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

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

CN108504346AActive Publication Date: 2018-09-07SICHUAN UNIV
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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

Patent Timeline
07 Sep 2018
Publication
CN108504346A
IPC
C09K8/68; C09K8/66; C09K8/60
CPC
C09K8/602; C09K8/665; C09K8/68; C09K2208/26
Inventors
殷鸿尧; 冯玉军