PPSA Pigging Seminar A new new pipeline cleaning technology: Hydraulically Activated Power Power Pigging
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1 PPSA ging Seminar 2007 A new new pipeline cleaning techlogy: ging (HAPP (HAPP TM TM )) by Björn Stoltze for 1
2 Introduction Introduction Deposition of wax, hydrates or other substances are a consequence of the chemical composition of the crude oil (i.e. wax content, ) hydrodynamic conditions in the pipeline (i.e. flow velocity, turbulences, ) thermodynamic conditions in the pipeline (i.e. pressure, temperature, ) pipeline wall physics (i.e. material, roughness, ) Consequences of deposition of wax, hydrates or other substances are reduced reduced inner inner diameters diameters & increased increased wall wall roughness roughness restricted restricted flow flow higher higher pump pump capacities capacities for for compensation compensation rising rising operation operation costs costs & pipeline pipeline blockage blockage Prevention and cure strategies: 1. Adjustment of chemical, physical and thermodynamic crude oil properties. 2. Pipeline pigging 2
3 Today s cleaning methods Today's typical cleaning pigs Utility s Cleaning s Sealing s Brush s Mandrel s Plug s Scraper s Foam s Dependent Hydraulic Jet s Solid cast s Spherical s 3
4 Characteristics of cleaning pigs Cleaning force / effectiveness Product flow Pipeline Deposits Mechanical force (scraping) between pipe inner wall and the pig s cleaning edge + easy to establish - t controllable + a faster pig velocity results in a - a faster pig velocity results in a superficial higher impact on deposits deposit removal - up to many pig runs might be necessary - cleaning edge smears wax back onto wall High pressure water jets fed through hoses + very strong cleaning force - limited in reach + high effectiveness 4
5 Characteristics of cleaning pigs Deposit removal Removed deposits are usually pushed out of the line with the pig moving forward plug formation in front of the pig high risk of pig getting stuck several pig runs with different pig diameters might be required Deposit removal with bypass flow through the cleaning pig removed deposits are permanently flushed down-stream less risk of plug formation thus pipeline blockage Today s general rules to avoid pipeline blockage by accumulated deposits in front of pigs 1. select pig type(s) 2. thoroughly determine pig size (diameter) 3. determine number of cleaning runs needed Set-up of a pigging job requires extended time, effort and experience is very expensive! 5
6 Characteristics of cleaning pigs Pipeline operations Regular pigging programs: ging is done after build up of a defined wax layer or in periodical intervals Line can be kept in operation Line heavily effected: A thoroughly established pigging program is required Several pigging runs Operations are interrupted or reduced Line is blocked: No operations at all anymore! Interruption of pipeline operations is most undesired by pipeline operators as it causes ermous secondary ecomic losses. 6
7 Characteristics of cleaning pigs Comparison of cleaning pig features Feature Active cleaning force N of cleaning runs required Risk of getting stuck Adjustable travel speed Reach Cleaning effectiveness Mandrel pigs many high unlimited low Foam pigs many high unlimited low Solid cast pigs many high unlimited low Spherical pigs or spheres many high unlimited low Brush pigs less many less high unlimited low/medium Scraper pigs less many less high unlimited medium/high Dependent Hydraulic Jet s yes only one ne yes limited very high 7
8 HAPP how it cleans Main Components Brake system Seal Cleaning head 8
9 Energy balance Pressure over pipe length P [bar] 100 Max. operating pressure 80 P operating = P available for transport Pipe length Pumping station 9
10 Energy balance Two ways to drive a HAPP TM 1. Pumping pressure can be increased: p [bar] 100 Required cleaning energy is taken from the additional pumping energy. Operating pressure and flow is entirely maintained MAOP 2. Pumping pressure can t be increased: p [bar] 100 Required cleaning energy is taken as part from the transportation energy. Operating pressure and flow are lowered for the energy share used for cleaning. MAOP 80 P used for cleaning P remaining for transport P pigging > P operating P used for cleaning P pigging = P operating P remaining for transport Pipe length Cleaning Cleaning energy energy = p p x flowrate Pipe length 10
