Tackifying and shear strength improving agent as well as preparation method and application of tackifying and shear strength improving agent

Abstract

The invention relates to a tackifying and shear strength improving agent and a preparation method thereof. The tackifying and shear strength improving agent disclosed by the invention is prepared through the steps of reacting dimeric fatty acid and polyethylene polyamine according to the molar ratio, namely 1: (0.4-1.6) of carboxyl to amino in the existence of triethylene glycol monobuthyl ether, wherein the reaction temperature is 140-160 DEG C; keeping the temperature until no water comes off, and then, further reacting for 10-20 minutes to finish the reaction; and removing water generated by the reaction while reacting. A soilless oil-based drilling fluid system with the tackifying and shear strength improving agent is good in suspension property, enhanced in solid-phase and stratum water pollution resistance, little in reservoir damage, increased in system permeability recovery value, stable in performance, strong in inhibiting property, good in lubricating property, low in plastic viscosity and high in temperature resistance up to 260 DEG C.

Description

technical field [0001] The present application relates to the field of oil development drilling fluids, in particular to a viscosity-increasing and shearing-increasing agent for soilless oil-based drilling fluids and its preparation method and use. Background technique [0002] Oil-based drilling fluid is a drilling fluid with oil as the continuous phase. Compared with water-based drilling fluid, oil-based drilling fluid has high temperature resistance, salt intrusion resistance, strong inhibition, good borehole wall stability, and good lubricity. Oil-based drilling fluid has become an important method for drilling high-temperature deep wells, high-inclination directional wells and various complex wells. Due to the strong gelation of organic soil in the common oil-based drilling fluid—oil-based drilling fluid containing organic soil, the rheology of the system is often poor under high-density conditions, and the mud cake is thick, which leads to poor tripping and mechanical ...

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Problems solved by technology

Due to the strong gelation of organic soil in the common oil-based drilling fluid—oil-based drilling fluid containing organic soil, the rheology of the system is often poor under high-density conditions, and the mud cake is thick, which leads to poor tripping and mechanical drilling. Due to the disadvantages of low drilling speed and high drilling cost, research on soil-free oil-based drilling fluid has been carried out in my country.

The problems encountered in the current research on soil-free oil-based drilling fluids are poor suspension and barite settlement easily occurs when the density is high. Although there are many kinds of regulators, viscosifiers and shearing Viscosity and cutting agents are mostly only suitable for common oil-based drilling fluids—oil-based drilling fluids containing organic soil, which cannot solve the problem of soil-free oil-based drilling fluids. For example, a mineral oil-based drilling fluid has been disclosed in the prior art Polyamidoamine flow pattern modifier for oil-based drilling fluid, which is prepared by amidation reaction of dimerized fatty acid and polyamine, and then uniformly mixing the reactant with a solvent

However, this conditioner is mainly used in common oil-based drilling fluids—oil-based drilling fluids containing organic soils. The application effect in soil-free oil-based drilling fluids that do not contain organic soils is not significant, and the filter loss is large and the adjustment The preparation of the agent needs to be carried out under the condition of nitrogen, and the whole reaction takes 2 to 3 hours, the reaction is slow and the cost is high

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