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Thickening agent, fracturing fluid, preparation method of fracturing fluid, gel breaking method of fracturing fluid and application method of fracturing fluid

An application method and thickening agent technology, applied in the field of fracturing fluid, can solve the problems of high viscosity of fracturing fluid, flocculent sedimentation, oil recovery without imbibition, etc., achieve strong oil washing, increase permeability, increase modification ability, The effect of changing the interfacial tension of oil and water

Pending Publication Date: 2022-05-13
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a thickening agent, fracturing fluid and its preparation method, a gel breaking method and application method of fracturing fluid, so as to solve the problem of high viscosity of fracturing fluid in the prior art and lack of ability to promote imbibition oil recovery. Function and technical problems of flocculent precipitate formed after gel breaking

Method used

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  • Thickening agent, fracturing fluid, preparation method of fracturing fluid, gel breaking method of fracturing fluid and application method of fracturing fluid
  • Thickening agent, fracturing fluid, preparation method of fracturing fluid, gel breaking method of fracturing fluid and application method of fracturing fluid
  • Thickening agent, fracturing fluid, preparation method of fracturing fluid, gel breaking method of fracturing fluid and application method of fracturing fluid

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preparation example Construction

[0064] Such as figure 1 Shown, the present invention also provides a kind of preparation method of thickener, comprises the following steps:

[0065] 1) stirring and mixing distilled water, fluorocarbon nonionic surfactant, cocamide betaine, and olefin sulfonate to obtain a first mixed solution;

[0066] 2) Then add nano-SiO to the first mixed solution 2 and graphene to obtain a second mixed solution, which is continuously stirred and oscillated to complete the preparation.

[0067] Preferably, in step 1) and step 2), each stirring speed is 2800r / min-3000r / min, each stirring time is 3min-5min, and the shaking time is 3min-5min.

[0068] Preferably, in step 2), the second mixed liquid is a homogeneous liquid or a liquid with precipitation, and the pH of the liquid is 4-8.

[0069] The present invention also provides a fracturing fluid, based on the mass of the fracturing fluid, the fracturing fluid comprises:

[0070] Mass percentage is the potassium chloride of 1.0%;

[0...

Embodiment 1

[0090] In this example, Well L49, a tight oil reservoir in the Chang 7 group in the Ordos Basin, is taken as an example. The specific implementation process is as follows:

[0091] Step 1: Prepare 93.8% distilled water, add 1% fluorocarbon non-ionic surfactant, 2% cocamide betaine, 1% olefin sulfonate and mix well; then slowly and evenly add 1.5% of the particle size range of 16nm nano-SiO 2 , 0.7% graphene, continuously stirring and vibrating to disperse until a surfactant-type thickener is obtained. During the preparation process, the stirring rate was 3000 r / min, and the stirring and vibration time was 4 minutes; the prepared thickener was homogeneous liquid, without precipitation, and had a pH value of 6.

[0092] Step 2: Take 250mL of clear water and put it into a plastic bottle, add 4mL of surfactant-type thickener, cover it upside down, shake it quickly after 30 seconds and count the time, when the liquid can form tongue-like fracturing fluid. To determine the optimal...

Embodiment 2

[0099] This example takes Well O33 in a tight oil reservoir in Songliao Basin as an example, and the specific implementation process is as follows:

[0100] Step 1: Prepare 89% distilled water, add 2% fluorocarbon nonionic surfactant, 4% cocamide betaine, 2% olefin sulfonate and mix well; then slowly and evenly add 2% nanometer particles with a particle size range of 17nm SiO 2 , 1% graphene, continuously stirring and vibrating to disperse until a surfactant-type thickener is obtained. During the preparation process, the stirring rate was 2800 r / min, and the stirring and vibration time was 4 minutes; the prepared thickener was homogeneous liquid, without precipitation, and had a pH value of 7.

[0101] Step 2: Take 300mL of clear water and put it into a plastic bottle, add 5mL of surfactant-type thickener, cover it upside down, shake it quickly after 30 seconds and count the time, when the liquid can form tongue-like fracturing fluid. To determine the optimal thickener dosag...

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Abstract

The invention discloses a thickening agent, a fracturing fluid, a preparation method of the thickening agent, a gel breaking method of the fracturing fluid and an application method of the fracturing fluid, and the thickening agent comprises the following components in percentage by mass: 1-2% of nano SiO2; graphene with a mass percentage of 0.5%-1%; a fluorocarbon nonionic surfactant with a mass percentage of 1%-2%; cocamidopropyl betaine with a mass percentage of 2%-4%; 1%-2% by mass of olefin sulfonate; the fracturing fluid comprises the following components in percentage by mass: 1.0% of potassium chloride, 1.0% of potassium chloride, 1.0% of potassium chloride, 1.0% of potassium chloride and the balance of distilled water. The mass percent of the thickening agent is 0.1%-3%; and the balance of liquid preparation water. The thickening agent is used for replacing guanidine gum in fracturing fluid in the prior art, and the problems that the fracturing fluid is high in viscosity and does not have the function of promoting imbibition oil extraction and flocculent precipitates are formed after gel breaking can be solved.

Description

technical field [0001] The invention relates to the technical field of fracturing fluid, in particular to a thickener, a fracturing fluid and a preparation method thereof, a gel breaking method and an application method of the fracturing fluid. Background technique [0002] The recoverable reserves of tight oil in my country are 30.1 billion tons, accounting for about 40% of the recoverable oil resources. The exploitation potential is huge, and it will be a more realistic energy replacement resource in the future. "Fracture network fracturing + imbibition oil recovery" is a new attempt to effectively develop tight oil reservoirs. Fracture network fracturing uses high-pressure pumps to inject fracturing fluid into the reservoir with a displacement exceeding the reservoir absorption. When the net extension pressure is greater than the sum of the difference between the two horizontal principal stresses and the tensile strength of the rock, branch fractures are likely to occur i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/66C09K8/68E21B43/267E21B43/27
CPCC09K8/665C09K8/68C09K8/602E21B43/267E21B43/27C09K2208/10
Inventor 刘雄周德胜张洋王海洋黄海刘娅菲高千张衍君
Owner XI'AN PETROLEUM UNIVERSITY
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