Volume 37 Issue 5
Oct.  2020
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2020  >  37(5): 631-637
JIA Jun, CHEN Lei, ZHANG Liang. Study on and Application of Drilling Fluids Formulated with Fracturing Flowback Fluids in Longdong, Changqing Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 631-637. doi: 10.3969/j.issn.1001-5620.2020.05.016
Citation: JIA Jun, CHEN Lei, ZHANG Liang. Study on and Application of Drilling Fluids Formulated with Fracturing Flowback Fluids in Longdong, Changqing Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 631-637. doi: 10.3969/j.issn.1001-5620.2020.05.016
shu

Study on and Application of Drilling Fluids Formulated with Fracturing Flowback Fluids in Longdong, Changqing Oilfield

doi: 10.3969/j.issn.1001-5620.2020.05.016

  • 1. National Engineering Laboratory for Low-Permeability Oil-Gas Field Exploration and Development Drilling, Xi'an, Shaanxi 710021;

  • 2. Production Engineering Technology Institute of CCDC, Xi'an, Shaanxi 710018;

  • 3. Chuanqing Drilling Engineering Co., Ltd. Changqing Drilling Corporation, Xi'an, Shaanxi 710018

  • Received Date: 2020-04-11
  • Publish Date: 2020-10-28
    Abstract
  • Fracturing operation in Longdong, Changqing Oilfield produced very large amount of fracturing flowback fluids which were seldom reused because of technical obstacles. To minimize the amount of the fracturing flowback fluids discarded as waste fluid and to turn them into useful resources, four typical fracturing flowback fluid samples taken from oil wells in Longdong were studied for their basic properties, ionic composition, biochemical specification and foaming performance to determine the major factors affecting the formulation of a drilling fluid with the fracturing flowback fluids. Based on the affecting factors determined, desanders, biocides, foaming inhibitors and ion removers for the preprocessing of the fracturing flowback fluids were selected and evaluated. A preprocessing technical procedure for preprocessing the fracturing flowback fluids was developed, taking into account the field practice prevailing in Changqing Oilfield. As a pilot test, fracturing flowback fluids produced from two wells on the horizontal well platform Hua-H20-* in Longdong area (a block with tight oil reservoir) where water shortage has long been a problem were preprocessed and then used to formulate a drilling fluid. The results of the pilot test showed that the properties of the drilling fluid formulated were very close to the properties of the drilling fluids formulated with makeup water; the density of the drilling fluids formulated was 1.25-1.30 g/cm3, and the rate of loss of apparent viscosity was less than 15.0%. Borehole wall was stable in the sections drilled with the drilling fluid formulated with the fracturing flowback fluids, and the drilling fluid had filtration rate and foaming performance that were well under control, highly satisfying the needs of the drilling operation. This study has laid the foundation for formulating drilling fluids with fracturing flowback fluids and maximizing the overall utilization of water resource.

     

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