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A kind of ultra-low water content carbon dioxide fracturing fluid and its preparation method

A carbon dioxide and fracturing fluid technology, applied in the field of fracturing fluid, can solve problems such as retention, affecting post-fracturing stimulation, fracturing fluid thickening and sand-carrying performance difficulties, etc., to increase viscosity, increase construction sand ratio, and thicken significant effect

Active Publication Date: 2020-08-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unconventional reservoirs represented by shale oil and gas require large-scale volume fracturing to achieve economic development, which makes up for the energy demand to a certain extent. However, on the other hand, during the use of water-based fracturing fluid, the Problems such as the environment, flowback fluid treatment, and the large demand for water in conventional fracturing limit the application of hydraulic fracturing technology to a certain extent. Many experts and scholars at home and abroad have questioned the commonly used water-based fracturing fluid. Opening the reservoir produces cracks, but at the same time, water is prone to self-absorption in the reservoir, so that the water that opens the reservoir is also trapped in it, resulting in a water lock effect that affects the effect of post-fracturing stimulation.
However, there are technical difficulties in fracturing fluid thickening and sand-carrying performance using liquid carbon dioxide fracturing fluid technology

Method used

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  • A kind of ultra-low water content carbon dioxide fracturing fluid and its preparation method
  • A kind of ultra-low water content carbon dioxide fracturing fluid and its preparation method

Examples

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Effect test

Embodiment 1

[0031] This embodiment provides an ultra-low water content carbon dioxide foam / carbon dioxide anhydrous fracturing fluid, which includes: 10% liquid water, 0.01% hydrophobic group polyacrylamide GRF-1H based on its total weight of 100%. , 40% gaseous carbon dioxide, and the balance liquid carbon dioxide.

[0032] The ultra-low water content carbon dioxide foam / carbon dioxide fracturing fluid of this embodiment can be prepared as follows:

[0033] At room temperature, the hydrophobic group polyacrylamide GRF-1H is uniformly dispersed in water according to the proportion, and after stirring for 15 minutes at a temperature of 25°C, the GRF-1H solution is left in a water bath at a temperature of 30°C for 4 hours;

[0034] Mix the dissolved GRF-1H solution with carbon dioxide gas to form carbon dioxide foam;

[0035] Mix with liquid carbon dioxide in high pressure pipeline in proportion to obtain ultra-low water content carbon dioxide foam / carbon dioxide fracturing fluid.

[0036...

Embodiment 2

[0039] This embodiment provides an ultra-low water content carbon dioxide foam / nitrogen fracturing fluid, which includes: 10% liquid water, 0.02% hydrophobic group polyacrylamide GRF-1H, 40% based on its total weight of 100%. % nitrogen, and the balance liquid carbon dioxide

[0040] The ultra-low water content carbon dioxide foam / nitrogen fracturing fluid of this embodiment can be prepared as follows:

[0041] At room temperature, the hydrophobic group polyacrylamide GRF-1H is uniformly dispersed in water according to the proportion, and after stirring for 15 minutes at a temperature of 25°C, the GRF-1H solution is left in a water bath at a temperature of 30°C for 4 hours;

[0042] Mix the dissolved GRF-1H solution with carbon dioxide gas to form a carbon dioxide foam system;

[0043] Mix with nitrogen in high pressure pipeline in proportion to obtain ultra-low water content carbon dioxide foam / nitrogen fracturing fluid.

[0044] The fracturing performance test of the ultra...

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Abstract

The invention provides an ultra-low moisture carbon dioxide fracturing fluid and a preparation method of the ultra-low moisture carbon dioxide fracturing fluid. The ultra-low moisture carbon dioxide fracturing fluid comprises the following raw materials by 100% of the total mass of the ultra-low moisture carbon dioxide fracturing fluid: 3-10 wt% of water, 0.01-0.05 wt% of anionic polymer containing a hydrophobic group, 30-50 wt% of gaseous carbon dioxide or nitrogen, and the balance of liquid carbon dioxide. The invention further provides the preparation method of the fracturing fluid. The ultra-low moisture carbon dioxide fracturing fluid solves the technical problem of difficulties in thickening and sand carrying of the existing anhydrous fracturing fluid, and also solves the technical problem of high water consumption in the large-scale volume transformation process at the same time.

Description

technical field [0001] The invention relates to a fracturing fluid, in particular to an ultra-low water content carbon dioxide fracturing fluid, and belongs to the technical field of fracturing fluids. Background technique [0002] With the continuous development of unconventional reservoirs, the fracturing technology that can effectively develop reservoirs is becoming more and more important. Unconventional reservoirs represented by shale oil and gas require large-scale volume fracturing to achieve economic development, which makes up for the energy demand to a certain extent. However, on the other hand, during the use of water-based fracturing fluid, the Problems such as the environment, flowback fluid treatment, and the large demand for water in conventional fracturing limit the application of hydraulic fracturing technology to a certain extent. Many experts and scholars at home and abroad have questioned the commonly used water-based fracturing fluid. Opening the reserv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68E21B43/267E21B43/26
CPCC09K8/68C09K8/882E21B43/26E21B43/267
Inventor 崔伟香舒玉华卢拥军崔明月姚飞邱晓惠梁冲张合文晏军朱大伟
Owner PETROCHINA CO LTD
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