Volume 39 Issue 3
May  2022
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TENG Chunming, ZHEN Jianwu, LUO Huiyi, et al.A strongly adsorptive hydrophobically modified nano SiO2 plugging agent[J]. Drilling Fluid & Completion Fluid,2022, 39(3):307-312 doi: 10.12358/j.issn.1001-5620.2022.03.007
Citation: TENG Chunming, ZHEN Jianwu, LUO Huiyi, et al.A strongly adsorptive hydrophobically modified nano SiO2 plugging agent[J]. Drilling Fluid & Completion Fluid,2022, 39(3):307-312 doi: 10.12358/j.issn.1001-5620.2022.03.007

A Strongly Adsorptive Hydrophobically Modified Nano SiO2 Plugging Agent

doi: 10.12358/j.issn.1001-5620.2022.03.007
  • Received Date: 2021-12-23
  • Rev Recd Date: 2022-02-01
  • Available Online: 2022-08-10
  • Publish Date: 2022-05-30
  • Downhole troubles such as borehole instability and mud losses are frequently encountered when drilling formations with poor stability and low pressure bearing capacity. Study and evaluation of new nano plugging agents have recently been performed to solve these problems. Study on these issues gave birth to a strongly adsorptive hydrophobic nano plugging agent. Measurement of the particle size distribution, adsorptive ability and wettability of the plugging agent, as well as plugging capacity test performed on sand-bed have shown that the particle sizes of the plugging agent was distributed in a range of 100-150 nm. The plugging agent has good adsorptive ability; it can increase the contact angle of water on the surfaces of shale to 80.7°. A mud sample treated with 2.5% of the plugging agent had its filtration rate through a sand-bed tester reduced to 5.0 mL. The plugging agent has little, if any, effect on the rheology of the drilling fluid. The API filtration rate of the drilling fluid was reduced by the plugging agent from 4.4 mL to 1.0 mL, and the HTHP filtration rate was reduced from 16.2 mL to 6.2 mL. At concentrations in a mud above 3.0%, the permeability of the mud cakes was reduced to 2.8 μD. PPA plugging efficiency test has shown that the plugging agent can form a plugging layer on a ceramic filter disk, the filtration rate was reduced to 0.45 mL/min1/2, and the spurt loss was reduced to 2.58 mL. The study has demonstrated that the strongly adsorptive hydrophobic nano plugging agent can enhance the plugging capacity of the drilling fluid, reduce the amount of filtrate invasion of the drilling fluid into the formation and effectively help stabilize the borehole wall.

     

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