WO2009123491A1 - Additif pour fluide de fracturation hydraulique et procédé pour son utilisation - Google Patents

Additif pour fluide de fracturation hydraulique et procédé pour son utilisation Download PDF

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Publication number
WO2009123491A1
WO2009123491A1 PCT/RU2008/000188 RU2008000188W WO2009123491A1 WO 2009123491 A1 WO2009123491 A1 WO 2009123491A1 RU 2008000188 W RU2008000188 W RU 2008000188W WO 2009123491 A1 WO2009123491 A1 WO 2009123491A1
Authority
WO
WIPO (PCT)
Prior art keywords
particle
proppant
additive
fracture
size
Prior art date
Application number
PCT/RU2008/000188
Other languages
English (en)
Inventor
Anatoly Vladimirovich Medvedev
Alexander Igorevich Titkov
Oleg Olegovich Medvedev
Original Assignee
Schlumberger Canada Limited
Services Petroliers Schlumberger
Schlumberger Holdings Limited
Schlumberger Technology B.V.
Prad Research And Development N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schlumberger Canada Limited, Services Petroliers Schlumberger, Schlumberger Holdings Limited, Schlumberger Technology B.V., Prad Research And Development N.V. filed Critical Schlumberger Canada Limited
Priority to PCT/RU2008/000188 priority Critical patent/WO2009123491A1/fr
Publication of WO2009123491A1 publication Critical patent/WO2009123491A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open

