Study on the Response Characteristics of Fire Flooding in Water-flooded Heavy Oil Reservoirs

doi:10.3969/j.issn.1006-6535.2020.05.019

Abstract

Abstract: In order to enhance oil recovery after converting from steam huff and puff in water-flooded heavy oil reservoirs, starting from the development mechanism of fire flooding, the research of physical simulation and numerical simulation were carried out. Two kinds of water-flooded models were established, namely strong and weak water-flooded models, respectively. The development mechanism increasing pressure and displacing water of fire flooding in water-flooded reservoirs was revealed. Establish judgement criterions based on evaluation parameters, such as changing law of fluid produced, firing indicator of fire flooding, etc. The fire flooding of water-flooded reservoirs was divided into four stages, and development law of fire flooding in water-flooded heavy oil reservoir was clarified. The research results show that fire flooding in water-flooded heavy oil reservoir has lots of characteristics, such as pressure increasement, water displacement, long water-displacement time, long firing time, high gas injection demand, high heat release, high peak oil production, and good viscosity reduction effect. The research results were successfully implemented in Jin 91 block in Liaohe Oilfield, and the response of fire flooding was obvious. The research has a technical guiding significance in efficient development of reservoirs with edge-bottom water or water-flooded heavy oil reservoirs.

Key words: water-flooded heavy oil reservoir, fire flooding, pressure increasing and water displacing stage, gas injection intensity, response characteristics, Liaohe Oilfield

CLC Number:

TE357

Cai Ye. Study on the Response Characteristics of Fire Flooding in Water-flooded Heavy Oil Reservoirs[J]. Special Oil & Gas Reservoirs, 2020, 27(5): 125-131.

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