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Low-density coated ceramsite proppant and preparation method thereof

A low-density, proppant technology, applied in chemical instruments and methods, earthwork drilling, production fluids, etc., can solve problems such as high density, increased energy consumption and production costs, and limited reduction in proppant density

Inactive Publication Date: 2019-02-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, resin is used as the membrane material. This type of membrane material has a high density and a limited amount of addition, so the degree of reduction in the density of the obtained proppant is limited; at the same time, the above processes are carried out at high temperatures, which increases energy consumption and production costs.

Method used

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  • Low-density coated ceramsite proppant and preparation method thereof
  • Low-density coated ceramsite proppant and preparation method thereof
  • Low-density coated ceramsite proppant and preparation method thereof

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preparation example Construction

[0032] The present invention also provides a method for preparing the low-density film-coated ceramsite proppant described in the above technical solution, comprising the following steps:

[0033] (1) Active carbon is mixed with resin to obtain membrane material;

[0034] (2) under the action of a coupling agent, the membrane material is used to coat the ceramsite to obtain a coating mixture;

[0035] (3) Adding a curing agent and a lubricant in sequence to the coating mixture, and obtaining a low-density coated ceramsite proppant after complete curing.

[0036] The invention mixes activated carbon with resin to obtain membrane material. In the present invention, the mixing is preferably carried out under stirring conditions; the present invention has no special requirements on the speed and time of the stirring, as long as the activated carbon and the resin can be mixed evenly. In the present invention, the equipment used for mixing is preferably a sand mixer.

[0037] Aft...

Embodiment 1

[0044] In parts by weight, the preparation raw materials include: 100 parts of ceramsite; 4 parts of resin; 10 parts of activated carbon; 0.6 part of coupling agent; 0.2 part of curing agent; 1 part of lubricant.

[0045] Preparation method: Add 5000g of commercial ceramsite proppant with a particle size of 20-40 mesh into 10L of sulfuric acid solution with a mass concentration of 1%, soak for 2 hours, wash until neutral and set aside. Take 500g of activated carbon powder (200-400 mesh), 200g of phenolic resin, stir evenly in the sand mixer, add the treated ceramsite and 30g of coupling agent KH550, stir into balls, and then add 10g of curing agent ammonium chloride, Continue to stir, add 50g of lubricant calcium stearate before the coated ceramsite is agglomerated, and continue to stir until the membrane material is completely solidified to obtain a low-density coated ceramsite-coated proppant.

Embodiment 2

[0047] In parts by weight, the preparation raw materials include: 100 parts of ceramsite; 2 parts of resin; 10 parts of activated carbon; 1 part of coupling agent; 0.2 part of curing agent; 1 part of lubricant.

[0048] Preparation method: Add 5000g of commercial ceramsite proppant with a particle size of 20-40 mesh into 10L of sulfuric acid solution with a mass concentration of 5%, soak for 8 hours, wash until neutral and set aside. Take 500g of activated carbon powder (200-400 mesh) and 100g of phenolic resin, stir evenly in the sand mixer, add the treated ceramsite and 50g of coupling agent KH550, stir, and after the coating is uniform, add curing agent six Methylenetetramine 10g, continue to stir, add 50g of lubricant calcium stearate before the coated ceramsite is agglomerated, continue to stir until the membrane material is completely solidified, and obtain a low-density coated ceramsite-coated proppant.

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Abstract

The invention provides a low-density coated ceramsite proppant, and belongs to the technical field of hydraulic fracturing proppants. The low-density coated ceramsite proppant is prepared from the following raw materials in parts by weight: 60-100 parts of ceramsite, 0.2-10 parts of resin, 2-20 parts of activated carbon, 0.1-1 part of a coupling agent, 0.2-0.6 parts of a curing agent and 0.5-1 part of a lubricant. The activated carbon and resin are used as a film material and are applied to the surface of ceramsite under the action of the coupling agent by coating, and uniform coating and curing of the film material are achieved by cooperating with the curing agent and the lubricant; the activated carbon has rich micropores, and orifices of the activated carbon are closed by the resin material through mixing and curing with the resin. Thus, strength of the prepared coated ceramsite proppant can be ensured, certain gaps can be contained in the film material, and density is reduced; besides, the activated carbon has hydrophobic characteristic, and the hydrophobic surface of the activated carbon can reduce settling velocity of the activated carbon in fracturing fluid.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing proppants, in particular to a low-density film-coated ceramsite proppant and a preparation method thereof. Background technique [0002] Hydraulic fracturing is an effective measure for increasing production of oil and gas wells and increasing injection of water wells. During the construction process, a large amount of proppant is required to fill formation fractures. For oil and gas well reservoirs with high closure pressure, the proppant is mainly ceramsite. The relative density of ceramsite is relatively high, which requires high fracturing fluid performance and pumping conditions. [0003] At present, with the development of shale gas and the maturity of horizontal well fracturing technology, higher requirements are placed on proppant. Low-density proppant can greatly reduce the settlement of proppant in the process of fracturing fluid transmission, increase the Potential value o...

Claims

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Application Information

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IPC IPC(8): C09K8/80
CPCC09K8/86C09K8/88C09K8/887
Inventor 刘新亮张贵才尹海亮刘臻郭子棋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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