Drill stem testing system
US4898236A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1987 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | Mar 5, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/084
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill stem testing system which does not require rotation or axial displacement of an associated drill string to actuate valves and pumps is described. The system includes a drill stem constructed in a number of sections which are interconnected with screw-type connections. The housing contains test-related devices such as a pump for inflating packers with wellbore fluids to isolate a test region, a packer deflation valve for exhausting fluids from the packers when testing is complete, a test flow valve for introducing wellbore test flows into the housing, and a pressure equalization valve for placing the test region in communication with external wellbore regions prior to packer deflation. Each of these devices is adapted for electric actuation and contacts an internal power line extending centrally through the interior of the housing. The power line is construced in line segments which mate with one another when their associated drill stem housing sections are joined to provide a continuous power flow path. An external power line is extended from the surface through a supporting drill string to engage the internal power line. Power switching devices permit an operator to apply …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.