A temperature-sensitive adhesive resin plugging agent and its preparation method and application

Abstract

The invention provides a temperature-sensitive adhesive resin plugging agent as well as its preparation method and application. The temperature-sensitive adhesive 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, and 0.5-6 parts of permanent solid-phase filling melting range regulator, and 0-30 parts of modified density regulator. The temperature-sensitive adhesive blocking agent of the present invention is based on different types of thermoplastic resins. When the temperature reaches the melting point of the blocking agent particles in the water phase, the surface of the blocking agent particles begins to melt and has a certain viscosity. Particles can be bonded to each other, and the particles of the lost circulation agent can also be bonded to the wall of the lost channel of the drilling fluid, which not only enhances the residence ability of the lost lost circulation agent in the lost channel, but also improves the overall density of the particles of the lost circulation agent accumulated in the sealing layer. Strength, making it less susceptible to pressure fluctuations, improving the success rate of one-time plugging and effectively avoiding re-leakage.

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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