Volume 40 Issue 4
Jul.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(4): 453-461
GAO Chongyang, HUANG Xianbin, BAI Yingrui, et al.Development of ultra-high temperature polymer brush lubricant for water based drilling fluids[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：453-461 doi: 10.12358/j.issn.1001-5620.2023.04.006
Citation: GAO Chongyang, HUANG Xianbin, BAI Yingrui, et al.Development of ultra-high temperature polymer brush lubricant for water based drilling fluids[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：453-461 doi: 10.12358/j.issn.1001-5620.2023.04.006
shu

Development of Ultra-high Temperature Polymer Brush Lubricant for Water Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2023.04.006
  • 1.

    Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao，Shandong 266580

  • 2.

    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao，Shandong 266580

  • 3.

    PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000

  • Received Date: 2023-03-10
  • Accepted Date: 2023-05-10
  • Rev Recd Date: 2023-04-06
  • Publish Date: 2023-07-30
    Abstract
  • During oil and gas drilling in deep complex formations, the technical requirements of high temperature and salt-resistance of drilling fluid should be met. In this paper, a polymer brush lubricant (HLM) for water-based drilling fluids was prepared using methyl methacrylate, lauryl acrylate and 2-hydroxyethyl acrylate as the main raw materials and 2-methylpropionitrile as the initiator. The HLM was characterized by means of Fourier infrared spectroscopy, nuclear magnetic resonance spectroscopy, thermogravimetric analysis and gel chromatography. The compatibility of HLM with drilling fluids and the lubricity performance of HLM under high temperature, high salt and high density conditions were evaluated. The lubricity was further analyzed using a multifunctional material surface performance tester and a four-ball friction tester. The experimental results showed that HLM had a good thermal stability with a weight average molecular mass of 3494. HLM had good compatibility with the bentonite-based mud at room temperature and had essentially no effect on rheology. The temperature resistance can reach 260 ℃.When concentration of HLM was 2%, the lubrication coefficient reduction rates were 91.16% under room temperature, 88.24% after ageing at 260 ℃, 75.69% for the saturated salt-based mud, and larger than 40% in the high-density drilling mud. The multifunctional material surface performance experiment further demonstrated that HLM could substantially reduce metal-to-metal friction. The four-ball friction experiment demonstrated that HLM could form a stable lubricating film on metal surfaces. Since HLM had multiple adsorption sites and strong adsorption capacity, the adsorption film still had high strength under high temperature and high salt conditions, giving HLM good lubricating properties. This paper can provide technical reference for the construction of drilling fluids for deep/ultra-deep formations.

     

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