By-pass pig passes test for two-phase pipelines

Journal Article · Mon Oct 14 04:00:00 EDT 1996 · Oil and Gas Journal

OSTI ID:382937

Wu, H L; Spronsen, G van; Klaus, E H; Stewart, D M

A simulation model of the dynamics of a by-pass pig and related two-phase flow behavior along with field trials of the pig in a dry-gas pipeline have revealed significant gains in use of a by-pass pig in modifying gas and liquid production rates. The method can widen the possibility of applying two-phase flow pipeline transportation to cases in which separator or slug-catcher capacity is limited by practicality or cost. Pigging two-phase pipelines normally generates large liquid slug volumes in front of the pig. These require large separators or slug catchers. Using a high by-pass pig to disperse the liquid and reduce the maximum liquid production rate before pig arrival has been investigated by Shell Exploration and Production companies. A simulation model of the dynamics of the pig and related two-phase flow behavior in the pipeline was used to predict the performance of by-pass pigs. Field trials in a dry-gas pipeline were carried out to provide friction data and to validate the model. The predicted mobility of the high by-pass pig in the pipeline and risers was verified and the beneficial effects due to the by-pass concept exceeded the prediction of the simplified model.

• OSTI ID: 382937
• Journal Information: Oil and Gas Journal, Journal Name: Oil and Gas Journal Journal Issue: 42 Vol. 94; ISSN OIGJAV; ISSN 0030-1388
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
BYPASSES
COMPUTERIZED SIMULATION
DESIGN
DISPLACEMENT RATES
FLOW BLOCKAGE
MAINTENANCE
MAINTENANCE FACILITIES
MITIGATION
PIPELINES
TWO-PHASE FLOW