Application of multi-stage hydraulic fracturing of horizontal well in Halfaya Oilfield, Iraq

doi:10.3969/j.issn.1672-7703.2022.05.013

Abstract

Abstract: Sadi oil reservoir, an ultra-low to super-low permeability limestone oil reservoir in Halfaya Oilfield, has barely been developed due to the poor reservoir property. Based on mature experience, pilot Well S5H1 has been deployed to test the feasibility of developing this type of oil reservoir by multi-stage hydraulic fracturing in horizontal well, and the evaluation technology of double sweet spots (geological and engineering) has been researched. The combination of rock type classification and the comprehensive understanding of geological genesis facies and petrophysical facies enables to establish the evaluation technology for geological sweet spot, so as to optimally select the favorable area with the best reservoir property. While the brittleness index, Poisson’s ratio, Young’s modulus, minimum horizontal principal stress and fault toughness are comprehensively analyzed to identify the reservoir fracability in various zones, so as to determine the engineering sweet spot. The close integration of geological and engineering sweet spots supports to evaluate the oil reservoir in different levels and select the favorable exploration area, which ensures the successful implementation of the pilot well. The initial production and cumulative production in the first year from Well S5H1 were 4 and 2.3 times of those in vertical well after fracturing, which laid a foundation for the overall development of Sadi oil reservoir and provided a reference for the benefit utilization of the same type of reservoirs in the Middle East.

CLC Number:

TE243.2

Ma Yingzhe, Wei Guofeng, Fang Yuan. Application of multi-stage hydraulic fracturing of horizontal well in Halfaya Oilfield, Iraq[J]. China Petroleum Exploration, 2022, 27(5): 138-146.

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