CN1317622A - 螺旋起钻扩眼器 - Google Patents

螺旋起钻扩眼器 Download PDF

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Publication number
CN1317622A
CN1317622A CN 00106637 CN00106637A CN1317622A CN 1317622 A CN1317622 A CN 1317622A CN 00106637 CN00106637 CN 00106637 CN 00106637 A CN00106637 A CN 00106637A CN 1317622 A CN1317622 A CN 1317622A
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spiral
drill bit
counterborer
raising
cutting teeth
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CN 00106637
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English (en)
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李子丰
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Individual
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Individual
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Priority to CN 00106637 priority Critical patent/CN1317622A/zh
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Abstract

螺旋起钻扩眼器应用于石油与天然气钻井。螺旋起钻扩眼器用在井眼发生缩径后,利用力在螺旋面上的分解,把轴向运动和轴向拉力转变成旋转运动和扭矩,带动切削齿破碎岩石,把井眼重新扩大为设计井眼大小,从而解除缩径卡钻,顺利起出钻具。螺旋起钻扩眼器(图1)由内筒、外筒、螺纹、弹簧、切削齿、轴承、限位环、溢流孔和导流槽等组成。

Description

螺旋起钻扩眼器
螺旋起钻扩眼器应用于石油与天然气钻井。
一.螺旋起钻扩眼器的用途和特点
在钻井过程中,常常因井眼缩径而发生卡钻。一旦发生缩径,一般都采用大负荷提拉的手段试图凭运气把钻柱起出来,但多数是越提越紧,最后卡死。只有通过套铣才能把钻柱起出来。每处理一次事故,少则花费几十万元,多则花费几百甚至上千万元。
螺旋起钻扩眼器用在发生缩径后,利用力在螺旋面上的分解,把轴向运动和轴向拉力转变成旋转运动和扭矩,带动切削齿破碎岩石,把井眼重新扩大为设计井眼大小,从而解除缩径卡钻,顺利起出钻具。该方法经济、方便、风险小。
二.螺旋起钻扩眼器的结构和使用方法
螺旋起钻扩眼器的结构如图1所示。在钻柱中,它作为一个短节,上端连接钻杆或加重钻杆,下端连接钻铤。它由内筒、外筒、螺纹、弹簧、切削齿、轴承、限位环、溢流孔和导流槽等组成。
图1标记含义:1-丝扣,2-限位环,3-切削齿,4-外筒,5-轴承,6-弹簧,7-螺纹,8-导流槽,9-溢流孔,10-流道,11-内筒,12-丝扣。
在正常钻进时,外筒处于图1所示状态。当起钻遇到缩径时,切削齿压入岩石。同时,轴向压力在螺纹面上进行分解,把轴向运动和轴向拉力转变成旋转运动和扭矩,带动切削齿破碎岩石。当外筒旋转到下死点时,一个切削过程结束。此时,下放钻具一段距离,使得外筒在弹簧力的作用下回到上死点位置。再进行提拉,进入下一个破岩过程。
往复上提、下放钻具,逐渐扩眼,就会把钻具起出来。
螺纹螺旋面的升角必须大于摩擦角。
螺旋起钻扩眼器的外经与稳定器外径一致。外表面可进行抗磨损处理。

Claims (1)

  1. 螺旋起钻扩眼器应用于石油与天然气钻井。利用力在螺旋面上的分解,把轴向运动和轴向拉力转变成旋转运动和扭矩,带动切削齿破碎岩石,把井眼重新扩大为设计井眼大小,从而解除缩径卡钻,顺利起出钻具。
CN 00106637 2000-04-10 2000-04-10 螺旋起钻扩眼器 Pending CN1317622A (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 00106637 CN1317622A (zh) 2000-04-10 2000-04-10 螺旋起钻扩眼器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 00106637 CN1317622A (zh) 2000-04-10 2000-04-10 螺旋起钻扩眼器

Publications (1)

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CN1317622A true CN1317622A (zh) 2001-10-17

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CN 00106637 Pending CN1317622A (zh) 2000-04-10 2000-04-10 螺旋起钻扩眼器

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CN (1) CN1317622A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110608000A (zh) * 2019-11-11 2019-12-24 陕西固德石油工程有限公司 一种冲击旋转划眼式扶正短节装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110608000A (zh) * 2019-11-11 2019-12-24 陕西固德石油工程有限公司 一种冲击旋转划眼式扶正短节装置

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