US20040129923A1 - Tracking of particulate flowback in subterranean wells - Google Patents

Tracking of particulate flowback in subterranean wells Download PDF

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US20040129923A1
US20040129923A1 US10741557 US74155703A US2004129923A1 US 20040129923 A1 US20040129923 A1 US 20040129923A1 US 10741557 US10741557 US 10741557 US 74155703 A US74155703 A US 74155703A US 2004129923 A1 US2004129923 A1 US 2004129923A1
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metal
acid
selected
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composition according
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Philip Nguyen
Jimmie Weaver
Johnny Barton
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Nguyen Philip D.
Weaver Jimmie D.
Barton Johnny A.
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; MISCELLANEOUS COMPOSITIONS; MISCELLANEOUS APPLICATIONS OF MATERIALS
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60Compositions for stimulating production by acting on the underground formation
    • C09K8/80Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
    • C09K8/805Coated proppants
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/10Locating fluid leaks, intrusions or movements
    • E21B47/1015Locating fluid leaks, intrusions or movements using tracers: using radioactivity
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S507/00Earth boring, well treating, and oil field chemistry
    • Y10S507/907Indicating means, e.g. dye, fluorescing agent
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S507/00Earth boring, well treating, and oil field chemistry
    • Y10S507/922Fracture fluid
    • Y10S507/924Fracture fluid with specified propping feature

Abstract

Composition and methods for tracking the transport of particulate solids during the production of hydrocarbons from a subterrenean formation.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This application is a divisional of application Ser. No. 10/125,171 filed on Apr. 18, 2002.[0001]
  • BACKGROUND
  • The present embodiment relates generally to the recovery of hydrocarbons from a subterranean formation penetrated by a well bore and more particularly to non-radioactive compositions and methods of utilizing the non-radioactive compositions for tracking the transport of particulate solids during the production of hydrocarbons from a subterranean formation penetrated by a well bore. [0002]
  • Transport of particulate solids during the production of hydrocarbons from a subterranean formation penetrated by a well bore is a continuing problem. The transported solids can erode or cause significant wear in the hydrocarbon production equipment used in the recovery process. The solids also can clog or plug the well bore thereby limiting or completely stopping fluid production. Further, the transported particulates must be separated from the recovered hydrocarbons adding further expense to the processing. The particulates which are available for transport may be present due to an unconsolidated nature of a subterranean formation and/or as a result of well treatments placing particulates in a well bore or formation, such as, by gravel packing or propped fracturing. [0003]
  • In the treatment of subterranean formations, it is common to place particulate materials as a filter medium and/or a proppant in the near well bore area and in fractures extending outwardly from the well bore. In fracturing operations, proppant is carried into fractures created when hydraulic pressure is applied to these subterranean rock formations to a point where fractures are developed. Proppant suspended in a viscosified fracturing fluid is carried outwardly away from the well bore within the fractures as they are created and extended with continued pumping. Upon release of pumping pressure, the proppant materials remain in the fractures holding the separated rock faces in an open position forming a channel for flow of formation fluids back to the well bore. [0004]
