Multiple composite gel leak-stopping agent used for well drilling

Abstract

The invention provides a preparation method and application of a multiple composite gel leak-stopping agent. The multiple composite gel leak-stopping agent comprises 5-10 parts by weight of rigid particles, 5-15 parts by weight of a flexible material, 60-85 parts by weight of a curable polymer, and 2-10 parts by weight of an accelerating agent. Components of the leak-stopping agent combine for multiple cooperation. The added rigid particles cooperate with polymer gel to provide bearing capability, and the flexible fiber material improves the tear resistance. Through regulation of the content of the accelerating agent, the curing time of the leak-stopping agent can be controlled to meet different time requirements of the leak-stopping agent for gel forming in the leak conditions with different degrees. The leak-stopping agent can effectively block leak channels, is good in adaptivity, can provide efficient blocking in low or high pressure, and is high in bearing strength. The leak-stopping agent can be used to leak-stopping operation of well drilling, and can overcome the problem of well leak with different degrees and depths.

Description

technical field [0001] The invention relates to the technical field of oil drilling plugging, in particular to a multi-component composite gel plugging agent for drilling. Background technique [0002] Lost circulation is one of the common downhole complex situations in the drilling process. It not only consumes drilling time and loses mud, but also may cause a series of complicated situations such as pipe sticking, blowout, well collapse, etc., and even lead to the scrapping of the wellbore, causing major economic losses. loss. [0003] Lost circulation agent is an indispensable material basis in the process of leak prevention and plugging in drilling engineering, and the use of a good plugging agent is the key to solving the problem of lost circulation. Bridging plugging is generally used in the domestic treatment of lost circulation, which accounts for more than 50% of the entire lost circulation treatment method. Bridging plugging has the advantages of low cost, conveni...

AI Technical Summary

Problems solved by technology

For example, CN103911133A discloses a plugging composition containing fruit shells, sawdust, mica, and straw, which achieves effective plugging through different particle sizes; LCM and kelp powder, etc. Although these materials can improve the plugging effect to a certain extent, the wells are usually under extreme conditions of high temperature, high pressure and corrosion. The above-mentioned plugging materials or plugging agents are easy to change. Soft corrosion, resulting in plugging failure or secondary leakage

CN104531109A, CN104498000A, CN102443383A, etc. disclose composite plugging agents made of new chemical materials, but these often cause relatively large environmental pollution, and the cost is high, and are not suitable for a large amount of use in drilling plugging

CN104559973A discloses an elastic plugging agent, which is mainly composed of elastic temporary plugging particles and a bridging agent, which can expand to form a plugging layer when exposed to water, but the time for forming the plugging layer cannot be adjusted