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Dust free inorganic particles and method of making same

a technology of inorganic particles and inorganic particles, which is applied in the direction of fluid removal, chemistry apparatus and processes, and wellbore/well accessories, etc., can solve the problems of short time, short time, and ineffective dust suppression of baker hughes technologies,

Inactive Publication Date: 2018-12-13
COVIA HLDG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively reduces airborne dust concentration by up to 99.9% and maintains dust suppression efficiency for at least 4 days, preventing issues like arching and caking, while maintaining the sand's free-flowing characteristics during transportation and operation.

Problems solved by technology

Lab test showed that the Baker Hughes technologies were not effective to keep the measured average dust concentration of treated materials in airborne environment less than 0.05 milligrams per cubic meters, especially, the dust suppression effectiveness is temporary and short-life with less than four days, often if at all, for not more than a day or so.
Such short time dust control is unacceptable in the hydraulic fracing field.
Without a re-drying operation, the frac sand will create operational issues such as arching, adjacent particles sticking to each other.

Method used

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  • Dust free inorganic particles and method of making same
  • Dust free inorganic particles and method of making same
  • Dust free inorganic particles and method of making same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037]Two (lbs) of regular 100 mesh frac sand from Unimin's frac sand plant was charged in the in-house dust concentration test chamber per test and dust concentration of the test sample was determined by pDR. The measured overall average dust concentration was 1.362 (mg / m3) in the 1st day, 1.487 (mg / m3) in the 4th day, and 1.02 (mg / m3) in the 8th day. This example explains the unacceptable dust levels experienced by frac sand proppants. The frac sand has “dust problems” as discussed herein.

example 2

[0038]A regular cationic polymer solution for dust suppression treatment to frac sand with a solution concentration of 0.93% was prepared in a 1000 mL beaker with a solution recipe and procedure as listed in Table 3. This is the background solution. It has the components of Table 1, items 1-4 without the discovery on the present invention, i.e. the added small amount of surfactant item 5.

[0039]To prepare for the solution chemicals, 483.8 (gram) of di-water was measured into 1000 mL of glass beaker. Then, 1.0 (gram) of sodium chloride manufactured by Morton Salts, 12.2 (g) of Floquat FL 4135 solution, a cationic polymer manufactured by SNF Inc., and 19.3 (gram) of Kem Sep C-9014, a cationic polymer, manufactured by Kemira, were blended into the 1000 mL beaker. All beakers containing the residual cationic polymer solutions were rinsed with Di-water. Finally, the total weight of the whole blended mixture was added to 1000 (gram). The obtained final solution was transferred to a 1000 mL...

example 3

[0041]A new solution was prepared by adding to the unsuccessful Example 2 cationic polymer solution a small amount of commercially available anionic surfactant Tergitol NP-7. The raw material composition of the new Example 3 solution recipe is listed in Table 4. This is an embodiment of the “new” solution defined by the chemicals and ranges of Table 1. Items 1-4 are the unsuccessful Example prior cationic polymer solution. The new added small amount of surfactant is item 5.

TABLE 4Dust Suppression Solutions Used for Treating Frac Sands (example 3)Raw Material ComponentsWt %Wt %Solution Conc. (%)Solid %Quantities (gram)1Di-waterDi-water97.84978.42NaCl (Morton Salts)NaCl (Morton Salts)0.10.11.03Floquat FL 4135Floquat FL 41351.12350.39211.24Floquat FL 4440Floquat FL 44400.93420.3919.35Tergitol NP-7Tergitol NP-70.011000.010.1Total:1000.8931000.0

[0042]Both Floquat FL 4135 and 4440 are cationic polymers and were manufactured by SNF Inc. Tergitol NP-7 is an anionic surfactant manufactured b...

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Abstract

A long term dust free mass of free flowing inorganic particles of the type creating airborne silica dust, preferably sand particles as used for hydraulic fracturing, where the particles are coated with a dust suppression solution having 0.10 to 6.0 percent by weight a soluble polymer and an added, small amount of a surfactant, which small amount is less than 0.5 and preferably less than 0.10 percent by weight of the solution. The mass has a very low dosage of the solution, in the range of 0.1 to 10 milliliters per pound of the mass, so the mass has a moisture content of less than 0.30 percent by weight.

Description

[0001]The present application is a continuation of U.S. patent application Ser. No. 15 / 091034, filed on Apr. 5, 2016, which in turn claims priority to provisional patent application Ser. No. 62 / 168,358 that was filed on May 29, 2015 (UNM-39407) and in provisional patent application Ser. No. 62 / 170,489 that was filed on Jun. 3, 2015 (UNM-39601), which are all incorporated by reference herein.[0002]The present invention relates to an improvement in a proppant, specifically frac sand, used in hydraulic fracking and more particularly to a novel proppant that is modified to be dust free for a long period of time, i.e. at least 4 days. Thus, the new proppant is a “long term dust free” proppant.INCORPORATION BY REFERENCE[0003]The invention of this application relates to a dust free proppant. U.S. Publication 2015 / 0119301 discloses on method of coating a proppant with a solution and is incorporated by reference to form a part of the specification of this application. It is hereafter referre...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K8/80
CPCC09K8/805
Inventor ZIELKE, RICHARD C.LIU, FEIPENG P.
Owner COVIA HLDG CORP