System and method for monitoring and controlling nitrogen pumping at an oil or gas well
US5381667A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1993 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Jun 25, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF17C2250/072
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method and system provide automated, preferably electronic, monitoring and control of equipment used to pump and vaporize liquid nitrogen at an oil or gas well. The method comprises: pumping liquid nitrogen at the well; vaporizing pumped liquid nitrogen at the well; flowing vaporized nitrogen at the well; sensing temperature of the flowing vaporized nitrogen; sensing pressure of the flowing vaporized nitrogen; and automatically stopping the pumping of liquid nitrogen at the well when the sensed temperature is outside a predetermined temperature range or when the sensed pressure is outside a predetermined pressure range. A pre-stoppage warning can also be provided, and data about the vaporized nitrogen can be generated, displayed locally and transmitted remotely. A related system is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.