Preparation method of inert dilution agent for oil-based drilling fluid

Abstract

The invention relates to a preparation method of an inert dilution agent for an oil-based drilling fluid. According to the technical scheme, the preparation method comprises the following steps that 1, low-viscosity synthetic base oil is added in a beaker with a stirrer and a thermometer, and a reaction is carried out at the 50-90 DEG C for 3-6 hours, and then heating is stopped; 2, an emulsifyingagent is added into the reactor in the step 1, and stirring is conducted 3-6 hours; 3, a filtrate reducer, a wetting agent, an alkalinity regulating agent and a calcium chloride water solution are mixed in a ratio and then added into the reactor in the step 1, and stirring is conducted for 6-8 hours; 4, the mixture in the reactor is stirred at a high speed, a reaction is carried out at the temperature of 50-90 DEG C for 3-6 hours, cooling is conducted until to the room temperature, an emulsion is formed, and the emulsion is the inert dilution agent for the oil-based drilling fluid. The preparation method has the advantages that under the condition that the inhibitive ability and the shear thinning performance of the oil-based drilling fluid are not changed, the plastic viscosity can be reduced, and the drilling fluid obtained before and after addition of the inert dilution agent cannot affect construction safety even in the construction process.

Description

technical field [0001] The invention relates to the preparation of a stable emulsion of drilling fluid particles, in particular to a preparation method of an inert diluent for oil-based drilling fluid. Background technique [0002] The oil-based drilling fluid system has strong shale inhibition ability, lubricity and anti-pollution ability, and is suitable for the development and application of difficult wells, but the high gas cost is not conducive to its promotion. In order to reduce costs, oil-based drilling fluids are usually Reuse after recovery. After repeated use of oil-based drilling fluid, due to the accumulation of solid phase in the drilling fluid and other reasons, the drilling fluid thickens seriously and the inhibition decreases. If you want to continue to use it, you must carry out viscosity reduction treatment. [0003] Viscosity-reducing means mainly remove solid phase by physical means and use continuous-phase base oil to reduce its viscosity. The viscosity...

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Problems solved by technology

[0002] The oil-based drilling fluid system has strong shale inhibition ability, lubricity and anti-pollution ability, and is suitable for the development and application of difficult wells, but the high gas cost is not conducive to its promotion. In order to reduce costs, oil-based drilling fluids are usually Reuse after recovery. After repeated use of oil-based drilling fluid, due to the accumulation of solid phase in the drilling fluid and other reasons, the drilling fluid thickens seriously and the inhibition decreases. If you want to continue to use it, you must carry out viscosity reduction treatment.

[0003] Viscosity-reducing means mainly remove solid phase by physical means and use continuous-phase base oil to reduce its viscosity. The viscosity-reducing effect is not obvious, and the performance of oil-based drilling fluid will be destroyed after adding, making it shear-thinning, inhibiting If thickening occurs during the construction process, adding base oil will lead to performance changes and increase the risk of construction. Therefore, the existing technology cannot reduce the viscosity at the construction site, but transports it to the slurry mixing station for processing, which reduces the cost. greatly increased, so it is necessary to develop a diluent that can be used in the construction process to cooperate with the equipment

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