Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (5): 154-160.doi: 10.12108/yxyqc.20180519

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Mechanism and influencing factors of foam mixed flowback of sand production

JING Ziyan1, ZHANG Jia2, LI Guobin1, ZHU Biao3, HAN Guoqing2, LIU Shuangshuang4   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
    3. Production Optimization, China Oilfield Services Limited., Tianjin 300450, China;
    4. Schlumberger(Beijing), Beijing 100084, China
  • Received:2018-03-20 Revised:2018-05-19 Online:2018-09-14 Published:2018-09-14

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Abstract: With the increase of oil recovery,wellbore blockage in sandstone reservoir is becoming more and more serious. How to remove blockage and increase output has become a key issue of efficient development. From the angle of improving the permeability of oil layer to improve the production,many countries have generally adopted the methods of oil layer acidification and hydraulic fracturing to increase the oil recovery rate,but it also brings many negative problems,such as reservoir damage. Based on the mechanism of foam temporary support,state equation was used to deduce the change equation of formation pressure under the condition of foam compressibility,and study the influence of the main formation conditions and construction parameters under the condition of foam compressi-bility by combining the physical simulation experiment. The results show that gas liquid ratio, fracture,porosity and pressure drop are the main factors that affect the sand carrying capacity and the discharge of fine sand. This study can provide a theoretical and technical guidance for improving foam mixed flowback theoretical model and practical construction,and can help to improve single well recovery.

Key words: foam mixed flowback, mechanism research, simulation experiment, influencing factors, recovery ratio

CLC Number: 

  • TE358.1
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