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Clay stabilizer for reservoir reconstruction and fracturing and preparation method thereof

A clay stabilizer and a technology for reservoir reconstruction, which are applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of reducing the effective permeability of the reservoir near the wellbore, and achieve strong adaptability to the construction environment and anti-swelling. High rate, mild conditions for effect

Active Publication Date: 2021-03-02
CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of well killing operation, in view of the hydration expansion, dispersion and migration of clay minerals in water-sensitive reservoirs, clay stabilizers need to be added to the well killing fluid to prevent hydration expansion, dispersion transfer or precipitation of clay However, at the same time, the compatibility between the clay stabilizer and the well killing fluid must be good, that is, there will be no precipitation, turbidity, delamination, etc. after the two are mixed, and no harmful chemical reactions can occur with formation fluids and rocks, such as Form precipitation or change the interfacial tension and wettability of formation rocks, which would otherwise reduce the effective permeability of the near-wellbore reservoir

Method used

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  • Clay stabilizer for reservoir reconstruction and fracturing and preparation method thereof
  • Clay stabilizer for reservoir reconstruction and fracturing and preparation method thereof
  • Clay stabilizer for reservoir reconstruction and fracturing and preparation method thereof

Examples

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preparation example Construction

[0029] The preparation method of reservoir reconstruction fracturing clay stabilizer comprises the following steps:

[0030] (1) The three-necked reaction flask that reflux condenser and thermometer are housed is placed in constant temperature magnetic stirrer, then in the three-necked flask, add 9.85g p-aminophenol and 3.64g sodium methylate, the mixed solution of 25g acetone and 50g ethanol, constant temperature The temperature of the stirrer is room temperature, the stirring speed is 800r / min, and condensing water is passed into the reflux condenser tube and stirred at a low speed at room temperature while the reaction vessel is evacuated to a vacuum of 0.04MPa and replaced with helium 5 times After the replacement, the protective gas helium was continuously introduced, and the oil bath was heated to 116°C.

[0031] (2) Use a constant pressure dropping funnel to drop 18.5g of epichlorohydrin with a concentration of not less than 99% at a rate of 15mL / min. After the addition...

Embodiment 2

[0035] (1) Place the three-necked reaction flask equipped with a reflux condenser and a thermometer in a constant temperature magnetic stirrer, then add 11.8g p-aminophenol and 3.64g sodium methylate, 25g acetone and 50g ethanol to the three-necked flask, and stir at this moment The temperature of the device is room temperature, and the stirring speed is 800r / min, and the condensing water is passed into the reflux condenser and stirred at a low speed at room temperature while the reaction vessel is evacuated, and the vacuum is 0.04MPa and replaced 5 times with helium, After the replacement, the protective gas helium was continuously introduced, and the oil bath was heated to 120°C.

[0036] (2) Use a constant pressure dropping funnel to drop 18.5g of epichlorohydrin with a concentration of not less than 99% at a rate of 15mL / min. After the addition is complete, continue heating to 140°C and react for 5 hours to obtain a light brown color mid product.

[0037] (3) The product ...

Embodiment 3

[0040] (1) The three-necked reaction flask that reflux condenser and thermometer are housed is placed in the constant temperature magnetic stirrer, then in the three-necked flask, add 14.8g p-aminophenol and 3.64g sodium methylate, 25g acetone and 50g ethanol, this moment constant temperature stirring The temperature of the device is room temperature, the stirring speed is 800r / min, and the condensing water not higher than 25°C is passed into the reflux condenser tube and stirred at a low speed at room temperature while vacuuming the reaction vessel. The vacuum degree is 0.04MPa and used Helium was replaced 5 times. After the replacement, the protective gas helium was continuously introduced, and the oil bath was heated to 116°C.

[0041] (2) Use a constant pressure dropping funnel to drop 18.5g of epichlorohydrin with a concentration of not less than 99% at a rate of 15ml / min. After the addition is complete, continue heating to 130°C and react for 6 hours to obtain light brown...

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Abstract

The invention relates to the field of petroleum exploitation, in particular to a clay stabilizer for reservoir reformation fracturing and a preparation method thereof. The method comprises the following steps of: (1) using p-aminophenol and epichlorohydrin as raw materials to obtain an intermediate product as shown in a formula I under the catalysis of sodium alcoholate; and (2) using the intermediate product as shown in the formula I and ammonia gas as raw materials to obtain the clay stabilizer for the reservoir reformation fracturing as shown in a formula II. The clay stabilizer for the reservoir reformation fracturing as shown in the formula II contains a benzene ring with relatively high polarity, so that the clay stabilizer further has very high polarity while having the advantages of a common polyether amine clay stabilizer, the clay stabilizer can be easily discharged after used as a fracturing fluid additive, and the clay stabilizer can protect the environment better, has an advantage in anti-expansion rate, and has more wide development prospects in oil and gas field exploitation. The formulas are shown in the description.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a clay stabilizer for reservoir reconstruction and fracturing and a preparation method thereof. Background technique [0002] The purpose of drilling and completion is mainly to form oil and gas seepage channels and establish good oil and gas production conditions. Any additional factors that hinder the flow of oil and gas into the bottom of the production well are called pollution or damage of oil and gas reservoirs. In every process of drilling and completion and other production stimulation measures, oil and gas reservoirs may be damaged, thereby greatly reducing the efficiency of oil and gas production. [0003] All kinds of clays can absorb water and swell, but different clay minerals have different degrees of hydration swelling. Clay minerals are the main filling materials of reservoir rocks. When in contact with incompatible external fluids, clay will hydrate, swell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C08G65/28C08G65/325
CPCC08G65/2627C08G65/3255C08G2650/04C08G2650/50C09K8/608C09K8/68C09K8/885C09K2208/12
Inventor 康远波董兵强张烨陆朝晖张健强潘林华王彦玲戎旭峰
Owner CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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