Temperature-sensitive adhesion type bridging leaking stoppage system, leaking stoppage slurry and preparation method and application of temperature-sensitive adhesion type bridging leaking stoppage system and leaking stoppage slurry

Abstract

The invention provides a temperature-sensitive adhesion type bridging leaking stoppage system, leaking stoppage slurry and a preparation method and application of the leaking stoppage slurry. The temperature-sensitive adhesion type bridging leaking stoppage system is characterized by being prepared from the following raw materials in percentage by mass: 20 to 50 percent of temperature-sensitive adhesion type resin particles, 20 to 30 percent of rigid particle materials, 20 to 30 percent of elastic particle materials and 10 to 20 percent of fiber materials. The invention also provides a preparation method of the leaking stoppage slurry, which comprises the following steps: adding the temperature-sensitive adhesive resin particles, the rigid particle material and the elastic particle material into clear water or drilling fluid, and stirring at a high speed until the materials are uniformly dispersed; and then adding the fiber material, and stirring at a low speed until the fiber material is uniformly dispersed to obtain the temperature-sensitive adhesion type bridging leaking stoppage slurry. The leaking stoppage slurry provided by the invention is high in one-time leaking stoppage success rate, effectively avoids re-leakage, and overcomes the problems that a stacked leaking stoppage layer formed by a conventional bridging leaking stoppage material in a crack is low in strength and is easily influenced by pressure fluctuation to cause leaking stoppage failure.

Description

technical field [0001] The invention relates to a temperature-sensitive adhesive bridging plugging system, a plugging slurry and a preparation method and application thereof, belonging to the technical field of oil and gas drilling. 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% to 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 ...

AI Technical Summary

Problems solved by technology

Commonly used bridging plugging materials include rigid calcium carbonate particles, elastic particles, flexible fibers, etc. The prepared bridging plugging slurry has achieved good application results for plugging in permeable and micro-fractured leakage formations, 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%.

However, the above plugging agent is a plugging layer formed by the pressure difference between the wellbore fluid column and the formation. It has poor adhesion to the fracture wall and is easily damaged by pressure fluctuations, resulting in re-leakage.

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