Killing wells is the most frequent operation with the use of chemical reagents. The application of quality killing fluids (KF), inhibited for stabilizing clay, preventing corrosion, emergence of infusible salts and enduring inverted emulsions, allows preserving reservoir characteristics of the formation.

Complexes of killing fluids were developed in Gubkin Russian State University of Oil and Gas. It allows not only preserving the reservoir characteristics of the formation, but also to increase the safety of well workover and remediation jobs and decrease the costs of the killing fluids.

All killing fluids can be divided into two categories:

• solutions with absorption control;
• solutions with productivity control.

Solutions with absorption control allow limiting filtration of salt killing fluids in the formation and keep the well productivity after workover on the same level.

Solutions with productivity control is a standard salt killing fluid containing a certain amount of chemical additives providing for minimal negative impact of the killing fluid on further exploitation of the well. Usually such solutions cost as much as other salt fluids, while they bring down the risks of endangering well productivity and increasing the rate of water in the product.

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