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A Deep Explosion Fracturing Method in a Radial Slim Hole

A technology of explosive fracturing and wellbore, which is applied in the direction of wellbore/well components, earthwork drilling and production, and mining fluid, etc. It can solve the problems of inability to effectively transform reservoirs near the wellbore, high fluidity of fluid explosives, and instability of liquid explosives To achieve the effect of improving seepage characteristics of reservoir, lower drilling cost and improving seepage resistance

Active Publication Date: 2021-11-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The construction section of this invention technology is a horizontal section of 100-1000 meters. During the construction process, soft materials need to be lowered into the target reservoir to transport solid gunpowder, which increases the construction workload and cannot effectively transform the near-wellbore reservoir with concentrated pressure drop.
[0005] There are also technical inventions that use liquid explosives and timing detonators to implement deflagration and detonation in sidetracking drilling, but fluid explosives have too high fluidity and relatively low viscosity to achieve slug filling in slim holes
In addition, the liquid explosive is unstable and is easy to mix with the liquid in the wellbore, and it is easy to infiltrate in the small wellbore, which requires high construction operation

Method used

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  • A Deep Explosion Fracturing Method in a Radial Slim Hole
  • A Deep Explosion Fracturing Method in a Radial Slim Hole
  • A Deep Explosion Fracturing Method in a Radial Slim Hole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A deep burning fracturing method for radially small wells in the fracturing modification of oil and gas lamination, such as figure 1 , figure 2 As shown, the use of emulsion explosives pumps into the target small well eye section, and the steps are as follows:

[0043] Step 1, in the wellbore sleeve, add the pressure detonator, seal the oil pipe shoe. Pressure detonators use shear pins to fix the hitter detonator. The pressure startup pressure is set according to the emulsified explosive pump pressing pressure used in the construction.

[0044] Step 2, add the packer, and the construction target radial small oil jet space, the upper and lower packer distance is 1m distance radial small well eye oyster tube window.

[0045]Step 3, the ground pump group pumps the isolation liquid. Pumping the isolation liquid, the impurities in the tubing can be cleaned, and the emulsion explosives are contaminated. At the same time, the isolation fluid is injected into the tubing shoe to the...

Embodiment 2

[0064] A deep blast fracturing method for radially small wellbore in the oil-gas layer fracturing modification, as described in Example 1, in the first and lower packer, the upper and lower packer The distance from the tubing window is 0.8m.

Embodiment 3

[0066] A deep blast fracturing method for radially small wellbore in the oil-gas layer fracturing modification, as described in Example 1, in the first and lower packer, the upper and lower packer The distance of the tubing window is 1.2m.

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Abstract

The invention relates to a method for deep combustion explosion fracturing in radial slimholes, which belongs to the technical field of combustion explosion fracturing. After the target well forms a radial slimhole with a certain length and diameter in the reservoir through sidetracking slimhole technology, the The pressure initiator is lowered into the tubing shoe, the spacer fluid pump injection, the emulsion explosive pump injection, the displacement fluid pump injection, the packer seals the annular space of the upper and lower oil casings in the radial slim hole window, the displacement fluid pump injection, and the pressure sensitive detonator. Lift it to the slim hole window, and lower the packer to seal the upper and lower casing annular spaces of the tubing window. The installation of the pressure initiator includes the design of the initiator type and the design of the pressure sensitivity. The pumping phase includes the design of the amount of emulsion explosive, the design of the displacement fluid type and the design of the pumping pressure. The invention is reasonable in design, convenient in construction and simple in operation, and can realize laying and controllable ignition of gunpowder in the deep part of the slim hole, and realize deflagration fracturing inside the slim hole.

Description

Technical field [0001] The present invention relates to a deep blasting fracturing process for petroleum and natural gas reservoir fracturing modification, in the field of fuel-proof fracturing technology. Background technique [0002] With the development of my country's oil industry, most oil and gas fields entered the production in production, and the output also decreased significantly. Burning fracturing technology has become a simple and effective method for improving formation permeability with its simple construction, low cost. However, the effective range of the current burning fracturing construction is limited to the proximal well belt, and it is not possible to effectively improve the formation of formation of wellbore away from the wellbore and have certain limitations. Hydraulic fracturing and acidification technology can increase the length of the crack, but due to its high requirements for the construction site, there are many restrictions, and the cracks formed c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/263
CPCE21B43/261E21B43/263
Inventor 吴飞鹏范贤章刘静丁乾申杨维
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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