  • Proppant flowback is the transport of proppants back into the well bore with the production of formation fluids following fracturing. This undesirable result causes undue wear on production equipment, the need for separation of solids from the produced hydrocarbons and occasionally also decreases the efficiency of the fracturing operation since the proppant does not remain within the fracture and may limit the width or conductivity of the created flow channel. Current techniques for controlling the flowback of proppants include coating the proppants with curable resin, or blending the proppants with fibrous materials, tackifying agents or deformable particulates (See e.g. U.S. Pat. No. 6,328,105 to Betzold, U.S. Pat. No. 6,172,011 to Card et al. and U.S. Pat. No. 6,047,772 to Weaver et al.) For a multi-zone well that has been fractured with proppant and is plagued with proppant flowback problems, it is quite difficult to identify the zone from which the proppant is emanating unless the proppant is tagged with a tracer. Radioactive materials have been commonly used in the logging or tagging of sand or proppant placement, however, such radioactive materials are hazardous to the environment and the techniques for utilizing such radioactive materials are complex, expensive and time consuming. Therefore, there is a need for simple compositions and methods for tracking the flowback of proppant in subterranean wells to avoid the above problems. [0005]
  • DETAILED DESCRIPTION
  • According to one embodiment, metals are tagged onto proppant material or materials to be blended with proppant material to provide for the ready identification of flowback proppant from different stages or zones of the well. Suitable metals for this purpose may be selected from Groups I to VIII of the Periodic Table of the elements as well as the lanthanum series rare earth metals so long as the metals do not constitute a component of the proppant, the fracturing fluid or the reservoir fluid and so long as the metals are compatible with the fracturing fluid. Preferred metals include gold, silver, copper, aluminum, barium, beryllium, cadmium, cobalt, chromium, iron, lithium, magnesium, manganese, molybdenum, nickel, phosphorus, lead, titanium, vanadium and zinc as well as derivatives thereof including oxides, phosphates, sulfates, carbonates and salts thereof so long as such derivatives are only slightly soluble in water so that they remain intact during transport with the proppant from the surface into the fractures. Particularly preferred metals include copper, nickel, zinc, cadmium, magnesium and barium. The metal acts as a tracer material and a different metal is tagged onto the proppant, or onto the materials to be blended with the proppant, so that each proppant stage or each fracturing job treatment can be identified by a unique tracer material. Suitable metals for use as the tracer material are generally commercially available from Sigma-Aldrich, Inc. as well as from Mallinckrodt Baker, Inc. It is understood, however, that field grade materials may also be used as suitable tracer materials for tagging onto proppant material or materials to be blended with proppant material. [0006]
  • Samples of flowback proppant collected from the field may be analyzed according to a process known as the inductively-coupled plasma (ICP) method to determine from which proppant stage and which production zone the proppant has been produced. According to the ICP method, an aqueous sample is nebulized within an ICP spectrophotometer and the resulting aerosol is transported to an argon plasma torch located within the ICP spectrophotometer. The ICP spectrophotomer measures the intensities of element-specific atomic emissions produced when the solution components enter the high-temperature plasma. An on-board computer within the ICP spectrophotomer accesses a standard calibration curve to translate the measured intensities into elemental concentrations. ICP spectrophotometers for use according to the ICP method are generally commercially available from the Thermo ARL business unit of Thermo Electron Corporation, Agilent Technologies and several other companies. Depending upon the model and the manufacturer, the degree of sensitivity of currently commercially available ICP spectrometers can generally detect levels as low as 1 to 5 parts per million for most of the metals listed above. [0007]
