Method and apparatus for dispensing oil well proppant additive
US4681245A · kind A · utility
Inventor
Key dates
| Filing date | Mar 25, 1985 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Mar 25, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/267
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for dispensing an additive (70) into a stream (14) of well proppant includes a sealed housing (42), (44), (52) containing a first chamber (102), a second chamber (104), and an additive dispenser (64), (72) operably connected to a motor (92). The upper chamber (102) is adapted to contain the additive (70), and the lower chamber (104) communicated with the pressurized well proppant stream (14). The additive dispensing means (64), (72) is disposed between the upper chamber (102) and the lower chamber (104). A pressure equalizing tube (98) within said housing (42), (44), (52) extends from the upper chamber (102) through the additive dispenser (64), (72) to the lower chamber (104) to equalize the fluid pressure existing in the lower chamber (104) with the fluid pressure existing in the upper chamber (102) during the dispensing of the additive (70) from the upper chamber (102) to the lower chamber (104). In the preferred embodiment the additive dispenser (64), (72) consists of a screw or auger (72) disposed within an auger ring (64), and the additive (70) flows through the additive dispenser (64), (72) to the lower chamber (104) under the force of gravity. Where the additive…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.