Research and Prospects of Efficient and Low-carbon SAGD Development Technology for Shallow Ultra-Heavy Oil in Xinjiang Oilfield

doi:10.3969/j.issn.1006-6535.2024.01.001

Abstract

Abstract: In response to the increasing contradiction between high energy consumption for ultra-heavy oil development and high quality development of oilfield in the context of “carbon neutrality and emission peak” target, Xinjiang Oilfield, through mechanism research and field practice, has continued its research and achieved significant results in maintaining efficient expansion of steam chamber, breaking through reservoir seepage barrier blockage, improving the steam flooding and gravity drainage efficiency in shallow and thin layers, and achieving efficient and balanced fluid production in long horizontal sections of horizontal wells: the gas-assisted technology is employed to achieve the insulation, pressure retention and energy boosting of steam chambers, and the oil-to-steam ratio can be increased by up to 20%; the vertical well pattern and reservoir upgrading and expansion technologies are utilized to improve the seepage characteristics of Class Ⅲ ultra-heavy oil reservoirs, and the drainage rate can be increased by 20% to 40%; the fully confined production method is adopted, resulting in an increase in VHSD produced liquid temperature from 100 ℃ to 150 ℃ and a 50% increase in oil recovery rate; a further research on the mechanism of thermal recovery flow control device (FCD) is conducted, and the reservoir-wellbore coupling optimization design method is improved, so the production degree of the horizontal section of horizontal wells can be increased by 20%. During the “14th Five-Year Plan” period, Xinjiang Oilfield will conduct a further research of solvent-assisted SAGD, waterless SAGD and temperature-controlled hydrothermal fracturing technologies, and gradually improve the series of low-carbon and high-efficiency development technologies for shallow ultra-heavy oil. The research can provide technical guidance for the development of similar reservoirs.

Key words: shallow ultra-heavy oil, gravity drainage, flooding-drainage combination, gas-assisted, reservoir expansion, low-carbon development technology

CLC Number:

TE345

Sun Xin′ge, Luo Chihui, Zhang Shengfei, Zhang Wensheng, Luo Shuanghan. Research and Prospects of Efficient and Low-carbon SAGD Development Technology for Shallow Ultra-Heavy Oil in Xinjiang Oilfield[J]. Special Oil & Gas Reservoirs, 2024, 31(1): 1-8.

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