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A method of realizing high-speed channels through self-aggregating proppants

A technology of proppant and channel, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of reduced fluid conductivity at the end of the fracture, reduced oil well production, damaged channel fracturing, etc., to achieve High conductivity, realize self-cleaning, reduce flowback and reduce cracks

Active Publication Date: 2021-01-08
青岛大地新能源技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In previous constructions, unbreakable proppants with good permeability were used as trailing fillers, but for channel fracturing, this most critical last step has destroyed the entire channel fracturing technology, because channel fracturing technology It is hoped to realize a channel with high conductivity in the formation, and in the process of channel fracturing, in order to make the proppant group have a better clustering effect, it is necessary not only to add fibers, but also to configure a higher viscosity fracturing fluid. In this way, the higher viscosity fracturing fluid will have a certain impact on the flowback. In the position away from the fracture opening, due to the formation of a high-speed channel, the flowback of the fracturing fluid is relatively smooth, but when the fracturing fluid reaches the fracture At the orifice end, due to the influence of the proppant placed in a sealed manner, the flowback effect will be poor, and at the same time, the phenomenon of proppant backflow will occur, which will greatly reduce the flow conductivity at the orifice end
In addition, the reflowed proppant stays in the wellbore to cover the holes, and some proppant will be carried to the ground, corroding the oil nozzle and other equipment, reducing the production of the oil well, and increasing the frequency of operations such as sand washing at the bottom of the well
Therefore, the use of traditional proppants as trailing proppants for channel fracturing not only fails to achieve the original purpose, but will destroy the overall channel fracturing technology

Method used

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Examples

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Embodiment 1

[0039] A method for realizing high-speed channels through self-aggregating proppants, the method comprising:

[0040] The channel fracturing technology works normally in the early stage. In the tail-chasing stage: the self-aggregating proppant is continuously pumped into the opening of the fracture. Seam;

[0041] At the same time, since the self-aggregating proppant self-agglomerates to form a high-conductivity channel, the high-viscosity fracturing fluid is flowed back;

[0042] At the same time, affected by the fracture closure stress, some proppants will be broken to form silt; during the crushing process of the self-aggregated proppant, the free polar groups in the self-aggregated proppant make the adjacent particles Interaction between them, coupled with the gravitational effect caused by the potential change, the particles aggregate again, and the surface coating layer of the aggregated particles is re-crosslinked.

[0043] The method of the tail chase phase includes:...

Embodiment 2

[0051] A method for realizing high-speed channels through self-aggregating proppants as described in Example 1, wherein the polymer is a water-based surface modification agent ASMA (Aqueous-based Surface-Modification Agent). For sandstone reservoirs, the autopolymer is a water-based surface modification agent ASMA (Aqueous-based Surface-Modification Agent). For sandstone reservoirs, it is recommended to use water-based surface modifier ASMA (Aqueous-based Surface-Modification Agent). This type of water-based agent indicates that the modifier is not completely solidified after being injected into the formation, and maintains good viscosity, and has a better effect in sandstone. for highlighting.

Embodiment 3

[0053] A method for realizing high-speed channels through a self-polymerizing proppant as described in Example 1, wherein the polymer is polyamide resin. For low and medium permeability reservoirs, polyamide resin is used to modify the proppant coating; preferably, the mass ratio of proppant to polyamide resin is 100:3-100:6.

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Abstract

The invention provides a method for achieving a high-speed channel through a self-accumulating propping agent. By means of the material of the self-accumulating propping agent, a channel fracturing technology is completely implemented from the seam end to a seam opening, and a real channel fracturing technology is formed. According to the method, the advantages of the self-accumulating propping agent are achieved, the defects of traditional channel fracturing improvement are overcome, the effect that a high-flow conductivity channel is formed through channel fracturing is achieved better, theseam opening is supported, and the flow conductivity is improved, backflow of the propping agent is reduced; and silt is gathered and concreted in a two-time aggregation manner, new propping agent masses are formed, construction is easy and convenient, and a new output-growing technology guided by the self-accumulating propping agent is formed.

Description

technical field [0001] The invention relates to a method for realizing a high-speed channel through a self-polymerizing proppant, and belongs to the technical field of hydraulic fracturing reconstruction of low-permeability oil and gas reservoirs. Background technique [0002] With the large-scale use of channel fracturing technology, such as the fracturing technology described in Chinese patent CN103306659B to achieve ultra-high conductivity in unconventional reservoirs such as shale gas reservoirs and low-permeability oil and gas reservoirs, many new materials and technologies It has gradually been promoted and applied on the construction site. [0003] Channel fracturing breaks the limitation of conventional fracturing that the proppant particles contact each other and the fluid flow is limited to the pores between the proppant particles. The capability is increased by several orders of magnitude. [0004] In the Chinese patent CN107387053A, it is proposed that the real...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267E21B43/26C09K8/80
CPCC09K8/80E21B43/26E21B43/267
Inventor 李欣阳孙洪雯温庆志张东晓牟绍艳
Owner 青岛大地新能源技术研究院
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