Definitions

  • This invention is used in hydraulic fracturing of subterranean formations and is more particularly a method to minimize the proppant settling rate.
  • Hydraulic fracturing is a primary tool for enhancing well productivity by placing or extending highly conductive fractures from the wellbore into the reservoir.
  • Conventional hydraulic fracturing treatment is generally considered to have several distinct stages.
  • hydraulic fracturing fluid is injected through wellbore into a subterranean formation at high rates and pressures.
  • the fracturing fluid injection rate exceeds the filtration rate into the formation producing increasing hydraulic pressure at the sandface.
  • the pressure exceeds a threshold value, the formation strata or rock cracks and fractures. Hydraulic fracture initiates and starts to propagate into the formation as injection of fracturing fluid continues.
  • proppant is admixed to fracturing fluid and transported throughout hydraulic fracture.
  • Proppant deposited in created fracture over the designed length mechanically prevents fracture from closure after injection stops.
  • the production rate of oil/gas essentially depends upon the number of the parameters, including formation permeability, hydraulic pressure in the formation, properties of the production fluid, shape of the fracture, etc.
  • the most essential parameter and the one, which can be controlled and tweaked in hydraulic fracturing is the proppant pack permeability.
  • Proppant pack permeability essentially depends upon the proppant distribution in the fracture, which in turn depends on a proppant placement. One of the most significant mechanisms, occurring during proppant placement is the proppant settling.
  • Fibers to aid in transporting, suspending and placing proppant or gravel in viscous carrier fluids otherwise having insufficient viscosity to prevent particulate settling.
  • Fibers are given that have properties optimized for proppant transport but degrade after the treatment into degradation products that do not precipitate in the presence of ions in the water such as calcium and magnesium.
  • Crosslinked polymer carrier fluids are identified that are not damaged by contaminants present in the fibers or by degradation products released by premature degradation of the fibers.
  • U.S. patent application No. 20050011648Al teaches about a method and apparatus for controlling the flowback of proppants that have been placed inside fractures of a subterranean formation.
  • the apparatus is defined by a plurality of solid balls, which comprise compressed springs that are encapsulated in a mass of fibrous material and an aqueous soluble mixture of a filler material and an adhesive.
  • the solid balls are mixed in a viscous slurry and injected into the fractures with the proppants. Over time the aqueous soluble mixture dissolves releasing the compressed springs to fill the openings of the fractures.
  • the fibrous network and expanded springs which remain, act as a filter or screen to restrict the proppants flow-back to the surface during production of the well.
  • U.S. patent No. 5908073 improved methods of propping a fracture in a subterranean zone whereby the subsequent flow-back of the proppant is prevented are provided.
  • the methods basically include the steps of placing a mixture of fibrous bundles and the proppant in the fracture while maintaining the fracture open and then allowing the fracture to close on the mixture of fibrous bundles and proppant.
  • the aim of the present invention is creation of an additive that effectively prevents proppant settling and proppant slug settling and assists proppant transport. Size at least in one of dimensions of the new additive should be comparable with the fracture width.
  • proppant or proppant slugs are suspended in a fracturing fluid for several hours, so proppant settling is an important issue.
  • the present technical solution describes a particle of additive introduced into the hydraulic fracture and the method of using the additive.
  • the particle has a two- or three-dimensional structure wherein the size of the particle at least in one direction is comparable with the fracture width.
  • the minimal additive's particle size L min is (0.5 ⁇ 5.O)-W fJ - where W & is the average hydraulic fracture width at the end of fracturing treatment and most preferably the minimal particle size L min is 1.2-W f r.
  • the coefficient is empirical.
  • the particle can change shape, hardness or adhesion to the fracture surface in time or as a result of chemical or physical processes. This provides for the better interaction of the particle surface with the walls of the hydraulic fracture being formed.
  • the particle surface should be sticky. This can be achieved using any known method, for example, by applying a sticky composition onto the surface of the additive or manufacturing the additive from a polymer having good adhesion.
  • the particle is made from an elastico-plastic material.
  • the particle can be made from, but not limited by, polyethylene, polyether or cross-linked rubber.
  • the particle is made from a polymer material. This can be a water-soluble polymer, e.g. polylactic acid, polyvinyl alcohol etc. or an oil-soluble polymer e.g.
  • the particle can also be made from a composite material e.g. ceramic-polymer composite or polyurethane foam.
  • the particle may have fractal or dendrite structure.
  • Said particles suspended in the hydraulic fracturing fluid are introduced into the hydraulic fracture.
  • the particles are added together with the proppant.
  • the preferred concentration of the particles is 0.5-50 g/1.
  • the present invention describes an additive particle that has a size at least in one of dimensions not less or large than the fracture width at the end of or during fracturing treatment.
  • the additive particle may be formed of a material which is relatively soft compared to the material of the fracture walls.
  • the additive particle may be formed from a material which is relatively elastic compared to a proppant or rock properties and can change its shape under stresses and recover the shape after the stress is released.
  • the additive particle is formed from a material which is soluble in the formation fluids or non- soluble or partially soluble.
  • the new additive particle means a structure with a size at least in one of dimensions comparable or larger than the fracture width during fracturing treatment.
  • Fig.l shows schematic representation of fiber's orientation for regular fiber-loaded proppant treatment (Fig.l a) and for new additive particles orientation (Fig.l b) at the end of a fracturing treatment.
  • the following notations are used: well 1, propped fracture 2.
  • Proppant particles are not shown.
  • a limited number of fibers are in contact with both fracture walls.
  • almost all new additive particles are in contact with both fracture walls; this physically prevents proppant from settling via wall- proppant-additive particle mechanical interactions.
  • Additive particle has a specific shape and size providing good contact with both fracture walls.
  • the additive particle has a specific shape and size providing good contact with both fracture walls at any orientation.
  • this type of additive particles forms a net through the fracture which, as a physical barrier, slows down the process of proppant settling.
  • the direct contact with both fracture walls makes this additive particle different firom conventional fibers which usually are oriented in parallel direction to fracture walls and often have no contact with both walls at the same time.
  • the new additive particle has a size at least in one of dimensions comparable with fracture width at end of fracturing treatment.
  • the end of job fracture width is a fracture width after a fracturing treatment but before fracture closure. It means that during pumping stage additive particles can have smaller size than the fracture width and change their shape and/or size with time.
  • Fig. 2 An example of the material is shown in Fig. 2
  • the material has two-dimensional structure (size X ⁇ size Y»size Z) and its smallest dimension 6 is 15 mm which is comparable with EOJ fracture width.
  • the minimal additive particle size in three- dimensional space should be comparable with the end of job fracture width.
  • Example of such material is shown in Fig.3.
  • the material has three-dimensional structure (size X ⁇ size Y ⁇ size Z) and its smallest dimension 4 is 10 mm which is comparable with End of Job fracture width. Dashed line shows the XY plane. Size 4 is in ZX plane.
  • FIG.4 Another example of the new material is shown in Fig.4.
  • the material has three-dimensional structure (sizeX—sizeY—sizeZ) and its smallest dimension 6 is 15 mm which is comparable with end of job fracture width. Dashed line shows the XY plane. Size 5 is in XY plane.
  • the settling rate of 6 ppa proppant slurry in YF 125 gel with 10 g/L of J501 fibers (average length is 12 mm) was about 0.3 m/h.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention est destinée à être utilisée dans la fracturation hydraulique de formations souterraines et concerne plus particulièrement un procédé visant à minimiser la vitesse de décantation de l’agent de soutènement. On parvient à empêcher la décantation de l’agent de soutènement et de bouchons d’agent de soutènement et à faciliter le transport de l’agent de soutènement si la taille du nouvel additif dans au moins une dimension est comparable à la largeur des fractures. Au cours du traitement de fracturation, l’agent de soutènement est suspendu dans le fluide de fracturation pendant plusieurs heures, aussi la décantation de l’agent de soutènement constitue-t-elle une question importante.
PCT/RU2008/000188 2008-03-31 2008-03-31 Additif pour fluide de fracturation hydraulique et procédé pour son utilisation WO2009123491A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/RU2008/000188 WO2009123491A1 (fr) 2008-03-31 2008-03-31 Additif pour fluide de fracturation hydraulique et procédé pour son utilisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU2008/000188 WO2009123491A1 (fr) 2008-03-31 2008-03-31 Additif pour fluide de fracturation hydraulique et procédé pour son utilisation

