| Cleansorb supplies a number of breakers for guar-borate and other fracturing fluids which can have their viscosity greatly reduced by a decrease in the pH. These breakers are activated by temperature. They are inactive during the fracturing process but are triggered as the fracturing fluid warms to formation temperature after the fracturing operation has been completed. |
 Before acid treatment |
 After acid treatment |
| CS-EOA-1 is a particulate material that effectively delivers acid at formation temperatures of about 40 to 70° C (104 to 158° F). Other particulate materials that effectively deliver acid at formation temperatures of about 70 ° C (158° F) and above are currently under development.
|
||
| These acid breakers may be combined with a suitable enzyme breaker, normally encapsulated to protect it from inactivation at the high initial pH typical of guar-borate fracturing fluids. Ideally, the enzyme is released after the acid delivering material has lowered the pH to a value at which the enzyme is active. Acid release results in breaking of the cross linking providing a significant reduction in viscosity. Release of the enzyme breaker results in hydrolysis of the polymer backbones leading to an even greater reduction in the viscosity, essentially reducing the fluid viscosity to close to that of water. |
After acid and enzyme treatment |
|
© Cleansorb Limited 2006.
