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US 8,011,431 B2 34 cavityorthecavitiesdecreasetherelativedraWdoWnpressure and thus reduce, substantially eliminate or eliminate co-pro ductionofsand. An embodiment of this invention provides a system for cavitating producible formations or Zones therein. The sys tem includes an aggregation, agglomeration, or conglomera tion composition and injection equipment adapted to intro duce the aggregation, agglomeration, or conglomeration composition into a producible formation or Zone therein to form a conglomerated formation to reduce or prevent forma tion cave in or collapse during subsequent treatment. The system also includes equipment to produce the formation above its critical draW doWn pressure to create a cavity or cavities around the Well bore and/or casing or liner and/or cemented casing or liner in the producible formation or Zone thereof. The system also includes equipment to produce the cavitated Well beloW its critical draW doWn pressure, Where the cavity or the cavities decrease the relative draW doWn pressureandthusreduce,substantiallyeliminateoreliminate co-productionofsand. 20 FIG. 5 depicts production of a consolidated or conglomer ated,cavitated,conglomeratedformation. DETAILED DESCRIPTION OF THE INVENTION The inventors have found that a method and system can be established to reduce, substantially eliminate or eliminate co-production of formation particulate in Weakly consoli dated, semi-consolidated or unconsolidated producible for mation or Zones thereof. The systems and methods include a treatment that permits the formation or Zones therein to be cavitated, i.e., to produce a cavity or cavities betWeen the productiontubingand/orproductionequipmentandthepro ducibleformationorZone.Afterimplementingthesesystems or methods, treated Wells produce at a higher MSFR. In certain embodiments, the method includes chemically treating the producible formation or Zone by squeeZing or forcing into the formation or Zone a chemical composition causing aggregation, agglomeration, or conglomeration of formation particulate in a producible formation or Zone. The chemicaltreatmentWillchangeaZetapotentialofthesurface of the sand particles to a Zeta potential su?icient to agglom erate the sand grains resulting in an improved consolidation of the formation. By producing the treated Well above its criticaldraWdoWnpressure,portionsoftheconglomerated formation particulate are removed creating a cavity or cavi ties in the formation or Zone. The formation is produced above its critical draW doWn pressure until a desired sand production rate is achieved or until no additional sand is removedfromtheformationorZone,i.e.,untilsandproduc tion falls beloW a desired level, Which can be Zero sand pro duction. The method includes squeeZing, injecting or pumping an aggregation, agglomeration, or conglomeration chemical compositionintoaproducibleformationorZone,Wherethe aggregation, agglomeration, or conglomeration chemical compositionisadaptedtoreduceorpreventformationcavein orcollapsebyagglomeratingtheparticlesintheformationin suchasWay thattheparticlescandetachandreattachfromthe agglomeratedformation.Afterconglomeration,theforma tion or Zone is placed on production above its critical draW doWn pressure to create a cavity or cavities surrounding the producing Well borehole or Zone, e.g., casing, liner, etc., by theco-productionofformationsandorformationparticulate untiladesired?oWrateofsandorparticulateisachieved.The methodalsoincludestheoptionalstepofsqueeZing,injecting or pumping into the cavitated formation or Zone an additional or supplemental conglomeration or consolidation chemical compositiontoenhancetheconglomerationoftheformation orZoneaftercavitationformation.Themethodalsoincludes producing the formation or Zone at a pressure beloW its criti cal draW doWn pressure. The method and system have been designed to provide the producible formation or Zones With controlledcavitationandconsolidationsuf?cienttoalloWthe formation or Zone to produce With reduced co-production of sandorother?nes,Withreducingcavinginorcollapseoccur rences. As a result of undergoing the method and system, Wells Will be able to produce at a higher MSFR. General Principles ofAggregation, Agglomeration or Con glomeration Chemical aggregation, agglomeration, or conglomeration is a formation treatment that is designed to convert Weakly consolidated, semi consolidated or unconsolidated forma tions into conglomerated formations. The treatment compo sitionisdesignedtopartiallyorcompletelycoattheparticles oftheformationchangingtheiraggregation,agglomeration orconglomerationpropensityorpotentialand/orZetapoten An embodiment of this invention provides a system for cavitating producible formations or Zones therein. The sys tem includes an aggregation, agglomeration, or conglomera tion composition and injection equipment adapted to intro ducetheaggregation,agglomeration,orconglomeration25 composition into a producible formation or Zone therein to form a conglomerated formation to reduce or prevent forma tion cave in or collapse. The system also includes equipment to produce the formation above its critical draW doWn pres suretocreateacavityorcavitiesaroundtheWellboreand/or casingorlinerand/orcementedcasingorlinerintheproduc ible formation or Zone thereof. The system also includes a secondaggregation,agglomeration,orconglomerationcom position and/or a formation consolidation composition and injectionequipmentadaptedtointroducethesecondaggre gation,agglomeration,orconglomerationcompositionand/ ortheformationconsolidationcompositionintothecavitated formation or Zone to form a further conglomerated and/or consolidated, cavitated formation or Zone. The system also includesequipmenttoproducethefurtherconglomerated40 and/or consolidated, cavitated formation or Zone beloW its critical draW doWn pressure, Where the cavity or the cavities decrease the relative draW doWn pressure and thus reduce, substantiallyeliminateoreliminateco-productionofsand. BRIEF DESCRIPTION OF THE DRAWINGS The invention can be better understood With reference to thefolloWingdetaileddescriptiontogetherWiththeappended illustrativedraWingsinWhichlikeelementsarenumberedthe same: FIG. 1A depicts injection of an aggregation, agglomera tion,orconglomerationchemicalcompositionintoaproduc ibleformation. FIG. 1B depicts a conglomerated formation. FIG.2A depictsproductionoftheconglomeratedforma tion above its critical draW doWn pressure to cavitate the producibleformationortoformcavitiessurroundingtheWell bore. FIG.2B depictsacavitated,conglomeratedformation. FIG. 3 depicts production of a cavitated, conglomerated formation. FIG.4A depictsinjectionofaconsolidationorconglom eration chemical composition into a cavitated, conglomer atedformation. FIG. 4B depicts a consolidated or conglomerated, cavi tated,conglomeratedformation. 30 35 45 50 55 60 65PDF Image | PROCESS AND SYSTEM FOR CREATING ENHANCED CAVITATION
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