Volume 39 Issue 6
Nov.  2022
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YANG Jun, JIANG Guancheng, WANG Guoshuai, et al.Development and evaluation of a self-crosslinking filter loss reducer for oil based drilling fluids[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：685-691 doi: 10.12358/j.issn.1001-5620.2022.06.004
Citation: YANG Jun, JIANG Guancheng, WANG Guoshuai, et al.Development and evaluation of a self-crosslinking filter loss reducer for oil based drilling fluids[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：685-691 doi: 10.12358/j.issn.1001-5620.2022.06.004
shu

Development and Evaluation of a Self-Crosslinking Filter Loss Reducer for Oil Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2022.06.004
  • 1.

    State Key Laboratory of Oil and Gas Resource and Prospecting, China University of Petroleum, Beijing 102249

  • 2.

    MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249

  • Received Date: 2022-08-05
  • Rev Recd Date: 2022-09-20
  • Publish Date: 2022-11-30
    Abstract
  • Conventional filter loss reducers for oil based drilling fluids have deficiencies such as low thermal stability and negative influence on mud rheology. To solve these problems, a new self-crosslinking filter loss reducer, BSN, for oil based drilling fluids was developed through emulsion polymerization with N-methylol acrylamide (a functional monomer), butyl acrylate and styrene. The main functional groups, micromorphology and self-crosslinking characteristics of BSN were characterized by infrared spectroscopy, laser particle size analyzer and transmission electron microscopy. It was found that BSN has self-crosslinking functional group of hydroxymethyl. The average particle size of BSN is 247 nm, and obvious particle-particle crosslinking structure can be seen. Thermalgravimetric test results have shown that BSN has good thermal stability, the initial decomposition temperature of which is 355 ℃, greatly higher than its non-self-crosslinking counterpart BS, which is 278 ℃. Addition of 1% BSN in an oil based drilling fluid not only had little effect on the rheology of the drilling fluid, but also improved the electrical stability of the drilling fluid. This oil based drilling fluid had HTHP filtration rate of only 4 mL, indicating that BSN was superior to BS and 3% other conventional filter loss reducers in controlling the filtration rate of oil based drilling fluids.

     

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