A kind of preparation method of micro-crosslinked water-based drilling fluid fluid loss reducer

A technology of water-based drilling fluid and fluid loss control agent, which is applied in the direction of drilling compositions, chemical instruments and methods, and can solve problems such as poor fluid loss control performance, increased polymer dissolution time, and increased product costs.

Active Publication Date: 2019-01-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

[0006] The above-mentioned patents all realize the improvement of the temperature and salt resistance of the fluid loss control agent by introducing functional units. In the process, there are often the following shortcomings: the preparation process of the functional monomer is cumbersome, and there are follow-up operations such as purification, which increases the product cost; and Compared with acrylamide monomers, functional monomers have poor polymerization activity, and the molecular weight of fluid loss control agent is not high. During use, the fluid loss control performance is not good, and the concentration of fluid loss The introduction of salt-type functional monomers reduces the solubility of polymers. During use, the dissolution time of polymers increases and the proportion of insolubles increases, which affects the use and promotion of products.

Method used

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  • A kind of preparation method of micro-crosslinked water-based drilling fluid fluid loss reducer

Examples

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Effect test

preparation example Construction

[0011] (1) Preparation of crosslinking agent

[0012] Add polyethylene polyamine, compounds containing halogen atoms and allyl groups, alkali, and acetone into a single-necked flask with magnetic stirring and a spherical condenser, stir to mix the raw materials evenly, control the temperature at 30-60°C, and magnetically stir React for 6 to 48 hours, filter the product, and distill the volatile components under reduced pressure at 50°C to obtain a viscous liquid that is the crosslinking agent; the concentration of polyethylene polyamine in acetone is 10 to 200 g / L; The mass ratio of polyethylene polyamine, halogen atom and allyl group-containing compound to base is 1:(0.5~5):(1~8);

[0013] (2) Preparation of fluid loss reducer

[0014] Add the cross-linking agent, non-ionic water-soluble monomer, anionic water-soluble monomer, and deionized water into a three-necked glass bottle equipped with a stirrer, nitrogen pipe and thermometer, stir until all raw materials are dissolve...

specific Embodiment approach

[0034] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0035] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0036] The present invention will be further described below in conjunction with specific examples, but the protection scope of the present invention is not limited thereto.

Embodiment 1

[0038] (1) Preparation of crosslinking agent

[0039] Add 10g of tetraethylenepentamine, 22g of allyl chloride, 30g of sodium carbonate, and 100mL of acetone into a single-necked flask with magnetic stirring and a spherical condenser, stir to mix the raw materials evenly, control the temperature at 50°C, and react under magnetic stirring After 18 hours, the product was filtered, and the volatile components were distilled off under reduced pressure at 50°C, and the obtained viscous liquid was the crosslinking agent.

[0040] (2) Preparation of fluid loss reducer

[0041] Add 10 mg of crosslinking agent, 10 g of vinylpyrrolidone, 10 g of 2-acrylamido-2-methylpropanesulfonic acid, and 120 g of deionized water into a three-necked glass bottle equipped with a stirrer, a nitrogen pipe and a thermometer, and stir After all the raw materials are dissolved, nitrogen gas is introduced for 30 minutes, the pH is controlled at 8.5, and the temperature is controlled at 35°C, then 20 mg of so...

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Abstract

The invention relates to a preparation method of a fluid loss control agent for branched water-based drilling fluid, and belongs to the technical field of oil field chemistry. Polyethylene polyamine compounds containing multiple double bonds are prepared by reacting polyethylene polyamines with halogenated hydrocarbons containing double bonds, which are used as crosslinking agents, and non-ionic water-soluble monomers such as acrylamide and vinylpyrrolidone, And anionic water-soluble monomers such as 2-acrylamide-2-methylpropanesulfonic acid and sodium styrenesulfonate are used as polymerization raw materials to synthesize polymers with micro-crosslinked structures. This kind of polymer has excellent heat resistance and salt resistance, and its molecular structure has a variety of functional groups, which can significantly improve the dispersion stability of clay particles, and is suitable as a fluid loss control agent for water-based drilling fluids under harsh conditions.

Description

technical field [0001] The invention relates to a preparation method of a micro-crosslinked fluid loss reducer for water-based drilling fluid, and belongs to the technical field of oilfield chemistry. Background technique [0002] With the continuous development of modern industry and the continuous improvement of economic level, the demand for energy in human society is getting higher and higher. Petroleum is one of the most important energy supply resources at present, and its exploitation and utilization are of great significance to the development of national economy and the stability of national security. With the intensification of exploration and development of deep oil and gas, formations encountered by drilling are becoming more and more complex. Usually the deeper the well, the higher the temperature and the more difficult it will be to drill. There are high-temperature formations in many areas of the world, such as the North Sea of ​​the United States and the Un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F226/10C08F220/58C08F226/02C08F228/02C08F212/14
CPCC09K8/035C08F220/58C08F226/10C08F220/585C08F226/02C08F222/385C08F228/02C08F212/14
Inventor 曹杰冯奇张建贝宋涛吕开河邱正松
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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