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Device and method for leading liquid nitrogen to barefoot well

An open hole and liquid nitrogen technology, applied in the direction of wellbore/well components, earthwork drilling, production fluid, etc., can solve the problems of reservoir pollution, high crack opening pressure in fracturing construction, etc., to avoid pollution and facilitate production and manufacturing and operational use, the effect of simple structure

Inactive Publication Date: 2018-01-19
XI'AN PETROLEUM UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0004] The perforating bullets and perforating fluid used in conventional open-hole perforation will not only pollute the reservoir to a certain extent, but also cause excessive crack opening pressure during fracturing construction. Acid solution to unblock, and acid solution will further pollute the reservoir

Method used

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  • Device and method for leading liquid nitrogen to barefoot well
  • Device and method for leading liquid nitrogen to barefoot well
  • Device and method for leading liquid nitrogen to barefoot well

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Embodiment Construction

[0034] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0035] 1. The device for introducing liquid nitrogen into the open hole

[0036] refer to figure 1 , the device for introducing liquid nitrogen into an open-hole well of the present invention includes: a liquid nitrogen storage tank 7, a sealing liquid storage tank 9, a pressurized delivery device 8, a delivery pipeline 6, a serial pipe joint 5, a rear sealer 4, a liquid Nitrogen spray gun 3, front sealer 2 and seeker head 1.

[0037] refer to Figure 8 , the serial pipe joint 5 has two liquid passages, a liquid nitrogen passage 51 and a sealing liquid passage 52, one end of these two liquid passages is respectively connected with the pipeline for conveying liquid nitrogen and the pipeline for conveying sealing liquid, and the other end is respectively sealed with the rear The liquid nitrogen channel 46 and the sealing liquid inlet 42 ...

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Abstract

The invention discloses a device and method for leading liquid nitrogen to a barefoot well. The device includes a liquid nitrogen storage tank, a sealing liquid storage tank, a supercharging conveyingdevice, a conveying pipeline, a back sealing device, a liquid nitrogen spray gun and a front sealing device; the liquid nitrogen storage tank and the sealing liquid storage tank are connected to thesupercharging conveying device; the supercharging conveying device is connected to the back sealing device through the conveying pipeline; a liquid nitrogen inlet of the liquid nitrogen spray gun anda sealing liquid inlet of the front sealing device are connected to a liquid nitrogen outlet and a sealing liquid outlet of the back sealing device respectively; and the front sealing device seals theother end of the liquid nitrogen spray gun. The beneficial effects of the invention are that the device is simple in structure and is easy to operate and use; (2) reservoir pollution can be avoided through liquid nitrogen perforation; and (3) reservoir rocks are soaked in the liquid nitrogen to form more fracture nets, and then the fracturing effect can be improved.

Description

technical field [0001] The invention relates to a device and a method for introducing liquid nitrogen into an open hole well, belonging to the technical field of oil and gas field development. Background technique [0002] Low-permeability and ultra-low-permeability oilfields are widely distributed in my country, and their effective development is the key to increasing and stabilizing oilfield production. [0003] Low-permeability oil and gas need to be fractured to establish industrial production capacity, so the effect of fracturing often affects the development effect and production capacity of oil wells. [0004] The perforating bullets and perforating fluid used in conventional open-hole perforation will not only pollute the reservoir to a certain extent, but also cause excessive crack opening pressure during fracturing construction. Acid solution is used to deblock, and acid solution will further pollute the reservoir. Contents of the invention [0005] In order to...

Claims

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Application Information

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IPC IPC(8): E21B43/114E21B43/119E21B43/26
Inventor 韩继勇许永华
Owner XI'AN PETROLEUM UNIVERSITY
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