Research on Environmentally Friendly Palm Oil Based Drilling Fluid
In response to the shortcomings of poor environmental friendliness and high disposal cost of existing oil-based drilling fluids,an environmentally friendly palm oil based drilling fluid system is proposed using palm oil as the base oil.Through gas chromatography-mass spectrometry(GC-MS)analysis,it was found that the main components of palm oil are octadecanoic acid and myristic acid.A filter loss agent with good compatibility with palm oil was synthesized by grafting octadecylamine onto natural material humic acid as raw material.The struc-ture characterization,thermogravimetric analysis,and scanning electron microscopy analysis of the synthesized fil-ter loss agent were carried out.The key treatment agents such as organic soil and emulsifier were optimized to form a palm oil based drilling fluid system with a formula of palm oil+20％CaCl2+3％organic soil+3％emulsifi-er+3％filter loss reducer+1％wetting agent+1％CaO+barite.The basic performance,anti pollution performance,and environmental performance of palm oil based drilling fluid were evaluated.The results showed that the palm oil based drilling fluid system had a demulsification voltage of over 800 V before and after aging at 120 ℃,a high temperature and high pressure filtration loss of less than 5 mL,and moderate viscosity and shear force.Through anti pollution experiments,it was verified that the system had good resistance to NaCl,rock cuttings pollution.The biological toxicity EC50 value of the system was tested to be 104 000 mg/L,and the BOD5/CODCr value of the leachate was 24.5％.It has the advantages of low biological toxicity and easy degradation,and can meet the re-quirements of drilling fluid in areas with high environmental protection requirements.
palm oiloil based drilling fluidhumic acidfilter loss reducing agent
万方数据
维普
