Production Mechanism of Mud and Sand in Ordovician Carbonate Reservoirs in Halahatang Oilfield, Tarim Basin

doi:10.7657/XJPG20220411

Abstract

Abstract:

In order to clarify the mechanism of wellbore instability in the Ordovician reservoirs of Halahatang oilfield, the rock, sand particle size and mineral composition of washed-out sand samples were mainly analyzed. It is found that wellbore instability in the Ordovician carbonate reservoirs in the study area occurs in two modes: (1) collapse of wellbore in the upper unplugged non-producing horizon (Tumuxiuke formation), that is, macroscopic instability, which results in collapsed rock blocks; and (2) production of sand carried by the fluids from key producing horizons, that is, microscopic instability, which causes the wellbore blockage by sand and mud generated from the cracking of fracture fillings and the exfoliated fine-grained components from micro-convex. The main controlling factors of wellbore instability were analyzed with the grey relational method, indicating that reservoir burial depth, wellbore diameter, water cut and wellbore azimuth are the main factors affecting wellbore instability. The wellbore diameter, wellbore azimuth and production system can be optimized to prevent and control the production of mud and sand.

Key words: Tarim basin, Halahatang oilfield, Ordovician, carbonate rock, reservoir, wellbore instability, wellbore blockage, instability control

CLC Number:

TE28

BAI Xiaofei, ZHOU Bo, DONG Changyin, WANG Fangzhi, LIU Xiao, GAN Lingyun, REN Jinming. Production Mechanism of Mud and Sand in Ordovician Carbonate Reservoirs in Halahatang Oilfield, Tarim Basin[J]. Xinjiang Petroleum Geology, 2022, 43(4): 456-462.

Figures/Tables 7

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