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Self-suspending proppants for hydraulic fracturing

A hydraulic fracturing and proppant technology, applied in the direction of drilling composition, production fluid, wellbore/well components, etc., can solve difficult proppant delivery, affect the rheological properties of the transported slurry, and interfere with the proppant mixture Uniformity setting etc.

Inactive Publication Date: 2015-02-25
SELF SUSPENDING PROPPANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But additives can affect the rheology of the delivered slurry, making it more difficult to deliver proppant to the desired location within the fracture
In addition, the use of additives interferes with the uniform settling of the proppant mixture into the fracture site

Method used

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  • Self-suspending proppants for hydraulic fracturing
  • Self-suspending proppants for hydraulic fracturing
  • Self-suspending proppants for hydraulic fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] Example 1: Preparation of inner polymer layer

[0116] An inner polymer layer at a concentration of 100 ppm was prepared on a sand sample by adding 200 g of 30 / 70 mesh frac sand to a FlackTek Max 100 long tank; 85 g of tap water and 2 g of 1% polydiallyl were added to the sand Dimethylammonium chloride (PDAC) solution; samples were then manually shaken for approximately 5 minutes, vacuum filtered, and dried in an oven at 80°C, after which sand samples were removed from the oven and used for subsequent testing.

[0117] The 10 ppm inner polymer layer coating was formulated using the same method as described above, except that 0.2 g of a 1% PDAC solution was used.

[0118] At maximum polymer loading ("max PDAC"), the inner polymer layer was formulated using the same method as described above, except that 1 g of a 20% by weight PDAC solution was used, and after treatment, the sand was washed with excess tap water , vacuum filtered, and dried in an oven at 80°C, after wh...

Embodiment 2

[0119] Example 2: Preparation of inner polymer layer

[0120] A 100 ppm inner polymer layer was prepared on sand samples by dissolving 0.2 g of LPEI 500 in 10 g of ethanol to form a 2% ethanol solution of LPEI 500; Added to 70 g of ethanol; then 150 g of 30 / 70 mesh frac sand was added to a round bottom flask, the solvent was removed using a rotary evaporator with a 65°C water bath, and samples were then removed from the flask and used for subsequent testing.

Embodiment 3

[0121] Example 3: Preparation of Outer Polymer Layer

[0122] The outer polymer layer was coated on sand samples by mixing the sand with liquid Flopam EM533 polymer under different conditions. In one coating method, the pure polymer product is added, and in the other coating method, the polymer product is extended by dilution with hexane. For hexane dilution, in a 40 mL glass vial, add 10 g of polymer to 10 g of hexane and vortex until homogeneous. The polymer was then added to a 30 g sample of 30 / 70 mesh frac sand in a FlackTek Max 100 tank. The samples were placed in a FlackTek DAC 150 SpeedMixer at 2600 rpm for approximately 25 seconds. The samples were removed from the SpeedMixer and dried in an oven at 80°C overnight.

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Abstract

The invention encompasses a modified proppant comprising a proppant particle and a hydrogel coating, wherein the hydrogel coating localizes on the surface of the proppant particle to produce the modified proppant. The invention also encompasses formulations comprising the modified proppant as well as methods for the manufacture and methods for the use of the modified proppant.

Description

[0001] related application [0002] This application claims U.S. Provisional Application Serial No. 61 / 635,612 filed April 19, 2012, U.S. Provisional Application Serial No. 61 / 662,681 filed June 21, 2012, U.S. Provisional Application Serial No. 61 / 662,681 filed November 13, 2012 61 / 725,751 and the priority of U.S. Provisional Application Serial No. 61 / 764,792 filed February 14, 2013, the entire contents of which are incorporated herein by reference. technical field [0003] The present application generally relates to systems and methods for fracturing techniques. Background technique [0004] In the process of extracting oil and / or gas from a well, it is often necessary to stimulate the flow of hydrocarbons by hydraulic fracturing. The term "fracturing" refers to the process of pumping fluid into a well until the pressure is raised to a level sufficient to fracture the subterranean geological formation containing the embedded material. This process results in cracks and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80
CPCC09K8/805C09K8/685E21B43/267Y10S507/924Y10T428/252
Inventor R·P·马奥尼D·S·索恩M·K·赫凌K·P·金凯德R·C·波蒂利亚P·伍丝里奇
Owner SELF SUSPENDING PROPPANT
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