Abstract
With the enhancement of environmental protection awareness, the requirements on drilling fluid are increasingly strict, and the use of ordinary oil-based drilling fluid has been strictly restricted. In order to solve the environmental protection and oil-gas reservoir protection problems of offshore oil drilling, a new synthetic basic drilling fluid system is developed. The basic formula is as follows: a basic fluid (80% Linear a-olefin + 20% Simulated seawater) + 2.5% nano organobentonite + 3.5% emulsifier RHJ-5# + 2.5% fluid loss agent SDJ-1 + 1.5% CaO + the right amount of oil wetting barite to adjust the density, and a multifunctional oil and gas formation protective agent YRZ has been developed. The performance was evaluated using a high-low-high-temperature rheometer, a high-temperature and high-pressure demulsification voltage tester, and a high-temperature and high-pressure dynamic fluid loss meter. The results show that the developed synthetic based drilling fluid has good rheological property, demulsification voltage ≥ 500 V, temperature resistance up to 160°C, high temperature and high pressure filtration loss < 3.5 mL. After adding 2% - 5% YRZ into the basic formula of synthetic based drilling fluid, the permeability recovery value exceeds 90% and the reservoir protection effect is excellent. The new synthetic deepwater drilling fluid is expected to have a good application prospect in offshore deepwater drilling.
Highlights
The results show that the developed synthetic based drilling fluid has good rheological property, demulsification voltage ≥ 500 V, temperature resistance up to 160 ̊C, high temperature and high pressure filtration loss < 3.5 mL
The rheology of the second-generation synthetic-based drilling fluid is greatly affected by temperature [9]
The viscosity of the drilling fluid is too high at low temperatures, and the viscosity of the drilling fluid is too low at high temperatures, especially the dynamic shear force is too low to carry the solid phase in the drilling fluid effectively [10]
Summary
The synthetic based fluid is biodegradable and has no pollution to the environment, so in the exploration and development of oil and gas fields in deep waters, the waste drilling fluid and produced drilling cuttings produced can be directly discharged into the ocean. It has good lubricating properties and suitable for drilling in well sections with high inclination and horizontal sections [1] [2]. The synthetic-based drilling fluid developed has good rheology, emulsification stability and temperature resistance, which meets the requirements of deep-sea drilling
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