{"version":"1.0","provider_name":"API\u306e\u92fc\u9244\u6cb9\u7530\u306e\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u3001\u5305\u88c5\u306e\u7ba1\u3001OCTG\u88fd\u9020\u696d\u8005\u304a\u3088\u3073\u88fd\u9020\u8005","provider_url":"https:\/\/www.wldsteel.com\/ja","author_name":"WLDSTEEL","author_url":"https:\/\/www.wldsteel.com\/ja\/author\/admin\/","title":"Classification and use of oil casing - API steel oilfield pipeline, casing pipe, OCTG manufacturer and supplier","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\"><a href=\"https:\/\/www.wldsteel.com\/ja\/classification-and-use-of-oil-casing\/\">Classification and use of oil casing<\/a><\/blockquote>\n<script type='text\/javascript'>\n<!--\/\/--><![CDATA[\/\/><!--\n\t\t\/*! This file is auto-generated *\/\n\t\t!function(d,l){\"use strict\";var e=!1,n=!1;if(l.querySelector)if(d.addEventListener)e=!0;if(d.wp=d.wp||{},!d.wp.receiveEmbedMessage)if(d.wp.receiveEmbedMessage=function(e){var t=e.data;if(t)if(t.secret||t.message||t.value)if(!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var r,i,a,s=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),n=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),o=new RegExp(\"^https?:$\",\"i\"),c=0;c<n.length;c++)n[c].style.display=\"none\";for(c=0;c<s.length;c++)if(r=s[c],e.source===r.contentWindow){if(r.removeAttribute(\"style\"),\"height\"===t.message){if(1e3<(a=parseInt(t.value,10)))a=1e3;else if(~~a<200)a=200;r.height=a}if(\"link\"===t.message)if(i=l.createElement(\"a\"),a=l.createElement(\"a\"),i.href=r.getAttribute(\"src\"),a.href=t.value,o.test(a.protocol))if(a.host===i.host)if(l.activeElement===r)d.top.location.href=t.value}}},e)d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",t,!1),d.addEventListener(\"load\",t,!1);function t(){if(!n){n=!0;for(var e,t,r=-1!==navigator.appVersion.indexOf(\"MSIE 10\"),i=!!navigator.userAgent.match(\/Trident.*rv:11\\.\/),a=l.querySelectorAll(\"iframe.wp-embedded-content\"),s=0;s<a.length;s++){if(!(e=a[s]).getAttribute(\"data-secret\"))t=Math.random().toString(36).substr(2,10),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t);if(r||i)(t=e.cloneNode(!0)).removeAttribute(\"security\"),e.parentNode.replaceChild(t,e)}}}}(window,document);\n\/\/--><!]]>\n<\/script><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.wldsteel.com\/ja\/classification-and-use-of-oil-casing\/embed\/\" width=\"600\" height=\"338\" title=\"&#8220;Classification and use of oil casing&#8221; &#8212; API steel oilfield pipeline, casing pipe, OCTG manufacturer and supplier\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe>","description":"Surface casing1\u3001Used to seal the upper unstable loose, collapse-prone and leaky formations and water layers.2\u3001Installation of wellhead device to control well blowout.3\u3001Support part of the weight of technical casing and oil layer casing. The depth of the surface casing down depends on the specific situation, usually a few dozen meters to a few hundred meters or deeper (30 to 1500m). The cement return height outside the tubing is usually returned to the surface. When drilling high-pressure gas wells, if the upper rock layer is loose and broken, the surface casing needs to be lowered to prevent the high-pressure gas from escaping the surface. If the surface casing needs to be [&hellip;]"}