ESP Assisted Production Allocation in Peregrino Field

Abstract

The Peregrino field is located in Campos Basin approximately 85 km offshore from Cabo Frio in Brazil. The oil in Peregrino is heavy with a gravity of 14° API. First phase of field development will be accomplished by two drilling capable wellhead platforms tied back to a central FPSO. A Total of 30 producer and 7 water injector wells are planned for this phase.One of the most critical factors in offshore operations is physical space. Flow allocation devices like test separators can be bulky due to the large capacities required to operate with heavy oil. These and the gear required for their control and efficient operation like heaters can be among the most space consuming equipment onboard. Multiphase flow meters are also available for flow allocation purposes; however its accuracy is highly impacted by heavy oils. The slow gas flashing out of heavy oils affects the representativeness of necessary pressure-volume-temperature (PVT) characterization.Downhole Venturi meters were other alternative considered when deciding about the flow allocation method for Peregrino. These were initially left behind basically due to two factors; the economical impact related with a single unit required per well and the limited data available regarding its uncertainty with viscous oil. The changing oil/water conditions in Peregrino can be a challenge from a viscosity modeling point of view. Therefore a decision was made in favor of the flow allocation based in Electric Submersible Pumps (ESPs) performance. This technique has been used with success in wells with very high water cuts but it's a novel approach in viscous oil.Improving the accuracy of this approach required multiple tests with the submersible pump models selected for Peregrino field. The tests were performed in a high viscosity flow loop in Claremore and covered a wide range of viscosities and speeds. This paper outlines the test results and presents the principles of flow allocation in Peregrino.

Real-Time Aging of Ethylene-Propylene-Diene Rubber Inside Jacket Layer of Electrical Submersible Pump Cables Under Actual Operating Conditions

“…. 65 Figure 33 CKA method plot for calculation of the reaction order of all rubbers, under N2 atmosphere at 20 ml min -1 , in non-isothermal conditions at heating rates 5,10,15,20,30 7 Average TGA results for rubbers after being evaluated at 7 heating rates (5,10,15,20,25,30 Table 10 Results of the kinetic data obtained by the KMW method for the 6 rubbers, under N2 atmosphere at 20 ml min -1 and non-isothermal conditions at heating rates 5, 10, 15, 20, 30 and 40 ºC min -1 . ....................................... 54 Table 11 Results of the OFW method for Rubber I, under N2 atmosphere at 20 ml min -1 and non-isothermal conditions at heating rates 5, 10, 15, 20, 30 and 40 ºC min -1 , assuming n=1.…”

“…The ESP cable group that was used in the A-29 and B-17 oil wells, both in the Peregrino field, were operating for 738 days (2 years) and 1752 days (4.8 years), respectively. The initial reservoir conditions are 78°C at 2300 m (7550 feet Total Measured Depth) and the pressure varying from 740 to 3,350 Psia (can be calculated as a function of hydrostatic pressure) [65]. The depths, times and information raised are shown in Table 2.…”

Integração de dados geológicos e geofísicos por métodos de simulação estocástica para a modelagem geológica do Campo de Peregrino, Bacia de Campos

“…A presença de hidrocarbonetos foi descoberta pelo poço exploratório 1-RJS-498-RJ, perfurado pela PETROBRAS em 1994. Atualmente a empresa Statoil é a operadora do campo com 60% de participação, enquanto a empresa Sinochem tem os 40% restantes (Olsen et al, 2011;Makler et al, 2011;Pettan e Strømsvik, 2013;ANP, 2016).…”

“…O Campo de Peregrino possui um grande volume de óleo inicialmente in place, com cerca de 2 -2,5 bilhões de barris estimados para a Fase I de desenvolvimento. O reservatório é preenchido por um óleo de densidade de 13 a 16º API e viscosidade variando entre 102,8 e 142,2 cP, tornando-se um dos óleos mais pesados produzidos em offshore no Brasil (Olsen et al, 2011;Makler et al, 2011;Pettan e Strømsvik, 2013;Haugen et al, 2015).…”

“…Os valores de STOIIP para o Campo de Peregrino -Fase I varia de 2,0 -2,25 bilhões de barris, com o caso otimista igual a 2,203 bilhões de barris, o caso base com 2,159 bilhões de barris e o caso pessimista com 2,119 bilhões de barris, condizendo com os valores entre 2,0 -2,5 bilhões (bbl) citados por Olsen et al, (2011) e Pettan e Strømsvik (2013).…”