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Humidity-resistant self-suspending proppants

A proppant, self-suspension technology, applied in the direction of production fluid, wellbore/well components, drilling composition, etc., can solve the problem of destroying free flow characteristics, and achieve the effect of reducing the humidity-caking problem

Inactive Publication Date: 2016-11-09
SELF SUSPENDING PROPPANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this may not represent a problem in winter northern climates, in summer, especially in the South, these polymers may absorb enough atmospheric moisture to cause them to "clump", that is, mix into large, tough, cohesive solid matter or "cake" that destroys the free-flowing properties of the product

Method used

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  • Humidity-resistant self-suspending proppants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Together with 13.5 g of commercially available anionic polyacrylamide inversion emulsion containing approximately equal amounts of high molecular weight hydrogel-forming anionic polyacrylamide copolymer, water and hydrocarbon carrier liquid, 500 g of 30 / 50 mesh sand is added to Hobart-type mixer. 1.5 g of glycerin was also added so that the weight ratio of the hydrogel-forming polymer to glycerin in the composition was about 3:1. The mixture was then stirred at the slowest speed of the mixer for 7 minutes and separated into multiple 100 g samples.

[0101] Separately, a 50% by weight solution of pMDI (polymerized methylene diphenyl diisocyanate) covalent crosslinker in toluene was prepared. 0.4 g of this pMDI / toluene mixture (representing a pMDI / polymer weight ratio of 0.22:1 and a pMDI / glycerol ratio of about 0.66:1) was added to one of the 100 g samples, stirring was continued using Speedmixer, and then dried. A second 100 g sample used as a control was prepared in exa...

Embodiment 2

[0105] Three samples each containing 100g 30 / 50 sand were added to three separate FlackTek cups. Separately, a commercially available anionic polyacrylamide inverted emulsion containing 10% by weight of glycerin and 90% by weight of an anionic polyacrylamide copolymer containing approximately the same amount of high molecular weight hydrogel-forming hydrogel, water and a hydrocarbon carrier liquid was prepared. The coating composition. The weight ratio of the hydrogel-forming polymer to glycerin in the coating composition is about 3:1.

[0106] Then 3 g of the coating composition was added to the top of each FlackTek cup, and then the containers were covered, and their contents were mixed at 800 rpm for 30 seconds.

[0107] A commercially available liquid pMDI (polymerized methylene diphenyl diisocyanate) containing an average of about 4-5 methylphenyl isocyanate groups per molecule was added to each container in different amounts. . Cover the container again and mix for 30 seco...

Embodiment 3

[0118] Another characteristic of our self-suspending proppants described in our previous application is that their hydrogel coatings disintegrate rapidly when these proppants reach their final use position downhole. This property is desirable because it releases the proppant particle substrate used to prepare these proppants so that they can form proppant packs like conventional proppants and additionally support opening up cracks and fissures in their geological formations . As described further in our previous application, by including suitable hydraulic coagulation in the hydrogel-forming polymer coating of these proppants or in the aqueous fracturing fluid in which these proppants are used, or both Glue breakers can increase the disintegration.

[0119] In order to determine whether the technology of the present invention would adversely affect our self-suspending proppant's ability to disrupt separation, the following experiments were performed.

[0120] In the same manner a...

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Abstract

A dry self-suspending proppant comprises a proppant particle substrate and a coating on the proppant particle substrate. The coating is made from a hydrogel-forming polymer and a polyol or polyamine which have been crosslinked together by means of a covalent crosslinking agent.

Description

[0001] Cross references to related applications [0002] This application claims the rights of U.S. Provisional Application 61 / 948,212, filed March 5, 2014, which disclosure is incorporated herein by reference in its entirety. technical background [0003] In our earlier application, the serial number 13 / 599,828 submitted on August 30, 2012, the serial number 13 / 838,806 submitted on March 15, 2013, and the serial number 13 / 939,965 submitted on July 11, 2013 are included. And serial number 14 / 197,596 filed on March 5, 2014, we disclosed a self-suspending proppant in the form of a proppant particle substrate carrying a coating of a hydrogel-forming polymer. As described further there, these proppants are formulated in such a way that they quickly swell when in contact with aqueous fracturing fluids to form a hydrogel coating that is large enough to Their downhole transportation significantly increases the buoyancy of these proppants, but they are long-lasting enough to keep the mass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
CPCC09K8/805
Inventor D·S·索恩R·P·马奥尼M·K·赫尔灵K·P·金凯德P·乌斯里驰
Owner SELF SUSPENDING PROPPANT
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