An Experimental Study on Steam Flooding After Huff and Puff in Deep Super Heavy Oil Reservoir

doi:10.11885/j.issn.16745086.2020.03.24.02

Abstract

Abstract: The deep super heavy oil reservoir in Shu1 area of Liaohe Oilfield has been developed by steam stimulation for many years, and has achieved certain development results. However, after entering into mid-and late stage of huff and puff, it is faced with the problems of low cycle oil production, low oil steam ratio, increasing difficulty of stable production, etc., so it is urgent to study the replacement technology after steam stimulation. In this paper, the influence factors, control strategies and production characteristics of steam flooding after huff and puff are studied by using the high temperature and high pressure proportional physical simulation device. The results show that the characteristics of temperature field formed in the steam huff and puff stage have great influence on the subsequent steam flooding development. The preconditions for steam stimulation to steam flooding are:first, the temperature of thermal connection between injection and production wells should be above the critical temperature of crude oil; second, the volume of steam cavity cultivated in the stimulation stage should be large enough, and the lateral sweep should be about one third of the injection production well spacing; the adjustment of injection production well section is an important factor to improve the effect of steam flooding. For the case that there is no stable interlayer in the layer, the steam injection in the lower 1/2 well section can effectively restrain the steam body overlap and improve the recovery degree. When the steam flooding reaches the stage of denudation production, adjusting the production well from the whole well section to the lower 1/2 well section can enlarge the wave and volume to a certain extent and improve the recovery degree; the production characteristics of super heavy oil steam drive are mainly denudation, supplemented by displacement. The results provide a theoretical basis for the optimization design of the development plan and field test after steam stimulation in deep super heavy oil reservoir.

Key words: super heavy oil reservoir, steam flooding, transfer temperature, displacement characteristics, control strategy, experimental research

CLC Number:

TE357

ZHAO Qinghui, ZHANG Hong, YANG Xingchao, CHENG Haiqing, PAN Pan. An Experimental Study on Steam Flooding After Huff and Puff in Deep Super Heavy Oil Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(3): 146-154.

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