[vc_row][vc_column width=<\/b>#8221;1\/2<\/b>#8243;][vc_column_text]<\/p>\n
G.M. Efendiyev,<\/em><\/strong><\/p>\n Institute of Oil and Gas of the Ministry of Science and Education of Azerbaijan Republic, Baku, Azerbaijan<\/em><\/p>\n I.A. Piriverdiyev,<\/em><\/strong><\/p>\n Institute of Oil and Gas of the Ministry of Science and Education of Azerbaijan Republic, Baku, Azerbaijan<\/em><\/p>\n \u00a0<\/em><\/strong>M.K. Karazhanova, <\/em><\/strong><\/p>\n Yessenov University, Aktau, Kazakhstan<\/em><\/p>\n M.B. Asgarov<\/em><\/strong><\/p>\n Azerbaijan State Oil and Industry University, Baku, Azerbaijan<\/em><\/p>\n \u00a0<\/em><\/p>\n Abstract<\/em><\/strong>. In order to avoid various drilling problems associated with instability of the wellbore walls, lost circulation, etc., it is necessary to use the concept of a \u201csafety window\u201d of the drilling fluid. Calculation of the boundaries of the mud safety window makes it possible to justify the choice of mud density for safe drilling of wells. However, with all its advantages, it is impossible to accurately determine the boundaries of the \u201csafety window\u201d due to their blurriness, which requires the use of appropriate methods based on fuzzy logic and taking into account this type of heterogeneity. This article proposes an approach based on the application of the basic principles of fuzzy set theory to the choice of drilling mud density using the example of several fields in Azerbaijan, Russia and Kazakhstan. An equation for determining density was obtained, calculations were made using this expression for some fields, and the boundaries of the so-called \u201csafety window\u201d were assessed based on geomechanical studies.<\/p>\n Keywords:<\/em><\/strong> safety window of mud, uncertainty, decision making, optimal density, pressure gradients, objectives and limitations.[\/vc_column_text][\/vc_column][vc_column width=<\/b>#8221;1\/2<\/b>#8243;][vc_btn title=<\/b>#8221;Read PDF<\/b>#8221; color=<\/b>#8221;primary<\/b>#8221; link=<\/b>#8221;url:https%3A%2F%2Fysj.yu.edu.kz%2Fwp-content%2Fuploads%2F2025%2F03%2F%E2%84%9616-48.pdf<\/b>#8221;][vc_column_text]DOI 10.56525\/SPOT2999<\/strong>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":" [vc_row][vc_column width=#8221;1\/2#8243;][vc_column_text] G.M. Efendiyev, Institute of Oil and Gas of the Ministry of Science and Education of Azerbaijan Republic, Baku, Azerbaijan I.A. Piriverdiyev, Institute of Oil and Gas of the Ministry of Science and Education of Azerbaijan Republic, Baku, Azerbaijan \u00a0M.K. Karazhanova, Yessenov University, Aktau, Kazakhstan M.B. Asgarov Azerbaijan State Oil and Industry University, Baku, [<\/b>hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[],"_links":{"self":[{"href":"https:\/\/ysj.yu.edu.kz\/en\/wp-json\/wp\/v2\/posts\/1944"}],"collection":[{"href":"https:\/\/ysj.yu.edu.kz\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ysj.yu.edu.kz\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ysj.yu.edu.kz\/en\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/ysj.yu.edu.kz\/en\/wp-json\/wp\/v2\/comments?post=1944"}],"version-history":[{"count":12,"href":"https:\/\/ysj.yu.edu.kz\/en\/wp-json\/wp\/v2\/posts\/1944\/revisions"}],"predecessor-version":[{"id":2832,"href":"https:\/\/ysj.yu.edu.kz\/en\/wp-json\/wp\/v2\/posts\/1944\/revisions\/2832"}],"wp:attachment":[{"href":"https:\/\/ysj.yu.edu.kz\/en\/wp-json\/wp\/v2\/media?parent=1944"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ysj.yu.edu.kz\/en\/wp-json\/wp\/v2\/categories?post=1944"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ysj.yu.edu.kz\/en\/wp-json\/wp\/v2\/tags?post=1944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}