Characteristics and Damage Prevention of Fault-Karst Reservoirs in Shunbei Oilfield

doi:10.7657/XJPG20210211

Abstract

Abstract:

The reservoirs in Shunbei oilfield are characterized by deep burial depth, developed fractures and strong heterogeneity. In order to ensure the safety of drilling, drilling operation at positive pressure difference is usually followed, however, the high-density drilling fluid used may damage the reservoir. After analyzing the lithology, reservoir space, surface wettability, sensitivity, rock mechanical characteristics and the drilling fluid system used in the reservoir interval, it’s found that the damage of the drilling fluid to the reservoir is mainly reflected in such aspects as a large amount of solid phase with low acid solubility invading the reservoir and blocking the fractures, large capillary force causing aqueous phase trapping and water lock in the gas layer, and the drilling fluid with poor temperature resistance causing settlement and excessively high positive pressure difference. In view of the tight matrix and strong heterogeneity of the reservoir in Shunbei Block 1, preventive measures to reduce reservoir damage are proposed, namely “physical plugging-filtrate surfactant control, and hydration inhibition-mechanical approximate balance”, to reduce fluid loss, decrease solid-phase invasion and depth, improve the plugging performance while drilling, and protect the reservoir.

Key words: Shunbei oilfield, fault-karst reservoir, strike-slip fault, reservoir damage, drilling fluid, damaged mode

CLC Number:

TE135.3

FANG Junwei, DONG Xiaoqiang, LI Xiong, ZHANG Guo, WU Xiongjun. Characteristics and Damage Prevention of Fault-Karst Reservoirs in Shunbei Oilfield[J]. Xinjiang Petroleum Geology, 2021, 42(2): 201-205.

Figures/Tables 7

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