Preparation method of supramolecular water plugging agent for improving water-intake profile of oil pool
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A water-absorbing profile and supramolecular technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as limited validity period, molecular weight drop, and performance degradation, and achieve good injectability, simple on-site construction, and pumpability Good results
Inactive Publication Date: 2015-09-23
CHINA PETROLEUM & CHEM CORP +1
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Although this technology can be used in high-temperature and high-salt oil reservoirs, since polyacrylamide is a high-molecular-weight polymer, its performance will be reduced due to the shearing of porous media in the oil reservoir, and thermal degradation at high temperatures will also cause make it valid for a limited period
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Embodiment 1
[0026] (1) Modified phenolic resin, 0.1 part;
[0027] (2) proppant, a water-soluble modified polyacrylamide, 0.04 parts;
[0036] (4) Regulator, high-valent metal salt AlCl 3 , 0.5 copies;
[0037] (5) Water: 90 parts
[0038] The viscosity of the system is 1.5 mPa·s, and the state is whey to light khaki whey.
[0039] The mechanism of the invention is: in mutual solvent, under the action of regulator, low molecular weight phenolic resin is supported by viscoelastic polymer to form supramolecule. The supramolecule has both viscoelasticity and particle characteristics, enters the porous medium of the reservoir, and adsorbs with formation rocks, resulting in plugging. Under the action of water, the system can migrate to the deep part of the reservoir to realize deep liquid flow improvement. To achieve the purpose of adjusting the deep water absorption profile.
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Abstract
The invention discloses a preparation method of a supramolecular water plugging agent for improving a water-intake profile of an oil pool. The preparation method of the supramolecular water plugging agent for improving the water-intake profile of the oil pool comprises a mass fraction formula and a making method, wherein the mass fraction formula is that the ratio of modified phenolic resin to a polymer to a hydroxyl compound to a high-price metal salt to water is equal to (0.05 to 0.3): (0.005 to 0.08): (10 to 20): (0.2 to 0.8): (80 to 90); according to the formula, a supporting agent modified polyacrylamide is added into the water in a certain proportion, an obtained mixture is uniformly agitated, and then the hydroxyl compound is added into the agitated obtained mixture, and a newly obtained mixture is uniformly agitated. Afterwards, the modified phenolic resin is added into the newly obtained mixture, subsequently, a conditioning agent high-price metal salt is added into a finally obtained mixture, and an obtained product is mixed. The preparation method of the supramolecular water plugging agent for improving the water-intake profile of the oil pool has the advantages that a system having viscoelasticity and particle property at the same time can be formed; the supramolecular water plugging agent has favorable chemical stability and heat stability, and is resistant to a temperature up to 90 DEG C. The supramolecular water plugging agent has the characteristics of low viscosity, good pumpability, good injectivity, simple site operation, safety and reliability, and can dynamically penetrate into the deep part of the oil pool for carrying out plugging, so as to improve the water-intake profile of the oil pool, and to achieve the purpose of changing the direction of a liquid flow.
Description
Technical field: [0001] The invention relates to a preparation method of a supramolecular water blocking agent for improving the water absorption profile of an oil reservoir. Committed to improving the deep water absorption profile of the reservoir. technical background [0002] The natural existence of the reservoir and the heterogeneity caused by long-term water injection are the important reasons why the remaining oil in the deep low permeability zone of the water injection development reservoir cannot be recovered. Researchers have been working on the technical research of improving the deep water absorption profile of the reservoir, so as to increase the recovery rate of the mature oilfield in the development stage of ultra-high water cut. At present, relatively mature technologies include weak gels and cross-linked polymers. However, the current technology mainly uses polyacrylamide as the main agent. Although this technology can be used in high-temperature and high...
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