Volume 43 Issue 4
Jul.  2026
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Ouyang Jianglin, Zhang Ling, Yang Jianyu.Effects of oil-based drilling fluid components on performance of stator rubber in positive displacement motors[J]. Drilling Fluid & Completion Fluid，2026, 43（4）：498-505 doi: 10.12358/j.issn.1001-5620.2026.04.008
Citation: Ouyang Jianglin, Zhang Ling, Yang Jianyu.Effects of oil-based drilling fluid components on performance of stator rubber in positive displacement motors[J]. Drilling Fluid & Completion Fluid，2026, 43（4）：498-505 doi: 10.12358/j.issn.1001-5620.2026.04.008
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Effects of Oil-Based Drilling Fluid Components on Performance of Stator Rubber in Positive Displacement Motors

doi: 10.12358/j.issn.1001-5620.2026.04.008

  • Basic Technology Institute of Kingdream Public Limited Company, Wuhan, Hubei 430223

  • Received Date: 2026-02-09
  • Rev Recd Date: 2026-03-22
  • Publish Date: 2026-07-30
    Abstract
  • Oil-based drilling fluids are commonly used in drilling deep and ultra-deep wells. However, in many drilling companies and many wells in northwest China, the service life of oil- and high-temperature-resistant positive-displacement-motors (PDM) used in oil-based drilling fluids varies erratically, in some cases, rubber detachment even occurs after only a dozen hours of operation. In laboratory experiment, two types of PDM stator rubbers with different crosslinking densities were soaked in different oil-based drilling fluids to test their rates of volume change and hardness change. The experiment was conducted at different temperatures with the stator rubbers and the oil-based drilling fluids collected from different drilling companies. The experimental results show that number 0 diesel oil exerts very slight effect on stator rubber, and the higher the crosslinking density, the stronger its resistance to medium-induced swelling. Oil-based drilling fluid components of the same commercial name but from different manufacturers differs to some extent in their effect on the hardness and rate of volume change of the PDM stator rubber. The main components of the oil-based drilling fluid from the drilling company X have minor effect on the stator rubber, while the secondary emulsifier and the wetting agent from the drilling company Y exert significant impact. After hot rolling at 180 ℃ for 48 hours in the emulsifier from the drilling company Y, the rubber B experienced a rate of volume change of 42.94% and Shore A hardness change of −17.2 HA. Meanwhile, after hot rolling under the same conditions in the wetting agent, the rubber B experienced a rate of volume change of 27.06% and Shore A hardness change of −9 HA. The aniline point and thermal weight loss of the main components of an oil-based drilling fluid cannot be used as technical parameters affecting the swelling of the stator rubber. The results of Fourier transform infrared spectroscopy (FT-IR) and gas chromatography-mass spectrometry (GC-MS) analyses demonstrate that the amide components in the secondary emulsifier and the wetting agent from the drilling company Y are the main factors causing volume change of the PDM stator rubber. After removing the amide components from the oil-based drilling fluid, the problem of rubber detachment from PDMs was effectively addressed.

     

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