Patent ID: 9561529
Date: 2017-02-07
CPC Classifications: B08B,B24C,C23G,E21B

Claim:
1. A method of washing oilfield tools contaminated with scale, asphaltenes or a combination thereof, wherein the method does not result in a release of volatile organic compounds, released by kerosene or mineral spirits, into air, the method comprising a. obtaining a used oilfield tool with scale, asphaltenes or a combination thereof; b. dipping the oilfield tool into a cryogenic solution, wherein the scale, asphaltenes or a combination thereof are removed by thermal shock that weakens the scale, asphaltenes or a combination thereof by dropping a temperature of the scale, asphaltenes or a combination thereof; c. removing the oilfield tool from the cryogenic solution; d. hardening the oilfield tool to prevent growth of any cracks on an external surface of the oilfield tool; e. subjecting the oilfield tool to non-visual inspection.