Inventors list |
Assignees list |
Classification tree browser |
Top 100 Inventors |
Top 100 Assignees |
Dennistoun
Stuart M. Dennistoun, Cypress, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20090294135 | Retrievable Surface Controlled Subsurface Safety Valve - A safety valve apparatus has a housing with a bore and a projection disposed in the bore. A locking dog disposed on the housing is movable to engage an inner conduit wall surrounding the housing, and a flapper rotatably disposed on the housing is movable between opened and closed positions. A first sleeve disposed within the bore above the projection is mechanically movable between locked positions. In one locked position, the sleeve moves the locking dog to engage the wall. A piston disposed in the housing hydraulically communicates with a port in the projection and couples to a second sleeve disposed within the bore below the projection. The second sleeve conceals the piston and is hydraulically movable to open and close the flapper. | 12-03-2009 |
Stuart M. Dennistoun, Carrollton, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20090114389 | Communication Tool for Accessing a Non Annular Hydraulic Chamber of a Subsurface Safety Valve - A communication tool ( | 05-07-2009 |
Stuart Morton Dennistoun, Cypress, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20090050333 | Dual Control Line System and Method for Operating Surface Controlled Sub-Surface Safety Valve in a Well - A control system for a surface controlled sub-surface safety valve has first and second control lines. The first control line communicates control fluid to the sub-surface safety valve and preferably has a sump and in-line filters. Hydraulic pressure applied to the safety valve with this first control line can open the safety valve. The second control line also communicates control fluid to the sub-surface safety valve and preferably has a sump. A connecting valve is connected between the first and second control lines. The connecting valve allows control fluid to communicate from the first control line to the safety valve but prevents fluid communication from the second control line to the first control line. To open the valve, the second control line is exhausted to a reservoir. The dual control lines provide redundant control of the safety valve and can also be cycled to remove debris from the system. | 02-26-2009 |