A long-acting sealant for sealing high-angle cracks and its preparation method

Abstract

The invention discloses a long-acting sealing agent for sealing high-angle cracks and a preparation method, which comprises hydrogenated nitrile rubber, phenolic resin, polyvinyl chloride resin, plasticizer, reinforcing agent, density regulator, reinforcing agent, Vulcanizing agent, anti-scorch agent and anti-aging agent, wherein the weight percentage of each component is: 33~42% hydrogenated nitrile rubber, 24~35% phenolic resin, 13~22% polyvinyl chloride resin, 3~8% % plasticizer, 2~6% reinforcing agent, 1~5% density regulator, 1~3% reinforcing agent, 1~3% vulcanizing agent, 0.2~1% anti-scorch agent, 0.2~0.8% anti-aging agent. The present invention proposes a long-acting sealant for sealing high-angle fractures aimed at the fault-block reservoirs in thrust belts at the western edge of the Ordos Basin. The long-acting sealant can consolidate high-angle fractures with different openings or Faults overcome the problems of fracturing fluid leakage and fracture height uncontrollable caused by natural fractures or fault penetrations that cannot be solved by conventional methods.

Description

A long-acting sealing agent for plugging high-angle cracks and preparation method thereof technical field The invention belongs to the chemical technology field of petroleum industry, relate in particular to a kind of long-acting seal of plugging high-angle cracks Solidifying agent and preparation method. Background technique [0002] The fault-block reservoir represented by the thrust belt in the western margin of the Ordos Basin requires hydraulic pressure due to its tight physical properties. However, high-angle natural fractures and micro-faults develop, penetrating the barrier layer up and down, and in hydraulic fracturing During the process, the developed natural fractures and faults will lead to a large amount of fracturing fluid filtration and uncontrolled fracture height, which will make the fracturing effective. The results are poor and even lead to the failure of fracturing construction. For reservoirs with high-angle fractures, there is currently no effect...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, to provide a long-acting sealant for sealing high-angle fractures and its preparation method, which overcomes 1 in the prior art: adding fluid loss control agents to reduce the influence of natural fractures , the disadvantage is that it cannot overcome the problem of out-of-control fracture height caused by the existence of natural fractures or faults; 2: Inject temporary plugging agents in the front of the fractures to seal natural fractures. The disadvantage is that the performance of plugging agents on the market varies, and most of them are temporary plugging pressure 3: Even if the fractures are blocked during fracturing, the formation water will rush into the oil layer after the plugging agent fails after fracturing and a large amount of water will come out, and the stimulation effect is poor, etc.

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