Study on Characteristics of Remaining Oil Distribution and Countermeasures for Potential Tapping in Well Block Xiayan 11

doi:10.3969/j.issn.1006-6535.2022.04.016

Abstract

Abstract: In response to the problems of strong intra- and inter-reservoir heterogeneity, continuous decrease in production, unclear pattern of remaining oil distribution after development with water flooding, and poor capability of sustainable and stable production in Well Block Xiayan 11, Xinjiang Oilfield, the distribution pattern of different types of remaining oil in highly heterogeneous reservoir was studied by numerical simulation, reservoir engineering methods and dynamic monitoring, and countermeasures for further potential tapping were defined. The results of the study showed that, there were three types of remaining oil potential tapping areas in Well Block Xiayan 11, specifically, type Ⅰ was the remaining oil controlled by the imperfect injection-production well pattern, featured by high remaining oil saturation (more than 45% on average) and reservoir thickness of no less than 4.5 m and mainly developed with underwater distributary channels, and the potential tapping countermeasure was to improve the physical properties of low-permeability areas by reservoir stimulation; type Ⅱ was remaining oil restricted between wells, featured by high remaining oil saturation (20% to 45% on average) and reservoir thickness of 3.0 to 4.5 m and mainly developed with estuary dams, and the potential tapping countermeasure was to re-perforate the oil-water wells and improve the injection-production well pattern; type Ⅲ was remaining oil with high flooding level, and featured by low remaining oil saturation (less than 20% on average), reservoir thickness of no more than 2 m and scattered remaining oil distribution, and the potential tapping countermeasures included re-perforation of old wells, separate injection of water wells, profile control of water injection wells, and repeated fracturing and re-perforation of low-production wells. The study provides a reference for the development of similar heterogeneous reservoirs.

Key words: residual oil, injection-production well pattern, development adjustment, heterogeneity, potential tapping strategy, Xinjiang Oilfield

CLC Number:

TE327

Duan Bolong, Li Yaoyin, Sun Zhixiong, Chang Zhiyong, Dang Sisi, Ma Yanqing. Study on Characteristics of Remaining Oil Distribution and Countermeasures for Potential Tapping in Well Block Xiayan 11[J]. Special Oil & Gas Reservoirs, 2022, 29(4): 114-119.

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