Environment friendly synthetic base drilling fluid

Abstract

The invention provides an environment friendly synthetic base drilling fluid including: 65-80 v% of linear paraffin synthetic base oil, 20-35 v% of a calcium chloride water solution being 25 mass%, 2-3 mass% of NHY-1 organic earth, 1-6 mass% of natural fatty acid, natural fatty amine, natural tall oil fatty acid and an alkyl ether emulsifier, 1-4 mass% of calcium oxide, 1-5 mass% of a high-molecular polymer D210 fluid loss additive, and 20-80 mass% of a barite powder weighting agent.

Description

Technical field [0001] The invention relates to a drilling fluid, specifically, an environmentally friendly synthetic base drilling fluid. Background technique [0002] Oil-based drilling fluids have been used for drilling for oil and gas resources for decades. The original base oils used, such as crude oil and diesel, are toxic and have low biodegradability, which is obviously unsatisfactory in terms of environmental protection and safety. Especially in offshore drilling, the cuttings wrapped in oil-based drilling fluid will inevitably bring adverse effects to marine life when they are discharged into the seabed. At present, the use of more white oil has improved the toxicity problem and better met the needs of offshore drilling engineering, but still has a high kinematic viscosity. The rheological properties of the drilling fluid system formulated with white oil as the base oil are still unstable. Especially in the case of the average 3.8°C on the seafloor, the apparent viscos...

AI Technical Summary

Problems solved by technology

Synthetic-based drilling fluid can solve the problem that water-based drilling fluid cannot meet the performance requirements of downhole complex conditions, and oil-based drilling fluid and white oil-based drilling fluid cannot meet the requirements of environmental protection

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