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Self-suspending proppant based on aerodynamic effect, and preparation method thereof

A proppant, self-suspension technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problem of fast settling speed, the effective support length of hydraulic fractures does not meet the design requirements, proppant migration Short distance and other problems, to achieve the effect of easy access, reduce the amount of pre-liquid, and facilitate transportation and storage

Pending Publication Date: 2020-09-11
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing methods still have the disadvantages of short migration distance of proppant in hydraulic fractures, fast settlement speed, premature sand embankment formation, effective propping length of hydraulic fractures not meeting design requirements, and inability to enter secondary and tertiary fractures in large quantities. question

Method used

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  • Self-suspending proppant based on aerodynamic effect, and preparation method thereof
  • Self-suspending proppant based on aerodynamic effect, and preparation method thereof
  • Self-suspending proppant based on aerodynamic effect, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0049] The experimental plan is as follows:

[0050] (1) Arrange the indoor experimental site according to figure 1 Each experimental device is installed as shown;

[0051] (2) Example 1-6 proppant selection diameter is 2mm, apparent density is 1.26g / cm 3 10g of rubber particles, 3.5g of silica gel glue with a viscosity of 38000mpa s for the middle viscous coating, and ammonium chloride and sodium nitrite for the outer coating material. : 1.3 ratio mixing;

[0052] (3) Pour the internal proppant from its container into a viscous paint container filled with silicone glue, and stir evenly so that the internal proppant is evenly attached to the silicone glue, and the internal proppant is evenly attached to the adhesive silica gel, and then transferred to the intermediate container , Pour chemicals from their containers into the intermediate container, and under the action of the stirrer, the surface of the internal proppant with adhesive silica gel is evenly wrapped with chemi...

Embodiment 7-12

[0062] A self-suspending proppant based on aerodynamic effect and its preparation method as described in Examples 1-6, the difference is that the rubber particles are changed to 20-40 mesh and the density is 1.8g / cm 3 The medium density ceramsite 10g, other experimental conditions are the same, the experimental results obtained through the experiment are shown in Table 2.

[0063] Table 2 The relationship between the amount of proppant coating drug and the suspension time of proppant under low pressure conditions

[0064]

[0065] The experimental results and experimental phenomena of Examples 7-12 are similar to those of Examples 1-6. When the internal proppant is medium-density ceramsite, the modified proppant can still achieve self-suspension, which shows that this modified proppant is applicable Used in laboratories and mines.

[0066] Draw according to the experimental data in embodiment 7-12 and obtain as image 3 Under normal pressure conditions shown, the relation...

Embodiment 13-15

[0069] A self-suspending proppant based on aerodynamic effect and its preparation method as described in Examples 1-12, the difference is that in Examples 13-15, it is the difference between the dosage of the proppant outer coating drug and the suspension time of the proppant under high pressure conditions. The initial temperature of the water is kept constant at 40°C, the amount of the proppant coating drug and the pressure in the visual reactor are changed, and the other experimental conditions are the same. The suspension time of the pneumatic self-suspension proppant is obtained through the experiment as shown in Table 3 Shown:

[0070] Table 3 The relationship between the dosage of proppant outer coating drug and the suspension time of proppant under high pressure condition

[0071]

[0072]

[0073] It can be seen from the experimental results that this kind of modified proppant can not only achieve self-suspension under low pressure conditions, but also can achiev...

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Abstract

The invention discloses a self-suspending proppant based on an aerodynamic effect, and a preparation method thereof. The proppant comprises an internal proppant, a middle viscous coating and an external coating material, the middle viscous coating is adhered to the internal propping agent, the external coating substance coats the outer side of the middle viscous coating, and the external coating substance is a substance which does not react or change under the conditions of normal temperature and normal pressure and generates gas which is not easily dissolved in a reservoir liquid environmentunder the temperature and pressure of a stratum. The provided pneumatic self-suspension proppant is a modified proppant with a brand-new concept. The pneumatic self-suspending proppant can generate gas on the surface of the proppant, increase the buoyancy of the proppant, and avoid the problems that the proppant is too short in horizontal migration and too high in settling speed in cracks, a formed sand levee is too early, a large amount of proppant cannot enter second-level and third-level secondary cracks, the effective supporting range is small, and the effective supporting length of hydraulic cracks cannot meet the design requirement.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, in particular to a self-suspending proppant used in hydraulic fracturing and a preparation method thereof. Background technique [0002] At present, large-scale volumetric fracturing technology has become one of the essential technical means for exploiting unconventional oil and gas reservoirs. Its main principle is to form a complex fracture network in the reservoir to obtain proppant filling fractures that are much higher than the seepage capacity of the rock matrix. channel, and then achieve the purpose of improving oil and gas seepage capacity, increasing the degree of reserve production, and obtaining greater oil and gas production capacity. [0003] During reservoir stimulation, the proppant is carried by the sand-carrying fluid through the perforation holes into the formation, but due to the limited flow rate of the sand-carrying fluid, the proppant will move forward and downwa...

Claims

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Application Information

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IPC IPC(8): C09K8/80
CPCC09K8/805
Inventor 张景臣陈凯王明星杨岩石胜男
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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