CN203050598U - 一种套管头的悬挂体带压密封组合结构 - Google Patents
一种套管头的悬挂体带压密封组合结构 Download PDFInfo
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Abstract
一种套管头的悬挂体带压密封组合结构，包括底法兰壳体和悬挂体，其中底法兰壳体上设有环空丝堵、防动顶丝、钢圈槽，悬挂体与底法兰壳体接触的斜坡面上设置有软金属密封圈，在底法兰壳体与悬挂体接触的内腔内或者在悬挂体与底法兰壳体接触面的上竖直面上设置BT密封圈，相对应，在底法兰壳体的两侧或者在悬挂体顶部设置与BT密封圈相通的注入孔，且注入孔的孔口处设置单向阀结构，主要解决软金属密封圈失效情况下，因存在来自地层的高压而不能重新密封环状空间的问题。
Description
技术领域
本实用新型涉及石油油井的井口装置，具体地说是一种下端接油井的地下套管，钻井时上接防喷器，完成后上接采油树的一种套管头的悬挂体带压密封组合结构。
背景技术
石油勘探开发的现场固井作业中，必须使用套管头，套管头的作用是下部连接油井的外层套管及内层套管，并使两套管之间的环形空间得到密封。
现有技术中的套管头分为卡瓦式套管头和悬挂式套管头，其中卡瓦式套管头的卡牙不可避免的会损伤内层套管，且安装时需要拆卸防喷器，使用专用辅助工具投放卡牙，工作量大、操作困难。悬挂式套管头由法兰壳体和悬挂体组成，悬挂体内有台阶，固井时内层套管上部的套管接箍台阶坐在悬挂体内部台阶上，不会损坏内部套管，且安装速度有所改善。
目前，在石油钻井行业中套管头与悬挂体之间的密封主要有两种：一种是软金属和普通O型圈组合，其存在问题是软金属一旦失效普通O型圈难以对密封套管头的高压压力进行有效的密封。另一种是胶垫压紧密封，其结构为用螺栓压紧厚胶板来实现密封，不足是必须拆卸防喷器才能作业，且单纯使用胶板并不能在高温、高压下实现有效的密封。由于石油钻井内部的压力来自地层，一旦泄漏对于上述两种密封形式来说无法实现带压堵漏。
实用新型内容
为了克服上述现有技术存在的缺点，本实用新型的目的在于提供一种套管头的悬挂体带压密封组合结构,能够实现带压密封。
本实用新型解决其技术问题所采取的技术方案是：一种套管头的悬挂体带压密封组合结构，包括底法兰壳体和悬挂体，其中底法兰壳体上设有环空丝堵、防动顶丝、钢圈槽，悬挂体与底法兰壳体接触的斜坡面上设置有软金属密封圈，在底法兰壳体与悬挂体接触的内腔内设置BT密封圈，在底法兰壳体的两侧设置与BT密封圈相通的注入孔，且注入孔的孔口处设置单向阀结构。
作为另一种方案：也可以将BT密封圈设置在悬挂体与底法兰壳体接触面的上竖直面上，而将与BT密封圈相通的注入孔设置在悬挂体顶部。
上述两种方案的进一步的改进方案：所述软金属密封圈设置在所述悬挂体与底法兰壳体接触的斜坡面的顶部，从而避免下钻是钻头及钻具碰挂软金属密封圈，提高了密封的可靠性。
本实用新型的有益效果是：以软金属密封圈作为主密封，其一旦失效出现泄漏，则从注入孔注入粉末状特氟龙，来激发BT密封圈快速填充悬挂体与底法兰壳体之间的间隙，以重新密封环状空间，在注入口的孔口处设置单向阀结构，不必拆卸套管头上部的防喷器部分，便可在带压情况下完成作业。
附图说明
图1为本实用新型实施例一的结构示意图；
图2为本实用新型实施例二的局部结构示意图；
图中：1底法兰壳体；2悬挂体；3软金属密封圈；4注入孔；5BT密封圈；6钢圈槽；7防动顶丝；8单向阀；9环空丝堵。
具体实施方式
