1. A Novel High-Pressure, Low Temperature Perforation Diverter
- Author
-
R. C. Navarrete, M. Asadi, and S. M. Fleenor
- Subjects
High pressure ,Divertor ,Perforation (oil well) ,Environmental science ,Composite material - Abstract
A novel high-pressure perforation diverter was developed, which is capable of holding pressure differentials of at least 3,750 psi. This diverter was tested in a laboratory model geometry intended to simulate a typical perforation tunnel in an unconventional oil and gas well. This geometry was placed at the bottom of a high-pressure fluid loss cell. Testing was performed at temperatures between 70°F and 180°F at constant pressure. The pressure was incrementally increased from 1,000 psi to 3,750 psi and allowed to equilibrate at each step. The flow rate was monitored through the perforation tunnel as a function of time. There was variation in the flow rate as the pressure was incrementally increased, resulting from the adjustments in the mechanical structure that the diverter forms in the perforation tunnel as a result of the applied pressure. The terminal flow rate was negligible at approximately 3,750 psi. To simulate the removal of the diverter formulation from the perforation tunnel, the perforation tunnel geometry was inverted and constant low flow rates were applied until the diverter was removed. The pressure differential was recorded during this process. The removal data showed that low pressure differentials were required to remove the diverter from the perforation tunnel (25 psi to 200 psi) depending on the shut-in time and the temperature. The salinity of the water affected the performance of the diverter and can be used to fine tune the degree of seal to the perforation. Salinity also helps disaggregate the diverter, facilitating its removal from the well.
- Published
- 2018