US2008023199A1PendingUtilityA1

Cement Compositions Comprising Environmentally Compatible Defoaming Agents and Methods of Use

52
Individually held — no corporate assignee on recordPriority: Jun 3, 2005Filed: Sep 24, 2007Published: Jan 31, 2008
Est. expiryJun 3, 2025(expired)· nominal 20-yr term from priority
Inventors:Michael J. SzymaskiJ. Michael WilsonSamuel J. LewisBryan K. Waugh
C04B 24/003C09K 8/467C04B 24/08C04B 2103/50
52
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Claims

Abstract

Provided herein are defoaming agents that comprise lecithin and a solvent. Optionally, they may comprise hydrophobic particles. One embodiment provides a method comprising: providing a well fluid that comprises foam; providing a defoaming agent that comprises lecithin and a solvent; and contacting the well fluid with the defoaming agent so that the amount of foam present in the well fluid is reduced.

Claims

exact text as granted — not AI-modified
1 . A method comprising: 
 introducing an agent comprising lecithin and a solvent into a well bore penetrating a subterranean formation.    
     
     
         2 . The method of  claim 1  wherein the solvent is selected from the group consisting of: a C 1  to C 4  alcohol; a glycol; and a base oil.  
     
     
         3 . The method of  claim 1  wherein the solvent is an alkanol.  
     
     
         4 . The method of  claim 1  wherein the solvent comprises a solvent selected from the group consisting of: a glycol ether; an ester of a fatty acid; a paraffin; an ester oil; a higher internal olefin; a silicon oil; and a surfactant.  
     
     
         5 . The method of  claim 1  wherein the agent has a lecithin to solvent ratio of from about 1:100 to about 100:1.  
     
     
         6 . The method of  claim 1  wherein the agent comprises hydrophobic particles.  
     
     
         7 . The method of  claim 1  wherein the solvent comprises butanol.  
     
     
         8 . The method of  claim 1  wherein the agent comprises water.  
     
     
         9 . The method of  claim 1  wherein the agent is used in a drilling fluid, a stimulation fluid, a completion fluid, or a cement composition.  
     
     
         10 . A method comprising: 
 introducing an agent into a subterranean formation, wherein the fluid comprises lecithin and a solvent that is selected from the group consisting of: a C 1  to C 4  alcohol; a glycol; and a base oil.    
     
     
         11 . The method of  claim 10  wherein the agent comprises hydrophobic particles.  
     
     
         12 . The method of  claim 10  wherein the subterranean formation is a hydrocarbon-bearing formation.  
     
     
         13 . The method of  claim 10  further comprising the step of stimulating production of the hydrocarbon bearing formation.  
     
     
         14 . The method of  claim 10  wherein the agent has a lecithin to solvent ratio of from about 1:100 to about 100:1.  
     
     
         15 . The method of  claim 10  further comprising the step of performing cementing operations.  
     
     
         16 . The method of  claim 10  wherein the agent is introduced into the subterranean formation during cleaning operations.  
     
     
         17 . The method of  claim 10  wherein the agent is introduced into the subterranean formation in a manner selected from the group consisting of: injection, mixing, and spraying.  
     
     
         18 . The method of  claim 10  wherein the agent is sprayed directly onto a foamed surface.  
     
     
         19 . A method comprising: 
 introducing into a well bore an agent comprising a solvent and lecithin; wherein the agent reduces foam present in the well bore or in the subterranean formation.    
     
     
         20 . The method of  claim 19  wherein the agent comprises hydrophobic particles.  
     
     
         21 . The method of  claim 19  wherein the solvent is selected from the group consisting of: a C 1  to C 4  alcohol; a glycol; a base oil; a glycol ether; an ester of a fatty acid; a paraffin; an ester oil; a higher internal olefin; a silicon oil; and a surfactant.  
     
     
         22 . The method of  claim 19  wherein the solvent is an alkanol.  
     
     
         23 . The method of  claim 22  wherein the solvent comprises at least one alkanol selected from the group consisting of: methanol, ethanol, propanol, isopropanol, a butanol, monoethylene glycol, and any combination thereof.  
     
     
         24 . The method of  claim 19  wherein the agent has a ratio of lecithin to solvent is from about 1:100 to about 100:1.  
     
     
         25 . The method of  claim 19  wherein the solvent is a butanol.

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