US2017081223A1PendingUtilityA1

Treating seawater for oilfield operations

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Assignee: SAUDI ARABIAN OIL COPriority: Sep 18, 2015Filed: Sep 15, 2016Published: Mar 23, 2017
Est. expirySep 18, 2035(~9.1 yrs left)· nominal 20-yr term from priority
Inventors:Katherine Leigh HullBrent CooperGhaithan A. Al-Muntasheri
C02F 1/5272C02F 5/10C02F 2103/08C02F 2101/101C02F 1/683C02F 2303/22
59
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Claims

Abstract

A method includes mixing seawater with a two-part additive system configured to precipitate sulfate from the seawater; removing the sulfate precipitates from the seawater; and delivering the seawater into an oilfield reservoir.

Claims

exact text as granted — not AI-modified
1 . A method comprising:
 mixing seawater with a two-part additive system configured to precipitate sulfate from the seawater;   removing the sulfate precipitates from the seawater; and   delivering the seawater into an oilfield reservoir.   
     
     
         2 . The method of  claim 1 , wherein the two-part additive system is configured to cause formation of crystalline sulfate precipitates. 
     
     
         3 . The method of  claim 1 , wherein the two-part additive system comprises aminoguanidine hydrochloride. 
     
     
         4 . The method of  claim 1 , wherein the two-part additive system comprises glyoxal. 
     
     
         5 . The method of  claim 1 , wherein the two-part additive system comprises a guanidine compound. 
     
     
         6 . The method of  claim 1 , wherein the two-part additive system comprises a hydrazine compound. 
     
     
         7 . The method of  claim 1 , wherein the two-part additive system comprises an aldehyde molecule. 
     
     
         8 . The method of  claim 1 , wherein the two-part additive system comprises a dialdehyde molecule. 
     
     
         9 . The method of  claim 1 , wherein the two-part additive system comprises.a dicarbonyl molecule. 
     
     
         10 . The method of  claim 1 , wherein the two-part additive system comprises an additive having the following structure: 
       
         
           
           
               
               
           
         
         wherein each R 1  is independently be selected from H or any carbon chain and L is a direct link or any suitable molecular linkage. 
       
     
     
         11 . The method of  claim 1 , wherein a concentration of sulfate in the treated seawater is less than 0.02 M. 
     
     
         12 . The method of  claim 11 , wherein the concentration of sulfate in the treated seawater is lower than a solubility level of sulfate in the treated seawater. 
     
     
         13 . The method of  claim 1 , wherein the seawater does not contain a scale inhibitor. 
     
     
         14 . The method of  claim 1 , wherein removing the sulfate precipitates from the seawater comprises filtering the seawater using a filter having a pore size of at least 0.5 mm. 
     
     
         15 . A treated seawater composition comprising:
 seawater;   aminoguanidine hydrochloride; and   glyoxal.   
     
     
         16 . The treated seawater composition of  claim 15 , wherein the composition comprises precipitated sulfate crystals and less than 0.02 M sulfate ions in the aqueous phase. 
     
     
         17 . The treated seawater composition of  claim 16 , wherein the composition comprises less than 0.01 M sulfate ions. 
     
     
         18 . The treated seawater composition of  claim 17 , wherein the composition comprises less than 0.005 M sulfate ions. 
     
     
         19 . The treated seawater composition of  claim 15 , wherein the composition contains complexes of the aminoguanidine hydrochloride, glyoxal, and chloride ions. 
     
     
         20 . An additive system for treating seawater comprising aminoguanidine hydrochloride and glyoxal. 
     
     
         21 . A composition comprising water and precipitated complexes of sulfate ions, a first additive, and a second additive. 
     
     
         22 . The composition of  claim 21 , wherein the first additive comprises aminoguanidine hydrochloride and the second additive comprises glyoxal. 
     
     
         23 . The composition of  claim 21 , wherein the first additive is selected from a guanidine or a hydrazine compound and the second additive is selected from an aldehyde, a dialdehyde, or a dicarbonyl. 
     
     
         24 . The composition of  claim 21 , wherein the water is seawater. 
     
     
         25 . The composition of  claim 21 , wherein the precipitates have an average length of at least 2 mm. 
     
     
         26 . The composition of  claim 21 , wherein the precipitates are crystalline.

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