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Shear thickening liquid, modified degradable fiber based thereon, preparation method and temporary blocking deflection fracturing method

A technology for degrading fibers and liquids, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., can solve problems such as low fracturing efficiency, less horizontal and vertical expansion, and single fracture network shape, and achieve increased friction, Conducive to temporary blockage, improve the effect of stability

Active Publication Date: 2019-01-18
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of the current conventional hydraulic fracturing technology is that it is often difficult to press out multi-level complex fracture networks in oil-gas-rich reservoirs. Most of the fracture networks formed have a single shape and less horizontal and vertical expansion. In the process, only one fracture can be opened, which has almost no effect on reservoir stimulation, and the fracturing efficiency is very low, which makes it difficult for oil and gas to migrate and produce, and the output after fracturing is not significantly improved

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  • Shear thickening liquid, modified degradable fiber based thereon, preparation method and temporary blocking deflection fracturing method
  • Shear thickening liquid, modified degradable fiber based thereon, preparation method and temporary blocking deflection fracturing method

Examples

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Effect test

Embodiment 1

[0048] In this example, Well A13, a tight reservoir in the Zaowan area of ​​Changqing Oilfield, is taken as an example. The previous hydraulic fracturing in Well A13 has not significantly transformed the reservoir through seismic monitoring, and the fractures are connected to natural fractures and undeveloped areas. Very poor, and the oil and gas recovery rate has not been significantly improved, so the temporary plugging diversion fracturing method provided by the present invention is used for secondary fracturing construction.

[0049] The specific process of construction is as follows:

[0050] Step 1: prepare shear thickening liquid STF, graphene (accounting for 1% of the total mass of shear thickening liquid STF) and carbon nanotubes (accounting for 2% of the total mass of shear thickening liquid STF) at a rotating speed of 550r Slowly and evenly add it into the dispersed phase formed by mixing PEG200 and PEG400 according to the mass ratio of 1:4 at a speed of 1 / min. Afte...

Embodiment 2

[0058] In this example, Well B32, a tight shale reservoir in the Ordos Basin, is taken as an example. The reservoir permeability of Well B32 is extremely low, the oil layer is thick, and the distribution range is uneven. It is suitable for using temporary plugging and diversion fracturing technology to construct complex fracture networks.

[0059] The specific process of construction is as follows:

[0060] Step 1: prepare the shear thickening liquid STF, graphene (accounting for 2% of the total mass of the shear thickening liquid STF) and carbon nanotubes (accounting for 2% of the total mass of the shear thickening liquid STF) at a speed of 600r Slowly and evenly add it to the dispersed phase formed by mixing PEG200 and PEG400 at a mass ratio of 1:2 at a speed of 1 / min. After the graphene and carbon nanotubes are added, add nano-SiO with a particle size of 450nm 2 (accounting for 45% of the total mass of the shear-thickening liquid STF); meanwhile, in the whole process of mix...

Embodiment 3

[0068] In this example, Well B64, a tight and heavy oil reservoir in the Ordos Basin, is taken as an example. The reservoir permeability of Well B64 is low, the oil viscosity is high, and the effect of conventional hydraulic fracturing is not obvious, so the temporary plugging and diversion fracturing technology is selected to construct complex fractures. network to increase the contact area between the reservoir and the oil well.

[0069] The specific process of construction is as follows:

[0070] Step 1: prepare the shear thickening liquid STF, graphene (accounting for 1.5% of the total mass of the shear thickening liquid STF) and carbon nanotubes (accounting for 1% of the total mass of the shear thickening liquid STF) at a speed of 650r Slowly and evenly add it to the dispersed phase formed by mixing PEG200 and PEG400 according to the mass ratio of 1:4 at a speed of 1 / min. After adding graphene and carbon nanotubes, add nano-SiO with a particle size of 80nm 2 (accounting ...

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Abstract

The invention relates to the field of petroleum engineering hydraulic fracturing, in particular to shear thickening liquid and a modified degradable fiber based thereon, a preparation method and a temporary blocking deflection fracturing method. The temporary blocking deflection fracturing method comprises: step 1, preparing the shear thickening liquid; step 2, modifying the degradable fiber DF-1;step 3, setting a fracturing packer and injecting prepad fluid to press and open a stratum; step 4, inject sand-carrying fluid mixed with the modified degradable fiber to fill a crack; step 5, injecting a fiber deflection agent solution for deflection and fracture forming; step 6, filling a new fracture with the sand-carrying liquid mixed with the modified degradable fiber, and then replacing forstopping pumping. A non-Newtonian fluid is utilized to modify the degradable fiber DF-1, so that a net structure formed by the fiber in the solution is more stable, and the temporary blocking abilityof the stratum crack is greatly enhanced; compared with the prior art, more deep branch seams can be formed, thus greatly improving the communication between old seams as well as natural cracks and unused reservoir areas, and achieving the suitability for popularization and application in low-permeability tight reservoirs.

Description

technical field [0001] The invention relates to the field of petroleum engineering hydraulic fracturing, in particular to a shear thickening liquid, a modified degradable fiber based on the same, a preparation method and a temporary plugging diversion fracturing method. Background technique [0002] With the acceleration of the exploration and development of unconventional oil and gas resources such as tight gas, shale gas and coalbed methane, unconventional oil and gas resources have become a hot spot in the world. Hydraulic fracturing technology is an effective means for the economic development of unconventional oil and gas. However, in order to form sand-filled fractures with high conductivity in the reservoir and greatly increase the production of oil and gas wells, it is necessary to press out multiple fractures in the formation to form a complex multi-level fracture network. The main disadvantage of the current conventional hydraulic fracturing technology is that it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/80C09K8/514E21B43/26E21B43/267
CPCC09K8/514C09K8/685C09K8/80C09K2208/08C09K2208/10E21B43/261E21B43/267
Inventor 周德胜王海洋李宪文马先林蔡文斌刘顺何明舫
Owner XI'AN PETROLEUM UNIVERSITY
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