US2005257932A1PendingUtilityA1

Filter cake degradation compositions and associated methods

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Individually held — no corporate assignee on recordPriority: May 19, 2004Filed: May 19, 2004Published: Nov 24, 2005
Est. expiryMay 19, 2024(expired)· nominal 20-yr term from priority
Inventors:Eric DavidsonAnuszka Laird
C09K 8/52C09K 2208/18C09K 8/68C09K 8/04
40
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Claims

Abstract

The present invention relates to removal of filter cakes in subterranean formations. More particularly, the present invention provides filter cake degradation compositions and methods of degrading filter cakes. The present invention provides methods of degrading a fluid-loss additive component in a portion of a filter cake in a subterranean formation comprising: contacting the fluid-loss additive component with a filter cake degradation composition that comprises a precipitation resistant enzyme, wherein the precipitation resistant enzyme is capable of degrading the fluid-loss additive component; and allowing the filter cake degradation composition to at least partially degrade the fluid-loss additive component in a portion of the filter cake. The present invention also provides filter cake degradation compositions comprising a precipitation resistant enzyme component that will at least partially degrade a portion of a filter cake.

Claims

exact text as granted — not AI-modified
1 . A method of degrading a fluid-loss additive component in a portion of a filter cake in a subterranean formation comprising: 
 contacting the fluid-loss additive component with a filter cake degradation composition that comprises a precipitation resistant enzyme, wherein the precipitation resistant enzyme is capable of degrading the fluid-loss additive component; and    allowing the filter cake degradation composition to at least partially degrade the fluid-loss additive component in a portion of the filter cake.    
   
   
       2 . The method of  claim 1  wherein the precipitation resistant enzyme comprises a hydrolase enzyme.  
   
   
       3 . The method of  claim 1  wherein the precipitation resistant enzyme comprises a glycosidase enzyme.  
   
   
       4 . The method of  claim 1  wherein the precipitation resistant enzyme comprises an α-amylase enzyme.  
   
   
       5 . The method of  claim 1  wherein the precipitation resistant enzyme comprises a β-amylase enzyme.  
   
   
       6 . The method of  claim 1  wherein the precipitation resistant enzyme comprises a glucan 1,4-α-glucosidase enzyme.  
   
   
       7 . The method of  claim 1  wherein the precipitation resistant enzyme is capable of degrading the fluid-loss additive without precipitation in a saturated brine and at a temperature up to at least about 90° C.  
   
   
       8 . The method of  claim 1  wherein the precipitation resistant enzyme is present in the filter cake degradation composition in an amount sufficient to degrade a fluid-loss additive component of the filter cake.  
   
   
       9 . The method of  claim 1  wherein the precipitation resistant enzyme is present in the filter cake degradation composition in an amount in the range of from about 10 KNU to about 150 KNU.  
   
   
       10 . The method of  claim 1  wherein the filter cake degradation composition further comprises glycerol, bactericides, microbiocides, surfactants, chelating agents, foaming agents, or combinations thereof.  
   
   
       11 . The method of  claim 1  wherein the filter cake degradation composition further comprises one or more agents capable of at least partially degrading a bridging agent component of the filter cake.  
   
   
       12 . The method of  claim 11  wherein the agent comprises a complexing agent, organic acid, an acid precursor, or a combination thereof.  
   
   
       13 . The method of  claim 11  wherein the agent comprises ethylenediaminetetraacetic acid, a salt of ethylenediaminetetraacetic acid, diethyelene glycol diformate, glycerol diacetate, glycerol triacetate, or a combination thereof.  
   
   
       14 . The composition of  claim 1  wherein the filter cake degradation composition is provided in a clean-up fluid.  
   
   
       15 . The composition of  claim 1  wherein the filter cake degradation composition is provided in a servicing fluid.  
   
   
       16 . The composition of  claim 15  wherein the servicing fluid is a drilling fluid.  
   
   
       17 . The composition of  claim 15  wherein the servicing fluid is a fracturing fluid or a gravel packing fluid.  
   
   
       18 . The method of  claim 1  wherein the filter cake degradation composition is present in an amount sufficient to at least partially degrade a fluid-loss additive component of the filter cake.  
   
   
       19 . The method of  claim 1  wherein the filter cake degradation composition is present in an amount sufficient to at least partially degrade a bridging agent component of the filter cake.  
   
   
       20 . A filter cake degradation composition comprising a precipitation resistant enzyme component that will at least partially degrade a portion of a filter cake.  
   
   
       21 . The composition of  claim 20  wherein the precipitation resistant enzyme comprises a hydrolase enzyme.  
   
   
       22 . The composition of  claim 20  wherein the precipitation resistant enzyme comprises a glycosidase enzyme.  
   
   
       23 . The composition of  claim 20  wherein the precipitation resistant enzyme comprises an α-amylase enzyme.  
   
   
       24 . The composition of  claim 20  wherein the precipitation resistant enzyme comprises a β-amylase enzyme.  
   
   
       25 . The composition of  claim 20  wherein the precipitation resistant enzyme comprises a glucan 1,4-α-glucosidase enzyme.  
   
   
       26 . The composition of  claim 20  wherein the precipitation resistant enzyme is capable of degrading the fluid-loss additive without precipitation in a saturated brine and at a temperature up to at least about 90° C.  
   
   
       27 . The composition of  claim 20  wherein the precipitation resistant enzyme is present in the filter cake degradation composition in an amount sufficient to degrade a fluid-loss additive component of the filter cake.  
   
   
       28 . The composition of  claim 20  wherein the precipitation resistant enzyme is present in the filter cake degradation composition in an amount in the range of from about 10 KNU to about 150 KNU.  
   
   
       29 . The composition of  claim 20  wherein the filter cake degradation composition further comprises glycerol, bactericides, microbiocides, surfactants, chelating agents, foaming agents, or combinations thereof.  
   
   
       30 . The composition of  claim 20  wherein the filter cake degradation composition further comprises one or more agents capable of at least partially degrading a bridging agent.  
   
   
       31 . The composition of  claim 30  wherein the agent comprises a complexing agent, organic acid, an acid precursor, or a combination thereof.  
   
   
       32 . The composition of  claim 30  wherein the agent comprises ethylenediaminetetraacetic acid, a salt of ethylenediaminetetraacetic acid, diethyelene glycol diformate, glycerol diacetate, glycerol triacetate, or a combination thereof.  
   
   
       33 . The composition of  claim 20  wherein the filter cake degradation composition is provided in a clean-up fluid.  
   
   
       34 . The composition of  claim 20  wherein the filter cake degradation composition is provided in a servicing fluid.  
   
   
       35 . The composition of  claim 34  wherein the servicing fluid is a drilling fluid.  
   
   
       36 . The composition of  claim 34  wherein the servicing fluid is a fracturing fluid or a gravel packing fluid.  
   
   
       37 . The composition of  claim 20  wherein the filter cake degradation composition is present in an amount sufficient to at least partially degrade a fluid-loss additive component of the filter cake.  
   
   
       38 . The method of  claim 20  wherein the filter cake degradation composition is present in an amount sufficient to at least partially degrade a bridging agent component of the filter cake.

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