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Solid aluminum citrate crosslinking agent, its preparation method and application

A technology of aluminum citrate and cross-linking agent, applied in carboxylate preparation, chemical instruments and methods, organic chemistry, etc., can solve the problems of increased process and cost, transportation and storage difficulties, and achieve the effect of avoiding transportation and storage difficulties

Active Publication Date: 2019-05-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The main purpose of the present invention is to provide a kind of solid aluminum citrate cross-linking agent, its preparation method and its application, to solve the difficulty in transportation and storage caused by most of the prepared aluminum citrate cross-linking agents in the prior art, synthesis Post-drying will increase the process and cost problems

Method used

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Examples

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Effect test

preparation example Construction

[0026] As introduced in the background technology section, most of the aluminum citrate crosslinking agents prepared by the existing preparation methods are liquid, which has problems such as transportation and storage difficulties, and drying after synthesis will increase the process and cost. In order to solve this problem, the present invention provides a preparation method of a solid aluminum citrate crosslinking agent, which comprises the following steps: reacting citric acid with polyaluminum chloride to obtain a solid aluminum citrate crosslinking agent.

[0027] In the above preparation method provided by the present invention, polyaluminum chloride is used as the aluminum source to react with citric acid. Polyaluminum chloride is an inorganic polymer compound. After reacting it with citric acid, the solid aluminum citrate crosslinking agent can be directly obtained in a solid state. This solid state is similar to damp clay and does not have Fluidity, but can be deform...

Embodiment 1

[0053] This example prepared a solid aluminum citrate crosslinker.

[0054] Preparation:

[0055] Step 1. Connect the inlet and outlet of the circulating water bath to a 1L reaction bottle, and install a condensation reflux device on the reaction bottle. Add 200g ethanol and 200g (1.04mol) citric acid into the reaction flask, stir at 50°C and a speed of 150r / min for 20-30min to fully dissolve the citric acid and form a citric acid solution; add 230g (1.34mol) Add the polyaluminum chloride solution prepared by polyaluminum chloride and 230g ethanol into the reaction kettle, keep the above temperature and conditions and continue to stir for 1h to form a mixed solution.

[0056] Step 2, adjust the pH value of the mixed solution with a NaOH aqueous solution with a mass concentration of 30%. When the pH value is adjusted to 5, increase the stirring speed to 400r / min, slowly add the NaOH aqueous solution drop by drop until the pH value is 6.5, continue Reaction 2h. After discharg...

Embodiment 2

[0062] This example prepared a solid aluminum citrate crosslinker.

[0063] Preparation:

[0064] Step 1. Connect the inlet and outlet of the circulating water bath to a 1L reaction bottle, and install a condensation reflux device on the reaction bottle. Add 200g ethanol and 200g (1.04mol) citric acid into the reaction flask, stir at 50°C and a speed of 150r / min for 20-30min to fully dissolve the citric acid to form a citric acid solution; add 264g (1.5mol) Add the polyaluminum chloride solution prepared by polyaluminum chloride and 260g ethanol into the reaction kettle, keep the above temperature and conditions and continue to stir for 1h to form a mixed solution;

[0065] Step 2, adjust the pH value of the mixed solution with a NaOH aqueous solution with a mass concentration of 40%. When the pH value is adjusted to 5, increase the stirring speed to 400r / min, slowly add the NaOH aqueous solution drop by drop until the pH value is 7.0, continue Reaction 2h. After dischargin...

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Abstract

The invention provides a solid aluminum citrate cross-linking agent, and a preparation method and application thereof. The preparation method comprises a step of reacting citric acid with aluminum polychlorid so as to obtain the solid aluminum citrate cross-linking agent. In the preparation method, aluminum polychlorid is used as an aluminum source for reaction with citric acid; as aluminum polychlorid reacts with citric acid, the solid aluminum citrate cross-linking agent in a solid state can be directly obtained and the solid state is like the state of wet clay, so the solid aluminum citrate cross-linking agent does not have fluidity; and thus, difficulties in transportation and storage of the solid aluminum citrate cross-linking agent are reduced, and increase of procedures and cost in later drying treatment is avoided. Moreover, the solid aluminum citrate cross-linking agent prepared by using the method has aluminum ion content of 3 to 8.5%, which is beneficial for reduction in the usage amount of the cross-linking agent in usage. In addition, the cross-linking agent crosslinks with HPAM to form gel with viscosity of 12000 mpa.s, which is beneficial for improving the profile control and water plugging effect of an oil field.

Description

technical field [0001] The invention relates to the field of oilfield profile control and water shutoff, in particular to a solid aluminum citrate crosslinking agent, its preparation method and its application. Background technique [0002] In oilfield exploitation, oilfield development has gradually entered a period of medium-high water cut. The development of water-flow dominant channel leads to the channeling of injected water and polymer along the high-permeability layer, which will increase the invalid circulation of injection fluid and make the oil displacement effect worse. In order to improve the oil displacement effect, oilfield profile control and water shutoff operations are usually required. Among the numerous profile control and water shutoff technologies, the gel profile control and water shutoff technology can effectively adjust the profile and increase the swept volume of injected water, thereby improving the oil displacement efficiency. [0003] In gel pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/41C07C59/265C09K8/512
Inventor 汪进罗强原凤刚唐可王凤清
Owner PETROCHINA CO LTD
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