Analysis of Influencing Factors on Water Cut in Heavy Oil Reservoir with Border Water at the Southern Block of Pai 6

Abstract

The southern block of Pai 6 belongs to a structural lithologic reservoir, with high crude oil viscosity and large difference on the plane. Because of thermal recovery development of horizontal wells, the initial daily oil production capacity is relatively high. The oil-gas ratio in the first cycle is 1.65, which gradually deteriorated from the second cycle. In the sixth cycle, the oil-gas ratio in the cycle drops to 0.74, mainly because the water cut in the southern well rises too fast. The rise of water cut is closely related to wellbore trajectory and crude oil viscosity, in addition to structural location. This paper focuses on the analysis of the factors affecting the water cut of oil wells in fault blocks and the law of water invasion by side water.

Copyright 2019, IFEDC Organizing Committee.

This paper was prepared for presentation at the 2019 International Field Exploration and Development Conference in Xi’an, China, 16–18 October, 2019.

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