A multi-stage liquid co 2 Phase change composite fracturing stimulation system and method

A composite fracturing and CO2 technology, applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of difficult fracturing sand-carrying, short loading time, complicated construction, etc. Improve flow conductivity and enhance the effect of driving pressure

Active Publication Date: 2022-04-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the construction of this method is relatively complicated, the risk of explosive blasting is high, the loading time is short, and the cementing quality is easily affected; and the single liquid CO 2 It is difficult to carry sand in fracturing, and it is difficult to effectively support fractures, which seriously affects the effect of fracturing stimulation. In addition, it is difficult to flow back water-based fracturing fluid during conventional hydraulic fracturing, which is easy to damage the reservoir

Method used

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  • A multi-stage liquid co <sub>2</sub> Phase change composite fracturing stimulation system and method
  • A multi-stage liquid co <sub>2</sub> Phase change composite fracturing stimulation system and method
  • A multi-stage liquid co <sub>2</sub> Phase change composite fracturing stimulation system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as Figure 1~4 As shown, a multistage liquid CO based 2 Composite fracturing stimulation system with phase change, including liquid CO 2 Injection unit, conventional fracturing fluid injection unit, underground blast fracturing unit and surface control unit; said liquid CO 2 The injection unit and the conventional fracturing fluid injection unit are connected to the underground blasting and fracturing unit through the fracturing string 13; the ground control unit includes a ground control device 9, and the ground control device 9 is connected to the underground blasting and fracturing unit through a cable 28. connect;

[0043] The liquid CO 2 Injection unit includes liquid CO 2 Tank 1, liquid CO 2 Pressurization equipment 2, gas-liquid separation equipment 3, high-pressure pumping equipment 4; the liquid CO 2 Tank 1, liquid CO 2 Pressure boosting equipment 2, gas-liquid separation equipment 3, and high-pressure pumping equipment 4 are connected in sequence t...

Embodiment 2

[0053] Based on multistage liquid CO as described in Example 1 2 Phase change composite fracturing stimulation system, the difference is that the multi-stage liquid CO 2 In the phase change blasting device 15, four liquid CO 2 Phase change generator. The liquid CO 2 The pipe lengths of the phase change generators are 800mm, 600mm, 400mm and 400mm respectively.

Embodiment 3

[0055] Based on multistage liquid CO as described in Example 1 2 Phase change composite fracturing stimulation system, the difference is that the multi-stage liquid CO 2 Phase change blasting device 15 is provided with 2 liquid CO 2 Phase change blasting device. The liquid CO 2 The tube lengths of the phase change blasting devices are 800mm and 600mm respectively.

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Abstract

The invention relates to a multi-stage liquid CO 2 Phase change composite fracturing reconstruction system and method, the composite fracturing stimulation system includes liquid CO 2 Injection unit, conventional fracturing fluid injection unit, underground blast fracturing unit and surface control unit; said liquid CO 2 The injection unit and the conventional fracturing fluid injection unit are connected to the underground blasting and fracturing unit through the fracturing string; the ground control unit is connected to the underground blasting and fracturing unit through cables; method of cracking. The composite fracturing reconstruction system provided by the present invention passes through multi-stage CO 2 Phase change and one-pass string achieve CO 2 Pre-amplification, make full use of CO 2 The safety of phase change blasting can effectively reduce the fracture pressure of rocks in low-permeability or deep tight oil and gas reservoirs; the driving pressure of underground crude oil can be increased by 2-5 MPa, and the flowback rate of fracturing fluid can reach more than 80% after 4 hours of fracturing. It can be extended for 6 to 18 months.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering, in particular to a multi-stage liquid CO 2 Phase change composite fracturing stimulation system and method. Background technique [0002] Fracturing is a key technology for oilfield stimulation and stimulation. For low-permeability or deep tight oil and gas reservoirs with abnormally high fracture pressure and severe plugging, conventional fracturing methods are difficult to initiate rock fractures. Every year, there are some reservoirs that fail to be constructed due to abnormal pressure, resulting in a waste of a lot of manpower and financial resources. Therefore, it is necessary to provide effective technical support for low-permeability or tight oil and gas reservoirs with abnormally high fracture pressure and severe blockage. [0003] In recent years, liquid CO 2 Due to the advantages of low damage and easy flowback, dry fracturing has received extensive attention and resear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267E21B49/00
CPCE21B43/267E21B49/00
Inventor 罗明良史博晶吴飞鹏战永平贾晓涵杨玉玲
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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