Stereoscopic Waterflooding Technology and Its Application in Niudong Volcanic Oil Reservoir

doi:10.7657/XJPG20200615

Abstract

Abstract:

Niudong volcanic oil reservoir is a kind of special oil reservoir of abnormal temperature and normal pressure. It was formed by multiple stages of volcanic eruption, so the reservoir is on a small scale. In the reservoir, there are developed fractures that are dominated by almost low-angle and horizontal cracks, and oil layers cover a large span vertically, and each layer is very thick and heterogeneous. During the early development, rapid production decline occurred in the wells developed by depletion method; water flooding pilot test was carried out in vertical well groups, the daily oil production of adjacent wells increased slightly; and the EOR result of cyclic water injection pilot test in horizontal wells was not very good, indicating that the waterflooding effect was not oblivious. Regarding these problems, a vertical-horizontal well-mixed, stereoscopic waterflooding technology has been established based on the optimizations of cyclic water injection, well pattern adjustment and fracturing program, which can effectively improve the waterflooding effect in volcanic oil reservoirs. The actual application of the technology in horizontal wells exhibits a good effect with the well response rate of 44.4%, the initial incremental oil production of 1.7 t/d per well, and the expected enhanced oil recovery of 5.7%, which can provide references for the development of the other similar oil reservoirs.

Key words: Niudong volcanic oil reservoir, Kalagang formation, horizontal well, cyclic water injection, stereoscopic water injection, mixed well pattern, waterflooding effect, potential evaluation

CLC Number:

TE341

WU Mei’e, ZHANG Zhongjin, ZHANG Mei, PAN Youjun, XIE Shijian, CHEN Changxu. Stereoscopic Waterflooding Technology and Its Application in Niudong Volcanic Oil Reservoir[J]. Xinjiang Petroleum Geology, 2020, 41(6): 735-739.

Figures/Tables 5

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