Banca de DEFESA: GABRIEL BESSA DE FREITAS FUEZI OLIVA
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.STUDENT : GABRIEL BESSA DE FREITAS FUEZI OLIVA
DATE: 18/10/2021
TIME: 15:00
LOCAL: wnx-hdpu-zvn
TITLE:
MODELLING AND SIMULATION OF A CONVENTIONAL SUCKER-ROD PUMPING UNIT USING SIMSCAPE MULTIBODY ™ ENVIRONMENT
KEY WORDS:
Sucker-Rod Pumping Units, Intra-Stroke Speed Profile, Gearbox Torque, Artificial Lift, Simscape Multibody™, Modelling and Simulation of Physical Systems.
PAGES: 180
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Eletrônica Industrial, Sistemas e Controles Eletrônicos
SPECIALTY: Automação Eletrônica de Processos Elétricos e Industriais
SUMMARY:
The Sucker-Rod Pumping (SRP) system is the most used artificial lift method in oil wells in Brazil and in the world. The widespread use of this method can be justified by its relatively simple, reliable and durable structure, convenient maintenance, etc. The need to increase the production of oil and gas, due to the growing global energy demand, has stimulated the development of a complex industry driven by technology. Due to the popularity of the SRP systems in the oil industry, over the years, many studies have been developed to contribute to the evolution of the method. The first researches carried out had as the main goal the modification of the geometric structure of the pumping units, so that the SRP Units could work in different operational conditions, thus increasing the flexibility of using the method. Subsequently, with technological advances and the advent of industrial automation, new studies were carried out in order to apply control strategies to the SRP systems, among which the Pump-Off controllers (POC) and Variable Speed Drive controllers (VSD) stand out. It should also be noted that recent researches have been carried out aiming to improve the operation of the SRP Units from the modification of the speed profile during the same pumping cycle. In addition, recent computational advances have enabled the development of SRP simulators, as well as software for modelling and simulation the SRP system. Thus, there is an opportunity to develop a more accurate model, capable of accurately reflecting the operation of the Sucker-Rod Pumping Units. In this context, this work proposes to model a conventional SRP Unit using the tools of the Simscape Multibody™ (a MATLAB’s library of the Simscape™ environment for modelling and simulation of physical systems), and to carry out specific studies with the developed model that are not commonly seen in the current literature. Among these studies, simulations were carried including dissipative friction forces in the components of the SRP unit to analyse the impact that these forces can generate on the gearbox torque curve. Furthermore, simulations were also carried out with the SRP unit operating with variable speed drive profiles throughout the pumping cycle (intra-stroke speed profile), until a speed profile that would improve the operation of the equipment was experimentally determined. As a result of this study, it was possible to demonstrate the feasibility of manipulating and redistributing the intra-stroke speed profile to achieve objectives such as: counterbalancing the SRP unit and keeping the gearbox maximum torque of the equipment within the recommended limits, as well as reducing the portions where the net torque values were negative. In order to validate the developed model, simulations were performed and the obtained results were compared to other traditional calculation methodologies existing in the literature. Moreover, it was analysed whether the behaviour of the modelled system was consistent if compared to what is seen in practice when certain procedures are performed in real SRP units.
BANKING MEMBERS:
Presidente - 350693 - ANDRE LAURINDO MAITELLI
Interna - 6350734 - CARLA WILZA SOUZA DE PAULA MAITELLI
Externo ao Programa - 1149567 - ANDRES ORTIZ SALAZAR
Externo à Instituição - FABIO SOARES DE LIMA - PETROBRAS
Externo à Instituição - JOÃO PAULO LOBO DOS SANTOS - UFS