In the entire process of oil drilling and oil and gas development, problems such as shale hydration expansion and wellbore instability have long constrained the efficiency of complex formation operations. Polyamines, with their unique molecular structure and strong adsorption properties, have become the core mainstream products in the field of petroleum inhibitors, suitable for the operational needs of various deep wells, ultra deep wells, and complex sensitive formations.
The core mechanism of action of polyamine inhibitors relies on a large number of primary and secondary amine active groups on the molecular chain, which quickly embed into the interlayer of clay crystals in shale. Through strong electrostatic adsorption, the negative charges on the surface of clay are neutralized, greatly reducing the hydration permeability and surface hydration effect of clay, and fundamentally preventing shale from absorbing water, expanding, and dispersing blocks. Compared to traditional inorganic salt inhibitors, its inhibitory effect is more long-lasting, and it can maintain stable performance at a high temperature of 200 ℃ without the problem of conventional agents failing at high temperatures.
In field applications in multiple domestic oil fields, polyamine inhibitors have shown outstanding performance: after being put into use in the Triassic mudstone formation at depths of 4300-5100 meters in Tahe Oilfield, the rate of complex accidents such as wellbore collapse and drilling jamming has decreased by more than 80%; After replacing traditional inhibitors with it in the Bohai Kenli 10-1 oilfield group, the flowability of drilling fluid is easier to control, and a layer of technical casing is directly eliminated, resulting in a 30% increase in single well operation efficiency. Low branching polyamine products can achieve a primary recovery rate of over 97% and a secondary recovery rate of over 84% for drilling cuttings. They can also simultaneously solve the problem of excessive slurry production from low-quality solid phases in drilling fluids, achieving dual effects of wellbore stability and drilling fluid cleaning.
At present, the new generation of supramolecular polyamine inhibitors can withstand temperatures up to 220 ℃ and have a relative inhibition rate of up to 98% on calcium soil. They also have the advantages of selective flocculation and low biological toxicity, fully adapting to the green drilling requirements of deep oil and gas blocks in Sichuan, Xinjiang, and other regions. They are the core additives in the field of petroleum extraction that consider safety, efficiency, and environmental protection. Specific situations require on-site analysis of samples
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