Development practices of geology-engineering integration on upper sweet spots of Lucaogou Formation shale oil in Jimsar sag, Junggar Basin

doi:10.3969/j.issn.1672-7703.2019.05.014

Abstract

Abstract: The shale oil resource accumulation and development potential of the Lucaogou Formation (P2l) in Jimsar sag, Junggar Basin are huge. Since the production breakthrough of the horizontal well Ji 172_H, the volume fracturing technology has been tested on 10 horizontal wells with the goal of shale oil scale benefit development, but the production results have not reached the expected level. Through the geology-engineering integration, on the basis of determining the P2l22-2 lithic feldspar fine siltstone layer as the high-quality sweet spot and the clear recognition that high-quality sweet spot drilling rate is the geological guarantee of post-fracture high-yield, the restriction from the bedding plane and high-strength mudstone barrier to the vertical extension ability of the artificial fracture are analyzed, the differences of fracturing transformation parameters of the horizontal well which volume fracturing has been implemented are compared, and the technical countermeasures of intensive spacing and high intensity volume fracturing of horizontal wells for improving the production and efficiency are proposed. The development test well deployed in 2017 created a new production record with a maximum daily output of 108.3t and a total production of over 10,000 tons of oil in 240 days. In 2018, 10 horizontal wells were put in test and the average daily oil production was 50.4 tons. It is proved that the intensive spacing and high intensity volume fracturing of horizontal wells can effectively improve the single well production and achieve higher development benefits, which lays a solid technical foundation for the scale development of the Jimsar sag shale oil and provides a strong engineering support.

CLC Number:

Wu Baocheng, Li Jianmin, Wu Yuanyue, Han Le, Zhao Tingfeng, Zou Yushi. Development practices of geology-engineering integration on upper sweet spots of Lucaogou Formation shale oil in Jimsar sag, Junggar Basin[J]. China Petroleum Exploration, 2019, 24(5): 679-690.

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