11 HAPP how it cleans Technical features Pipeline Pipeline inner inner diameters:.. diameters:.. > 6 6 Cleaning Cleaning method: method: high high pressure pressure fluid fluid jets jets Cleaning Cleaning efficiency:... efficiency:... one one single single pigging pigging run run 100% 100% clean clean deposit deposit removal removal even even out out of of pits pits freeing freeing of of captured captured water water Cleaning Cleaning pressure pressure needed:...depending on on deposit deposit properties properties (usually (usually bar) 30bar) Travel Travel direction:...reversible (flow (flow reverse) reverse) Brake Brake force:...adjustable, remains remains the the same same over over the the cleaning cleaning run run lowers lowers to to zero zero if if an an obstacle obstacle blocks blocks the the pig pig Travel Travel speed: adjustable adjustable down down to to times times slower slower than than the the fluid fluid speed speed Removal Removal of of debris:.. debris:.. continuously continuously by by bypass bypass flow flow Pipeline Pipeline operations:... can can be be maintained maintained while while pigging pigging Pipeline Pipeline geometry:.. negotiation negotiation of of T-fittings, T-fittings, steps, steps, deformed deformed pipe pipe ID, ID, welding welding lines, lines, elbows, elbows, etc. etc. 11
12 HAPP units Cleaning head Cleaning head connected to 288 psi (19,8 bar), 48 gpm (182 l/min) water supply. 12
13 HAPP units Cleaning head Flow pattern of a cleaning head at 140 psi (9,7 bar) and 160 gpm (606 l/min). 13
14 HAPP units Seal unit with cleaning head Seal body with rigid and wear resistant seal cups installed. 14
15 HAPP units Brake mechanism Test set-up to determine the brake systems travel speed/brake force characteristics. A hydraulic ram was used to pull the brake systems through a pipe section. 15
16 HAPP units HAPP TM prototype unit HAPP prototype design based on the cleaning head and brake system tests. 16
17 HAPP units Seal unit Seal incorporating seal body with polyurethane seal cups. 17
18 HAPP units Brake unit Housing of the brake unit 18
19 HAPP units Launch of a HAPP TM unit HAPP TM ready for launching 19
20 HAPP units Reception of a HAPP TM unit HAPP TM after a cleaning run of the 7.3 miles, 6.25 inches Braheney Line [operated by Equilon Pipeline Company, Denver City, TX pipeline contained 4 elbows à 22.5, radius: 1.5 D] 20
21 References References The 6 inch HAPP has been tested as following: Cleaning efficiency has been tested & verified in paraffin contaminated spool pieces of the test loop facilities of SHELL E&P Techlogy Company, Houston, USA. Mechanical reliability has been tested & verified in the test loop of Aqua Drill International, Dickinson, Texas, USA. A complete & successful cleaning job has been carried out at the 7,3 miles onshore crude oil line in Denver City, Texas, USA. [Braheney Line, ID: 6,25, operated by Equilon Pipeline Company] 21
22 Advantages with respect to other pigging techlogies on the market Operations: Effectiveness: Pipeline operation can continue while pigging. No limits in operation reach. The adjustable and controlled travel speed allows an extraordinary pigging effectiveness: With only one single cleaning run the pipeline is 100% clean! Various cleaning heads are available for removal of all kind of deposits. Active pigging: The local pressure difference across a HAPP can be transformed in any kind of cleaning energy (brush, high pressure fluid jets, rotating, etc.). The HAPP construction allows negotiation of T-fittings, steps, deformed pipe ID, welding lines, elbows, etc. Debris removal: activated cleaning prevents plug formation by constantly carrying away debris downstream. Safety: No conventional pig blocking due to debris plug in front of it. 22
23 PPSA ging Seminar 2007 Thank Thank you you for for your your attention! Björn Stoltze for 23
A new pipeline cleaning technology: Hydraulically Activated Power Pigging (HAPP TM )
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