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Ultra-light film-coated proppant and preparation method thereof

A proppant and ultra-light technology, applied in chemical instruments and methods, earthwork drilling, mining fluids, etc., can solve the problems of reduced conductivity of rock formation cracks, high brittleness of phenolic resin coating, uneven laying process, etc. , to achieve the effects of good preparation process controllability, uniform laying process and good convergence

Inactive Publication Date: 2018-05-15
CHONGQING CHANGJIANG RIVER MOLDING MATERIAL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing resin-coated proppants also have the following defects: 1. The phenolic resin coating is brittle. Compared with epoxy resin and silicone resin, the phenolic resin coating has a higher breakage rate under the same closing pressure. Multi-layer resin coating or increasing the amount of resin to improve the compressive strength will increase the thickness of the resin mold accordingly, thereby affecting the conductivity; 2. Due to the very complicated downhole environment, the surface of the proppant coated with ordinary phenolic resin will be affected. The erosion of oil, gas, water, salt water, steam, acid-base corrosion liquid, microorganisms, etc. in the rock formation will cause corrosion, degradation, and shedding of the coating layer, which will greatly reduce the conductivity of the rock formation cracks; 3. Use epoxy resin , silicone resin and other resin-coated proppants, the cost of raw materials and processes is relatively high; 4, the existing resin-coated proppant volume density (proppant mass per unit bulk volume) and apparent density (proppant mass per unit particle volume) The quality of proppant) is relatively high, resulting in the resin-coated proppant can only be transported for a short distance in the fracture, and the laying process is not uniform, and the settlement is fast, which reduces the oil and gas recovery, especially when it is used in the fracturing development of shale gas. The decline in oil and gas production is most pronounced

Method used

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  • Ultra-light film-coated proppant and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Heat 100kg of aggregate to 350°C; wherein the aggregate is one or more of ceramsite, quartz sand or walnut shell, ceramsite is preferred in this embodiment, the particle size of ceramsite is preferably 40 / 70 mesh, and the volume The density is preferably 1.3g / cm 3 , the apparent density is preferably 2.65g / cm 3 .

[0027] 2) Add 20kg of special resin, stir and coat with the aggregate, then add 10kg of curing agent and 6kg of accelerator, stir and mix evenly, and then cure.

[0028] The production method of the special resin is as follows: heat the resin and sub-nanometer inorganic materials to 200 ° C, and mix for 10 minutes; the resin includes phenolic resin, epoxy resin and silicone resin, and phenolic resin, epoxy resin, silicone resin and sub-nanometer The masses of the inorganic materials are 5kg, 6.25kg, 6.25kg, and 2.5kg, respectively. The sub-nanometer inorganic material is one or more of silica micropowder, nano-silicon micropowder, nano-alumina powder, g...

Embodiment 2

[0035] 1) After heating 100kg of aggregate to 130°C; the aggregate is preferably ceramsite, the particle size of ceramsite is preferably 40 / 70 mesh, and the bulk density is preferably 1.3g / cm 3 , the apparent density is preferably 2.65g / cm 3 .

[0036] 2) Add 1kg of special resin, stir and coat with the aggregate, then add 0.003kg of curing agent and 0.001kg of accelerator, stir and mix, and then cure.

[0037] The production method of the special resin is as follows: heat the resin and the sub-nanometer inorganic material to 80°C, and mix for 1 minute; the resin includes phenolic resin, epoxy resin and silicone resin, and the phenolic resin, epoxy resin, silicone resin and sub-nanometer The masses of the inorganic materials are 0.2kg, 0.4kg, 0.3kg, and 0.1kg, respectively. The sub-nanometer inorganic material is one or more of silicon micropowder, nano-silicon micropowder, nano-alumina powder, glass microspheres, fly ash, and floating pearl powder, and the particle size of ...

Embodiment 3

[0044] 1) Heat 100kg of aggregate to 300°C; the aggregate is preferably ceramsite, the particle size of ceramsite is preferably 40 / 70 mesh, and the bulk density is preferably 1.3g / cm 3 , the apparent density is preferably 2.65g / cm 3 .

[0045] 2) Add 4.5kg of special resin, stir and coat with the aggregate, then add 2.0kg of curing agent and 0.8kg of accelerator, stir and mix, and then cure.

[0046] The production method of the special resin is: heat the resin and sub-nanometer inorganic materials to 100°C, and mix for 5 minutes; the resin includes phenolic resin, epoxy resin and silicone resin, and phenolic resin, epoxy resin, silicone resin and sub-nanometer The masses of the inorganic materials are 1kg, 1.5kg, 1.5kg, and 0.5kg, respectively. The sub-nanometer inorganic material is one or more of silicon micropowder, nano-silicon micropowder, nano-alumina powder, glass microspheres, fly ash, and floating pearl powder, and the particle size of the sub-nano inorganic materi...

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Abstract

The invention relates to the technical field of fracturing mining of petroleum, natural gas and shale gas, in particular to an ultra-light film-coated proppant. The ultra-light film-coated proppant comprises aggregate, special resin, a curing agent, an accelerant and a dispersing agent, and the special resin includes resin and subnanometer inorganic materials. The invention further discloses a preparation method of the ultra-light film-coated proppant. The preparation method includes: 1), heating the aggregate into 130-350 DEG C; 2), adding the special resin to enable the special resin to be evenly stirred and coated with the aggregate, and then adding the curing agent and the accelerant for even stirring for curing; 3), adding the dispersing agent with even stirring till the material is dispersed into single particles; 4), performing cooling, crushing and sieving to obtain the film-coated proppant. The film-coated proppant obtained is small in volume density and apparent density, capable of being delivered remotely, uniform in pavement and favorable for improving oil and gas mining quantity.

Description

technical field [0001] The invention relates to the technical field of oil, natural gas and shale gas fracturing, in particular to an ultra-light film-coated proppant and a preparation method thereof. Background technique [0002] Hydraulic fracturing is the use of surface high-pressure pumps to squeeze fracturing fluid with high viscosity into the oil layer through the wellbore. When the rate of injection of fracturing fluid exceeds the absorption capacity of the oil layer, a very high pressure will be formed on the oil layer at the bottom of the well. When this pressure exceeds the fracture pressure of the oil layer near the bottom of the well, the oil layer will be pushed open and fractures will be generated. At this time, if the fracturing fluid is continuously squeezed into the oil layer, the fracture will continue to expand into the oil layer. In order to keep the fractures opened, the sand-carrying fluid with proppant particles is squeezed into the oil layer. After t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/12C04B26/14C04B26/32C09K8/80C04B111/40
CPCC04B26/122C04B26/14C04B26/32C04B2111/40C04B2201/20C09K8/805C04B18/027C04B24/281C04B24/302C04B14/062C04B24/121C04B24/128C04B22/064C04B24/085
Inventor 熊鹰姚云王正力蒙传幼沈雅婷
Owner CHONGQING CHANGJIANG RIVER MOLDING MATERIAL GRP
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