Retrievable pig
OwnerBenton F. Baugh, Jim Bob Crawfordinventors
Life of this patent
Estimating the term…
Abstract
A pig for pumping thru pipelines for the cleaning of the pipelines which provides for fishing neck type profiles for remote attachment and removal in case of pipeline blockages, provides for the fishing neck type profiles to include valving which will allow communication between the ends of the pig to prevent hydraulic locking in the high pressure ambient condition of subsea pipelines, and provides for interconnection and operation of valving on each end of the pig.
Claims10
A retrievable pig for cleaning a pipeline comprising
- an insert tube having a first end and a second end,
- an outer portion external to said insert tube for sliding near or against the inner wall of said pipeline for cleaning said inner wall of said pipeline,
- a first valve means on said first end having a fishing profile which is opened when a fishing tool pulls on said first fishing profile
- a second valve means on said second end is opened when said fishing tool pulls on said first fishing profile on said first end
- wherein said second valve means is mechanically linked to said first valve means, such mechanical link causing the opening movement of said first valve to be transferred to said second valve as an opening movement.
A retrievable pig for cleaning a pipeline comprising
- an insert tube having a first end and a second end,
- an outer portion external to said insert tube for sliding near or against the inner wall of said pipeline for cleaning said inner wall of said pipeline,
- a first valve means on said first end having a fishing profile which is opened when a fishing tool pulls on said first fishing profile,
- a second valve means on said second end is opened when said fishing tool pulls on said first fishing profile on said first end
- wherein said first valve means and said second valve means are independently adjustable with respect to their contact with respective sealing surfaces.
A retrievable pig for cleaning a pipeline comprising
- an insert tube having a first end and a second end,
- an outer portion external to said insert tube for sliding near or against the inner wall of said pipeline for cleaning said inner wall of said pipeline,
- a first valve means on said first end having a fishing profile which is opened when a fishing tool pulls on said first fishing profile,
- a second valve means on said second end is opened when said fishing tool pulls on said first fishing profile on said first end
- wherein said second valve means has a fishing profile which can be engaged by a fishing tool and will be opened when said fishing tool pulls on said fishing profile.
A retrievable pig for cleaning a pipeline comprising
- an outer portion for sliding near or against the inner wall of said pipeline,
- one or more fishing profiles on one or more ends of said pig for engagement by a fishing tool for the recovery of said pig from said pipeline
- wherein pulling on one of said fishing profiles will allow circulation between the upstream end of said pig and the downstream end of said pig.
Dependencies are inferred from the claim text.