Aqueous Trapping Damage Models for Fracture pore Tight Sandstone Gas Reservoirs
Received date: 2009-05-12
Revised date: 2009-07-14
Online published: 2009-10-10
Fracture-pore tight sandstone gas reservoirs are characterized by low porosity and permeability, high capillary pressure, fracture development, water wettability, and high irreducible water saturation. In the course of drilling, completion and development, filtrate intrusion would lead to water saturation increase and gas permeability decline near wellbore area, and result in aqueous trapping damage. Aiming at the geological characteristics, this paper studied different aqueous trapping damage models during drilling and development in fracture pore network system, and researched the aqueous trapping damage forming process and damage mechanism owing to operating fluid and edge and bottom water intruding into the matrix and fracture system. Then, it presented the measures to control aqueous trapping damage while drilling, completion, workover, production and development, such as temporary shielding techniques, underbalanced drilling, optimizing treatment fluid, enlarging flowback pressure difference, decreasing interfacial tension, evaporating or heating to reduce water saturation, drainage gas recovery, and equivalent development. With these treating, aqueous trapping damage can be effectively prevented.
ZHANG Feng-Dong, KANG Yi-Li, LIU Li-Jun, WANG Yong-Heng- . Aqueous Trapping Damage Models for Fracture pore Tight Sandstone Gas Reservoirs[J]. Natural Gas Geoscience, 2009 , 20(5) : 812 -816 . DOI: 10.11764/j.issn.1672-1926.2009.05.812
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