  • It is understood that depending on the materials used as tagging agents, other spectroscopic techniques well known to those skilled in the art, including atomic absorption spectroscopy, X-ray fluorescence spectroscopy, or neutron activation analysis, can be utilized to identify these materials. [0008]
  • According to another embodiment, an oil-soluble or oil-dispersible tracer comprising a metal salt, metal oxide, metal sulfate, metal phosphate or a metal salt of an organic acid can be used to tag the proppant by intimately mixing the metal with a curable resin prior to coating the curable resin onto the proppant. Preferably, the metal is selected from the Group VIB metals, the Group VIIB metals, and the lanthanum series rare earth metals. Specifically, the metal according to this embodiment may be chromium, molybdenum, tungsten, manganese, technetium, rhenium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium. It is preferred that the metals according to this embodiment, do not constitute a component of the proppant, the fracturing fluid or the reservoir fluid, and that the metals are compatible with the fracturing fluid. Preferably, the organic acid is a substituted or unsubstituted carboxylic acid. More preferably, the organic acid may be selected from alkanoic and alkenoic carboxylic acids, polyunsaturated aliphatic monocarboxylic acids and aromatic carboxylic acids. Most preferably, the alkanoic carboxylic acids have from 5 to 35 carbon atoms, the alkenoic carboxylic acids have from 5 to 30 carbon atoms, the polyunsaturated aliphatic monocarboxylic acids may be selected from the group of sorbic, linoleic, linolenic, and eleostearic acids and the aromatic acids may be selected from the group of benzoic, salicylic, cinnamic and gallic acids. Suitable organic acids are generally commercially available from Sigma-Aldrich, Inc. as well as from Mallinckrodt Baker, Inc. [0009]
  • For proppant to be coated with a curable resin, the tracer agent is blended homogeneously with the resin mixture and the resin is then coated onto the proppant. The proppant can be pre-coated as in the case of curable resin-coated proppants, for example, such as those commercially available from Santrol or Acme Borden, or it can be coated on-the-fly during the fracturing job treatment. The nature of the resin materials and the processes for performing the coating process is well know to those skilled in the art, as represented by U.S. Pat. No. 5,609,207 to Dewprashad et al., the entire disclosure of which is hereby incorporated herein by reference. Also, it is understood that materials to be blended with proppant such as the fibrous materials, tackifying agents or deformable beads disclosed in U.S. Pat. No. 6,328,105 to Betzold, U.S. Pat. No. 6,172,011 to Card et al. and U.S. Pat. No. 6,047,772 to Weaver et al., the entire disclosures of which are hereby incorporated by reference, can be similarly treated with a tracer agent. [0010]
  • According to still another embodiment, the metal elements or their derivative compounds can be tagged as part of the manufacturing process of proppant. As a result, the proppant is tagged with a permanent tracer. [0011]
  • According to yet another embodiment, the proppant can be coated with phosphorescent, fluorescent, or photoluminescent pigments, such as those disclosed in U.S. Pat. No.6,123,871 to Carroll, U.S. Pat. No.5,498,280 to Fistner et al. and U.S. Pat. No. 6,074,739 to Katagiri, the entire disclosures of which are hereby incorporated herein by reference. According to this embodiment, the phosphorescent, fluorescent, or photoluminescent pigments may be prepared from materials well known to those skilled in the art including but not limited to alkaline earth aluminates activated by rare earth ions, zinc sulfide phosphors, aluminate phosphors, zinc silicate phosphors, zinc sulfide cadmium phosphors, strontium sulfide phosphors, calcium tungstate phosphors and calcium sulfide phosphors. Suitable phosphorescent, fluorescent and photoluminescent materials are commercially available from Keystone Aniline Corporation (TB Series) and Capricorn Chemicals (H Series and S Series Glowbug Specialty Pigments). The