":"2023-06-14T11:05:48","modified_gmt":"2023-06-14T11:05:48","slug":"casing-centralization","status":"publish","type":"post","link":"https:\/\/merlinerd.com\/es\/2019\/09\/24\/casing-centralization\/","title":{"rendered":"Casing centralization (how many, what type, shoe-track configuration?)"},"content":{"rendered":"

Casing centralization and Casing Shoe Track<\/strong><\/h2>\n

Casing centralisers are available in a bewildering variety of types and materials, each claiming to offer their own unique advantages. To be successful, it’s necessary to consider the casing running operation as a whole, with centralisation being only one of many considerations.<\/p>\n

Designing a centraliser programme for a high angle well inevitably involves a compromise between the requirement to get the casing to bottom first time, while ensuring zonal isolation can be achieved. As a starting guide, it’s worth addressing the points below:<\/p>\n

\u2022 What does the casing T&D road-map reveal? For example, is the run likely to be compromised at higher open hole friction factors, is rotation of the casing planned or even possible?<\/p>\n

\u2022 Solid body centralisers are preferred over bow-springs for their increased robustness, particularly where rotation is anticipated.<\/p>\n

\u2022 Is the use of centralisers made using low friction materials to reduce drag (may help inside previous casing, but not generally effective in open hole) and\/or improve ability to rotate justified?<\/p>\n

\u2022 If it’s necessary to run bow-springs (e.g. under-reamed hole), it’s important to include the centraliser run force in the drag modelling. The cumulative effect of this where large numbers of centralisers are being run can be significant. Note that even though the centralizers may have zero run force in the under-reamed hole, there may be a run force prior to exiting the previous casing, which must be accounted for during modelling. If these must be used, solid body designs are recommended over latch-and-lock.<\/p>\n

\u2022 In general, centralizers run in open hole do not reduce drag on high angle wells (more likely to increase it), and it is preferred to minimise the number of centralisers to that required to achieve the necessary zonal isolation and mitigate known differential sticking risk.<\/p>\n

\u2022 Avoid excessive shoe-track centralisation.<\/p>\n

This may increase the effective stiffness of the casing shoe track<\/strong> and result in higher drag, particularly through the build section due to the \u201csnow-plough\u201d effect. The following is a good starting point for design discussion:<\/p>\n

o 1st joint \u2013 one centraliser held in place with a stop collar \u00b12m above the shoe
\no 2nd joint \u2013 no centralisation
\no 3rd joint \u2013 one centraliser (free floating on joint)<\/p>\n

\"\"<\/p>","protected":false},"excerpt":{"rendered":"

Casing centralization and Casing Shoe Track Casing centralisers are available in a bewildering variety of types and materials, each claiming to offer their own unique advantages. To be successful, it’s<\/p>","protected":false},"author":2,"featured_media":19564,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-14860","post","type-post","status-publish","format-standard","has-post-thumbnail","category-technical-article"],"_links":{"self":[{"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/posts\/14860","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/comments?post=14860"}],"version-history":[{"count":4,"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/posts\/14860\/revisions"}],"predecessor-version":[{"id":23177,"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/posts\/14860\/revisions\/23177"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/media\/19564"}],"wp:attachment":[{"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/media?parent=14860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/categories?post=14860"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/merlinerd.com\/es\/wp-json\/wp\/v2\/tags?post=14860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}