Volume 37 Issue 2
Apr.  2020
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2020  >  37(2): 185-191
WANG Xiuying, WU Tong, CAI Jun, XIONG Zhan, GUO Guangfeng, ZHANG Ming. Patterns of Stress Sensitivity of the Shale Oil Reservoirs in Raoyang Depression[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 185-191. doi: 10.3969/j.issn.1001-5620.2020.02.009
Citation: WANG Xiuying, WU Tong, CAI Jun, XIONG Zhan, GUO Guangfeng, ZHANG Ming. Patterns of Stress Sensitivity of the Shale Oil Reservoirs in Raoyang Depression[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 185-191. doi: 10.3969/j.issn.1001-5620.2020.02.009
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Patterns of Stress Sensitivity of the Shale Oil Reservoirs in Raoyang Depression

doi: 10.3969/j.issn.1001-5620.2020.02.009

  • 1. Engineering Technology Research Institute of Huabei Oilfield Company, Renqiu, Hebei 062550;

  • 2. China University of Petroleum, Beijing 102249;

  • 3. Exploration Department of Huabei Oilfield Company, Renqiu, Hebei 062550;

  • 4. The Second Drilling Company, BHDC, Langfang, HEbei 065000;

  • 5. Drilling Orientation Engineering Office of Inner Mongolia Coal Construction Engineering Corporation, Hohhot, Inner Mongolia 010020;

  • 6. Huabei Oilfield Company First Oil Production Plant, Renqiu, Hebei 062550

  • Received Date: 2019-11-27
  • Publish Date: 2020-04-28
    Abstract
  • The Raoyang depression is enriched with abundant shale oil. It is well known that shale formations are generally developed with stress sensitivity, therefore the degree of stress sensitivity in this area should be measured and patterns of stress sensitivity be found to provide basic data for field production. Eleven sets of experiments on the mineral composition, microstructure and connectivity of the reservoir formations, and three sets of flow experiments on reservoir stress sensitivity were conducted using XRD whole mineral analyses, fluorescent thin layer analyses and SEM. At permeability loss of 20%, the stress sensitivity patterns of the Raoyang depression was obtained with data fitting. The relationship between net stress, clay content and brittle mineral content is this:-0.09796mc+0.2385mb-7.8145. The relationship between irreversible permeability loss, clay content and brittle mineral content is this:93.24+0.2797mc-0.6809mb. The percent irreversible permeability loss is 52.09% and the net stress corresponding to permeability loss of 20% is within 3 MPa. Further analyses showed that different opening sizes of the micro fractures resulted from different clay contents are responsible for the relationships, the content of brittle minerals decides the irreversible permeability impairment and the net stress corresponding to 20% of permeability loss. The experimental results showed that stress sensitivity in the shale oil reservoirs in Raoyang depression is negatively correlated to the content of clay content, and is positively corelated to the content of brittle minerals. When the amount of reservoir rock samples is not enough to characterize the patterns of the whole formation, the data fitting method described in this study provides a way of using limited core plugs to realize the goal of whole formation characterization.

     

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