Device and method for evaluating rheological properties of carbon dioxide dry-method fracturing fluid

A technology of dry fracturing fluid and carbon dioxide, which is applied in the direction of measuring devices, flow characteristics, instruments, etc., can solve the problems that the measurement accuracy cannot meet the requirements, the viscosity is low, and the rheological parameters of carbon dioxide fracturing fluid cannot be directly measured, reaching The device structure and operation method are simple, the measurement data accuracy is high, and the data is reliable.

Active Publication Date: 2017-08-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that due to the extremely low viscosity of liquid carbon dioxide and supercritical carbon dioxide (about 0.02mPa·s), the measurement accuracy of many rheological measurement equipment cannot meet the requirements, and the problem that the rheological parameters of carbon dioxide fracturing fluid cannot be directly measured

Method used

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  • Device and method for evaluating rheological properties of carbon dioxide dry-method fracturing fluid

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Embodiment 1

[0028] In order to solve the problem that due to the extremely low viscosity of liquid carbon dioxide and supercritical carbon dioxide (about 0.02 mPa·s), the measurement accuracy of many rheological measurement equipment cannot meet the requirements, and the rheological parameters of carbon dioxide fracturing fluid cannot be directly measured, such as figure 1 As shown, this embodiment provides a device for evaluating the rheological properties of carbon dioxide dry fracturing fluid, including a carbon dioxide booster system, a viscosity raising agent injection system, a vacuum pump 9 and a rotational rheometer 13, and also includes a six-way valve 6, The four valve ports of the six-way valve 6 are respectively connected to the carbon dioxide pressurization system, the viscosity raising agent injection system, the vacuum pump 9 and the rotational rheometer 13 through pipelines, and the remaining two valve ports are respectively connected to the pressure gauge 7 and the vent val...

Embodiment 2

[0033] On the basis of Example 1, the carbon dioxide pressurization system includes a carbon dioxide gas cylinder 1, a cooler 2, a buffer container 3 and a booster pump 4 connected through pipelines in sequence, and the booster pump 4 is connected with the six-way valve 6 through pipelines , the pipeline is connected with a mass flow meter 5 in series.

[0034] After the carbon dioxide in the carbon dioxide cylinder 1 is cooled by the cooler 2, it enters the buffer container 3 to obtain liquid carbon dioxide, and then pressurizes 4 through the booster pump, and the mass flow meter 5 is used to measure the quality of carbon dioxide entering the rotational rheometer 13, The pressurized liquid carbon dioxide enters the rotational rheometer 13 .

Embodiment 3

[0036] On the basis of Example 1, the viscosity raising agent injection system includes a viscosity raising agent storage tank 10 and a high-pressure metering pump 11 connected by pipelines, and the high-pressure metering pump 11 is connected to the six-way valve 6 by pipelines.

[0037] Put a certain amount of viscosity lifting agent into the viscosity lifting agent storage tank 10, the valve connected to the pressure gauge 7 in the six-way valve 6 is fully open, and the rest of the valves are in the closed state, open the vent valve 8, and wait until the venting pipeline flows out of the viscosity lifting agent. After dispensing, close the vent valve 8, turn on the high-pressure metering pump 11, open the valve in the six-way valve 6 connected with the coaxial cylinder measuring system 14 on the rotational rheometer 13, and inject the viscosity raising agent into the coaxial cylinder measuring system 14 in.

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Abstract

The invention provides a device and a method for evaluating rheological properties of a carbon dioxide dry-method fracturing fluid. The method comprises a carbon dioxide pressurization system, a tackifying agent injection system, a vacuum pump and a rotational rheometer and further comprises a six-way valve, wherein four valve ports of the six-way valve are connected with the carbon dioxide pressurization system, the tackifying agent injection system, the vacuum pump and the rotational rheometer through pipelines, the other two valve ports are connected with a pressure meter and an emptying valve through pipelines respectively, and the rotational rheometer is further connected with an air compressor, a computer and a temperature controller. The device is simple in structure and high in automation degree and adopts a simple operation method, measurement of parameters of the rheological properties of the carbon dioxide dry-method fracturing fluid in different experiments under higher pressure and in the wider temperature range is realized, the accuracy of measured data is high and data are reliable. Accurate rheological data and curves acquired with the device and the method facilitate further research of the rheological law, and theoretical data are provided for carbon dioxide dry-method fracturing design and construction.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas stimulation and reformation, and specifically relates to a device and method for evaluating the rheological properties of carbon dioxide dry fracturing fluid, which are used for studying the rheological performance parameters of carbon dioxide dry fracturing fluid under different experimental conditions. Background technique [0002] With the increasing proportion of unconventional oil and gas reservoirs such as shale oil, coalbed methane, shale gas and ultra-low permeability tight sandstone gas, at the same time, due to the extremely poor physical properties of such oil and gas reservoirs, it is difficult to extract them by conventional mining techniques , and the economic benefit is poor. Fracturing stimulation technology is an inevitable choice for the exploitation of unconventional oil and gas reservoirs. However, conventional hydraulic fracturing technology has problems suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/14
CPCG01N11/14Y02P90/70
Inventor 周然李勇宋振云唐冬珠荆建春李志航张承武汪小宇王玉功杨发许伟星陈迎花樊庆缘孟庆聪李文彬尹虎琛
Owner BC P INC CHINA NAT PETROLEUM CORP
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