A kind of double continuous phase microemulsion, its preparation method and the drilling fluid containing the microemulsion and its preparation method

Abstract

The invention provides a bicontinuous phase micro-emulsion which comprises an emulsifier, a water soluble acid, an oil phase and a water phase. The emulsifier is an amine nonionic emulsifier. The invention further discloses a drilling fluid containing the micro-emulsion. The drilling fluid comprises the micro-emulsion, an oil base stabilizer, organic soil and a weighing material. The invention further discloses a preparation method of the micro-emulsion and the drilling fluid. The method comprises the steps that other raw materials are mixed, the water soluble acid is added for induction to obtain the bicontinuous phase micro-emulsion and the drilling fluid, or the other raw materials and the water soluble acid are mixed at first to obtain the bicontinuous phase micro-emulsion, a drillingfluid additive is added, and the bicontinuous drilling fluid is obtained. The bicontinuous phase micro-emulsion has the advantages that the unique oil phase and water phase bicontinuous characteristics, high shearing force, low plastic viscosity and viscoelasticity rheologic characteristics are achieved, the advantages of the oil phase and water phase drilling fluids can be shown at the same timewhen the micro-emulsion is used for the drilling fluid, and the water power transmission, suspension, rock debris carrying and well cleaning capability of the drilling fluid are enhanced.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry and colloid technology, in particular to a dual continuous phase microemulsion, a preparation method thereof, a drilling fluid containing the microemulsion and a preparation method thereof. Background technique [0002] During the drilling process, the drilling fluid reaches the formation through the drill string, then is sprayed out by the drill bit into the annular space between the drill string and the well wall, and finally returns to the ground. During this process, the drilling fluid mainly provides the functions of suspending and carrying cuttings, balancing formation pressure and stabilizing the well wall, cooling and lubricating the drill bit and drilling tools, transmitting hydrodynamic force, etc., and minimizing the impact on oil and gas reservoirs and the ecological environment, etc. , Therefore, the drilling fluid is called the blood of drilling. [0003] In the prior art, commonly...

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Problems solved by technology

[0004] In order to solve the problem that even if the most advanced reversible emulsified drilling fluid is used in the prior art, it still needs to add special chemical additives to modify it, and special equipment is needed to solve the problem of temperature control, speed control and anti-corrosion of the acid liquid delivery system. For the problems of increased cost, complicated procedures, and increased environmental pollution, the present invention provides a dual-continuous phase microemulsion, its preparation method, and a drilling fluid containing the microemulsion and its preparation method. The purpose of realization is to obtain a Good viscoelasticity, high dynamic shear force, low plastic viscosity dual-continuous phase microemulsion, the drilling fluid prepared by using this microemulsion can avoid bit sticking, effectively inhibit the hydration expansion of shale formation, and thus benefit the borehole wall Stable and at the same time easily removed by neutral aqueous solutions

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