Downhole drilling tool system
US5201375A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1990 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Apr 2, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/18
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In one broad aspect, the invention provides a method of receiving instructions for an implement, for example, a drill string stabilizer, mounted on a drill string, which instructions are transmitted by varying the rate of flow of, or pressure exerted by, the fluid in the bore of the drill string in accordance with one of a plurality of predetermined sequences; the method comprising the steps of: PA0 a) monitoring variations in the rate of flow of, or pressure exerted by, the fluid in the drill string; PA0 b) comparing the sequence of monitored variations with a plurality of predetermined sequences, each predetermined sequence corresponding to a set of instructions for the implement; and PA0 c) either PA1 i) ignoring the variations if they do not correspond to a predetermined sequence, or PA1 ii) if the variations do correspond to a predetermined sequence, executing the instructions which correspond to that sequence. In another broad aspect, the invention provides a drill string stabilizer comprising a mandrel, slidably mounted within an outer casing; one or more pads movable between a retracted position and one or more extended positions; means monitoring the rate of flow of, or pr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.