CN202531016U - 旋转冲击螺杆钻具 - Google Patents
旋转冲击螺杆钻具 Download PDFInfo
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Abstract
旋转冲击螺杆钻具，属于一种石油钻采
设备
，其包括传动轴总成，传动轴总成包括定子、转子、上下轴承壳、主轴；上下轴承壳与定子连接；主轴与转子连接；主轴位于上下轴承壳内；主轴底端连接钻头；其特征是：上下轴承壳、主轴之间通过一楔块式超越离合器连接，楔块式超越离合器的内圈与主轴连接在一起，外圈与上下轴承壳连接在一起，且上下轴承壳转速大于主轴转速时为其锁止方向。
在某钻压下遇到硬岩层而发生制动时，此楔块式超越
离合器
会将定子、转子啮合为一个整体，利用定子的扭矩将岩层破碎，使之转动。只要钻头继续转过一定角度，切削掉这一硬的岩层，作用在钻头上的钻压就会减小，从而使钻具制动得到缓解，重新正常钻进，提高了工作效率。
Description
技术领域
本实用新型涉及一种石油钻采设备，具体地说是一种螺杆钻具。
背景技术
现在钻井作业中，当螺杆钻具在某钻压下遇到硬岩层而发生制动时，没有很好的办法，只能将钻具提离井底2-3m左右循环正常后继续钻井，有时当制动扭矩很大，时间很长时就会出现泥浆刺穿橡胶造成螺杆钻具失效。
实用新型内容
本实用新型的目的在于提供一种旋转冲击螺杆钻具，该钻具可以有效解决螺杆钻具遇到硬岩层时制动的问题，钻具遇阻时能克服阻力使岩层破裂并能继续切削岩层。
本实用新型解决其技术问题所采用的技术方案是：旋转冲击螺杆钻具，包括传动轴总成，所述的传动轴总成包括定子、转子、上下轴承壳、主轴；上下轴承壳与定子连接；主轴与转子连接；主轴位于上下轴承壳内；所述主轴底端连接钻头；所述上下轴承壳、主轴之间通过一楔块式超越离合器连接，楔块式超越离合器的内圈与所述的主轴连接在一起，楔块式超越离合器的外圈与所述的上下轴承壳连接在一起，且上下轴承壳转速大于主轴转速时为楔块式超越离合器的锁止方向。
本实用新型具有以下突出的有益效果：当钻具在某钻压下遇到硬岩层而发生制动时，也就是钻头转速（主轴转速）低于上下轴承壳转速时，此楔块式超越离合器会将上下轴承壳、主轴啮合为一个整体，利用上下轴承壳的扭矩将岩层破碎，使之转动。只要钻头继续转过一定角度，切削掉这一硬的岩层，作用在钻头上的钻压就会有所减小，从而使钻具制动得到缓解，重新开始正常钻进。这就相当于给钻头一个冲击扭矩，使之遇阻时能克服阻力，类似锤子敲击钻头，产生振动，加速岩层破裂，从而使钻头能继续切削岩层，大大提高了工作效率。
附图说明
下面结合附图和实施例对本实用新型做进一步的说明：
图1是本实用新型实施例的结构示意图；
图2是图1的E向剖面图。
图中：1外圈，2楔块，3内圈，4上下轴承壳，5主轴。
具体实施方式
如图1，图2所示，旋转冲击螺杆钻具，包括传动轴总成，其传动轴总成包括上下轴承壳、主轴、上下轴承壳、主轴；所述上下轴承壳4与定子连接；主轴5与转子连接。主轴5位于上下轴承壳4内。主轴5底端连接钻头。
上下轴承壳4、主轴5之间通过一楔块式超越离合器连接，楔块式超越离合器的内圈3与主轴5连接在一起，楔块式超越离合器的外圈1与上下轴承壳4连接在一起，且上下轴承壳4转速大于主轴5转速时为楔块式超越离合器的锁止方向。
当主轴5转速超过上下轴承壳4转速时，楔块式超越离合器处于开位，钻具正常钻进；当钻具制动，也就是主轴5转速低于上下轴承壳4转速时，楔块式超越离合器闭合，使主轴5和上下轴承壳4抱为整体，即定子、上下轴承壳4带动钻头达到破岩目的，岩层破碎后，钻头所受阻力减小，主轴5转速恢复正常，钻井情况正常。
该楔块式超越离合器的外圈1的扣为反扣，以防止抱合时将扣脱开。
外圈1、楔块2、内圈3接触处都采用特殊的表面处理工艺，增强耐磨性能。
本实用新型的其余技术为现有技术。
Claims (1)
1.旋转冲击螺杆钻具，包括传动轴总成，所述的传动轴总成包括定子、转子、上下轴承壳、主轴；上下轴承壳与定子连接；主轴与转子连接；主轴位于上下轴承壳内；所述主轴底端连接钻头；其特征是：所述上下轴承壳、主轴之间通过一楔块式超越离合器连接，楔块式超越离合器的内圈与所述的主轴连接在一起，楔块式超越离合器的外圈与所述的上下轴承壳连接在一起，且上下轴承壳转速大于主轴转速时为楔块式超越离合器的锁止方向。
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