Antifreeze clean fracturing fluid and preparation method thereof

A technology for cleaning fracturing fluids and surfactants, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high energy consumption, easy freezing and high freezing point, and achieve simple preparation process and formation damage. Small, good fluidity

Active Publication Date: 2018-09-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional fracturing fluid system, whether it is a clean fracturing fluid or a polymer fracturing fluid, is mainly composed of water. Although it endows the fracturing fluid with better viscoelasticity, it will also cause its freezing point (freezing The temperature) is high, and it is difficult to construct in a low temperature environment due to freezing
After the fracturing fluid freezes, it is not only easy to cause freezing blockage, which increases the risk factor of construction, but also increases the "rich volume" of the fracturing fluid, which wastes a lot of fracturing fluid
For example, the average winter temperature of the Sulige gas field located in the Sulige area of ​​my country is usually lower than -10°C. The fracturing of its large horizontal wells requires a large amount of fracturing fluid, and it takes a long time to prepare the fluid. The fracturing fluid will freeze and block the valve. , resulting in the inability to carry out the construction
To solve the problem of fracturing fluid freezing, one is to add an insulation layer to the fluid tank and wrap it with thick anti-cold materials, such as rock wool, glass wool, polyurethane foam tiles, etc., but this method can only provide short-term insulation effect, limited cold resistance
The second is to heat the fracturing fluid, but this method takes a long time, consumes a lot of energy, and cannot be applied on a large scale
The above two methods are difficult to solve the problem of fracturing construction in oil and gas fields in severe cold areas. Only by greatly reducing the freezing point of fracturing fluid and developing low temperature resistant and antifreeze fracturing fluid can the root cause of this problem be solved

Method used

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  • Antifreeze clean fracturing fluid and preparation method thereof
  • Antifreeze clean fracturing fluid and preparation method thereof
  • Antifreeze clean fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In the present embodiment, the formula of the antifreeze cleaning fracturing fluid is as follows:

[0044]

[0045] Preparation: Add the formulated amount of glycerol and sodium chloride to water at room temperature, then add N-(cis-docos-9-enoic acid amidopropyl)-N,N-dimethyl-N -Propyl sulfobetaine, stirred until N-(cis-docos-9-enoic acid amidopropyl)-N,N-dimethyl-N-propyl sulfobetaine is fully dissolved and mixed Evenly obtain antifreeze fracturing fluid.

[0046] The rheological properties of the prepared solutions were tested using a rotational rheometer (Anto Paar, MCR 301). At a shear rate of 170s -1 The relationship between the viscosity of the fracturing fluid as a function of temperature and time was tested. Test initial temperature -25°C, at 3°C·min -1 The heating rate is raised to 90°C, and then sheared at a constant temperature for 60 minutes. The test results are shown in figure 1 . Depend on figure 1 It can be seen that at the initial temperature...

Embodiment 2

[0048] In the present embodiment, the formula of the antifreeze cleaning fracturing fluid is as follows:

[0049]

[0050] Preparation: Add the formulated amount of glycerol and sodium chloride to water at room temperature, then add N-(cis-docos-9-enoic acid amidopropyl)-N,N-dimethyl-N -Propyl sulfobetaine, stirred until N-(cis-docos-9-enoic acid amidopropyl)-N,N-dimethyl-N-propyl sulfobetaine is fully dissolved and mixed Evenly obtain antifreeze fracturing fluid.

[0051] The rheological properties of the prepared solutions were tested using a rotational rheometer (Anto Paar, MCR 301). At a shear rate of 170s -1 The relationship between the viscosity of the fracturing fluid as a function of temperature and time was tested. Test initial temperature -25°C, at 3°C·min -1 The heating rate is raised to 90°C, and then sheared at a constant temperature for 60 minutes. The test results are shown in figure 2 . Depend on figure 2 It can be seen that at the initial temperatu...

Embodiment 3

[0053] In the present embodiment, the formula of the antifreeze cleaning fracturing fluid is as follows:

[0054]

[0055] Preparation: Add the formulated amount of glycerol and sodium chloride to water at room temperature, then add N-(cis-docos-9-enoic acid amidopropyl)-N,N-dimethyl-N -Propyl sulfobetaine, stirred until N-(cis-docos-9-enoic acid amidopropyl)-N,N-dimethyl-N-propyl sulfobetaine is fully dissolved and mixed Evenly obtain antifreeze fracturing fluid.

[0056] The rheological properties of the prepared solutions were tested using a rotational rheometer (Anto Paar, MCR 301). At a shear rate of 170s -1 The relationship between the viscosity of the fracturing fluid as a function of temperature and time was tested. Test initial temperature -25°C, at 3°C·min -1 The heating rate is raised to 90°C, and then sheared at a constant temperature for 60 minutes. The test results are shown in image 3 . Depend on image 3 It can be seen that at the initial temperature...

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Abstract

The invention relates to antifreeze clean fracturing fluid which comprises the following components in percentage by weight: 2.0-15.0 percent of surfactant, 1.0-20.0 percent of water-soluble salt, 28.0-55.0 percent of alcohol and 36.0-55.0 percent of water. According to the different surfactants selected, the clean fracturing fluid is divided into two types. The first type of antifreeze clean fracturing fluid comprises the following components in percentage by weight: 2.0-5.0 percent of surfactant, 2.0-20.0 percent of water-soluble salt, 28.0-55.0 percent of alcohol and 38.0-55.0 percent of water, wherein the surfactant is at least one of zwitterionic surfactants of which a respective hydrophobic tail chain is an unsaturated dococyl hydrocarbyl chain. The second type of antifreeze clean fracturing fluid comprises the following components in percentage by weight: 9.0-15.0 percent of surfactant, 3.0-15.0 percent of water-soluble salt, 33.0-52.0 percent of alcohol and 36.0-50.0 percent ofwater, wherein the surfactant is at least one of zwitterionic surfactants of which a hydrophobic tail chain is an unsaturated octadecyl hydrocarbyl chain. The antifreeze clean fracturing fluid provided by the invention has the benefits that while the performance of the fracturing fluid is ensured, the freezing point of the fracturing fluid is reduced, and the low temperature-resistant use performance is improved, so that the antifreeze clean fracturing fluid still can be safely used in a working environment of below zero.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry and fracturing stimulation, and in particular relates to a low-temperature resistant antifreeze clean fracturing fluid system suitable for the development of oil and gas reservoirs in severe cold regions. Background technique [0002] With the continuous development of oil and gas reservoirs, the oil and gas production gradually decreases. The implementation of hydraulic fracturing is an important production stimulation measure to improve the productivity of oil and gas wells and the recovery of oil reservoirs. Hydraulic fracturing refers to the use of surface high-pressure equipment to inject viscoelastic fluid (fracturing fluid) with a certain sand-carrying capacity that exceeds the absorption energy of the formation into the formation through the oil and gas wellbore. When the formation pressure exceeds the fracture pressure, it will produce For fractures with a certain conductivity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/66C09K8/60
CPCC09K8/602C09K8/665C09K8/68C09K2208/26
Inventor 殷鸿尧冯玉军
Owner SICHUAN UNIV
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