Percolation Resistance Characteristics of Water Drive in Offshore Light Oil Reservoirs

doi:10.11885/j.issn.1674-5086.2019.02.27.02

Abstract

Abstract: In the water injection wells of light oil reservoirs, the wellhead pressure is constantly rising. Conventional measures such as acidification and microfracture cannot effectively reduce wellhead pressure. To explore the causes of injection pressure increases further, the law of variation in percolation resistance among wells is studied based on the flow tube and the principle of hydropower similarity. An expression of percolation resistance is derived by applying Darcy's Law. Percolation resistance is related to the shape of the reservoir and the total fluidity. The total fluidity change of the non-piston displacement process is usually divided into two types:monotonous increase (medium and high viscosity) and initial reduction followed by a slight increase (low stickiness). When the viscosity of crude oil is low, the total fluidity decreases, and the percolation resistance increases, resulting in increased injection pressure. In such circumstances, the wellhead pressure of the water injection well is increasing, and "pseudo-blocking" occurs, which substantially restricts the water injection. Through calculating the percolation resistance between injection and production wells in different oilfields of the southern Bohai Sea, a graph of the dimensionless resistance coefficient that reflects the law of variation in percolation resistance is obtained. The graph depicts the possible waterbearing stage of pseudo-blocking, which can effectively guide the management of the injection well. Combining this analysis with the treatment practice of the KL oilfield group, the following measures can be taken when pseudo-blocking occurs in the injection well:(1) Increase pressure and water injection for high fracture pressure and low fracture reservoirs. (2) Control the profile and oil displacement for low fracture pressure and high fracture reservoirs. (3) Develop gas drive systems for ultra-low crude oil viscosity and deeply buried reservoirs. (4) Give the vertical water drive contradiction priority for multilayer comingled mining development reservoirs.

Key words: pseudo-blocking, Darcy's Law, total fluidity, non-piston drive, in-situ gas generation

CLC Number:

TE53

CHEN Xiaoming, LIU Yingxian, WU Qiongyuan, LIU Chao, ZHAO Hanqing. Percolation Resistance Characteristics of Water Drive in Offshore Light Oil Reservoirs[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 101-110.

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