US2012073814A1PendingUtilityA1

Expansion against cement for zonal isolation

46
Individually held — no corporate assignee on recordPriority: Mar 31, 2009Filed: Mar 31, 2010Published: Mar 29, 2012
Est. expiryMar 31, 2029(~2.7 yrs left)· nominal 20-yr term from priority
Inventors:Devendra R. AlguJames F. Heathman
E21B 43/103E21B 33/14
46
PatentIndex Score
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Claims

Abstract

A method for improving zonal isolation between formations along a borehole, comprises a) providing a pipe in the borehole, wherein at least a portion of the pipe lies between the formations, b) providing a body of cement in the annulus between the borehole wall and said pipe portion, c) allowing the body of cement to cure until it has reached at least 70 Bearden units consistency, and d) expanding said pipe portion so as to decrease the cross-sectional area of the annulus between the borehole wall and said pipe portion.

Claims

exact text as granted — not AI-modified
1 . Method for improving zonal isolation between formations along a borehole, comprising:
 a) providing a pipe in the borehole, wherein at least a portion of the pipe lies between the formations;   b) providing a body of cement in the annulus between the borehole wall and said pipe portion;   c) allowing the body of cement to cure until it has reached at least 70 Bearden units consistency; and   d) expanding said pipe portion so as to decrease the cross-sectional area of the annulus between the borehole wall and said pipe portion.   
     
     
         2 . The method of  claim 1  wherein step d) eliminates fluid channels in the cement body. 
     
     
         3 . The method of  claim 1  wherein step d) increases the density of the cement body. 
     
     
         4 . The method of  claim 1 , further including the step of providing a second cement body in the annulus, wherein the second cement body has a longer cure time than the first cement portion. 
     
     
         5 . The method of  claim 4  wherein the second cement body is not cured when step d) is carried out. 
     
     
         6 . The method of  claim 4  wherein at least one cement body contains polymers. 
     
     
         7 . The method of  claim 6  wherein at least one cement body contains ringing gels. 
     
     
         8 . The method of  claim 4  wherein step c) does not cause the second cement body to fracture. 
     
     
         9 . The method of  claim 1 , further including the step of providing an exit path for water expelled from the cement during expansion.

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