Thermal well liner removal method and apparatus |
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| 申请号 | US3565177D | 申请日 | 1969-04-02 | 公开(公告)号 | US3565177A | 公开(公告)日 | 1971-02-23 |
| 申请人 | CHEVRON RES; | 发明人 | HUTCHISON STANLEY O; | ||||
| 摘要 | The disclosure relates to removing heat expansible well liners from a well by contacting the liner with circulating hot fluid to uniformly increase the temperature of the liner and to assist in freeing the liner from the earth while simultaneously pulling the liner from the well. | ||||||
| 权利要求 | 2. The method of removing a well liner made of a heat expansible material and bonded to a formation in a well comprising the steps of injecting steam down a well to a location adjacent the lower portion of a well liner, circulating said steam up the well in contact with said liner to uniformly increase the temperature of said liner to assist in freeing in from the earth formation adjacent said liner, while simultaneously placing said liner in tension by exerting a lifting force on said liner and removing said liner from the well. 3. The method of claim 2 further characterized in that steam injection is halted after the liner is uniformly heated and a cooler fluid is brought in contact with the liner to thermally shock the liner to assist in freeing the liner from the adjacent earth formation. 4. The method of claim 3 further characterized in that a circulating medium is circulated in the well to clean undesirable material from such well prior to injecting steam into the well. 5. The method of claim 4 further characterized in that foam is the circulated medium. 6. Apparatus for removing well liners from a well comprising a tubing string extending into a well, hoist means connected to said tubing string for lifting and lowering said tubing string, spear means on the lower end of said tubing string for engaging well liner, said spear means having a flow path formed therethrough and in communication with the interior of said tubing string, tubing tail means connected on the lower end of said spear means and extending to the lower end of said liner, steam source means for making steam and means connecting said steam source means with said tubing string for injecting steam down said well. 7. The apparatus of claim 6 further characterized in foam source means for making foam and means connecting said foam source means with said tubing string for injection down said well. |
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