Soluções para Dutos e Terminais · Estudo de caso
Cestoil CDR2081: Aumento da vazão em oleoduto de petróleo bruto do porto à refinaria
Um teste realizado em um oleoduto de 63,8 km no sul da China registrou um aumento de 21,7 % na capacidade de vazão diária equivalente com a utilização de 14 ppm do aditivo CDR2081. Duas bombas da linha principal permaneceram em operação, com a válvula de descarga mantida em 60 % de abertura, enquanto a vazão medida aumentou e a pressão de descarga diminuiu.
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Contexto operacional e objetivo
A Oleoduto de petróleo bruto de 63,8 km e DN500 conectava um terminal costeiro a uma refinaria no sul da China. A operadora buscava maior capacidade de entrega utilizando suas bombas e seu oleoduto existentes, dentro de um Limite de pressão de projeto de 5,0 MPa.
O contexto operacional no relatório descreve aproximadamente 30.000 t/d a 4,5 MPa com duas das quatro bombas da linha principal em operação. Uma terceira bomba aumentou a capacidade para cerca de 33.000 t/dia a 5,0 MPa. A operadora já utilizava um redutor de arraste nacional e queria avaliar uma alternativa em comparação com essa referência.
O acordo técnico especificou um ganho de vazão de pelo menos 15 % a no máximo 15 ppm, com operação de duas bombas. O desempenho seria avaliado no medidor de vazão da saída das bombas, após o preenchimento da linha com petróleo bruto tratado.
Produto e serviço técnico
Cestoil CDR2081 é um redutor de arraste à base de poliolefina de alto peso molecular. Ele foi projetado para reduzir o atrito turbulento no escoamento em tubulações, permitindo maior vazão ou menor pressão para uma determinada condição operacional.
Cestoil e a operadora definiram as condições do teste e monitoraram a dosagem, a vazão, a pressão e a posição da válvula. Uma tentativa inicial, realizada em agosto, foi interrompida devido a um problema na vedação da bomba de injeção. Cestoil retornou com a bomba reparada, e o teste foi concluído em 2 de setembro de 2010.
O operador manteve a válvula de saída da bomba em 60% e manteve duas bombas da linha principal em operação. A manutenção dessas configurações permitiu a comparação das leituras operacionais; isso não estabelece que todas as demais condições hidráulicas fossem idênticas.
Condições do estudo e sequência de tratamento
| Parâmetro | Detalhe relatado |
|---|---|
| Crude | Oman crude; density 866 kg/m³; kinematic viscosity 8.8 mm²/s at 50 °C |
| Pipeline | 63.8 km, DN500; volume 13,600 m³; crude temperature approximately 34 °C |
| Injection start | 13:00 on 2 September 2010, at an initial flow of 1,300 t/h |
| Full-line treatment | Estimated arrival at the refinery at 21:30; evaluation from 22:00 |
| CDR2081 injection | 21.3 kg/h; reported dose 14 ppm during the evaluation period |
| Monitoring | Hourly flow, outlet pressure, valve opening and cumulative injection |
| Trial duration and reference | Injection stopped at 24:00 after 11 hours because receiving tankage was limited. Untreated readings were taken the next day at the same valve position. |
Reported results and comparison bases
| Measure | Reference | With CDR2081 |
|---|---|---|
| Measured hourly flow | 1,236–1,244 t/h, untreated the next day | 1,476–1,512 t/h after the line filled with treated crude |
| Daily-equivalent delivery capacity | 30,000 t/d, operator’s untreated capacity estimate | 36,500 t/d at 14 ppm; reported gain 21.7% |
| Outlet pressure during the trial | 3.96 MPa at injection start | 3.48–3.52 MPa at full treatment; approximately 0.46 MPa lower at the 3.50 MPa midpoint |
| Incumbent DRA benchmark | 20.7% reported throughput gain at 15 ppm | 21.7% at 14 ppm: 1.0 percentage point more gain at 1 ppm less additive |
The operator recorded performance above the agreement’s ≥ 15% gain at ≤ 15 ppm target. Its report concluded that CDR2081 reduced pipeline friction and increased delivery capacity using the existing pumps and line.
The report also compares 36,500 t/d with two pumps and CDR2081 at ≤ 4.05 MPa with the historical three-pump, untreated operating point of 33.000 t/dia a 5,0 MPa. This supports the operational case for evaluating DRA before adding pumping duty.
The 30,000 and 36,500 t/d figures are the operator’s daily-equivalent capacity estimates, not measured 24-hour totals: injection lasted 11 hours. These estimates are separate from the measured hourly-flow ranges. The pressure comparison uses injection-start and full-treatment readings, while the hourly-flow comparison uses the next-day untreated reference. The incumbent benchmark and historical three-pump operating point were reported separately, rather than established as simultaneous matched tests. Pump power and monetary savings were not measured in the supplied summary.
Valor operacional
The reported capacity difference is approximately 6,500 t/d. Sustaining that additional capacity for an assumed 330 operating days would represent about 2.1 million tonnes/year of additional deliverable capacity. This is a projection, not an observed annual production or delivery result.
For a site-specific economic evaluation, compare the value of additional delivery and any avoided alternative transport with the cost of additive, injection support and measured pumping energy. At a reported rate of 36,500 t/d and 14 ppm by mass, additive use would be approximately 0.51 t/d, consistent with extending the 21.3 kg/h injection rate over 24 hours.
Operators reported a preference for CDR2081 because it lacked the irritating odour they associated with the incumbent. This is an operator observation. The source also describes CDR2081 as metal-free; it does not provide analytical or downstream-unit measurements that establish those product claims through this trial.
Aplicando as descobertas
Confirm injection-pump readiness and receiving-tank capacity before starting the trial. Agree the pump configuration, valve setting, dosing basis and acceptance criteria with the operating team.
Log flow, outlet pressure, crude properties and cumulative injection together. Estimate treatment arrival from line volume divided by volumetric flow, converting mass flow using crude density where needed, and allow full-line treatment before evaluating performance.
Take untreated reference readings at the agreed operating settings and record any changes in crude, temperature, tank conditions or pumping duty. A useful economic trial should also record electrical power and the actual cost of alternative delivery routes.
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Share your pipeline length, diameter, volume and design pressure; pump curves and current pump configuration; typical flow–pressure logs; crude density and viscosity; and available receiving tankage. Cestoil’s technical team can help define the dose, injection equipment and monitored trial plan.
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