US2021102107A1PendingUtilityA1

Inducibly degradable polyacetal compositions for use in subterranean formations

63
Assignee: SHELL OIL COPriority: May 12, 2015Filed: Dec 15, 2020Published: Apr 8, 2021
Est. expiryMay 12, 2035(~8.8 yrs left)· nominal 20-yr term from priority
Inventors:Robert Lawrence BlackbournPaul Richard WeiderJonathan J. BregeAllen D. GabryschRyan Van Zanten
C09K 8/62C09K 8/035C09K 8/50
63
PatentIndex Score
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Claims

Abstract

A degradable plug for use in a wellbore, wherein the degradable plug involves an inducibly degradable composition containing solid polyacetal. After placing the degradable plug in a wellbore, it can be degraded by allowing a portion of the polyacetal present in the inducibly degradable composition to react with an inducer.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A degradable plug for use in a wellbore, wherein the degradable plug comprises an inducibly degradable composition comprising solid polyacetal. 
     
     
         2 . The degradable plug of  claim 1 , wherein the polyacetal has a crystallinity in the range of from 75% to 85%. 
     
     
         3 . The degradable plug of  claim 1 , wherein the polyacetal is a co-polymer of trioxane and ethylene oxide. 
     
     
         4 . The degradable plug of  claim 1 , wherein the polyacetal is present in the inducibly degradable composition as a coating on a surface of the plug. 
     
     
         5 . The degradable plug of  claim 1 , wherein the inducibly degradable composition further comprises sulfur dioxide. 
     
     
         6 . The degradable plug of  claim 1 , wherein the inducibly degradable composition further comprises a sulfur dioxide precursor. 
     
     
         7 . The degradable plug of  claim 1 , wherein the wellbore comprises an inducer capable of reacting with the inducibly degradable composition. 
     
     
         8 . The degradable plug of  claim 7 , wherein the inducer comprises a strong acid. 
     
     
         9 . The degradable plug of  claim 1 , wherein the plug is coated with a sulfur dioxide precursor. 
     
     
         10 . A method comprising: placing a degradable plug in a wellbore, the degradable plug comprising an inducibly degradable composition comprising solid polyacetal. 
     
     
         11 . The method of  claim 10 , further comprising: degrading the inducibly degradable composition. 
     
     
         12 . The method of  claim 11 , wherein degrading the inducibly degradable composition comprises allowing a portion of the polyacetal present in the inducibly degradable composition to react with an inducer. 
     
     
         13 . The method of  claim 12 , wherein producing an alpha hydroxy sulfonic acid. 
     
     
         14 . The method of  claim 11 , wherein degrading the inducibly degradable composition comprises allowing a portion of the polyacetal present in the inducibly degradable composition to react with an inducer by an autocatalytic reaction. 
     
     
         15 . The method of  claim 14 , wherein producing an alpha hydroxy sulfonic acid. 
     
     
         16 . The method of  claim 11 , wherein the inducer comprises sulfur dioxide. 
     
     
         17 . The method of  claim 11 , wherein the inducer comprises a sulfur dioxide precursor. 
     
     
         18 . The method of  claim 11 , wherein allowing a portion of the polyacetal present in the inducibly degradable composition to react with a strong acid. 
     
     
         19 . The method of  claim 18 , wherein the portion of polyacetal present in the inducibly degradable composition degrades to produce formaldehyde. 
     
     
         20 . The method of  claim 10 , wherein the plug is coated with a sulfur dioxide precursor.

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