Volume 40 Issue 6
Dec.  2023
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JIANG Xu, LIU Huajie, MA Xiaolong, et al.A lost circulation control slurry with solidifying and bridging functions[J]. Drilling Fluid & Completion Fluid,2023, 40(6):798-805 doi: 10.12358/j.issn.1001-5620.2023.06.015
Citation: JIANG Xu, LIU Huajie, MA Xiaolong, et al.A lost circulation control slurry with solidifying and bridging functions[J]. Drilling Fluid & Completion Fluid,2023, 40(6):798-805 doi: 10.12358/j.issn.1001-5620.2023.06.015

A Lost Circulation Control Slurry with Solidifying and Bridging Functions

doi: 10.12358/j.issn.1001-5620.2023.06.015
  • Received Date: 2023-07-25
  • Rev Recd Date: 2023-09-01
  • Publish Date: 2023-12-30
  • Bridging lost circulation control slurries are difficult to be bonded with the walls of leaking channels during mud loss control, and are therefore generally squeezed back into the borehole. Thixotropic cement slurries as a kind of lost circulation material, have low fracture pressure, and are thus incapable of controlling severe mud losses. Based on the studies performed on the thixotropic cement slurries and bridging lost circulation control materials, the two kinds of lost circulation control materials are compounded together to form a new lost circulation control material with the advantages of both. By carefully selecting other additives, a new thixotropic cement slurry with good rheology and thixotropy is formulated. In the new cement slurry, the addition of a new thixotropic agent LTA-1 has only weak effect on the thickening time of the cement slurry, and LTA-1 can improve the compressive strength of the cement slurry. The composition of the bridging lost circulation control slurry is determined through “experiment on a slit”. Based on the requirement of thickening time and strength, the final composition of the lost circulation control slurry is determined to be thixotropic cement slurry∶bridging slurry = 2∶1. This lost circulation control slurry can be used to control mud losses through 3 – 5 mm artificial fractures simulating fractured formations and control mud losses through large pores simulated with 6 mm roller balls. The lost circulation control slurry can form a layer of barrier on the surface of the simulated formations with a pressure bearing capacity of greater than 14 MPa. The use with of this lost circulation control slurry satisfies the need of safe operations. The good thixotropy and lost circulation control capacity of this lost circulation control slurry are of great help to the control of mud losses in drilling complex formations.

     

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