particular structure of the materials has a strong capacity to absorb and store visible light such as sunlight or light from artificial lighting. After absorbing a variety of such common visible light the phosphorescent, fluorescent, or photoluminescent materials will glow in the dark. Various pigment colors can be combined with the luminescent capability of the materials to enhance the differentiation of the stages or zones. According to this embodiment, micron sized particles of the phosphorescent, fluorescent, or photoluminescent materials are intimately mixed with a resin to be coated onto a proppant to be used in a fracturing treatment. [0012]
  • According to still another embodiment, proppant materials having a naturally dark color can be dyed or coated with a marker material having a bright, vivid and intense color which marker material may be selected from oil soluble dyes, oil dispersible dyes or oil dispersible pigments. Suitable oil soluble dyes, oil dispersible dyes and oil dispersible pigments are well known to those skilled in the art and are generally commercially available from Keystone Aniline Corporation and Abbey Color. According to this embodiment, proppant materials having a dark color, such as bauxite proppant which is naturally black in color, are dyed or coated with such marker materials. In this regard, reference is made to the dyes disclosed in U.S. Pat. No. 6,210,471 to Craig, the entire disclosure of which is hereby incorporated herein by reference. [0013]
  • According to all of the above-described embodiments, the proppant material may comprise substantially any substrate material that does not undesirably chemically interact with other components used in treating the subterranean formation. It is understood that the proppant material may comprise sand, ceramics, glass, sintered bauxite, resin coated sand, resin beads, metal beads and the like. [0014]
  • The following examples are illustrative of the methods and compositions discussed above.[0015]
  • EXAMPLE 1
  • A total of three separate hydraulic fracturing treatments were performed in a subterranean formation penetrated by a well bore. For each fracturing treatment, sufficient metal tracer was added to a liquid hardenable resin to provide an initial concentration of 1000 ppm of the metal tracer in the resin treated proppant. Cuprous oxide, manganese oxide, and zinc oxide were used as tagging agents in fracturing treatments 1, 2, and 3, respectively. Samples of flowback proppant were collected during the flow back of the well. Each proppant sample was weighted and digested in concentrated nitric acid before being measured against known, calibrated metal concentrations according to the Inductive Coupled Plasma (ICP) method for the ARL Model 3410 ICP which is commercially available from the Thermo ARL business unit of Thermo Electron Corporation. Table 1 shows the concentrations of each metal obtained in each proppant flowback sample. The data indicated that the highest concentration of flowback proppant was produced from the interval of the well that was fractured in the second fracturing treatment. [0016]
    TABLE 1
    Sample Frac Treatment 1 Frac Treatment 2 Frac Treatment 3
    Number Cu (ppm) Mn (ppm) Zn (ppm)
    1 1.9 217.3 11.5
    2 2 219.2 11.8
    3 2.8 120.5 9.1
    4 3.1 204.1 12
    5 670.6 382 24.1
    6 51.6 214.1 15.3
    7 7.3 234.5 13.3
    8 2.7 437.7 17.1
    9 2.3 183.8 11.9
    10 2.7 220.2 12.8
    11 2.9 465 19.3
    12 2.1 408.1 17.4
    13 2.7 577.2 19.3
    14 3.1 410.2 18.2
    15 2.3 342.9 40.2
    16 2.1 299.8 14.9
    17 6.5 296.8 12.5
    18 2.1 494.8 18
    19 51 385.8 16.5
    20 2.7 443.8 17
    21 2.8 564.8 44.6
    22 35.5 551.8 16.1
    23 2.4 545.8 23.3
    24 2 538.8 14.7
    25 181 342.8 16.6
    26 1.5 119.8 10.3
    27 1.4 34.8 11.9
    28 1.9 204.8 43.2
    29 2 240.8 13.7
    30 2.4 175.8 11.3
    31 7.5 171.8 10.9
    32 2.3 57.8 7.7
    33 5.8 192.8 17
    34 1.7 188.8 12.1
    35 1.9 115.8 9.6
    36 2.1 168.9 11.1
    37 1.6 245.3 13
    38 1.7 173.9 11.6
    39 1.9 219.4 12.9
    40 1.9 224.6 12.6
    41 2 383.3 17.1
    42 1.7 284.7 12.5
    43 1.9 270.6 13.4
    44 2.4 311 12.7
    45 1.9 177.1 10.3
