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XIAO Fengfeng, YANG Lili, WU Jiale, et al.Castor oil-based environmentally friendly waterborne polyurethane film-forming agent CWPU[J]. Drilling Fluid & Completion Fluid，2025, 42（2）：201-208 doi: 10.12358/j.issn.1001-5620.2025.02.007
Citation: XIAO Fengfeng, YANG Lili, WU Jiale, et al.Castor oil-based environmentally friendly waterborne polyurethane film-forming agent CWPU[J]. Drilling Fluid & Completion Fluid，2025, 42（2）：201-208 doi: 10.12358/j.issn.1001-5620.2025.02.007
shu

Castor Oil-Based Environmentally Friendly Waterborne Polyurethane Filming Agent CWPU

doi: 10.12358/j.issn.1001-5620.2025.02.007
  • 1.

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

  • 2.

    CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu 610051

  • Received Date: 2024-09-23
  • Rev Recd Date: 2024-11-15
    • Available Online: 2025-02-14
    Abstract
  • In the exploration of oil and gas resources, low-permeability oil and gas reservoirs are easily damaged and are difficult to recover. This problem has become more and more serious. The development of filming agents can help solve this problem, however, the raw materials currently used for the synthesis of filming agents are generally petroleum products, which is harmful to environmental protection. As an inexpensive and easily available biomass resource, castor oil is a vegetable oil that exists in nature, with hydroxyl groups in its molecular structure that do not need modification. It also contains a variety of active chemical bonds and can be used to prepare various high-efficiency additives. Isophorone and a chain extender were introduced onto the castor oil molecules to prepare an environmentally friendly waterborne polyurethane filming agent CWPU-1. The particle sizes of this modified product are distributed mainly between 40 nm and 200 nm, and the particles can cover the micro-nano pores and fractures. Observation with AFM shows that the microscopic surfaces of the CWPU-1 particles are continuous and smooth, indicating that CWPU-1 can form a film through adsorption, hydrophobic association and electro-neutralization. This film makes the mud cake more compact and reduces the filtration rate of the drilling fluid. The reduction rates of the filtration at room temperature and after aging at 150℃ for 16 hours can reach 64.7% and 61.1% respectively. The inhibitive property was evaluated with small clay balls. The results show that after being soaked in the drilling fluid treated with CWPU-1 for 6 hours, the mass reduction rate of the clay balls can reach 46%, meaning that the water absorption swelling of the clay balls is inhibited. After being tested with the formation water in a certain area, CWPU-1 does not produce scale. It is thus concluded that CWPU-1 has a good effect on preventing the invasion of drilling fluids and protecting reservoirs from being damaged.

     

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