Banca de QUALIFICAÇÃO: DANIELLE ALVES RIBEIRO DA SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : DANIELLE ALVES RIBEIRO DA SILVA
DATE: 24/08/2022
TIME: 08:30
LOCAL: Virtual
TITLE:

Parametric study of hysteresis in a reservoir with characteristics of brazilian pre-salt 

KEY WORDS:

Pre-salt, miscible WAG CO₂, hysteresis, relative permeability.

PAGES: 161
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

he reserves of the Brazilian pre-salt are fields with light oil and a large amount of dissolved CO₂. This CO₂, when produced, can be treated and, then, released or reused as injection gas in the alternating injection process of water and gas (WAG-CO₂). Since some pre-salt reservoirs are carbonated, oil wet. The present study aimed to use the miscible WAG-CO₂ injection in a semi-synthetic, carbonate, oil-watering reservoir, with characteristics similar to those found in the Brazilian pre-salt, high pressure and low temperature, to create a reservoir simulation model where the parameters related to hysteresis of relative permeability were analyzed. For this, a light oil with a content of about 8% molar of CO₂ was modeled, the relative permeabilities were plotted through the Corey correlation, being produced through an inverted five-spot mesh in a 30-year project. The main objective of this research was to analyze two models of hysteresis (Killough and Larsen and Skauge) widely used in industrial simulators. Hysteresis reduced fluid permeability, which can generate two effects: increased local oil sweep efficiency and loss of injectivity. The first effect contributes to the increase in oil recovery, while the loss of injectivity, depending on the operating conditions of the wells, presented a reduction in the quantity of fluids injected, hampering the recovery. Therefore, based on the results the current work concluded that for the reservoir studied (oil wet), hysteresis causes loss of injectivity only to water and not to gas, however only influencing the water injection there was a reduction of approximately 2.42% in RF in relation to the case without hysteresis. Moreover, when increasing only the injection pressure of the water injector well to 90,000kPa, the previously identified loss of injectivity was eliminated and a 2.01% increase in RF was achieved, comparing it with the case without hysteresis. 

COMMITTEE MEMBERS:
Externo ao Programa - 1752014 - EDNEY RAFAEL VIANA PINHEIRO GALVAO - nullExterno à Instituição - EDSON DE ANDRADE ARAÚJO - UFCG
Presidente - 1679234 - JENNYS LOURDES MENESES BARILLAS