Numerical Simulation on Upgrading and Dilation of SAGD Ultra-Heavy Oil Reservoirs With High Heterogeneity

doi:10.7657/XJPG20230211

Abstract

Abstract:

The ultra-heavy oil reservoirs in Fengcheng oilfield of Xinjiang belong to continental braided river deposits，with high heterogeneity. The SAGD well group in the oilfield has problems such as long preheating period and uneven development of steam chambers. The initial reservoir dilation test can significantly improve steam injection capacity and shorten preheating period，but lacks the whole-process rock mechanics coupling analysis on reservoir dilation，which is not conducive to the optimal design of the parameters for SAGD reservoir upgrading and dilation. Based on laboratory experiments such as rock triaxial compression test，the rock mechanical parameters of highly heterogeneous reservoirs were obtained，and a numerical model of SAGD dilation and thermal production for dual horizontal wells coupled with rock mechanics was established to analyze the factors influencing reservoir upgrading and dilation. Through the hierarchical and segmented dilation simulation for the highly heterogeneous reservoirs，it is clear that the reservoir upgrading and dilation should include five stages，that is，wellbore pore-pressure pretreatment stage，stress dilation stage of steam injector and its branches，large-volume dilation stage of steam injector and its branches，steam injector and producer connection stage，and above-injector large-volume dilation stage. An upgrading and dilation strategy represented by segmental dilation of fishbone well was formed for highly heterogeneous reservoirs. Field application has shown that the proposed reservoir upgrading and dilation technology is suitable for highly heterogeneous reservoirs. The technology can shorten the preheating period by 50% and increase the oil production rate by 20%. It provides a reference for the optimal design of parameters for SAGD upgrading and dilation in highly heterogeneous reservoirs.

Key words: Fengcheng oilfield, ultra-heavy oil reservoir, SAGD, highly heterogeneous reservoir, upgrading and dilation, rock mechanics, numerical simulation, segmented dilation

CLC Number:

TE345

MENG Xiangbing, SUN Xinge, LUO Chihui, MA Hong, WANG Qing. Numerical Simulation on Upgrading and Dilation of SAGD Ultra-Heavy Oil Reservoirs With High Heterogeneity[J]. Xinjiang Petroleum Geology, 2023, 44(2): 210-216.

Figures/Tables 6

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