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Cross-linking agent for oil field produced water solution preparation and preparation method of cross-linking agent

A technology of cross-linking agent and produced water, which is applied in chemical instruments and methods, mining fluids, earthwork drilling and mining, etc. It can solve the problems of spatial network structure damage, decrease in the number of hydrophobic units, increase in apparent viscosity, etc., and achieve the goal of preparation process Simple, easy to obtain raw materials, strong salt resistance effect

Inactive Publication Date: 2018-06-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the amount of different surfactants increases, the apparent viscosity of the solution shows an increasing trend, but when the amount of surfactants is too large, the viscosity will decrease
The reason is that low-concentration surfactants form micelles, and the hydrophobic side chains are entwined in the micelles to form a dense supramolecular structure and a spatial network structure, resulting in an increase in apparent viscosity. The number of micelles formed increases, the average number of hydrophobic units in each micelle decreases, and the spatial network structure is destroyed, so that the solution shows a decrease in viscosity macroscopically.

Method used

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  • Cross-linking agent for oil field produced water solution preparation and preparation method of cross-linking agent
  • Cross-linking agent for oil field produced water solution preparation and preparation method of cross-linking agent

Examples

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Embodiment 1

[0022] The invention discloses a crosslinking agent for liquid preparation of oilfield produced water and a preparation method thereof. The crosslinking agent is composed of the following components in weight percent: sorbitol 8% to 15%, cationic polystyrene sulfonate 12% %-25%, solvent 10-20%, initiator 3-5%, catalyst 3%-5%, and the rest is water.

[0023] The specific operation steps of the preparation method of the crosslinking agent are as follows: add the sorbitol and the cationic polystyrene sulfonate of the formula quantity in the reactor, add the solvent and the initiator of the formula quantity simultaneously, and add the catalyst of the formula quantity, water Under vacuum conditions, stir and heat up to 180-190°C, react for 3-6 hours, and obtain a colorless and transparent liquid, which is the cross-linking agent for oilfield produced water.

[0024] The cross-linking agent prepared by the invention has strong salt-resistant performance, and at the same time takes i...

Embodiment 2

[0026] On the basis of Example 1, sorbitol is used to react with cationic polystyrene sulfonic acid or polystyrene sulfonate, the ratio of the two substances is 1: (1.5~3.5), and 10-20% solvent is added at the same time And 3-5% initiator, add 3%-5% catalyst, under the condition of water vacuum, stir and heat up to 180-190°C, react for 3-6 hours, and obtain a colorless transparent liquid, which is oilfield produced water Cross-linking agent for solution.

[0027] The cationic polystyrene sulfonate is a light amber liquid with a molecular weight of 100,000-200,000; the cationic polystyrene sulfonate is polystyrene sulfonic acid, sodium polystyrene sulfonate, polystyrene One of the potassium sulfonates.

[0028] Described solvent is a kind of in methanol, ethylene glycol, ether, glycerol.

[0029] The initiator is one of ammonium persulfate, sodium persulfate and sodium perbromate.

[0030] The catalyst is one of sodium hydroxide, potassium hydroxide and sodium bicarbonate. ...

Embodiment 3

[0034] On the basis of the foregoing examples, a three-necked flask with magnetic stirring and a thermometer is placed on a magnetic stirrer temperature control electric heating mantle, and 8% sorbitol and 12% polystyrene sulfonic acid (sorbitol and The material ratio of polystyrene sulfonic acid is 1:1.5), while adding 10% methanol and 3% sodium persulfate, adding 3% sodium hydroxide, 64% water, stirring and heating up under the condition of water vacuum to 180°C, and continuously stirred for 6 hours to obtain a colorless transparent liquid, which is the cross-linking agent for oilfield produced water preparation.

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Abstract

The invention discloses a cross-linking agent for oil field produced water solution preparation and a preparation method of the cross-linking agent. The cross-linking agent comprises the following components by weight percent: 8 to 15 percent of sorbitol, 12 to 25 percent of cationic polystyrene sulfonate, 10 to 20 percent of solvent, 3 to 5 percent of initiator, 3 to 5 percent of catalyst, and the balance of water. The preparation method comprises the following steps: adding the sorbitol and the cationic polystyrene sulfonate into a reactor according to the formula weight, adding the solventand the initiator according to the formula weight, adding the catalyst of the formula weight, vacuumizing, stirring, heating, reacting for 3 to 6 hours, and preparing colorless transparent liquid. Thecross-linking agent prepared by the invention has high salt resistance, also integrates certain oil resisting characteristic, is suitable for various oil field produced water to prepare fracturing liquid, is good in sand carrying performance compared with the gel-type fracturing liquid system, and can meet the high sand carrying requirement in the actual application process.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a crosslinking agent for liquid preparation of oilfield produced water and a preparation method thereof. Background technique [0002] Hydraulic fracturing technology is a key technology for low-permeability reservoir reconstruction. Hydraulic fracturing needs to consume a large amount of fresh water, which has an impact on local water resources, especially in water-scarce areas. At present, domestic environmental protection requirements have been significantly improved. [0003] With the deepening of oilfield development, the comprehensive water content gradually increases, and the cost of harmless treatment of a large amount of produced water is high and the efficiency is low. If the produced water can be used to prepare fracturing fluid, it is of great significance for the green development of the oilfield and cost reduction and efficiency increase. [0004] Oilfield pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80
CPCC09K8/80
Inventor 郭钢薛小佳闵琪唐梅荣吴江李楷范华波刘锦周晓群
Owner PETROCHINA CO LTD
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