西南石油大学学报(自然科学版) ›› 2008, Vol. 29 ›› Issue (4): 111-114.DOI: 10.3863/j.issn.1000-

• 石油与天然气工程 • Previous Articles     Next Articles

PROPPANT FLOW BACK THEORY AND APPLICATION DURING FORCED FRACTURING FLUID FLOWBACK

HU Jing-hong1 HE Shun-li1 LI Yong-ming2 ZHAO Jin-zhou2 LIU Guang-feng1

  

  1. 1.MOE Key Laboratory of Petroleum Engineering，China University of Petroleum，Changping Beijing 102249，China；2.The State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu Sichuan 610500，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-08-20 Published:2008-08-20

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Abstract:

To lowpermeability reservoirs，forced flowback technology is usually adopted after fracturing operation.Whether proppant flows back or not is the key evaluation criteria to forced flowback.The motion and start model is presented in the paper，which is based on the analysis of physical process of proppant backflow and the force on the last injected proppant.The calculation result shows that the last injected proppant stop immediately near fracture mouth and whether the proppant flow back or not is depended on flow velocity of fracturing fluid.Beginning with small choke and changing a bigger choke latter during forced flowback is not only discharge fracturing fluid in time but also can avoid proppant backflow.The results provide theoretical support to quantitative analysis of proppant flowback and optimize the flowback technology.

Key words: forced flowback, proppant back flow, motion model, start model, critical flow velocity

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