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Propping agent and method for placing same in a hydraulic fracture

A hydraulic fracturing and proppant technology, applied in the field of hydraulic fracturing and increasing flow through the formation, can solve the problems of fluid rheological properties deviating from optimal properties, long-term high-temperature stability damage, etc.

Inactive Publication Date: 2017-05-10
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the quality of the fracturing fluid can be quite sensitive to the additive concentration in such a way that the long-term high temperature stability of the downhole fluid can be compromised if the additive concentration deviates from the optimal value; the rheological properties of the fluid can deviate from the optimal properties
Another problem associated with the operation of heterogeneous proppant pack (HPP) is the washout stability of fluids carrying proppant

Method used

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  • Propping agent and method for placing same in a hydraulic fracture
  • Propping agent and method for placing same in a hydraulic fracture
  • Propping agent and method for placing same in a hydraulic fracture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The following examples illustrate the feasibility of the proposed method of coating proppants with gelling agents embedded in a water-soluble polymer matrix.

[0053] Table 1. Composition of the coated proppants in Example 1.

[0054]

[0055]

[0056] Proppant CarboPROP The components and amounts listed in Table 1 were applied in the following manner.

[0057] 1. Dissolve polyvinyl alcohol in water.

[0058] 2. Then, the polysaccharide guar gum was slowly added to the polyvinyl alcohol aqueous solution. Shake the mixture well to ensure even distribution of the guar gum in the solution.

[0059] 3. Add the obtained solution to CarboPROP The fluid and proppant are then moderately agitated in the beaker until the coating on the proppant is dry.

[0060] The resulting proppant showed good coating adhesion to the surface and a very limited amount of particles sticking to each other, suggesting potentially good flowability of the coated proppant. The quality of...

Embodiment 2

[0062] The following examples illustrate the feasibility of using gelling agent-coated proppants when added to water.

[0063] To evaluate how coated guar affects viscosity, the proppant from Example 1 was added to DI water. The coated proppant was added to the water at a concentration of 2.2 pounds of proppant per 1 gallon of fluid. The resulting fluid viscosities obtained after stirring for 5 minutes are shown in image 3 , and the results were close to a linear gel viscosity with a guar polymer loading of 17 lbs / 1,000 gallons.

[0064] It is worth mentioning that the amount of guar gum involved in the mixing can be increased or decreased in order to adjust the resulting viscosity.

Embodiment 3

[0066] The following examples illustrate the feasibility of using gelling agent-coated proppants when added to linear gels.

[0067] Proppant CarboPROP Coated in the manner described in Example 1 using the components and amounts listed in Table 2.

[0068] Table 2. Composition of proppants coated in Example 3

[0069]

[0070] After coating was complete, the resulting proppants were added to the linear gel in an amount of 30 pounds of polymer per 1,000 gallons of DI water in order to evaluate how the coated guar gum added to the fluid affected viscosity. The coated proppants were added to the water at concentrations of 3 pounds and 5 pounds of proppant per gallon of fluid. Compared to the original linear gel (WF130), 35, 40 and 50, 30 pounds of guar per 1,000 gallons of DI water, obtained from 3 and 5 pounds of proppant slurry per gallon of fluid after 5 minutes of agitation Viscosity is shown in Figure 4 middle.

[0071] Based on the mass balance of guar gum added t...

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Abstract

The invention discloses a propping agent and a method for placing the same in a hydraulic fracture. The invention relates to the extraction of fluids from underground formations by means of hydraulic fracturing. The technical aim consists in improving the non-uniform placement of a propping agent. The propping agent consists of a material in the form of particles having a base, an outer water-soluble coating and a gelling agent, said gelling agent being immersed in the water-soluble coating in such a way that it is released from the base of a particle when the water-soluble coating is dissolved or destroyed upon introduction of the propping agent into portions of a hydraulic fracturing fluid. A method for the heterogeneous placement of a propping agent in a hydraulic fracture includes pumping alternating portions of hydraulic fracturing fluid, said portions containing and not containing the aforementioned particles, into a layer which is to undergo fracturing, under a pressure which exceeds a hydraulic fracturing pressure, through a plurality of clusters of perforations in a wellbore in the layer to be fractured, where the portions of hydraulic fracturing fluid containing the particles act as supports after the hydraulic fracture closes.

Description

technical field [0001] The present disclosure relates to the production of fluids from a subterranean formation, and may be applied to stimulate flow through the formation through hydraulic fracturing. More specifically, the present disclosure relates to creating proppants with soluble coatings for use in uneven packs in hydraulic fracturing, creating materials based thereon for use as fillers in formation fracturing operations, and improving the performance of proppants in hydraulic fracturing. Hydraulic fracturing methods using inhomogeneous proppant packs. Background technique [0002] Hydraulic fracturing of subterranean formations involves, as one of several stages, adding proppants to the fracturing fluid along with various additives that change the properties of the fracturing fluid, such as crosslinkers, activators, demulsifiers, etc. In the case of the heterogeneous proppant pack (HPP) technique, the fracturing fluid consists of a sequence of alternating phases (pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80C09K8/92E21B43/267
CPCC09K8/92E21B43/267C09K8/68C09K8/685C09K8/70C09K8/88C09K8/882C09K8/885C09K8/887C09K8/90C09K2208/26C09K8/805E21B43/26
Inventor M.G.伊万诺夫A.V.梅德韦德夫S.A.纳伊杜科瓦
Owner PRAD RES & DEV LTD
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