Annulus pressure operated closure valve with improved power mandrel
US4270610A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 15, 1980 |
| Grant date | Jun 2, 1981 |
| Priority date | — |
| Expiry date | Jan 15, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1677
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A testing apparatus for use in an oil well includes an improved power mandrel and power mandrel restraining portion. The power mandrel is disposed in a cylindrical housing having an open bore therethrough and a power port and a circulating port through the walls thereof. The power mandrel includes an annular piston for moving the power mandrel in the first direction in response to fluid pressure exterior of the cylindrical housing communicated to the annular piston through the power port. A plurality of shear pins are disposed in a carrying structure arranged for forced transmitting engagement with a radially extending surface of the power mandrel upon movement of the power mandrel in said first direction. The carrying structure includes inner and outer concentric sleeves through which the shear pins are disposed, with the inner sleeve being arranged for engagement with said radially extending surface of the power mandrel. The shear pins are sheared upon relative longitudinal movement between the inner and outer concentric sleeves. The carrying structure is pressure balanced with relation to pressures in the interior bore of the cylindrical housing. A shock absorber is provided for…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.