Preparation method of high temperature resistant contraction-expansion system for promoting stratum clay modification

A high-temperature-resistant, clay-based technology, applied in the field of preparation of high-temperature-resistant shrinkage-swelling systems, can solve the problems of short anti-swelling period and inability to treat reservoirs, and achieve wide application range, high anti-swelling and shrinkage ratio, and long-lasting anti-swelling effect Effect
CN103539902AActive Publication Date: 2014-01-29CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2014-01-29

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Abstract

The invention provides a preparation method of a high temperature resistant contraction-expansion system for promoting stratum clay modification. The high temperature resistant contraction-expansion system is prepared from the following raw materials in parts by mol by using the preparation method in the following steps: a. adding dimethylamine into a reaction kettle, controlling the temperature to 25-45 DEG C, adding epoxy chloropropane while stirring according to a ratio of dimethylamine to epoxy chloropropane of (3-4): 1, heating up to 65-70 DEG C when adding the epoxy chloropropane to 40-60% of the dosage, and then, adding the residual epoxy chloropropane, and reacting for 2-3 h to obtain an intermediate A; b. firstly dissolving potassium hydroxide in water and adding crylic acid in the aqueous solution of potassium hydroxide according to a mol ratio of dimethylamine to crylic acid of 1: (0.05-0.1) and a mol ratio of crylic acid to potassium hydroxide of 1: (0.8-1.2), and then, adding acrylamide according to a mol ratio of crylic acid to acrylamide of 1: (0.2-0.5) to obtain a mixed solution; and c. adding an initiator into the mixed solution obtained in the step b under nitrogen protection, stirring to react for 2-3h, adding the intermediate A obtained in the step a, and reacting for 2-3 h to obtain a product.
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Description

Technical field:

[0001] The invention relates to a preparation method of a clay anti-swelling and shrinking system in oil exploitation, in particular to a preparation method of a high-temperature-resistant shrinking and swelling system that promotes the modification of formation clay. Background technique:

[0002] During the development of oil and gas fields, some sensitive reservoirs contain clay minerals (montmorillonite and illite). These components will expand and migrate when exposed to water, and the permeability of the formation will decrease, which seriously affects the oil and gas development effect. Moreover, with the continuous water injection of this type of oil and water wells, the coning of bottom water and the entry of water for acidification, fracturing, and workover industries will gradually reduce the permeability of clay-containing formations, directly affecting the normal production of oil and water wells. In the block developed by water injection, the c...

Claims

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