Temperature-sensitive adhesion type resin plugging agent as well as preparation method and application thereof

Abstract

The invention provides a temperature-sensitive adhesion type resin plugging agent as well as a preparation method and application thereof. The temperature-sensitive adhesion type resin plugging agent comprises the following raw materials in parts by mass: 75-90 parts of a thermoplastic resin matrix, 5-15 parts of a melting temperature regulator, 2-8 parts of an organic lipid melting range regulator, 0.5-6 parts of a modified solid-phase filling melting range regulator and 0-30 parts of a modified density regulator. According to the temperature-sensitive adhesion type plugging agent disclosed by the invention, different types of thermoplastic resins are taken as matrixes, when the temperature reaches the melting point of plugging agent particles in a water phase, the surfaces of the plugging agent particles start to melt and have certain viscosity, the plugging agent particles can be mutually adhered, and the plugging agent particles can also be adhered to the wall surface of a drilling fluid leakage channel; the retention capacity of the plugging agent in a leakage channel is enhanced, the overall strength of the plugging agent among particles of a plugging layer is improved, the plugging agent is not prone to being influenced by pressure fluctuation, the one-time plugging success rate is increased, and re-leakage is effectively avoided.

Description

technical field [0001] The invention relates to a temperature-sensitive adhesive resin plugging agent, a preparation method and application thereof, and belongs to the technical field of oil and gas drilling engineering. Background technique [0002] Lost circulation is a common phenomenon in the process of oil drilling. According to statistics, the occurrence rate of lost circulation accounts for 20%-25% of the total number of wells in the world. Lost circulation will not only cause huge economic losses to the drilling project, but also lead to a serious drop in well pressure, which will have a great impact on the stability of the inner wall of the oil well. In severe cases, it will lead to blowout accidents, which seriously threaten the safety of drilling operations. sex. [0003] Aiming at well leakage accidents at home and abroad, plugging materials such as bridging, water-absorbing / oil-absorbing resin, curable, high-water loss, and polymer gel have been developed succe...

AI Technical Summary

Problems solved by technology

Commonly used bridging plugging materials include rigid calcium carbonate particles, elastic particles, flexible fibers, etc. Bridging plugging slurry has achieved good application results in plugging formations with permeability and micro-fracture loss, but for large The plugging of fractured leakage formations generally has problems such as low success rate of one-time plugging and high frequency of re-leakage

According to statistics, the global bridging plugging success rate is less than 40%. The main reason is that bridging plugging materials form a plugging layer through bridging, tensioning and filling. Linear contact, the plugging layer formed by the wellbore fluid column and formation pressure difference is easily damaged by pressure fluctuations, resulting in re-leakage, resulting in a low success rate of leakage plugging in large fractures

However, the thermoplastic resin elastomer materials used in the plugging agents provided by the above two patents are all single-type resin materials, which are industrial products and have not been modified. Their melting points, melting ranges, and densities are fixed values, and they are used alone. Or the plugging agent compounded with other bridging plugging materials such as sheet materials and flexible materials, which can only undergo melting reaction under specific and narrow temperature conditions, and the use temperature is limited, and the unmodified resin The material has low adhesion strength, and it is difficult to achieve high-strength adhesion and sealing effect under high temperature conditions

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