Wellbore instability in naturally fractured formations: Experimental study and 3D numerical investigation

Li, Xiaorong; Yang, Henglin; Wei, Yaoran; Feng, Yongcun; Yang, Hao; Yan, Wei; Fu, Li

doi:10.1016/j.jgsce.2024.205265

Cited by 4 publications

(1 citation statement)

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“…Due to the highly developed, weak surface structures, such as the nanoscale microcracks and bedding planes in shale formations, as well as their strong water sensitivity, serious wellbore stability problems are prone to occur during long horizontal drilling [ 1 , 2 , 3 , 4 ]. In shale formations, their inherent porosity and permeability are both at extremely low levels.…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of the Shale Stratum Well Wall Stabilized with Nanosomal Sealing Agent

Li,

Gao,

Tang

et al. 2024

Polymers

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The development of micro cracks in shale formations can easily lead to wellbore instability caused by liquid phase invasion. In order to effectively seal the shale micropores, the surface treatment of nano-SiO2 particles was developed using the silicane coupling agent A-1891. Then, the temperature-sensitive polypenic acrylamide polymer was modified onto the surface of the nanoprocal particle through reaction to obtain the nanosomal blocking agent ASN. The infrared spectrum shows that there are chemical bonds between the generated polymer chains, rather than simple physical composites, indicating the successful synthesis of the temperature-responsive nanosealing agent ASN. The particle size analysis showed that the synthesized nanoparticles in ASN have a uniform particle size distribution and display no agglomeration phenomenon. Applying ASN as a sealing agent in drilling fluid effectively fills the nanoscale micropores and microcracks in shale, making shale denser and significantly improving the wellbore stability of shale formations. In addition, it has good temperature resistance, can adapt to reservoirs at different temperatures, is non-toxic and environmentally friendly, and has good prospects for stable applications in shale formation wellbore.

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Section: Introductionmentioning

confidence: 99%