    46 1.8 304.2 12.9
    47 2.4 343.2 13.3
    48 2 308.2 12.6
    49 5.4 241.6 11.2
    50 3.4 209.1 11.4
    51 3.3 217.1 11.1
    52 1.9 299.7 12.7
    53 2.3 228.6 11.4
    54 1.5 162.8 10.1
  • EXAMPLE 2
  • A total of five separate hydraulic fracturing treatments were performed in a subterranean formation penetrated by a well bore. For each fracturing treatment, sufficient metal tracer was added to the liquid hardenable resin to provide an initial concentration of 1000 ppm of the metal tracer in the resin treated proppant. Manganese oxide, cuprous oxide, zinc oxide, magnesium oxide, and barium oxide were used as tagging agents in fracturing treatments 1 through 5, respectively. Samples of flowback proppant were collected during the flow back of the well. Each proppant sample was weighted and digested in concentrated nitric acid before being measured against known, calibrated metal concentrations according to the Inductive Coupled Plasma (ICP) method for the ARL Model 3410 ICP which is commercially available from the Thermo ARL business unit of Thermo Electron Corporation. Table 2 shows the concentrations of each metal obtained in each proppant flowback sample. The data indicated that the highest concentration of flowback proppant was produced from the intervals of the well that were fractured in fracturing treatments 1 and 5. [0017]
    TABLE 2
    Frac Frac Frac Frac Frac
    Treat- Treat- Treat- Treat- Treat-
    Sample ment 1 ment 2 ment 3 ment 4 ment 5
    Number Mn (ppm) Cu (ppm) Zn (ppm) Mg (ppm) Ba (ppm)
    1 256.9 7.3 18.2 26.8 106.2
    2 210.3 14.5 23.1 24 110.6
    3 164.5 12.4 20.2 22.5 94.8
    4 236.5 9.1 19.9 23.3 100.4
    5 97.8 10.5 14.7 19 105.7
    6 288.9 2.8 15.8 25.4 110.4
    7 202.8 172.8 12.1 21.3 99.7
    8 221.3 3 12.8 22.3 115.9
    9 167.9 2.9 12.5 21.8 115.7
    10 236.1 2.2 12.5 22.8 90.7
    11 162.6 1.6 10.8 19.5 85.9
    12 111.8 1.6 8.9 18.8 74.9
    13 231.8 1.7 11.5 21.7 86.7
    14 246.9 2.5 13.1 24.4 98.3
    15 348.2 2 13.5 26.8 112.8
    16 273.5 2.4 12.4 24.4 101
    17 221.5 2 11.4 29.3 83.8
    18 268 1.4 11.9 25.8 88.4
    19 177.8 1.8 10.4 22.3 77.8
    20 247.5 2.4 11.3 28 92.2
    21 132.8 1.8 10 22.2 72.4
    22 165.8 2.3 9.4 20.9 75.3
    23 306.9 66.4 11.9 28.7 103.8
    24 205.7 1.6 9.4 23 87.1
    25 241.2 2.6 10.6 23.4 90.4
    26 197.6 2.2 10.1 24.1 88
    27 242 2.3 10.7 26.2 98.9
    28 202.8 3 10.8 24.6 94.6
    29 165.7 2 9 20.7 85.5
    30 138.3 1.4 8.7 21.3 76.1
    31 227.4 1.5 10.3 24 92.8
    32 192.1 1.7 9.8 23.5 86.6
    33 201.9 1.2 9.6 22.3 86.4
    34 138.4 1.7 8.6 19.8 73.9
  • Variations and Equivalents
  • Although only a few exemplary embodiments have been described in detail above, those skilled in the art will readily appreciate that many other modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages described herein. Accordingly, all such modifications are intended to be included within the scope of the following claims. [0018]

Claims (12)

    What is claimed is:
  1. 1. A traceable proppant composition for treating a subterranean formation having multiple zones penetrated by a well bore comprising:
    a particulate material; and
    a tracking material, wherein the tracking material is selected from the group consisting of metals, metal salts of organic acids, phosphorescent pigments, fluorescent pigments, photoluminescent pigments, oil soluble dyes, oil dispersible dyes and oil dispersible pigments.
  2. 2. A proppant composition according to claim 1, wherein the tracking material comprises a metal selected from Groups I to VIII of the Periodic Table of the elements and the lanthanum series rare earth metals;
    provided that the metal is not a component of the particulate material; and
    provided that the metal is compatible with the fluids disposed within the well bore.
  3. 3. A proppant composition according to claim 1, wherein the tracking material comprises a metal selected from the group consisting of gold, silver, copper, aluminum, barium, beryllium, cadmium, cobalt, chromium, iron, lithium, magnesium, manganese, molybdenum, nickel, phosphorus, lead, titanium, vanadium, zinc and oxide, phosphate, sulfate, carbonate and salt derivatives thereof.
