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所在平台: Udemy |
课程主页: https://www.udemy.com/course/casing-of-the-oil-well-part2/
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课程名称：油井套管（H型）第二部分 课程概述： 本课程深入讲解套管在油井中的作用，套管是一种大直径管道，被组装后插入新钻的井段，并通常用水泥固定。 课程内容： 1. **尺寸、材料和连接：** * 外径和壁厚 * 重量 * 长度 * 钢级 * 套管连接 * 确定管体结构 * 套管接箍的外径决定了与套管尺寸最匹配的井眼尺寸 * 壁厚决定了内径和管重 2. **套管用钢级：** * 钢合金成分 * 用于制造套管的原材料没有单一的规定显微组织 * 通过添加特殊钢合金和热处理工艺，可以改善钢的显微组织和力学性能 * 经过复杂的制造程序后，用于套管管材的钢材会根据特定环境和使用级别进行调整 3. **高端连接（专有连接）：** * Hydril * Manesman * VAM * 等 4. **API 连接 - 圆纹螺纹：** * **特点：** * 每英寸8个螺纹 * 螺纹型材为“V”形，牙侧夹角为60° * 锥度接近每英尺3/4英寸 * 牙顶和牙底螺纹为圆弧形 * 泄漏轨迹沿着螺纹 * 不推荐用于气井或高压井 * 接合面短且强度较低 5. **API 连接 - 方纹螺纹（ Buttress Thread ）：** * **其他特点：** * 比圆纹螺纹有更高的泄漏可能性 * 爆破强度低于圆纹螺纹 * 对轴向载荷和弯曲载荷强度较高 * 在连接时容易发生扭缠和卡住 * 在受压情况下表现不佳 * 最佳的螺纹配合位于接头顶端附近
The casing is a large diameter pipe that is assembled and inserted into a recently drilled section of a borehole and typically held into place with cement.Dimensions, Materials, and Connections:•Outside Diameter and Wall Thickness•Weight•Length•Steel Grades•Casing Connections•Determine the pipe body structure•The outside diameter of casing couplings determines the hole size that best fit the casing size•Wall thickness determines inside diameter and pipe weightSteel Grades for Casing•Composition of Steel Alloys•The raw steel material used for casing manufacturing does not have one defined microstructure•Both the steel microstructure and mechanical properties can be improved mainly with the addition of special steel alloys and thermal processes•After a complex manufacturing procedure the steel used for casing tubular is adapted to suit specific environments and service levelsPremium Connections (Proprietary Connections):•Hydril•Manesman•VAMEtc.•API Connection - Round Thread:Characteristics:•Eight (8) threads per inch•Thread profile "V" shaped with 60° between flanks•Taper close to ¾" per foot•Crest and root thread round cut,•Leak trajectory along the threads•Not recommended for gas wells or HP wells•Short and weak engagement surface.•API Connection - Buttress Thread:Other Characteristics•Higher possibility of leaking than the round thread•Lower bursting strength than the round thread•Strong for axial and flexing loads•Prone to strand and stuck while making connections•Does not work well under compression•Best threads are located toward the tip of the pin
