Evaluation and scale effect of aqeous phase damage in shale gas reservoir

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  • 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610500,China;
    2.Langfang Branch of Petroleum Exploration & Development Research Institute,PetroChina,Langfang 065007,China

Received date: 2016-07-25

  Revised date: 2016-08-21

  Online published: 2019-09-09

Abstract

Shale gas reservoir is characterized by nanometer-scaled pore-throats,ultra-low water saturation,high content of clay and some micro fractures.The key technology of shale gas development is hydraulic fracturing.The fracturing fluid remained in factures invades into shale matrix and causes aqueous phase trapping and water sensitivity damage which decrease gas relative permeability sharply.Shale reservoirs have a nano-Darcy permeability;therefore,it is difficult to evaluate formation damage by traditional methods which measure permeability before and after the interaction of fluids and core plugs.The paper conducted experiments of pressure depletion,spontaneous filtration imbibition and nitrogen displacement using shale outcrop samples from Sichuan and four types of fracturing fluid to evaluate the damage of fracturing fluid.The evaluation indexes of shale gas reservoir damage are analyzed,and it is considered that the traditional permeability recovery rate or permeability recovery rate cannot be the only index for evaluating the damage of shale gas reservoirs.Based on the evaluation results,the abnormal phenomenon of low displacement rate corresponding relatively high gas output is analyzed.And some conclusions are gained: aqueous phase trapping caused by fracturing fluid is a dynamic process;the positive effects for gas flow must be considered in the evaluation of aqueous phase trapping;flowback of fracturing fluid in shale gas is the key point in the future 5 to 10 years.

Cite this article

You Li-jun, Wang Fei, Kang Yi-li, Fang Chao-he, Chen Qiang . Evaluation and scale effect of aqeous phase damage in shale gas reservoir[J]. Natural Gas Geoscience, 2016 , 27(11) : 2023 -2029 . DOI: 10.11764/j.issn.1672-1926.2016.11.2023

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