  4. 4. A traceable proppant composition according to claim 3, wherein the tracking material comprises a metal oxide selected from the group consisting of copper, nickel, zinc, magnesium and barium.
  5. 5. A traceable proppant composition according to claim 3, wherein the tracking material comprises a metal oxide selected from the group consisting of manganese oxide, cuprous oxide, zinc oxide, magnesium oxide, and barium oxide.
  6. 6. A traceable proppant composition according to claim 1, wherein the tracking material is selected from the group consisting of metal salts, metal oxides, metal sulfates, metal phosphates and metal salts of organic acids and the metal is selected from the group consisting of chromium, molybdenum, tungsten, manganese, technetium, rhenium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium.
  7. 7. A traceable proppant composition according to claim 6, wherein the tracking material comprises a metal salt of an organic acid and the organic acid is selected from the group consisting of substituted and unsubstituted alkanoic carboxylic acids, alkenoic carboxylic acids, polyunsaturated aliphatic monocarboxylic acids and aromatic carboxylic acids.
  8. 8. A traceable proppant composition according to claim 7, wherein the organic acid comprises an alkanoic carboxylic acid having from 5 to 35 carbon atoms.
  9. 9. A traceable proppant composition according to claim 7, wherein the organic acid comprises an alkenoic carboxylic acid having from 5 to 30 carbon atoms.
  10. 10. A traceable proppant composition according to claim 7, wherein the organic acid comprises a polyunsaturated aliphatic monocarboxylic acid selected from the group consisting of sorbic acid, linoleic acid, linolenic acid and eleostearic acid.
  11. 11. A traceable proppant composition according to claim 7, wherein the organic acid comprises an aromatic acid selected from the group consisting of benzoic acid, salicylic acid, cinnamic acid and gallic acid.
  12. 12. A traceable proppant composition according to claim 1, wherein the tracking material is selected from the group consisting of phosphorescent pigments, fluorescent pigments and photoluminescent pigments and wherein the phosphorescent, fluorescent, and photoluminescent pigments are prepared from materials selected from the group consisting of alkaline earth aluminates activated by rare earth ions, zinc sulfide phosphors, aluminate phosphors, zinc silicate phosphors, zinc sulfide cadmium phosphors, strontium sulfide phosphors, calcium tungstate phosphors and calcium sulfide phosphors.
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WO2005100746A1 (en) * 2004-04-05 2005-10-27 Carbo Ceramics Incorporated Tagged propping agents and related methods
US20090025470A1 (en) * 2006-03-06 2009-01-29 Johnson Matthey Plc Tracer method and apparatus
US7654323B2 (en) 2005-09-21 2010-02-02 Imerys Electrofused proppant, method of manufacture, and method of use
US20100234249A1 (en) * 2005-08-09 2010-09-16 Hexion Specialty Chemicals, Inc. Methods and compositions for determination of fracture geometry in subterranean formations
US7963330B2 (en) 2004-02-10 2011-06-21 Halliburton Energy Services, Inc. Resin compositions and methods of using resin compositions to control proppant flow-back
US20120279703A1 (en) * 2011-05-03 2012-11-08 Mcdaniel Robert Ray Coated and cured proppants
US8562900B2 (en) 2006-09-01 2013-10-22 Imerys Method of manufacturing and using rod-shaped proppants and anti-flowback additives
US9518214B2 (en) 2013-03-15 2016-12-13 Preferred Technology, Llc Proppant with polyurea-type coating
US9562187B2 (en) 2012-01-23 2017-02-07 Preferred Technology, Llc Manufacture of polymer coated proppants
US9624421B2 (en) 2011-09-02 2017-04-18 Preferred Technology, Llc Dual function proppants
US9725645B2 (en) 2011-05-03 2017-08-08 Preferred Technology, Llc Proppant with composite coating
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