Publications (1)

Publication Number Publication Date
WO2009123491A1 true WO2009123491A1 (fr) 2009-10-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9896923B2 (en) 2013-05-28 2018-02-20 Schlumberger Technology Corporation Synchronizing pulses in heterogeneous fracturing placement
WO2018170312A1 (fr) * 2017-03-15 2018-09-20 Baker Hughes, A Ge Company, Llc Agents anti-sédiment d'agent de soutènement tridimensionnels compressibles

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5330005A (en) * 1993-04-05 1994-07-19 Dowell Schlumberger Incorporated Control of particulate flowback in subterranean wells
RU2185501C1 (ru) * 2001-10-08 2002-07-20 Девятов Василий Васильевич Способ разработки нефтяной залежи со стабилизацией фильтрации пропантом
US6752208B1 (en) * 2003-01-08 2004-06-22 Halliburton Energy Services, Inc. Methods of reducing proppant flowback
US20060157243A1 (en) * 2005-01-14 2006-07-20 Halliburton Energy Services, Inc. Methods for fracturing subterranean wells

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5330005A (en) * 1993-04-05 1994-07-19 Dowell Schlumberger Incorporated Control of particulate flowback in subterranean wells
RU2185501C1 (ru) * 2001-10-08 2002-07-20 Девятов Василий Васильевич Способ разработки нефтяной залежи со стабилизацией фильтрации пропантом
US6752208B1 (en) * 2003-01-08 2004-06-22 Halliburton Energy Services, Inc. Methods of reducing proppant flowback
US20060157243A1 (en) * 2005-01-14 2006-07-20 Halliburton Energy Services, Inc. Methods for fracturing subterranean wells

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9896923B2 (en) 2013-05-28 2018-02-20 Schlumberger Technology Corporation Synchronizing pulses in heterogeneous fracturing placement
WO2018170312A1 (fr) * 2017-03-15 2018-09-20 Baker Hughes, A Ge Company, Llc Agents anti-sédiment d'agent de soutènement tridimensionnels compressibles

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