Prevention of water-blocking formation damage in gas reservoirs wettability alteration, analytical modelling
Document Type
Conference Proceeding
Publication Title
SPE Asia Pacific Oil & Gas Conference and Exhibition
Publisher
Society of Petroleum Engineers
School
School of Engineering
RAS ID
36507
Funders
Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology)
Abstract
Water blocking is a widespread formation damage mechanism in oil and gas reservoirs. The end effect on the well sand-face or fracture results in the creation of a water film which significantly reduces gas permeability. The removal of the water film by changing wettability near to the wellbore or hydraulic fracture is the traditional method of well stimulation. We describe inflow performance by two-phase steady-state flow towards well. The wettability affects the relative permeability and the capillary pressure. Treatment of the well neighbourhood by nanoparticles or surfactants results in a reservoir with non-uniform wettability. We present a steady-state solution for inflow performance and show how the alteration of the contact angle and the treatment depth affects the well productivity index. The model is verified by comparison with coreflood data. The developed analytical model can be used for the prediction of gas well productivity, and for the planning and design of wettability-alteration well-stimulation. The main result of the paper is the existence of the optimal contact angle.
DOI
10.2118/182283-ms
Access Rights
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Comments
Naik, S., You, Z., & Bedrikovetsky, P. (2016, October). Prevention of water-blocking formation damage in gas reservoirs wettability alteration, analytical modelling [Paper presentation]. SPE Asia Pacific Oil & Gas Conference and Exhibition, Perth, Western Australia, Australia. https://doi.org/10.2118/182283-ms