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< Natural Gas and Oil > Editorial Department
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Du Tonglin
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Tang Xiaoyong,Pu Liming
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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2014 Vol.2

    Analysis on Gas Well Dirt in Longgang Reef Reservoir and Study on its Blockage Mechanism
    Author of the article:Dong Zhengliang, Chen Dajun, Feng Danyang, Hou Xulin, Liu Danyu
    Author's Workplace：1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, 2. Sichuan Salt Geology Drilling Team, 3. Middle Sichuan Oil and Gas Field, PetroChina Southwest Oil and Gas Field Company
    Key Words：Longgang Reef Gas Reservoir; Blockage mechanism; Simulated well conditions; Microscope observation
    Abstract：
     In later stage of Sichuan Basin Longgang Reef Reservoir development, a large number of black solids and cream dirt appear and these solids and dirt block pipe strings and reservoirs, which results in sharp decrease of gas well production and shortening of acidification validity. Conducted is analysis on compositions of the blockages and blockage mechanism with the help of XRD diffractometer and analysis results show that underground solid particles, residual acid, oil soluble admixture and iron elements are the main factors resulting in blockage. Conducted is analysis on control variables of these factors in simulated well conditions and it is found out that in high temperature and high pressure conditions, oil soluble components in well-in fluid and such solid particles as carbon black and sulfur deposited in down hole produce high viscosity of emulsion under the action of emulsification and adsorption. Meanwhile, such high molecular polymer in well-in fluid admixture as reacted acid captures down hole solid particles under the action of adsorption bridge gels. The combination of the both results in a large number of black colloidal blockages. Hereby, put forward are proposal and measures for preventing and controlling blockages.

     


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