High Temperature Blocking Gels For Temporary Workover Operations

Blocking gels have been used in low temperature zones for many years. Blocking gels are employed in workover operations to isolate producing zones. The problems with isolating high temperature zones were mostly due to the insufficient or unstable rheological properties of the crosslinked blocking gels. Recent developments of unique crosslinkers, stabilizers, derivative polymers and enzymes have provided significant contributions to the oil and gas industry. The combination of these advantages has led to the development of high temperature blocking gels, which enable temporary isolation of producing zones for extended periods of time at temperatures greater than 250_F. In addition, these blocking gels can be removed at any time without leaving damaging polymeric residue. Laboratory data demonstrates the effectiveness of the blocking gels as well as their ability to clean up in high temperature zones. High Temperature Blocking Gels For Temporary Workover Operations