Grease injection control head having a specific gas trap
US4476924A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1983 |
| Grant date | Oct 16, 1984 |
| Priority date | — |
| Expiry date | Mar 7, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/072
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A grease injection control head for maintaining a seal about a wire performing wireline operations in a well. A tubular body includes a grease injection port for injecting grease for counteracting pressure in the well with a vent port above the injection port for venting fluids. A plurality of tubular members are provided in the body positioned between the injection port and the vent port. Each member includes a close fitting longitudinal bore for passage of a wireline for providing a grease pressure seal. The members are telescopically and sealably joined to adjacent members. The members include an enlarged cavity about the bore at each end for providing a turbulent grease chamber between adjacent members for distributing the pressure drop along the body for reducing loading on the wire and friction with a minimum length body. The length of a longitudinal bore relative to the longitudinal length of a chamber is no greater than 5:1. The body includes a second vent port above the first vent port for acting as a wiper vent port with one or more tubular members between the vent ports. A gas trap may be provided in the body below the injection port for trapping gas from the well. The t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.