The aims of this study were to design a novel diversion acidizing stimulation treatment to remove formation damage and enhance gas production in a recently exploring ultradeep heterogeneous sandstone gas fields in TARIM, while avoiding formation collapse.

Although foam can be used to divert acid from the chief zones to the damaged zones, it is not available in this kind of ultradeep abnormally high pressure gas field and an additional handling equipment is required. In this paper a new diversion technique from both laboratory testing and field monitoring is discussed in detail. Laboratory testing conducted in a dual-core flow apparatus showed excellent diversion from a high-permeability formation to a low permeability one by using viscosity system. Field case histories in the heterogeneous gas formation in TARIM over past three years are presented. The field cases histories show the success of diversion acid technique and the improvement of gas production significantly.

Keywords:
drillstem testing, flow test, spe 80274, upstream oil & gas, diversion acid, gas production, fluid dynamics, heterogeneity, permeability value, drillstem/well testing
Subjects:
Reservoir Fluid Dynamics, Formation Evaluation & Management, Acidizing, Flow in porous media, Drillstem/well testing, Well Operations, Optimization and Stimulation
Copyright 2003, Society of Petroleum Engineers
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