Donald J Robison

US Patent:

20180266220, Sep 20, 2018

Filed:

May 24, 2018

Appl. No.:

15/989103

Inventors:

- Houston TX, US
Donald ROBISON - Houston TX, US

International Classification:

E21B 43/12
F04B 47/12
E21B 34/06
F04B 31/00

Abstract:

Provided is an improved bypass durable dart plunger that descends faster in a hydrocarbon well, is capable of lifting more fluids and has a durable and replaceable clutch assembly. The various components of the durable dart plunger includes a sleeve, a dart body with a one or more flow ports (chokes) cut at right angles through the dart body, a pin and a replaceable clutch assembly (also referred to a retention assembly). The chokes can be of varying sizes. In one embodiment, the clutch assembly includes a plurality of clutch mechanisms wherein each mechanism includes a ball, a socket screw and a resilient spacer.

US Patent:

20170107803, Apr 20, 2017

Filed:

Dec 30, 2016

Appl. No.:

15/396188

Inventors:

- Houston TX, US
Donald ROBISON - Houston TX, US

International Classification:

E21B 43/12
F04B 47/12
E21B 34/06

Abstract:

Provided is an improved bypass durable dart plunger that descends faster in a hydrocarbon well, is capable of lifting more fluids and has a durable and replaceable clutch assembly. The various components of the durable dart plunger includes a sleeve, a dart body with a one or more flow ports (chokes) cut at right angles through the dart body, a pin and a replaceable clutch assembly (also referred to a retention assembly). The chokes can be of varying sizes. In one embodiment, the clutch assembly includes a plurality of clutch mechanisms wherein each mechanism includes a ball, a socket screw and a resilient spacer.