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dynamic filtration measuring device for liquid CO2/N2 two-phase system dry-method fracturing fluid under high pressure conditions and measuring method of device

A dry fracturing fluid and measurement device technology, applied in the direction of measurement devices, surface/boundary effects, instruments, etc., can solve problems such as low viscosity, high construction pressure, and complex state of the two-phase system

Inactive Publication Date: 2018-09-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the fracturing process, the construction pressure is generally high, and the liquid CO 2 / N 2 The state of the two-phase system is complex and the viscosity is low. The existing conventional fluid loss instrument cannot realize the liquid CO 2 / N 2 Measurement of fluid loss of two-phase system
[0003] Chinese patent CN104914012A discloses a carbon dioxide anhydrous fracturing fluid fluid loss test system and test method, which provides a test method for the carbon dioxide anhydrous fracturing fluid fluid loss, but only involves single-phase fluids, not liquid CO 2 / N 2 Explanation of the two-phase system

Method used

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  • dynamic filtration measuring device for liquid CO2/N2 two-phase system dry-method fracturing fluid under high pressure conditions and measuring method of device
  • dynamic filtration measuring device for liquid CO2/N2 two-phase system dry-method fracturing fluid under high pressure conditions and measuring method of device
  • dynamic filtration measuring device for liquid CO2/N2 two-phase system dry-method fracturing fluid under high pressure conditions and measuring method of device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A liquid CO under high pressure 2 / N 2 A two-phase system dry fracturing fluid dynamic fluid loss measurement device, the measurement device includes sequentially connected gas pressurization and circulation system, dynamic fluid loss core clamping system, filtrate collection and measurement system, and also includes a temperature control system 25 ;

[0048] It is characterized in that the gas pressurization and circulation system includes CO 2 Storage tank 1, cold box 2, booster pump 5, N 2 Storage tank 3, one-way valve 4, mixer 6, buffer tank 7, circulating pump 8, simulated crack 9, mass flow meter 10; the CO 2 The storage tank 1 is arranged inside the cold box 2, and is connected to the mixer 6 through the booster pump 5 to provide high-pressure liquid CO for the measuring device 2 ; The N 2 The storage tank 3 is connected to the mixer 6 through the one-way valve 4 to provide N for the measuring device 2 ; Liquid CO in the mixer 6 2 With N 2 Mixed to form liquid CO 2 / N...

Embodiment 2

[0053] Liquid CO under a high pressure condition as described in Example 1 2 / N 2 The two-phase system dry fracturing fluid dynamic fluid loss measurement device, the difference is that the dynamic fluid loss core clamping system includes a simulated fracture 9, a core 11, a core holder 12, a first differential pressure sensor 18, a second Two differential pressure sensors 24, the simulated crack 9 is vertically arranged in the core holder 12, the core 11 is horizontally arranged in the core holder 12, and the top end face of the core 11 is in line with the simulated Crack 9 is connected, liquid CO 2 / N 2 The two-phase system dry fracturing fluid is filtered through the simulated fractures 9 and enters the core 11 to simulate liquid CO 2 / N 2 The two-phase system dry fracturing fluid enters the fluid loss process of the formation rock matrix through the fracture wall. The first differential pressure sensor 18 is provided at the inlet end of the buffer tank 7, and the second diffe...

Embodiment 3

[0055] Liquid CO under a high pressure condition as described in Example 1 2 / N 2 The two-phase system dry fracturing fluid dynamic fluid loss measurement device, the difference is that the temperature control system 25 includes a low-temperature circulating water bath, a heating jacket, used to control the temperature of the experimental process, to ensure CO 2 In a liquid or supercritical state.

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Abstract

The invention discloses a dynamic filtration measuring device for liquid CO2 / N2 two-phase system dry-method fracturing fluid under high pressure conditions and a measuring method of the device, and belongs to the technical field of performance testing of liquid CO2 / N2 two-phase system dry-method fracturing fluid. The measuring device comprises a gas pressurization and circulation system, a dynamicfiltration core clamping system, a filtrate collection and metering system and a temperature control system; by means of the gas pressurization and circulation system, liquid CO2 and N2 are mixed andcircularly pass through the dynamic filtration core clamping system to simulate the process that the filtration of the liquid CO2 / N2 two-phase system dry-method fracturing fluid enters the stratum, and the filtrate collection and metering system meters experimental data; the temperature control system achieves temperature control over the measuring device. By means of the dynamic filtration measuring device, flowing of the liquid CO2 / N2 two-phase system dry-method fracturing fluid in cracks under the high pressure conditions and the filtration process of the fracturing fluid through a crack wall are accurately simulated, the filtration of the fracturing fluid is measured, the filtration coefficient is calculated, and basic parameters are provided for liquid CO2 dry-method fracturing design.

Description

Technical field [0001] The invention relates to a liquid CO under high pressure conditions 2 / N 2 Two-phase system dry fracturing fluid dynamic fluid loss measuring device and measuring method, which belong to liquid CO 2 / N 2 The technical field of two-phase system dry fracturing fluid performance testing. Background technique [0002] Liquid CO 2 / N 2 Two-phase system dry fracturing is based on liquid CO 2 And N 2 The formed anhydrous two-phase system is used as a stimulation technique for fracturing and reforming oil and gas reservoirs with fracturing fluid, in which liquid CO 2 For the external phase, N 2 For the inner phase. During fracturing, liquid CO 2 / N 2 The two-phase system is used as fracturing to hydraulically open the formation and carry sand to support the cracks. After the fracturing is completed, the temperature rises and the pressure drops, and liquid CO 2 Become gaseous, and N 2 Quickly and completely drain from the formation without leaving residues, it is a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/04
CPCG01N13/04
Inventor 李宾飞郑超柏浩李兆敏李爱山史大山吕其超许建国段永伟陈实
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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