Device and method for measuring supercritical carbon dioxide fracturing fluid throttling coefficient under different viscosities

Abstract

The present invention relates to a device and method for measuring supercritical carbon dioxide fracturing fluid throttling coefficient under different viscosities. The device for measuring supercritical carbon dioxide fracturing fluid throttling coefficient under different viscosities comprises a supercritical carbon dioxide fracturing fluid throttling coefficient measurement system and a supercritical carbon dioxide fracturing fluid viscosity adjustment apparatus; the supercritical carbon dioxide fracturing fluid throttling coefficient measurement system determines throttling coefficient of a high temperature and high pressure supercritical carbon dioxide fracturing fluid, and the supercritical carbon dioxide fracturing fluid viscosity adjustment apparatus determines viscosity of the high temperature and high pressure supercritical carbon dioxide fracturing fluid.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to Chinese Application No. 201510641282.8, filed on Sep. 30, 2015, entitled “Device for measuring supercritical carbon dioxide fracturing fluid throttling coefficient under different viscosities”, which is specifically and entirely incorporated by reference.TECHNICAL FIELD[0002]The present invention belongs to the technical field of unconventional oil and gas exploitation, and specifically relates to a device and method for measuring supercritical carbon dioxide fracturing fluid throttling coefficient under different viscosities.BACKGROUND[0003]Unconventional natural gas source includes coal-bed gas, shale gas, tight sandstone gas and water-soluble gas. Currently, the unconventional oil and gas resources have been played an important role in the global energy structure. In this country, the unconventional oil and gas resources have rich reserves, wide distribution and broad development prospects. The techn...

AI Technical Summary

Benefits of technology

The present invention can measure the throttling coefficient of a supercritical carbon dioxide fracturing fluid in a wide range of pressure and temperature, and can identify the rules of how the fluid's throttling effect changes with different viscosities. The apparatus and method are simple to operate and the feasibility is high.

Problems solved by technology

However, the unconventional oil and gas resources are difficult to exploit and basically have characteristics of low porosity, low permeability, low pressure, and compact rock formation.

The conventional water base fracturing causes large damage to the shale oil and gas reservoir and causes severe secondary pollution in the solution, and severely affects the capacity increasing revamping effect of the solution, specifically in the following aspects: (1) damage to the stratum caused by the fracturing fluid polymer; (2) damage caused to the stratum due to unreasonable drainage speed; and (3) damage easily caused to the water sensitive stratum.

The fracturing fluid flows by the injection fracturing apparatus to create throttling effect, causing the temperature to reduce and affecting the physical property and injection fracturing effect of the fracturing fluid.

Currently, with the influence of the temperature, pressure and the viscosity of the fracturing fluid, the rules of the throttling effect of the supercritical carbon dioxide fracturing fluid are relatively complex with few test data.

There is no systematic explanation for the principle of the throttling process, so that it is a difficulty in the supercritical carbon dioxide injection fracturing exploitation of the unconventional oil and gas reservoir.

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