实施例一：如图1所示，一种套管头的悬挂体带压密封组合形式，包括底法兰壳体1和悬挂体2，其中底法兰壳体上设有环空丝堵9、防动顶丝7、钢圈槽6，其中一个环空丝堵9连接平板阀，用于向环空注入液体及释放压力，另一个环空丝堵9连接压力表总成，用于观察环空压力；钢圈槽6中放入一只钢圈，用于底法兰壳体1与防喷器组合下法兰之间的密封；防动顶丝7用于固定悬挂体，防止其轴向移动及周向转动。
在底法兰壳体1与悬挂体2接触的内腔内设置BT密封圈5，用于密封底法兰壳体1与悬挂体2之间的环状空间，防止环空压力外泄；在悬挂体2与底法兰壳体1接触的斜坡面上设置有软金属密封圈3，它与BT密封圈5联合组成双重密封，在底法兰壳体1的两侧设置与BT密封圈5相通的注入孔4，用于向BT密封圈5注入粉末状特氟龙，且注入孔的孔口4处设置单向阀8结构。
实施例二：如图2所示，该实施例与实施例一的不同之处仅在于：将BT密封圈5设置在悬挂体2与底法兰壳体1接触面的上竖直面上，在悬挂体2顶部设置与BT密封圈5相通的注入孔4，消除用橡胶制成的BT密封圈5在钻井过程中因受钻井液的冲刷、腐蚀，而过早损坏使密封失效的缺陷。所述注入孔4的孔口处设置单向阀8。该实施例中的注入孔4、单向阀8之间的位置关系、结构关系等均与实施例一相同，所以虽然在图2中没有详细画出，本领域普通技术人员可直接参照图1毫无疑义的直接得出。
该实施例的其余技术同实施例一，不再赘述。除说明书所述的技术特征外，均为本专业技术人员的已知技术。
Claims (3)
1.一种套管头的悬挂体带压密封组合结构，包括底法兰壳体（1）和悬挂体（2），其中底法兰壳体上设有环空丝堵（9）、防动顶丝（7）、钢圈槽（6），所述悬挂体（2）与所述底法兰壳体（1）接触的斜坡面上设置有软金属密封圈（3），其特征是，在所述底法兰壳体（1）与所述悬挂体（2）接触的内腔内设置BT密封圈（5），在所述底法兰壳体（1）的两侧设置与所述BT密封圈（5）相通的注入孔（4），且所述注入孔（4）的孔口处设置单向阀（8）。
2.一种套管头的悬挂体带压密封组合结构，包括底法兰壳体（1）和悬挂体（2），其中底法兰壳体上设有环空丝堵（9）、防动顶丝（7）、钢圈槽（6），所述悬挂体（2）与所述底法兰壳体（1）接触的斜坡面上设置有软金属密封圈（3），其特征是，在所述悬挂体（2）与所述底法兰壳体（1）接触面的上竖直面上设置BT密封圈（5），在所述悬挂体（2）顶部设置与所述BT密封圈（5）相通的注入孔（4），所述注入孔（4）的孔口处设置单向阀（8）。
3.根据权利要求1或2所述的一种套管头的悬挂体带压密封组合结构，其特征是，所述软金属密封圈（3）设置在所述悬挂体（2）与所述底法兰壳体（1）接触的斜坡面的顶部。
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Address after: 253034 Jinghua South Road, Dezhou Economic Development Zone, Shandong Province Patentee after: DEZHOU UNITED PETROLEUM TECHNOLOGY Corp. Address before: 253000 Shandong Province, Dezhou City Economic Development Zone South Road crystal Patentee before: DEZHOU UNITED PETROLEUM MACHINERY Co.,Ltd. |
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