Pig delivery and transport system for subsea wells
US5842816A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 4, 1998 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | May 4, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/4273
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pig delivery and transport system shown schematically in FIG. 1 has a looped line generally indicated at (10) divided into three sections (10A), (10B) and (10C). Line section (10A) is a low pressure non-product line section extending from a product receiving facility (PF) or host to an upstream shut-off valve (20). Line section (10B) is a high pressure product line section extending from downstream shut-off valve (22) to host facility (PF) and receives product from wells (W1) and (W2). Intermediate line section (10C) is a connecting line section between shut-off valves (20) and (22) to connect the non-product line section (10A) to the product line section (10B). A pig inserted at host (PF) is transported along low pressure non-product line section (10A) into connecting line section (10C) while upstream shut-off valve (20) is open and vent valve (28) is open in vent line 26. For transfer of the pig to the product line section (10B), shut-off valve (20) and vent valve 28 are closed and shut-off valve (22) is opened with a boost fluid obtained from a pressurized fluid source (32) through boost line (30) pushing the pig past branch lines (12) and (14) from wells (W1) and (W2). In thi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.