Volume 39 Issue 4
Jul.  2022
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2022  >  39(4): 446-450
LI Ke, JIA Jianghong, YU Lei, et al.Mechanisms of lost circulation and technologies for mud loss prevention and control in shale oil drilling[J]. Drilling Fluid & Completion Fluid，2022, 39（4）：446-450 doi: 10.12358/j.issn.1001-5620.2022.04.008
Citation: LI Ke, JIA Jianghong, YU Lei, et al.Mechanisms of lost circulation and technologies for mud loss prevention and control in shale oil drilling[J]. Drilling Fluid & Completion Fluid，2022, 39（4）：446-450 doi: 10.12358/j.issn.1001-5620.2022.04.008
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Mechanisms of Lost Circulation and Technologies for Mud Loss Prevention and Control in Shale Oil Drilling

doi: 10.12358/j.issn.1001-5620.2022.04.008

  • Drilling Fluid Technology Service Center, Sinopec Shengli Oilfield Service Corporation, Dongying, Shandong, 257078

  • Received Date: 2022-03-15
  • Accepted Date: 2022-04-03
  • Rev Recd Date: 2022-04-01
  • Publish Date: 2022-07-30
    Abstract
  • Mechanisms of loss of oil based drilling fluids were analyzed taking the shale oil development in the Jiyang Depression as an example to solve the frequent occurrence of mud losses in shale oil development. The analytical results have shown that natural fractures are highly developed in shale oil reservoir formations, and this is one reason why the mud is easy to lose in shale oil drilling. The shales drilled are very brittle, and their surfaces are oil wet, pressure losses in long horizontal sections are therefore high, resulting in induced fractures into which the mud is lost. Lost circulation materials (LCM) in oil based drilling fluids have low friction coefficients, making it difficult to control the mud losses. Based on the studies on the mechanisms of mud losses occurred in shale oil drilling, a one-bag lost circulation material made from a surface-modified elastic mesh material and an optimized filling material. Laboratory long-fracture sealing and plugging experiment and field application have shown that the one-bag LCM has good sealing and plugging capacity; fractures of 2 mm × 1 mm has pressure bearing capacity of 10 MPa after being plugged with the LCM. Mud losses in field operations were brought under control in the first try of the LCM. The application of the one-bag LCM helped solve the losses of oil based drilling fluids in shale oil drilling, providing a technical support to the safe and fast drilling in shale oil reservoirs.

     

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