Exploration and practice of volume fracturing technology in horizontal well of Mahu tight conglomerate reservoirs

doi:10.3969/j.issn.1672-7703.2019.02.013

Abstract

Abstract: Mahu tight conglomerate reservoirs have huge potential of tight oil resource and exploitation. Based on the complex reservoir-forming conditions, poor reservoirs property, strong heterogeneity and large sand body span, hydraulic fracturing in this area was facing serious challenges in fracture initiation and proppant placement. Annual production capacity of fractured wells were under expectation. According to the concept of "fracture-controlled reserves", series technologies of subdivision volume fracturing are integrated after 5 years of exploration. High-efficiency initiation and extension of multi-cluster fractures in one section are achieved by using drillability bridge plug segmented, small crack spacing cluster perforation and large displacement inverse mixing injection technologies. The effect of proppant placement and reservoir pressure are improved through multi-scale proppant adding method and increasing the dosage of slippery water to replace the guar gum. The series technologies have been widely applied in 11 blocks and 86 wells in Mahu, including exploration, evaluation and development area. For tight oil reservoir, the fracturing and producing effects have improved and economic development has been realized. Then, development of the total Mahu oilfield is effectively promoted.

Key words: Mahu oilfield, tight conglomerate reservoirs, horizontal well, subdivision volume fracturing technology

CLC Number:

Xu Jiangwen, Li Jianmin, Wu Yuanyue, Ding Kun, Jiang Hong. Exploration and practice of volume fracturing technology in horizontal well of Mahu tight conglomerate reservoirs[J]. China Petroleum Exploration, 2019, 24(2): 241-249.

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