Non-fluorosilicon supercritical carbon dioxide fluid tackifier, preparation method and application thereof

Abstract

The invention belongs to the technical field of tackifier, and discloses a non-fluorosilicon supercritical carbon dioxide fluid tackifier, a preparation method and an application thereof. Cyclodextrinand its derivatives are taken as host compounds and alkyl, aromatic or ether compounds are taken as guest compounds. Polymers with suitable skeleton units and carbon dioxide-friendly units are synthesized; the host unit and the guest unit respectively are grafted to obtain the host polymer and the guest polymer respectively; the host-guest polymer is synthesized by self-assembly of the host polymer and the guest polymer to obtain a non-fluorosilicon supercritical carbon dioxide fluid tackifier. According to the invention, the greenhouse effect gas CO2 can be recycled, waste can be turned intotreasure, and economy can be created; it can improve the comprehensive benefits of oil and gas drilling and development, including reducing losses by increasing drilling speed, increasing oil and gasproduction by protecting reservoirs and improving oil and gas recovery ratio. Therefore, the expected economic and social benefits after industrialization are considerable.

Description

technical field [0001] The invention belongs to the technical field of thickeners, and in particular relates to a non-fluorosilicone supercritical carbon dioxide fluid thickener, a preparation method and an application. Background technique [0002] At present, the closest existing technology: With the rapid growth of the national economy's demand for oil and gas resources and the implementation of the new national oil and gas energy strategy, my country is increasing the use of unconventional oil and gas reservoirs, shale gas, coalbed methane, and heavy oil. Exploration and development of oil and gas resources. Supercritical carbon dioxide fluid has the characteristics of density close to water, diffusion coefficient greater than water, surface tension close to zero, strong solvation ability, etc., which can significantly increase the mechanical penetration rate, has no damage or pollution to the reservoir, and is easy to enter the capillary pores of the reservoir Displacem...

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Problems solved by technology

[0003] In 2018, my country's CO 2 The annual emission reaches 10 billion tons, about 15% of which comes from gas field exploitation, but a large amount of CO 2 is not recycled, a major reason is that the recovered CO 2 There is no market, direct storage has no economic value, and cannot stimulate the enthusiasm of recycling companies

[0007] In summary, there are still the following problems in the research and development of supercritical carbon dioxide fluid viscosifiers: ① the outstanding contradiction between the solubility and viscosity of non-fluorine silicon polymers in supercritical carbon dioxide fluid; ② fluorine-containing silicon polymers The amount of polymers and surfactants is too large, the price is expensive, and the application prospect is not good; ③ The non-covalent interaction between the reported polymers is weak, and the viscosity-increasing effect is not satisfactory

[0009] (1) At present, there is a prominent contradiction between the solubility and viscosity of non-fluorosilicone polymers in supercritical carbon dioxide fluid in supercritical carbon dioxide fluid viscosifiers

[0010] (2) At present, the amount of fluorine-containing silicon polymer and surfactant in supercritical carbon dioxide fluid viscosifier is too large, the price is expensive, and the application prospect is not good

[0011] (3) At present, the supercritical carbon dioxide fluid viscosifier has the problem that the non-covalent interaction between the polymers is weak, and the viscosity increasing effect is not satisfactory; the current viscosity of the thickened supercritical carbon dioxide fluid is not higher than 5mPa.s, which is still not satisfactory Supercritical carbon dioxide fluid is used in coiled tubing drilling, unconventional oil and gas reservoir sand fracturing and high-efficiency displacement

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