Self-suspending proppants for hydraulic fracturing

A technology of hydraulic fracturing and proppant, which is applied in the direction of drilling composition, production fluid, wellbore/well components, etc., and can solve the problem of high cost of the system

Inactive Publication Date: 2015-02-18
SELF SUSPENDING PROPPANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also desirable that such an improved system be cost effective

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

[0161] Example 1: Preparation of inner polymer layer

[0162] 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 a 1% polydiallyldimethylammonium chloride (PDAC) solution were added to the sand. The samples were then manually shaken for about 5 minutes, vacuum filtered, and dried in an oven at 80°C. Sand samples were then removed from the oven and used for subsequent testing.

[0163] The 10 ppm inner polymer layer coating was formulated using the same method as described above, except only 0.2 g of the 1% PDAC solution was used.

[0164] 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 wt. % PDAC solution was used. After treatment, the sand was washed with excess tap water, vacuum filtered, and dried in an oven at 80°C. Sand samples were then ...

Embodiment 2

[0165] Example 2: Preparation of inner polymer layer

[0166] An inner polymer layer at a concentration of 100 ppm was prepared on a sand sample by dissolving 0.2 g of LPEI 500 in 10 g of ethanol to form a 2% solution of LPEI 500 in ethanol. In a 250 mL round bottom flask, 0.75 g of 2% LPEI 500 solution was added to 70 g of ethanol. 150 g of 30 / 70 mesh frac sand was then added to the round bottom flask. Solvent was removed using a 65 °C water bath and using a rotary evaporator. Samples were then removed from the flasks and used for subsequent testing.

Embodiment 3

[0167] Example 3: Preparation of Outer Polymer Layer

[0168] An outer polymer layer was applied to sand samples by mixing the sand with liquid Flopam EM533 polymer under different conditions. In one coating method, pure polymer product is added. In another coating method, the polymer product is extended by diluting 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 about 25 seconds. The samples were removed from the speed mixer 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

technical field [0001] The present application generally relates to systems, formulations and methods for fracturing techniques. Background technique [0002] In the process of obtaining oil and / or gas from a well, it is often necessary to stimulate the flow of hydrocarbons via hydraulic fracturing. The term "fracturing" refers to the process of pumping fluid into a well until the pressure is increased to a level sufficient to fracture a subsurface geological formation containing entrapped material. This process results in cracks and fractures that destroy the underlying layer to allow hydrocarbon products to be carried to the well bore at a significantly higher rate. However, the newly formed orifice closes unless pressure is maintained. To open and maintain the pathway, a propping agent, or "proppant," is injected with the hydraulic fluid to create the support needed to maintain the orifice. When a fracture is formed, the proppant is transported in the slurry by releasi...

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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