Step type pulse circulation temporary plugging complex fracture network fracturing method for deep low-permeability reservoir

A pulse-circulating, step-type technology, applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as difficulty in forming complex fracture networks, reduce the number of operations, save fracturing costs, and improve fracturing. The effect of crack transformation efficiency

Pending Publication Date: 2021-01-22
CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a deep reservoir pulse cycle temporary plugging complex fracture network fracturing method to form complex fracture networks in deep low-permeability reservoirs and overcome the difficulty in forming complex fracture networks in existing deep low-permeability reservoir hydraulic fracturing The problem with complex seam networks

Method used

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  • Step type pulse circulation temporary plugging complex fracture network fracturing method for deep low-permeability reservoir
  • Step type pulse circulation temporary plugging complex fracture network fracturing method for deep low-permeability reservoir
  • Step type pulse circulation temporary plugging complex fracture network fracturing method for deep low-permeability reservoir

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Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1 adopts the method of the present invention to carry out fracturing

[0040] Specifically include the following steps:

[0041] Step 1, surface and wellbore preparation: prepare the first surface fracturing vehicle group, the second surface fracturing vehicle group, supporting tools and fracturing fluid, and perform well drilling and well cleaning operations.

[0042] Step 2, perforation operation: use coiled tubing to run the connected downhole pulse hydraulic energy generation tool into the designated perforation section, and use the first ground fracturing crew to provide 120MPa pressure and 0.8m 3 The first fluid with displacement per minute makes the downhole pulsed hydraulic energy generating tool with bottom seal generate ultra-high pressure pulsed water jet, and the pressure of the first fluid increases to 200-250MPa to complete the perforation.

[0043] Step 3, Reservoir initiation: use the second ground fracturing unit to pump 1.0-3.0m 3 / min low...

Embodiment 2

[0050] Embodiment 2 adopts the method of the present invention to carry out fracturing

[0051] Specifically include the following steps:

[0052] Step 1, surface and wellbore preparation: prepare the first surface fracturing vehicle group, the second surface fracturing vehicle group, supporting tools and fracturing fluid, and perform well drilling and well cleaning operations.

[0053] Step 2, perforation operation: use coiled tubing to run the connected downhole pulse hydraulic energy generation tool into the designated perforation section, and use the first ground fracturing unit to generate downhole pulse hydraulic energy with bottom seal according to the predetermined perforation plan. The generation tool provides 80~140MPa pressure, 0.2~1.0m 3 The first fluid with a displacement of 1 / min forms an ultra-high pressure pulsed abrasive water jet downhole, and the pressure of the first fluid increases to 200-250 MPa to complete the perforation.

[0054] Step 3, Reservoir in...

Embodiment 3

[0061] Embodiment 3 adopts the method of the present invention to carry out fracturing

[0062] Include the following steps:

[0063] Step 1, surface and wellbore preparation: prepare the first surface fracturing vehicle group, the second surface fracturing vehicle group, supporting tools and fracturing fluid, and perform well drilling and well cleaning operations.

[0064] Step 2, perforation operation: use coiled tubing to run the connected downhole pulse hydraulic energy generation tool into the designated perforation section, and use the first ground fracturing unit to generate downhole pulse hydraulic energy with bottom seal according to the predetermined perforation plan. The generation tool provides 80~140MPa pressure, 0.2~1.0m 3 The first fluid with a displacement of 1 / min forms an ultra-high pressure pulsed abrasive water jet downhole, and the pressure of the first fluid increases to 200-250 MPa to complete the perforation.

[0065] Step 3, Reservoir initiation: use...

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Abstract

The invention belongs to the field of petroleum and natural gas fracturing transformation, and relates to a step type pulse circulation temporary plugging complex fracture network fracturing method for a deep low-permeability reservoir. The method includes the steps of ground and borehole preparation; perforation; cracking; complex fracture network generation; sand adding; temporary plugging; circulation pulse fracturing and the like. A pulse hydraulic energy generation tool with a bottom seal is matched, and a complex fracture network is formed in the deep reservoir through pulse circulationimpact fracturing, fatigue damage and temporary plugging steering, so that the problem that the complex fracture network is difficult to form in the deep reservoir is solved, the induced microseism amplitude is reduced under the low crack initiation fracturing condition, and the fracturing transformation operation efficiency, effectiveness and earthquake safety are improved. The step type pulse circulation temporary plugging complex fracture network fracturing method for the deep low-permeability reservoir is also suitable for repeated fracturing transformation of the low-permeability reservoir.

Description

technical field [0001] The invention relates to the technical field of fracturing reconstruction of low-permeability reservoirs, in particular to a fracturing method for pulse circulation temporary plugging of complex fracture networks in deep reservoirs. Background technique [0002] The exploration and development of low-porosity and low-permeability reservoirs has become an important direction for the exploration and development of oil and gas resources. Hydraulic fracturing technology is the main technical means to realize the development of such resources, and shale reservoirs are such low-porosity and low-permeability reservoirs. typical layer. At present, the hydraulic fracturing technology for shale reservoirs shallower than 3500m has achieved effective and economical development, and the hydraulic fracturing technology for shale reservoirs deeper than 3500-4500m has also made great breakthroughs; while the hydraulic fracturing technology for shale reservoirs deeper ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B33/13
CPCE21B33/13E21B43/26E21B43/261E21B43/267
Inventor 陆朝晖贺培贾云中刘洪邓智欧阳黎明袁勇
Owner CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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