High pressure nitrogen-low temperature liquid nitrogen composite fracturing method for oil and gas production increasing

A technology of low-temperature liquid nitrogen and high-pressure nitrogen, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of impossibility of proppant entering, improve the effect of fracturing and increase production, improve self-supporting ability, improve Effect of Reservoir Fracture Degree

Active Publication Date: 2019-05-03
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Due to the low viscosity of nitrogen, it cannot carry a large amount of proppant into the formation like water-based fracturing fluid to form effective propped fractures

Method used

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  • High pressure nitrogen-low temperature liquid nitrogen composite fracturing method for oil and gas production increasing
  • High pressure nitrogen-low temperature liquid nitrogen composite fracturing method for oil and gas production increasing
  • High pressure nitrogen-low temperature liquid nitrogen composite fracturing method for oil and gas production increasing

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] A high-pressure nitrogen-low temperature liquid nitrogen composite fracturing method for increasing oil and gas production of the present invention comprises the following steps:

[0034] 1) if figure 1 As shown, a fracturing tool 16 with a packer 17 is lowered into the interval to be stimulated in the wellbore 14 through the oil pipe 12, and then the wellhead is installed and connected to the surface equipment; The nitrogen cylinder group 1, the gas compressor 3, the gas booster 4, the heater 5 and the nitrogen valve 6, and the liquid nitrogen container 8, the liquid nitrogen plunger pump 9 and the liquid nitrogen connected in sequence through the liquid nitrogen injection pipeline 11 The valve 10, the nitrogen injection pipeline 7 and the liquid nitrogen injection pipeline 11 are respectively connected with the oil pipe 12; ...

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Abstract

The invention discloses a high pressure nitrogen-low temperature liquid nitrogen composite fracturing method for oil and gas production increasing. Formation rock is fractured through high pressure nitrogen to form large-scale artificial fractures, then ultralow temperature liquid nitrogen is injected into main fractures, the ultralow temperature characteristic of the liquid nitrogen is utilized to assist in fracturing rock on the wall faces of the main fractures, thus the rock generates secondary fractures which are perpendicular to the main fractures, the self-supporting capacity of the mainfractures is improved, the fracturing degree of a reservoir is increased, closing of the fractured main fracture is prevented, and thus efficient development of the reservoir is achieved. In the whole fracturing process, the high temperature and high pressure nitrogen and the low temperature liquid nitrogen are alternately injected for multiple times, the disadvantage that during conventional fracturing, the reservoir mainly generates a single main fracture is overcome, large-volume network fractures are formed in the reservoir advantageously, and the fracturing production increasing effect of the oil and gas reservoir is improved effectively.

Description

technical field [0001] The invention relates to a waterless fracturing method, in particular to a high-pressure nitrogen-low temperature liquid nitrogen composite fracturing method for oil and gas stimulation, and belongs to the technical field of oil and gas stimulation. Background technique [0002] Currently, unconventional natural gas resources such as shale gas have become an important part of the world's energy supply. The natural production capacity of unconventional reservoirs is extremely low, and generally requires hydraulic fracturing to realize industrial exploitation. However, the quality of this type of reservoir is poor, and it is easily damaged by foreign fluids. For example, water retention and swelling of clay minerals can impede gas flow after fracturing is complete. The development of unconventional natural gas will also involve problems such as excessive consumption of water resources and pollution. For example, the water consumption of a single well f...

Claims

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Application Information

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IPC IPC(8): E21B43/26
Inventor 蔡承政高峰任科达刘江峰杨玉贵张志镇李庆华
Owner CHINA UNIV OF MINING & TECH
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