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A kind of shear thickening liquid and its modified degradable fiber and its preparation method and temporary plugging diversion fracturing method

A fiber degradation and modification technology, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the problems of low fracturing efficiency, less horizontal and vertical expansion, and difficulty in oil and gas migration and production, and achieve increased friction. Large, improve stability, and is conducive to the effect of temporary blocking

Active Publication Date: 2021-02-26
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • 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

Method used

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  • A kind of shear thickening liquid and its modified degradable fiber and its preparation method and temporary plugging diversion fracturing method
  • A kind of shear thickening liquid and its modified degradable fiber and its preparation method and temporary plugging diversion fracturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0048]This example takes Well A13 in the tight reservoir of Zaowan District of Changqing Oilfield as an example. The hydraulic fracturing performed in Well A13 before has not significantly improved the reservoir after seismic monitoring, and the fractures are connected to natural fractures and unused areas. The oil and gas recovery rate is not significantly improved. Therefore, the temporary plugging and steering fracturing method provided by the present invention is used for secondary fracturing.

[0049]The specific construction process is as follows:

[0050]Step 1: Prepare the shear thickening liquid STF, the graphene (accounting for 1% 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 550r Add slowly and uniformly to the dispersed phase formed by mixing PEG200 and PEG400 at a mass ratio of 1:4 at a speed of 1 / min. After the addition of ink and carbon nanotubes is completed,...

Embodiment 2

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

[0059]The specific construction process is as follows:

[0060]Step 1: Prepare the shear thickening liquid STF, the 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 Add slowly and uniformly 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 addition of ink and carbon nanotubes is completed, add nano-SiO with a particle size of 450nm2(Accounting for 45% of the total mass of the shear thickening liquid STF); at the same time, the mixture is vibrated and dispersed by ultra...

Embodiment 3

[0068]This example takes Well B64 in a tight heavy oil reservoir in the Ordos Basin as an example. Well B64 has low reservoir permeability and high oil viscosity. The effect of conventional hydraulic fracturing is not obvious after construction. Therefore, temporary plugging and fracturing technology is selected to construct complex fractures. Mesh to increase the contact area between the reservoir and the oil well.

[0069]The specific construction process is as follows:

[0070]Step 1: Prepare the shear thickening liquid STF, the 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 Add slowly and uniformly to the dispersed phase formed by mixing PEG200 and PEG400 at a mass ratio of 1:4 at a speed of 1 / min. After the addition of ink and carbon nanotubes is completed, add nano-SiO with a particle size of 80nm2(Accounting for 55% of the total mass ...

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Abstract

The invention relates to the field of petroleum engineering hydraulic fracturing, in particular to a shear thickening liquid, a modified degradable fiber based on it, a preparation method and a temporary plugging diversion fracturing method: the first step is to prepare shear thickening liquid; the second step is to modify the degradable fiber DF‑1; the third step is to set the fracturing packer and inject the hydraulic pressure to open the formation; the fourth step is to inject the sand-carrying fluid mixed with the modified degradable fiber to fill the fracture The fifth step is to inject the fiber diverting agent solution to divert the joint; the sixth step is to inject the sand-carrying liquid mixed with the modified degradable fiber into the new joint for filling, and then replace and stop the pump. The invention uses non-Newtonian fluid to modify the degradable fiber DF-1, so that the network structure formed by the fiber in the solution is more stable, and the temporary plugging ability of formation fractures is greatly enhanced; compared with the prior art, it can produce more More and deeper branch fractures can greatly improve the connectivity between old fractures, natural fractures and undeveloped reservoir areas, and are suitable for popularization in low-permeability tight reservoirs.

Description

Technical field[0001]The invention relates to the field of hydraulic fracturing in petroleum engineering, in particular to a shear thickening liquid and a modified degradable fiber based thereon, a preparation method and a temporary plugging steering 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 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 is often difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(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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