Volume 34 Issue 5
Sep.  2017
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2017  >  34(5): 123-128
LIU Changlong, ZHANG Liping, LAN Xitang, MENG Xianghai, ZOU Jian, FU Yangyang, ZHANG Lu. Flow Back or Not after Well Completion: Comparison of Their Impact on Formation Damage in Different[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(5): 123-128. doi: 10.3969/j.issn.1001-5620.2017.05.023
Citation: LIU Changlong, ZHANG Liping, LAN Xitang, MENG Xianghai, ZOU Jian, FU Yangyang, ZHANG Lu. Flow Back or Not after Well Completion: Comparison of Their Impact on Formation Damage in Different[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(5): 123-128. doi: 10.3969/j.issn.1001-5620.2017.05.023
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Flow Back or Not after Well Completion: Comparison of Their Impact on Formation Damage in Different

doi: 10.3969/j.issn.1001-5620.2017.05.023

  • 1. Tianjin Branch of CNOOC Ltd, Tianjin 300452;

  • 2. State Key Laboratory of Offshore Oil Exploitation, Tianjin 300452

  • Received Date: 2017-07-02
  • Publish Date: 2017-09-30
    Abstract
  • Bohai oilfield has long been developed with water injection. Some water injectors are directly put into injection without flowback because of special environmental requirements and time limit, resulting in high injection pressure and deficiency in injection rate. A study has been conducted to resolve this problem, focusing on whether a well was flowed back or not in the early stage. Differences between formation damage caused by the two operations (flow back or not flow back) were extensively analyzed from the types of formation damage and formation damage mechanisms. Extent of formation damage and effects of formation damage by drilling fluid on water injection in late stage were studied. The study showed that drilling and completion fluids caused formation damage in two ways, retention and adsorption of chemicals. Formation damage caused by retention is a reversible process and can to some extent be relieved, formation damage caused by adsorption, on the other hand, is an irreversible process. Laboratory experiments showed that well flowback greatly reduces permeability impairment by drilling and completion fluids. Formation damage caused by drilling and completion fluids is not just a decrease in permeability by retention and adsorption; it also is concerned with the alteration of the properties of rock surfaces which in turn affects water injection in late stage.

     

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