Reservoir Damage Mechanism for Upper Wuerhe Formation in Southern Mahu Area, Junggar Basin

doi:10.7657/XJPG20220116

Abstract

Abstract:

The core of the conglomerate reservoir from upper Wuerhe formation of Permian is very easy to break after immersed in fluids, so that it is difficult to evaluate how gel-breaking fracturing fluid damages the reservoir, and it is impossible to determine the factors controlling reservoir damage in the southern Mahu area, Junggar basin. This study used X-ray Micro-CT technology to scan core samples and reconstructed the three-dimensional pore structure, and then characterized the pore changes on different sections by the ball-stick model and the threshold segmentation method. The results show that, after the reservoir was damaged by gel-breaking fracturing fluid, the average pore radius, average throat radius, average throat length, average pore-to-throat ratio, porosity and permeability were reduced by 42.1%, 32.7%, 19.1%, 45.3%, 7.7% and 33.8%, respectively. After fractured by gel-breaking fracturing fluid, the reservoir was damaged, resulting in reduced porosity and permeability, especially a significant change in permeability. Swelling montmorillonite in the clay minerals and particle migration are the factors that can cause damage to the reservoir, and the interaction between gel-breaking fracturing fluid and the reservoir is the primary factor causing reservoir damage.

Key words: Junggar basin, Mahu sag, southern Mahu area, Wellblock Mahu-1, upper Wuerhe formation, conglomerate, gel-breaking fracturing fluid, reservoir damage, clay mineral

CLC Number:

TE258

ZHOU Wei, SHEN Xiulun, KOU Gen, WEI Yun, JIANG Guancheng, YANG Lili, ZHANG Yuankai. Reservoir Damage Mechanism for Upper Wuerhe Formation in Southern Mahu Area, Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(1): 107-114.

Figures/Tables 8

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